Metallics JG5HCF97 Bolts 1/2-20 x 2-1/2 G5 HXBT St-zn (Jar 25)

Grade 5 means a medium carbon steel cap screw that has been heat treated. The Metallics JG5HCF97 hex bolt is rated 105,000 psi minimum tensile and 105,000 psi minimum yield, with a hardness of Rockwell C19-30. That is the normal choice for bolting a motor to machinery and for automotive and truck repair work, well above an unmarked Grade 2 fastener.

Shank outside diameter is 0.4930 to 0.5000 inch, so a 1/2 inch clearance hole will bind. Drill 17/32 inch for a normal fit or 9/16 inch where you want some adjustment in the bracket.

Metallics lists JG5HCF97 as both ARRA compliant and Buy American compliant, which is what a government, school or healthcare procurement file usually needs on fasteners. Country of origin is recorded as multiple, so if your specification requires a single named origin on the submittal, ask for origin documentation on the lot you receive.

Across the flats the hex head measures 0.736 to 0.750 inch, so a 3/4 inch wrench or socket is the one you want. Head height runs 0.302 to 0.323 inch with a wrenching height of 0.215 inch, which matters if you are driving it in a counterbore or a tight clearance pocket.

The bolt is steel with a zinc finish, which handles indoor mechanical rooms, equipment skids and general machinery mounting fine. Zinc plating is a sacrificial coating, not a marine one, so for constant wetting, washdown or coastal exposure step up to hot dip galvanized or stainless instead.

JG5HCF97 ships as a jar of 25 bolts, and 25 each is the order minimum, so it is sold by the jar rather than by the piece. The jar packaging is the reason the JG prefix exists on the part number. Other sizes and quantities in the G5HC and JG5HC series are available by request.

Dimensions follow ASME B18.2.1-2012, the standard hex bolt and hex cap screw dimensional spec, so the head and shank will interchange with any other B18.2.1 bolt of the same size. Steel is in the AISI 1008 to 1026 range, heat treated to Grade 5 properties.

A Grade 5 hex bolt like this one is a through fastener: it wants a clearance hole on both sides with a nut, or a tapped hole in the machine base. For mounting a motor to a frame, a bracket to a skid, or truck and automotive repair, that is exactly the application. If you are fixing into concrete, a hex bolt is the wrong part and you need a concrete anchor instead.