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  • Applicable socket depths are specified in the dimensional tables and notes for the respective screw types.
  • For broached sockets, the maximum acceptable overcut shall be a size causing an average 20 percent flat length reduction in the maximum dimension across flat hexagon for socket sizes up to and including 1 in., and 30 percent for larger sockets. The maximum overcut on any one of the six flats shall not exceed a 40 percent reduction in flat length for any size socket.
  • Where hexagon sockets are chamfered, the depth of chamfer shall not exceed 10 percent of the nominal socket size for sizes up to and including 1/16 in., and 7.5 percent for larger sizes. For chamfered sockets, it is permissible for the NOT GO socket gage to enter to the depth of chamfer as specified in Appendix.
  • Sockets up to and including 1 in. nominal size shall be checked in accordance with the hexagon socket gages and gaging specified in Appendix. Suitability of larger sockets shall be determined by means of direct measurement for various technical and economic reasons.
  • Dimensions of sockets apply before plating.
  • Broach petals at the bottom of the socket are permissible.
Hexagon Sockets
Unit of Measure
Items Hexagon Sockets
HS0028XXX
Hexagon Socket, 0.028" Nominal Dia.
Hexagon Sockets
HS0035XXX
Hexagon Socket, 0.035" Nominal Dia.
Hexagon Sockets
HS0050XXX
Hexagon Socket, 0.050" Nominal Dia.
Hexagon Sockets
HS0062XXX
Hexagon Socket, 0.062" Nominal Dia.
Hexagon Sockets
HS0078XXX
Hexagon Socket, 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 Socket Size N/A N/A N/A N/A 1/16 in N/A 5/64 in
Nominal 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. Socket Width Across Flats (J) N/A 0.0285 in N/A 0.0355 in N/A 0.0510 in N/A 0.0635 in N/A 0.0791 in
Min. Socket Width Across Flats (J) 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