{"id":44401,"date":"2021-06-02T08:00:31","date_gmt":"2021-06-01T23:00:31","guid":{"rendered":"https:\/\/norimen.net\/wordpress\/?p=44401"},"modified":"2026-05-17T14:39:30","modified_gmt":"2026-05-17T05:39:30","slug":"bit-hardness-various-mountains","status":"publish","type":"post","link":"https:\/\/norimen.net\/en\/bit-hardness-various-mountain\/","title":{"rendered":"Bit Hardness Varies | Choose the Right One for the Mountain"},"content":{"rendered":"

Hello, everyone.<\/p>\n

This is Enta.<\/p>\n

\"Down-the-Hole<\/p>\n

This is a bit for a down-the-hole hammer.<\/p>\n

We have drilled approximately 60 holes using this bit, which has a diameter of about 110 mm, since it was new.<\/p>\n

That's how things are right now lol<\/p>\n

\"Down-the-Hole<\/p>\n

Here's a side view.<\/p>\n

The main unit is already worn out.<\/p>\n

Sometimes this happens because of the mountain, and other times it happens because the steel is too soft.<\/p>\n

 <\/p>\n

You might be thinking, \u201cIs iron really that soft?\u201d but it actually is!<\/p>\n

There are several types of hardness tests, but we generally use one called HRC.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Steel Hardness Conversion Table<\/caption>\n
<\/td>\nRockwell Hardness (HRC)<\/span><\/th>\nVickers Hardness (HV)<\/span><\/th>\nBrinell Hardness (HB)<\/span><\/th>\nShore Hardness (HS)<\/span><\/th>\n<\/tr>\n
Soft materials<\/span><\/td>\n\u2013<\/span><\/td>\n115<\/span><\/td>\n110<\/span><\/td>\n15<\/span><\/td>\n<\/tr>\n
\u2013<\/span><\/td>\n130<\/span><\/td>\n125<\/span><\/td>\n20<\/span><\/td>\n<\/tr>\n
Medium Hardness<\/span><\/td>\n\u2013<\/span><\/td>\n170<\/span><\/td>\n160<\/span><\/td>\n25<\/span><\/td>\n<\/tr>\n
\u2013<\/span><\/td>\n210<\/span><\/td>\n200<\/span><\/td>\n30<\/span><\/td>\n<\/tr>\n
22<\/span><\/td>\n250<\/span><\/td>\n235<\/span><\/td>\n35<\/span><\/td>\n<\/tr>\n
High Hardness<\/span><\/td>\n28<\/span><\/td>\n280<\/span><\/td>\n270<\/span><\/td>\n40<\/span><\/td>\n<\/tr>\n
32<\/span><\/td>\n320<\/span><\/td>\n300<\/span><\/td>\n45<\/span><\/td>\n<\/tr>\n
37<\/span><\/td>\n360<\/span><\/td>\n340<\/span><\/td>\n50<\/span><\/td>\n<\/tr>\n
41<\/span><\/td>\n400<\/span><\/td>\n380<\/span><\/td>\n55<\/span><\/td>\n<\/tr>\n
45<\/span><\/td>\n450<\/span><\/td>\n430<\/span><\/td>\n60<\/span><\/td>\n<\/tr>\n
48<\/span><\/td>\n480<\/span><\/td>\n450<\/span><\/td>\n65<\/span><\/td>\n<\/tr>\n
Ultra-High Hardness<\/span><\/td>\n52<\/span><\/td>\n550<\/span><\/td>\n(500)<\/span><\/td>\n70<\/span><\/td>\n<\/tr>\n
56<\/span><\/td>\n615<\/span><\/td>\n\u2013<\/span><\/td>\n75<\/span><\/td>\n<\/tr>\n
59<\/span><\/td>\n680<\/span><\/td>\n\u2013<\/span><\/td>\n80<\/span><\/td>\n<\/tr>\n
62<\/span><\/td>\n740<\/span><\/td>\n\u2013<\/span><\/td>\n85<\/span><\/td>\n<\/tr>\n
65<\/span><\/td>\n820<\/span><\/td>\n\u2013<\/span><\/td>\n90<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Since I use HRC, I'll proceed with that.<\/p>\n

