• 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.
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Unit of Measure
Items
Hexagon Keys and Bits

Hexagon Key and Bit, 0.028" Nominal Dia.
Hexagon Keys and Bits

Hexagon Key and Bit, 0.035" Nominal Dia.
Hexagon Keys and Bits

Hexagon Key and Bit, 0.050" Nominal Dia.
Hexagon Keys and Bits

Hexagon Key and Bit, 0.062" Nominal Dia.
Hexagon Keys and Bits

Hexagon Key and Bit, 0.078" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Socket Screws
Codes and Standards N/A ASME B18.3 2002
Unit of Measure N/A English
Nominal Key or Bit and Socket Size N/A N/A N/A N/A 1/16 in N/A 5/64 in
Nominal Key or Bit and Socket Size (Decimal) N/A 0.028 in N/A 0.035 in N/A 0.050 in N/A 0.062 in N/A 0.078 in
Max. Hexagon Width Across Flats (W) N/A 0.0280 in N/A 0.0350 in N/A 0.0500 in N/A 0.0625 in N/A 0.0781 in
Min. Hexagon Width Across Flats (W) N/A 0.0275 in N/A 0.0345 in N/A 0.0490 in N/A 0.0615 in N/A 0.0771 in
Max. Hexagon Width Across Corners (Y) N/A 0.0314 in N/A 0.0393 in N/A 0.0560 in N/A 0.0701 in N/A 0.0880 in
Min. Hexagon Width Across Corners (Y) N/A 0.0300 in N/A 0.0378 in N/A 0.0540 in N/A 0.0680 in N/A 0.0859 in
Max. Length (B) N/A 0.312 in N/A 0.438 in N/A 0.625 in N/A 0.656 in N/A 0.703 in
Min. Length (B) N/A 0.125 in N/A 0.250 in N/A 0.438 in N/A 0.469 in N/A 0.516 in
Max. Short Arm Series Length (C) N/A 1.312 in N/A 1.312 in N/A 1.750 in N/A 1.844 in N/A 1.969 in
Min. Short Arm Series Length (C) N/A 1.125 in N/A 1.125 in N/A 1.562 in N/A 1.656 in N/A 1.781 in
Max. Long Arm Series Length (C) N/A 2.688 in N/A 2.766 in N/A 2.938 in N/A 3.094 in N/A 3.281 in
Min. Long Arm Series Length (C) N/A 2.500 in N/A 2.578 in N/A 2.750 in N/A 2.906 in N/A 3.094 in
Min. Radius of Bend (R) N/A 0.062 in N/A 0.062 in N/A 0.062 in N/A 0.062 in N/A 0.078 in
Length of Bit (L) N/A
Tolerance for L N/A
Max. Chamfer (K) N/A 0.003 in N/A 0.004 in N/A 0.006 in N/A 0.008 in N/A 0.008 in
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