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Sales Systems Limited Products and Services > Fasteners Reference Guide > Bolts / Screws > Square and Hex Bolts and Screws > Heavy Hex Screws > Item # HHS13750XXX  
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Item # HHS13750XXX, Heavy Hex Screw, 1-3/8" Nominal Dia.


  • 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.




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

Manufacturer

Manufacturer
Industrial Fasteners Institute


Specifications

Product
Square and Hex Bolts and Screws

Unit of Measure
English

Nominal Size or Basic Product Diameter
1-3/8 in

Nominal Size or Basic Product Diameter (Decimal)
1.3750 in

Max. Body Diameter (E)
1.3750 in

Min. Body Diameter (E)
1.345 in

Basic Width Across Flats (F)
2-3/16 in

Max. Width Across Flats (F)
2.188 in

Min. Width Across Flats (F)
2.119 in

Max. Width Across Corners (G)
2.526 in

Min. Width Across Corners (G)
2.416 in

Basic Head Height (H)
27/32 in

Max. Head Height (H)
0.878 in

Min. Head Height (H)
0.810 in

Min. Wrenching Height (J)
0.569 in

Max. Transition Thread Length (Y)
0.833 in

Max. Circular Runout of Bearing Surface FIM
0.038 in


Codes and Standards

Codes and Standards
ASME B18.2.1 1996


Thread Length for Screw Lengths

Nom. LT for Screw Length (6 in. and Shorter)
3.000 in

Nom. LT for Screw Length (Over 6 in.)
3.250 in


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