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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 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
Specifications
Product |
N/A Square and Hex Bolts and Screws |
Unit of Measure |
N/A English |
Nominal Size or Basic Product Diameter |
N/A 1-1/4 in |
Nominal Size or Basic Product Diameter (Decimal) |
N/A 1.2500 in |
Max. Body Diameter (E) |
N/A 1.2500 in |
Min. Body Diameter (E) |
N/A 1.2390 in |
Basic Width Across Flats (F) |
N/A 1-7/8 in |
Max. Width Across Flats (F) |
N/A 1.875 in |
Min. Width Across Flats (F) |
N/A 1.812 in |
Max. Width Across Corners (G) |
N/A 2.165 in |
Min. Width Across Corners (G) |
N/A 2.066 in |
Basic Head Height (H) |
N/A 25/32 in |
Max. Head Height (H) |
N/A 0.813 in |
Min. Head Height (H) |
N/A 0.749 in |
Min. Wrenching Height (J) |
N/A 0.530 in |
Max. Transition Thread Length (Y) |
N/A 0.714 in |
Max. Circular Runout of Bearing Surface FIM |
N/A 0.033 in |
