Metallics JCB6 Bolts 1/4-20 X 3 Carriage Blt St-zn (Jar 100)

The JCB6 is a 1/4-20 x 3 inch carriage bolt in zinc plated steel, sold 100 per jar. Thread is 20 threads per inch, right hand. Shank measures 0.237 to 0.260 inch outside diameter, and overall fastener length is 3 inches.

Published minimums are 60,000 psi tensile and 36,000 psi yield, with hardness of Rockwell B70 to B100. That is low carbon commercial strength, fine for hanging strut, mounting boxes, panels and general equipment support. If an engineer's drawing calls for a higher strength structural bolt, this is not the fastener for that connection.

No. The JCB6 is not Buy American compliant and is not ARRA compliant, with country of origin listed as multiple. On federally funded work with domestic sourcing requirements you need a domestically produced fastener instead.

The jar contains 100 bolts only. Carriage bolts ship bare, so order 1/4-20 hex nuts and, if you are bolting through sheet metal or soft material, flat washers for the nut side separately. No washer goes under the mushroom head, that face is meant to bear directly on the surface.

Zinc plated steel is a dry to mildly damp duty finish. It handles interior electrical, plumbing, heating and air conditioning work well, but for exterior exposure, washdown areas, coastal sites or anywhere in contact with treated lumber you want stainless rather than zinc plated carbon steel, since the plating will eventually sacrifice and the steel underneath will rust.

Dimensions conform to ASME B18.5-1990, the standard for round head bolts including carriage bolts. That is the reference to cite if a submittal or spec package asks for the governing dimensional standard on the fastener.