5/16-18 x 1-3/8 Zinc Plated Steel Coarse Thread Battery Bolt
Part Number: 09216
Head Style: Square (1/2" Wrench)
Thread Size: 18 (Coarse)
Hardness: Grade 2 / A307
Type: Square Head Bolt
Box of 50.
A square head bolt has a four-sided head. Compared to standard hex bolts, square bolts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening). Square bolts are typically mated with square-headed nuts.
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