Item # HCS02500XXX, Hex Cap Screw, 1/4" Nominal Dia. On Sales Systems Ltd.

Top of Head. Top of head shall be full form and chamfered, with the diameter of chamfer circle being equal to the maximum width across flats within a tolerance of minus 15 percent.
Wrenching Height, J. Wrenching height is a distance measured from the bearing surface up the side of the head at the corners. The width across corners shall be within specified limits for the full wrenching height.
Bearing Surface. Bearing surface shall be flat and washer

Unit of Measure

Manufacturer | Specifications | Codes and Standards | Thread Length for Screw Lengths

N/A Industrial Fasteners Institute

Product	N/A Square and Hex Bolts and Screws
Unit of Measure	N/A English
Nominal Size or Basic Product Diameter	N/A 1/4 in
Nominal Size or Basic Product Diameter (Decimal)	N/A 0.2500 in
Max. Body Diameter (E)	N/A 0.2500 in
Min. Body Diameter (E)	N/A 0.2450 in
Basic Width Across Flats (F)	N/A 7/16 in
Max. Width Across Flats (F)	N/A 0.438 in
Min. Width Across Flats (F)	N/A 0.428 in
Max. Width Across Corners (G)	N/A 0.505 in
Min. Width Across Corners (G)	N/A 0.488 in
Basic Head Height (H)	N/A 5/32 in
Max. Head Height (H)	N/A 0.163 in
Min. Head Height (H)	N/A 0.150 in
Min. Wrenching Height (J)	N/A 0.106 in
Max. Transition Thread Length (Y)	N/A 0.250 in
Max. Circular Runout of Bearing Surface FIM	N/A 0.010 in

N/A ASME B18.2.1 1996

Nom. L_T for Screw Length (6 in. and Shorter)	N/A 0.750 in
Nom. L_T for Screw Length (Over 6 in.)	N/A 1.000 in

Manufacturer