 <\/p>\n

Typically, the tips of drill bits are made of tungsten.<\/p>\n

This tungsten is second only to diamond in hardness.<\/p>\n

So, the hardness of tungsten is around HRC 67 to 80.<\/p>\n

 <\/p>\n

Please take another look at our Chip. \ud83d\udc46<\/p>\n

Only the tungsten is left intact, isn't it?<\/p>\n

That means the rock is harder than the bit itself but softer than tungsten.<\/p>\n

 <\/p>\n

Apparently, the hardness of this unit is HRC 45 or higher, but since it's made in China, I'm a little skeptical lol.<\/p>\n

I hear that Japanese-made bits are guaranteed to be around HRC 55, but that means they're expensive, doesn't it...<\/p>\n

 <\/p>\n

It depends on the condition of the mountain, and bits are consumables.<\/p>\n

So, do you go out of your way to find high-quality items? Or do you think that as long as something is usable to some extent, even if it\u2019s cheap, that\u2019s good enough?<\/p>\n

It really depends on the person, so I can't say for sure, but I'm going to swap out this bit\u2014this time for an American-made one\u2014and start drilling. lol<\/p>\n

 <\/p>\n

I don't know how it will turn out, but since the drilling will continue for a while, I'd like to try out a few different things.<\/p>\n

 <\/p>\n

The hardness of soil is apparently measured on the Mohs scale, with diamond at 15 being the hardest.<\/p>\n

