Metallics JG5HTB72 Bolts 5/8-11 x 4 G5 Hx Tap Blt St-zn (Jar 25)

It is a 5/8-11 right hand thread, 11 threads per inch, cut to the ASME B18.2.1-2012 dimensional standard. Measured shank outside diameter runs 0.6170 to 0.6250 inch. Overall length is 4 inches, and being a tap bolt the thread runs the full length rather than stopping short of the head, so it will pull up tight in a tapped hole or a nut at any grip thickness up to 4 inches.

That is the job these are built for. Grade 5 means medium carbon steel, heat treated, with 105,000 psi minimum tensile and 105,000 psi minimum yield, hardness Rockwell C19-30. Metallics calls out motor mounting to machinery as the primary use, along with automotive and truck repair. For a motor base pulling against belt tension and vibration, Grade 5 is the normal commercial choice. Only step up to Grade 8 if an engineered drawing specifically calls for it.

No. The JG5HTB72 is not Buy American compliant and not ARRA compliant, with country of origin listed as multiple. If your project has domestic sourcing language in the spec, these will not satisfy it and you need a domestically produced Grade 5 hex bolt instead.

The JG5HTB72 is steel with a zinc finish, which handles indoor mechanical rooms, equipment rooms and sheltered exterior conditions. Zinc plating is a sacrificial coating, not stainless, so for direct weather exposure, coastal air, or anything wet continuously you want hot dip galvanized or stainless instead.

These ship in a jar of 25, and 25 each is the order minimum, so a jar is the smallest buy. Metallics does make other lengths and quantities in the G5HTB and JG5HTB hex tap bolt series available by request if 5/8-11 x 4 in a 25 count is not the pack you need.

A hex tap bolt is threaded the full length of the shank; a standard hex cap screw has a plain unthreaded grip section under the head. Full thread is what you want when you are threading into a tapped hole of unknown depth, stacking shims under a motor base, or need the clamp to work across a range of grip thicknesses. If the joint is loaded in shear and the design calls for the shank to bear on the hole rather than threads, use a partially threaded cap screw of the same 5/8-11 size and Grade 5 strength instead.

Nuts and washers are not included, so order them separately. For a through-bolted joint you want a 5/8-11 right hand hex nut of matching Grade 5 strength or higher, plus 5/8 inch hardened flat washers under the head and nut to spread load on the motor base or channel. Zinc plated nuts and washers keep the finish consistent with the bolt's zinc plating and avoid mixing coatings in the same joint.