5/16"-18 x 3 1/2" (PT) Coarse Thread A307 Grade A Hex Bolt Low Carbon Steel Plain Finish

PRODUCT SPECIFICATIONS (Part # 0000-118804)
Fastener Type:	Hex Bolt
Size Description:	5/16"-18 x 3 1/2" (PT)
Diameter/Nominal Size:	5/16"
Length:	3 1/2"
Wrench Size/Across Flats:	1/2" (0.489-0.500")
Width Across Corners:	0.557-0.577"
Head Height:	13/64" (0.195-0.211")
Thread Pitch:	18
Thread Pitch Type:	Coarse
Thread Direction:	Right
Thread Coverage:	Partial
System of Measurement:	Inch
Grade:	A (2)
Material:	Low Carbon Steel
Finish:	Plain Finish (No Plating)
Head Type:	Hex
Drive Type:	External Hex
Standards Met:	A307
Average Piece Weight:	0.0821700 lbs.

Hexagonal heads and machine threads used with a nut or in a tapped hole; also known as or machine bolts. Hex bolts are similar to hex cap screws.

What is the difference between a hex cap screw and a hex bolt? A hex cap screw has tighter tolerances on the body dimensions and features a chamfered end and a washer face under the bolt head. A hex cap screw is often called a finished hex bolt. Hex bolts have a flat end and lack the washer face under the head. Hex bolts may have an undersize body in longer lengths.