If you look at the table below, you'll see that the HRC and New Morse ratings allow you to compare the rock and the bit.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Vickers<\/strong><\/span><\/td>\nBrinell<\/strong><\/span><\/td>\nRockwell<\/strong><\/span><\/td>\nShore<\/strong><\/span><\/td>\nOld Morse<\/strong><\/span><\/td>\nNew Morse<\/strong><\/span><\/td>\n\u4f8b<\/strong><\/span><\/td>\n<\/tr>\n
HV<\/strong><\/span><\/td>\nHB<\/strong><\/span><\/td>\nHRA<\/strong><\/span><\/td>\nHRB<\/strong><\/span><\/td>\nHRC<\/strong><\/span><\/td>\nHRD<\/strong><\/span><\/td>\nHS<\/strong><\/span><\/td>\nReference Values<\/strong><\/span><\/td>\n<\/tr>\n<\/thead>\n
\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n1<\/span><\/td>\n1<\/span><\/td>\nTalc<\/span><\/td>\n<\/tr>\n
\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n2<\/span><\/td>\n2<\/span><\/td>\nNylon<\/span><\/td>\n<\/tr>\n
100<\/span><\/td>\n100<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n3<\/span><\/td>\n3<\/span><\/td>\nPolycarbonate<\/span><\/td>\n<\/tr>\n
105<\/span><\/td>\n105<\/span><\/td>\n\u2013<\/span><\/td>\n62.3<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
117<\/span><\/td>\n111<\/span><\/td>\n\u2013<\/span><\/td>\n65.7<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n15<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
122<\/span><\/td>\n116<\/span><\/td>\n\u2013<\/span><\/td>\n67.6<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n18<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
127<\/span><\/td>\n121<\/span><\/td>\n\u2013<\/span><\/td>\n69.8<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n19<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
130<\/span><\/td>\n124<\/span><\/td>\n\u2013<\/span><\/td>\n71.2<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n20<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nCalcite<\/span><\/td>\n<\/tr>\n
132<\/span><\/td>\n126<\/span><\/td>\n\u2013<\/span><\/td>\n72.0<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n20<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
140<\/span><\/td>\n133<\/span><\/td>\n\u2013<\/span><\/td>\n75.0<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n21<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
150<\/span><\/td>\n143<\/span><\/td>\n\u2013<\/span><\/td>\n78.7<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n22<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
160<\/span><\/td>\n152<\/span><\/td>\n\u2013<\/span><\/td>\n81.7<\/span><\/td>\n0.0<\/span><\/td>\n\u2013<\/span><\/td>\n24<\/span><\/td>\n4<\/span><\/td>\n4<\/span><\/td>\nFluorite<\/span><\/td>\n<\/tr>\n
170<\/span><\/td>\n162<\/span><\/td>\n\u2013<\/span><\/td>\n85.0<\/span><\/td>\n3.0<\/span><\/td>\n\u2013<\/span><\/td>\n25<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
180<\/span><\/td>\n171<\/span><\/td>\n\u2013<\/span><\/td>\n87.1<\/span><\/td>\n6.0<\/span><\/td>\n\u2013<\/span><\/td>\n26<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
190<\/span><\/td>\n181<\/span><\/td>\n\u2013<\/span><\/td>\n89.5<\/span><\/td>\n8.5<\/span><\/td>\n\u2013<\/span><\/td>\n28<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
200<\/span><\/td>\n190<\/span><\/td>\n\u2013<\/span><\/td>\n91.5<\/span><\/td>\n11.0<\/span><\/td>\n\u2013<\/span><\/td>\n29<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nCast Iron FC25<\/span><\/td>\n<\/tr>\n
210<\/span><\/td>\n200<\/span><\/td>\n\u2013<\/span><\/td>\n93.4<\/span><\/td>\n13.4<\/span><\/td>\n\u2013<\/span><\/td>\n30<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
220<\/span><\/td>\n209<\/span><\/td>\n\u2013<\/span><\/td>\n95.0<\/span><\/td>\n15.7<\/span><\/td>\n\u2013<\/span><\/td>\n32<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
230<\/span><\/td>\n219<\/span><\/td>\n\u2013<\/span><\/td>\n96.7<\/span><\/td>\n18.0<\/span><\/td>\n\u2013<\/span><\/td>\n33<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
240<\/span><\/td>\n228<\/span><\/td>\n60.7<\/span><\/td>\n98.1<\/span><\/td>\n20.3<\/span><\/td>\n40.3<\/span><\/td>\n34<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
245<\/span><\/td>\n233<\/span><\/td>\n61.2<\/span><\/td>\n\u2013<\/span><\/td>\n21.3<\/span><\/td>\n41.1<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nS45C<\/span><\/td>\n<\/tr>\n
250<\/span><\/td>\n238<\/span><\/td>\n61.6<\/span><\/td>\n99.5<\/span><\/td>\n22.2<\/span><\/td>\n41.7<\/span><\/td>\n36<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
255<\/span><\/td>\n243<\/span><\/td>\n62.0<\/span><\/td>\n\u2013<\/span><\/td>\n23.1<\/span><\/td>\n42.2<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
260<\/span><\/td>\n247<\/span><\/td>\n62.4<\/span><\/td>\n101.0<\/span><\/td>\n24.0<\/span><\/td>\n43.1<\/span><\/td>\n37<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
