Metallics JG5HTB221 Bolts 5/16-18 x 5 G5 Hx Tap Blt St-zn (Jar 100)

Yes. A hex tap bolt is fully threaded, unlike a hex cap screw with a plain shank, so the 5/16-18 thread runs the full 5 inch length. That matters when you are pulling a motor base down into a tapped hole and need thread engagement right up at the head. Threads are right hand, 18 per inch, made to ASME B18.2.1-2012.

Grade 5 means medium carbon steel that has been heat treated, rated at 105,000 psi minimum tensile and 105,000 psi minimum yield, with a hardness of Rockwell C19-30. Grade 2 is unheat-treated and considerably weaker, which is why motor mounting, machinery, and truck repair work calls for Grade 5. You can identify it in the field by the three radial lines on the head.

Measured shank diameter is 0.3065 to 0.3125 inch, so a 5/16 inch through hole will be a tight slip fit; most shops run a 11/32 inch clearance hole instead. If you are tapping the hole, it is a 5/16-18 right hand thread.

The hex head measures 0.489 to 0.500 inch across the flats, so a 1/2 inch wrench or socket is the one you want. Head height is 13/64 inch, with 0.14 inch of wrenching height, so keep that in mind if you are working in a counterbored or recessed pocket.

Zinc plating over steel is a mild corrosion barrier, fine for indoor mechanical rooms, motor frames, and under-hood automotive work. For sustained wet exposure, coastal air, or chemical washdown, step up to stainless; the Metallics hex tap bolt line also runs in 18-8 stainless. Zinc plated steel in a buried, submerged, or heavily corrosive location will eventually rust at the thread roots.

The record flags the bolt as ARRA compliant and Buy American compliant, with country of origin China. On federally funded work where the contract enforces a domestic melt-and-manufacture requirement rather than the ARRA flag, confirm with your specifying authority which standard applies before you commit the fastener package.

The 5 inch length is for deep clamp-ups, through a motor base plus channel, spacers, or a thick bracket. Because a tap bolt is threaded full length, extra grip past what you need is wasted but not harmful, though you should keep at least a thread or two of stickout. The jar contains bolts only; nuts, flat washers, and lock washers are separate items, and anything you pair with it needs to be 5/16-18.

Material is steel to AISI 1008 through 1026, a medium to low carbon range, then heat treated to reach the Grade 5 property class at Rockwell C19-30. That heat treatment is the reason you should not weld on these or reuse one that has been pulled past yield.

Yes. The G5HTB and JG5HTB zinc plated Grade 5 hex tap bolt series runs other diameters and lengths, and other pack quantities are available by request. If 5/16-18 x 5 is longer or shorter than your grip requires, ask for the matching size in the same series so the grade, finish, and thread standard stay consistent across the job.