Item # HKB0438XXX, Hexagon Key and Bit, 0.438" Nominal Dia. On Sales Systems Ltd.

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 | Specifications | Codes and Standards

N/A Industrial Fasteners Institute

Product	N/A Socket Screws
Unit of Measure	N/A English
Nominal Key or Bit and Socket Size	N/A 7/16 in
Nominal Key or Bit and Socket Size (Decimal)	N/A 0.438 in
Max. Hexagon Width Across Flats (W)	N/A 0.4375 in
Min. Hexagon Width Across Flats (W)	N/A 0.4355 in
Max. Hexagon Width Across Corners (Y)	N/A 0.5005 in
Min. Hexagon Width Across Corners (Y)	N/A 0.4944 in
Max. Length (B)	N/A 1.594 in
Min. Length (B)	N/A 1.406 in
Max. Short Arm Series Length (C)	N/A 4.844 in
Min. Short Arm Series Length (C)	N/A 4.656 in
Max. Long Arm Series Length (C)	N/A 7.594 in
Min. Long Arm Series Length (C)	N/A 7.406 in
Min. Radius of Bend (R)	N/A 0.438 in
Max. Chamfer (K)	N/A 0.047 in

N/A ASME B18.3 2002

Manufacturer