265<\/span><\/td>\n252<\/span><\/td>\n62.7<\/span><\/td>\n\u2013<\/span><\/td>\n24.8<\/span><\/td>\n43.7<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
270<\/span><\/td>\n256<\/span><\/td>\n63.1<\/span><\/td>\n102.0<\/span><\/td>\n25.6<\/span><\/td>\n44.3<\/span><\/td>\n38<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
275<\/span><\/td>\n261<\/span><\/td>\n63.5<\/span><\/td>\n\u2013<\/span><\/td>\n26.4<\/span><\/td>\n44.9<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nS55C<\/span><\/td>\n<\/tr>\n
280<\/span><\/td>\n265<\/span><\/td>\n63.8<\/span><\/td>\n103.5<\/span><\/td>\n27.0<\/span><\/td>\n45.3<\/span><\/td>\n40<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
285<\/span><\/td>\n270<\/span><\/td>\n64.2<\/span><\/td>\n\u2013<\/span><\/td>\n27.8<\/span><\/td>\n46.0<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
290<\/span><\/td>\n275<\/span><\/td>\n64.5<\/span><\/td>\n104.5<\/span><\/td>\n28.5<\/span><\/td>\n46.5<\/span><\/td>\n41<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
295<\/span><\/td>\n280<\/span><\/td>\n64.8<\/span><\/td>\n\u2013<\/span><\/td>\n29.2<\/span><\/td>\n47.1<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
300<\/span><\/td>\n284<\/span><\/td>\n65.2<\/span><\/td>\n105.5<\/span><\/td>\n29.8<\/span><\/td>\n47.5<\/span><\/td>\n42<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
310<\/span><\/td>\n294<\/span><\/td>\n65.8<\/span><\/td>\n\u2013<\/span><\/td>\n31.0<\/span><\/td>\n48.4<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
320<\/span><\/td>\n303<\/span><\/td>\n66.4<\/span><\/td>\n107.0<\/span><\/td>\n32.2<\/span><\/td>\n49.4<\/span><\/td>\n45<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nSCM440, 445<\/span><\/td>\n<\/tr>\n
330<\/span><\/td>\n313<\/span><\/td>\n67.0<\/span><\/td>\n\u2013<\/span><\/td>\n33.3<\/span><\/td>\n50.2<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
340<\/span><\/td>\n322<\/span><\/td>\n67.6<\/span><\/td>\n108.0<\/span><\/td>\n34.4<\/span><\/td>\n51.1<\/span><\/td>\n47<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
350<\/span><\/td>\n331<\/span><\/td>\n68.1<\/span><\/td>\n\u2013<\/span><\/td>\n35.5<\/span><\/td>\n51.9<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nSUS Beads<\/span><\/td>\n<\/tr>\n
360<\/span><\/td>\n341<\/span><\/td>\n68.7<\/span><\/td>\n109.0<\/span><\/td>\n36.6<\/span><\/td>\n52.8<\/span><\/td>\n50<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
370<\/span><\/td>\n350<\/span><\/td>\n69.2<\/span><\/td>\n\u2013<\/span><\/td>\n37.7<\/span><\/td>\n53.6<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
380<\/span><\/td>\n360<\/span><\/td>\n69.8<\/span><\/td>\n110.0<\/span><\/td>\n38.8<\/span><\/td>\n54.4<\/span><\/td>\n52<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
390<\/span><\/td>\n369<\/span><\/td>\n70.3<\/span><\/td>\n\u2013<\/span><\/td>\n39.8<\/span><\/td>\n55.2<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
400<\/span><\/td>\n379<\/span><\/td>\n70.8<\/span><\/td>\n\u2013<\/span><\/td>\n40.8<\/span><\/td>\n56.0<\/span><\/td>\n55<\/span><\/td>\n5<\/span><\/td>\n5<\/span><\/td>\nApatite, Spring Steel SUP10<\/span><\/td>\n<\/tr>\n
410<\/span><\/td>\n388<\/span><\/td>\n71.4<\/span><\/td>\n\u2013<\/span><\/td>\n41.8<\/span><\/td>\n56.8<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
420<\/span><\/td>\n397<\/span><\/td>\n71.8<\/span><\/td>\n\u2013<\/span><\/td>\n42.7<\/span><\/td>\n57.5<\/span><\/td>\n57<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
430<\/span><\/td>\n405<\/span><\/td>\n72.3<\/span><\/td>\n\u2013<\/span><\/td>\n43.6<\/span><\/td>\n58.2<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
440<\/span><\/td>\n415<\/span><\/td>\n72.8<\/span><\/td>\n\u2013<\/span><\/td>\n44.5<\/span><\/td>\n58.8<\/span><\/td>\n59<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
450<\/span><\/td>\n425<\/span><\/td>\n73.3<\/span><\/td>\n\u2013<\/span><\/td>\n45.3<\/span><\/td>\n59.4<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
460<\/span><\/td>\n433<\/span><\/td>\n73.6<\/span><\/td>\n\u2013<\/span><\/td>\n46.1<\/span><\/td>\n60.1<\/span><\/td>\n62<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
470<\/span><\/td>\n442<\/span><\/td>\n74.1<\/span><\/td>\n\u2013<\/span><\/td>\n46.9<\/span><\/td>\n60.7<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
480<\/span><\/td>\n452<\/span><\/td>\n74.5<\/span><\/td>\n\u2013<\/span><\/td>\n47.7<\/span><\/td>\n61.3<\/span><\/td>\n64<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
490<\/span><\/td>\n460<\/span><\/td>\n74.9<\/span><\/td>\n\u2013<\/span><\/td>\n48.4<\/span><\/td>\n61.6<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
