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- 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%.
- 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 the specified limits for minimum wrenching height.
- Bearing Surface. Bearing surface shall be flat and washer faced. Diameter of washer face shall be equal to the maximum width across flats within a tolerance of minus 10 percent.
Thickness of the washer face shall be not less than 0.015 in. nor greater than 0.025 in. for screw sizes 3/4 in. and smaller, and not less than 0.015 in. nor greater than 0.035 in. for sizes larger than 3/4 in. Measurement of washer face diameter shall be taken at a height of 0.004 in. above the bearing surface.
Unit of Measure
Specifications
Product |
N/A Square and Hex Bolts and Screws |
Unit of Measure |
N/A English |
Nominal Size or Basic Product Diameter |
N/A 1-3/8 in |
Nominal Size or Basic Product Diameter (Decimal) |
N/A 1.3750 in |
Max. Body Diameter (E) |
N/A 1.3750 in |
Min. Body Diameter (E) |
N/A 1.345 in |
Basic Width Across Flats (F) |
N/A 2-3/16 in |
Max. Width Across Flats (F) |
N/A 2.188 in |
Min. Width Across Flats (F) |
N/A 2.119 in |
Max. Width Across Corners (G) |
N/A 2.526 in |
Min. Width Across Corners (G) |
N/A 2.416 in |
Basic Head Height (H) |
N/A 27/32 in |
Max. Head Height (H) |
N/A 0.878 in |
Min. Head Height (H) |
N/A 0.810 in |
Min. Wrenching Height (J) |
N/A 0.569 in |
Max. Transition Thread Length (Y) |
N/A 0.833 in |
Max. Circular Runout of Bearing Surface FIM |
N/A 0.038 in |
