Metallics JG5HTB25 Bolts 3/8-16 X 2-1/2 G5 Hx Tap Blt S (Jar 100)

Yes. A hex tap bolt is fully threaded along its length, which is what separates it from a partially threaded hex cap screw. The JG5HTB25 is a 3/8-16 bolt, 16 threads per inch, right hand thread, made to ASME B18.2.1-2012. Full threading lets you use it in a tapped hole at any engagement depth, which is why it is a common choice for bolting a motor base to machinery.

Body diameter runs 0.3690 to 0.3750 inch, so a clearance hole needs to be larger than 3/8 inch (7/16 inch is the usual clearance drill). If you are tapping the hole instead, it takes a 3/8-16 UNC tap, 16 threads per inch right hand.

Grade 5 medium carbon steel, heat treated, with a minimum 105,000 psi tensile and hardness of Rockwell C19-30. That is the standard structural fastener for machinery and motor mounting, automotive and truck repair work. Grade 8 only earns its place where the joint sees high preload or shock loading beyond Grade 5 capacity; for routine motor-to-base and equipment bracket work, Grade 5 is what the job calls for.

Zinc plating over steel handles indoor and sheltered industrial environments well, but it is a sacrificial coating. In a continuously wet, washdown, coastal or chemically aggressive location the plating gives up and the steel underneath rusts. For those installs, specify 18-8 stainless or hot dip galvanized hex tap bolts instead of the zinc plated Grade 5.

The JG5HTB25 hex tap bolt is flagged compliant for both ARRA and Buy American in Metallics' product data, with country of origin China. On federally funded work, fastener compliance determinations vary by contract clause and by whether the fastener is treated as a component, so match these flags against the clause written into your specific contract before submitting.

Threading is the whole difference. A hex tap bolt like the 3/8-16 x 2-1/2 Grade 5 is threaded full length, so it works in a tapped hole where you want thread engagement right up under the head, or with a nut at any grip length. A hex cap screw of the same size has an unthreaded shank under the head, which gives better shear in a clearance hole where the joint line falls on the body. For bolting a motor foot into a tapped machine base, the tap bolt is the one you want.

Steel in the AISI 1008 to 1026 range, heat treated to Grade 5 properties: Rockwell C19-30 hardness and 105,000 psi minimum tensile. That combination is why it is routinely used in automotive and truck repair as well as machinery mounting, where a plain low carbon unhardened bolt would stretch.