500<\/span><\/td>\n471<\/span><\/td>\n75.3<\/span><\/td>\n\u2013<\/span><\/td>\n49.1<\/span><\/td>\n62.2<\/span><\/td>\n66<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
510<\/span><\/td>\n479<\/span><\/td>\n75.7<\/span><\/td>\n\u2013<\/span><\/td>\n49.8<\/span><\/td>\n62.9<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
520<\/span><\/td>\n488<\/span><\/td>\n76.1<\/span><\/td>\n\u2013<\/span><\/td>\n50.5<\/span><\/td>\n63.5<\/span><\/td>\n67<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
530<\/span><\/td>\n497<\/span><\/td>\n76.4<\/span><\/td>\n\u2013<\/span><\/td>\n51.1<\/span><\/td>\n63.9<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
540<\/span><\/td>\n507<\/span><\/td>\n76.7<\/span><\/td>\n\u2013<\/span><\/td>\n51.7<\/span><\/td>\n64.4<\/span><\/td>\n69<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
550<\/span><\/td>\n571<\/span><\/td>\n77.0<\/span><\/td>\n\u2013<\/span><\/td>\n52.3<\/span><\/td>\n64.8<\/span><\/td>\n\u2013<\/span><\/td>\n5.5<\/span><\/td>\n.<\/span><\/td>\nFuji Glass Beads<\/span><\/td>\n<\/tr>\n
560<\/span><\/td>\n525<\/span><\/td>\n77.4<\/span><\/td>\n\u2013<\/span><\/td>\n53.0<\/span><\/td>\n65.4<\/span><\/td>\n71<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
570<\/span><\/td>\n535<\/span><\/td>\n77.8<\/span><\/td>\n\u2013<\/span><\/td>\n53.6<\/span><\/td>\n65.8<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
580<\/span><\/td>\n545<\/span><\/td>\n78.0<\/span><\/td>\n\u2013<\/span><\/td>\n54.1<\/span><\/td>\n66.2<\/span><\/td>\n72<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
590<\/span><\/td>\n554<\/span><\/td>\n78.4<\/span><\/td>\n\u2013<\/span><\/td>\n54.7<\/span><\/td>\n66.7<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
600<\/span><\/td>\n564<\/span><\/td>\n78.6<\/span><\/td>\n\u2013<\/span><\/td>\n55.2<\/span><\/td>\n67.0<\/span><\/td>\n74<\/span><\/td>\n6<\/span><\/td>\n6<\/span><\/td>\nFeldspar<\/span><\/td>\n<\/tr>\n
610<\/span><\/td>\n573<\/span><\/td>\n78.9<\/span><\/td>\n\u2013<\/span><\/td>\n55.7<\/span><\/td>\n67.5<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nZircon<\/span><\/td>\n<\/tr>\n
620<\/span><\/td>\n582<\/span><\/td>\n79.2<\/span><\/td>\n\u2013<\/span><\/td>\n56.3<\/span><\/td>\n67.9<\/span><\/td>\n75<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
630<\/span><\/td>\n591<\/span><\/td>\n79.5<\/span><\/td>\n\u2013<\/span><\/td>\n56.8<\/span><\/td>\n68.3<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
640<\/span><\/td>\n601<\/span><\/td>\n79.8<\/span><\/td>\n\u2013<\/span><\/td>\n57.3<\/span><\/td>\n68.7<\/span><\/td>\n77<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
650<\/span><\/td>\n611<\/span><\/td>\n80.0<\/span><\/td>\n\u2013<\/span><\/td>\n57.8<\/span><\/td>\n69.0<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n7<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
660<\/span><\/td>\n620<\/span><\/td>\n80.3<\/span><\/td>\n\u2013<\/span><\/td>\n58.3<\/span><\/td>\n69.4<\/span><\/td>\n79<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nHard Glass Beads<\/span><\/td>\n<\/tr>\n
670<\/span><\/td>\n630<\/span><\/td>\n80.6<\/span><\/td>\n\u2013<\/span><\/td>\n58.8<\/span><\/td>\n69.8<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
680<\/span><\/td>\n\u2013<\/span><\/td>\n80.8<\/span><\/td>\n\u2013<\/span><\/td>\n59.2<\/span><\/td>\n70.1<\/span><\/td>\n80<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
690<\/span><\/td>\n\u2013<\/span><\/td>\n81.1<\/span><\/td>\n\u2013<\/span><\/td>\n59.7<\/span><\/td>\n70.5<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
700<\/span><\/td>\n\u2013<\/span><\/td>\n81.3<\/span><\/td>\n\u2013<\/span><\/td>\n60.1<\/span><\/td>\n70.8<\/span><\/td>\n81<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nSteel Beads<\/span><\/td>\n<\/tr>\n
720<\/span><\/td>\n\u2013<\/span><\/td>\n81.8<\/span><\/td>\n\u2013<\/span><\/td>\n61.0<\/span><\/td>\n71.5<\/span><\/td>\n83<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
740<\/span><\/td>\n\u2013<\/span><\/td>\n82.2<\/span><\/td>\n\u2013<\/span><\/td>\n61.8<\/span><\/td>\n72.1<\/span><\/td>\n84<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
760<\/span><\/td>\n\u2013<\/span><\/td>\n82.6<\/span><\/td>\n\u2013<\/span><\/td>\n62.5<\/span><\/td>\n72.6<\/span><\/td>\n86<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
780<\/span><\/td>\n\u2013<\/span><\/td>\n83.0<\/span><\/td>\n\u2013<\/span><\/td>\n63.3<\/span><\/td>\n73.3<\/span><\/td>\n87<\/span><\/td>\n7<\/span><\/td>\n8<\/span><\/td>\nQuartz, Crystal<\/span><\/td>\n<\/tr>\n
800<\/span><\/td>\n\u2013<\/span><\/td>\n83.4<\/span><\/td>\n\u2013<\/span><\/td>\n64.0<\/span><\/td>\n73.8<\/span><\/td>\n88<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\nSKH High-Speed Tool Steel<\/span><\/td>\n<\/tr>\n
