Metallics JMHTB412 Bolts M4 x 12 C8.8 Hx Tap Blt St-zn (Jar 100)

Yes. The JMHTB412 is a tap bolt, meaning the thread runs full length on the 12mm shank right up to directly beneath the hex head, so there is no unthreaded grip section. That matters when you are bolting into a tapped blind hole or through a thin bracket and want thread engagement across the whole depth. The head has a washer face under it to seat flat on the bearing surface.

It is an M4 metric bolt with a 0.7mm thread pitch, which is standard M4 coarse, and the thread is right hand. So it mates with any standard M4 coarse nut or M4 x 0.7 tapped hole. It will not fit a fine-pitch M4 x 0.5 hole.

No. The JMHTB412 is not Buy American compliant and is not ARRA compliant, and country of origin is listed as multiple. If your government, transit, or federally funded job carries a domestic-content clause, source a domestically produced fastener for that scope.

Grade 8.8 medium carbon steel, heat treated, with a hardness of Rockwell C22-32. The published figures are a minimum tensile strength of 11600 psi and a minimum yield of 92800 psi. It is a structural-duty fastener rather than a general low-carbon bolt, which is why it gets used for motor mounting and machinery work.

The JMHTB412 is zinc plated steel. Zinc plating handles indoor and sheltered conditions well, which covers the electrical, plumbing, heating and air conditioning work these are sold for. For sustained outdoor exposure, washdown, or coastal salt air, step up to stainless or hot dip galvanized hardware instead.

These ship as a jar of 100 pieces, and the jar is the minimum order unit, so one jar of 100 is the smallest quantity. Jar weight is 209 g. Metallics makes other sizes and quantities in the MHTB and JMHTB tap bolt series available on request.

A tap bolt like the M4 x 12 JMHTB412 is threaded the entire shank length, so it is the right pick when you are threading into a tapped hole in a casting or motor foot and want maximum engagement in a short grip. A hex cap screw leaves part of the shank unthreaded, which is preferred where you want the smooth shank bearing in a shear joint or spanning a clearance hole. At 12mm long there is very little shank to leave plain, which is why this size is offered as a full-thread tap bolt.

No, the jar contains hex tap bolts only. The head is formed with an integral washer face underneath, but that is not a substitute for a flat washer on soft or painted surfaces. Order M4 coarse nuts and M4 washers separately if the joint needs them.