• Each end shall be square with the axis of each arm within 4 deg, and edges may be sharp or chamfered at the option of the manufacturer. The chamfer shall not exceed the values listed.
  • Any truncation or rounding of hexagon corners within the specified across-corner dimensions shall be evident on all corners.
  • Material (Steel Alloy). Hexagon keys and bits shall be fabricated from an alloy steel having two or more of the following alloying elements: chromium, nickel, molybdenum, or vanadium, in sufficient quantity to assure that the specified minimum hardness of 48 HRC at the surface for sizes up to and including 3/8 in., and 45 HRC for sizes over 3/8 in., is met when hexagon keys and bits are hardened by quenching from the austenitizing temperature and tempered.
Unit of Measure

Manufacturer

Manufacturer

N/A Industrial Fasteners Institute

Specifications

Product

N/A Socket Screws

Unit of Measure

N/A English

Nominal Key or Bit and Socket Size

N/A 3/16 in

Nominal Key or Bit and Socket Size (Decimal)

N/A 0.188 in

Max. Hexagon Width Across Flats (W)

N/A 0.1875 in

Min. Hexagon Width Across Flats (W)

N/A 0.1860 in

Max. Hexagon Width Across Corners (Y)

N/A 0.2135 in

Min. Hexagon Width Across Corners (Y)

N/A 0.2105 in

Max. Length (B)

N/A 1.031 in

Min. Length (B)

N/A 0.844 in

Max. Short Arm Series Length (C)

N/A 2.844 in

Min. Short Arm Series Length (C)

N/A 2.656 in

Max. Long Arm Series Length (C)

N/A 4.594 in

Min. Long Arm Series Length (C)

N/A 4.406 in

Min. Radius of Bend (R)

N/A 0.188 in

Max. Chamfer (K)

N/A 0.022 in

Codes and Standards

Codes and Standards

N/A ASME B18.3 2002
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