820<\/span><\/td>\n\u2013<\/span><\/td>\n83.8<\/span><\/td>\n\u2013<\/span><\/td>\n64.7<\/span><\/td>\n74.3<\/span><\/td>\n90<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
840<\/span><\/td>\n\u2013<\/span><\/td>\n84.1<\/span><\/td>\n\u2013<\/span><\/td>\n65.3<\/span><\/td>\n74.8<\/span><\/td>\n91<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
860<\/span><\/td>\n\u2013<\/span><\/td>\n84.4<\/span><\/td>\n\u2013<\/span><\/td>\n65.9<\/span><\/td>\n75.3<\/span><\/td>\n92<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
880<\/span><\/td>\n\u2013<\/span><\/td>\n84.7<\/span><\/td>\n\u2013<\/span><\/td>\n66.4<\/span><\/td>\n75.7<\/span><\/td>\n93<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
900<\/span><\/td>\n\u2013<\/span><\/td>\n85.0<\/span><\/td>\n\u2013<\/span><\/td>\n67.0<\/span><\/td>\n76.1<\/span><\/td>\n95<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
920<\/span><\/td>\n\u2013<\/span><\/td>\n85.3<\/span><\/td>\n\u2013<\/span><\/td>\n67.5<\/span><\/td>\n76.5<\/span><\/td>\n96<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
940<\/span><\/td>\n\u2013<\/span><\/td>\n85.6<\/span><\/td>\n\u2013<\/span><\/td>\n68.0<\/span><\/td>\n76.9<\/span><\/td>\n97<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1000<\/span><\/td>\n\u2013<\/span><\/td>\n86.2<\/span><\/td>\n\u2013<\/span><\/td>\n68.9<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1050<\/span><\/td>\n\u2013<\/span><\/td>\n86.6<\/span><\/td>\n\u2013<\/span><\/td>\n69.6<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1100<\/span><\/td>\n\u2013<\/span><\/td>\n87.1<\/span><\/td>\n\u2013<\/span><\/td>\n70.3<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1150<\/span><\/td>\n\u2013<\/span><\/td>\n87.5<\/span><\/td>\n\u2013<\/span><\/td>\n70.9<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1200<\/span><\/td>\n\u2013<\/span><\/td>\n87.9<\/span><\/td>\n\u2013<\/span><\/td>\n71.5<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1250<\/span><\/td>\n\u2013<\/span><\/td>\n88.3<\/span><\/td>\n\u2013<\/span><\/td>\n72.1<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n8<\/span><\/td>\n9<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1300<\/span><\/td>\n\u2013<\/span><\/td>\n88.7<\/span><\/td>\n\u2013<\/span><\/td>\n72.7<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n8.3<\/span><\/td>\n10<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1350<\/span><\/td>\n\u2013<\/span><\/td>\n89.1<\/span><\/td>\n\u2013<\/span><\/td>\n73.4<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1400<\/span><\/td>\n\u2013<\/span><\/td>\n89.6<\/span><\/td>\n\u2013<\/span><\/td>\n74.0<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1450<\/span><\/td>\n\u2013<\/span><\/td>\n90.1<\/span><\/td>\n\u2013<\/span><\/td>\n74.6<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n9<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1500<\/span><\/td>\n\u2013<\/span><\/td>\n90.5<\/span><\/td>\n\u2013<\/span><\/td>\n75.3<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1600<\/span><\/td>\n\u2013<\/span><\/td>\n91.3<\/span><\/td>\n\u2013<\/span><\/td>\n76.6<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1700<\/span><\/td>\n\u2013<\/span><\/td>\n91.9<\/span><\/td>\n\u2013<\/span><\/td>\n77.9<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1800<\/span><\/td>\n\u2013<\/span><\/td>\n92.6<\/span><\/td>\n\u2013<\/span><\/td>\n79.2<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n11<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
1900<\/span><\/td>\n\u2013<\/span><\/td>\n93.1<\/span><\/td>\n\u2013<\/span><\/td>\n80.5<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n9<\/span><\/td>\n12<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
2000<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
2100<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
2150<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n84.0<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n13<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
2200<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
2250<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n85.0<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n14<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
2500<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
3000<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
4000<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
5000<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n.<\/span><\/td>\n<\/tr>\n
9000<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n\u2013<\/span><\/td>\n10<\/span><\/td>\n15<\/span><\/td>\nDiamond<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

