flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.057" hole diameter head drilled 0.057 in. min 0.078 in. max dia, 0.080 in. min 0.100 in. max deep
oval/truss head style any acceptable hole diameter any acceptable grip length 35000 double pounds per square inch shear strength oxide or nickel surface treated