It's actually pretty interesting if you all take a moment to look into things like the hardness of bits.<\/p>\n

Since the bedrock consists of various interlayered strata, it\u2019s hard to generalize, but it is one indicator.<\/p>\n

That said, the number of bits you can actually use is limited, and depending on the manufacturer, there are even ones designed for ultra-hard rock, so it\u2019s interesting to ask about the HRC rating, isn\u2019t it?<\/p>\n

 <\/p>\n

See you later.<\/p>","protected":false},"excerpt":{"rendered":"

Hello, everyone. This is Enta. This is a bit for a down-the-hole hammer. It\u2019s a bit with a drilling diameter of about 110 mm, and I\u2019ve used it to drill about 60 holes since it was brand new. And this is what it looks like now, lol. Here\u2019s a side view. The main body is already worn down. I wonder if the cutting edges are worn out\u2026<\/p>","protected":false},"author":2,"featured_media":5235,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_total_topic_count_hidden":0,"_bbp_total_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[1886,1],"tags":[205,497,601,1778,4368,4521,4522,4523],"class_list":["post-44401","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","category-others","tag-205","tag-497","tag-601","tag-1778","tag-4368","tag-4521","tag-hrc","tag-4523"],"acf":[],"yoast_head":"\n\u30d3\u30c3\u30c8\u306e\u786c\u3055\u306f\u3044\u308d\u3044\u308d\uff5c\u5c71\u306b\u5fdc\u3058\u3066\u5bfe\u5fdc - 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