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  • Nominal Size. Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Screws. Drilled hexagon socket head cap screws shall conform to the respective dimensions and requirements set forth.
  • Number of Holes. Screws shall have 2, 4, or 6 holes drilled in the head as designated by the purchaser. For sizes 6 (0.138 in.) and smaller, the use of only 2 holes is recommended.
  • Holes. Hole size and location from the top of the head shall conform to the specifications given in this table. For sizes 8 (0.164 in.) and larger, the drilled hole shall lie within the flats of the hexagon socket and not break through the socket corners. Positioning of holes on opposite sides of the socket shall be such that the hole alignment check plug will pass completely through the head on all screw sizes.
    For commercial quality screws, the edge of the holes on the outside of the head may be chamfered or broken. The edge of the holes within the socket may contain burrs to the extent that the socket will accept a key having the standard minimum width across the flats and the holes must allow the Type I drill check plug to pass from the outside of the head into the socket.
    For aircraft quality screws, the edge of the holes on the outside of the head shall be chamfered and there shall be no burr chips or slivers that might become dislodged during usage. The socket shall accept a key having the standard.
Unit of Measure

Manufacturer

Manufacturer

 N/A Industrial Fasteners Institute

Specifications

Product

 N/A Socket Screws

Unit of Measure

 N/A English

Nominal Size or Basic Screw Dia.

 N/A No. 4

Nominal Size or Basic Screw Dia. (Decimal)

 N/A 0.1120 in

Drilled Hole Dia. Number (U)

 N/A 65

Basic Drilled Hole Dia. (U)

 N/A 0.0350 in

Max. Head to Center of Hole (V)

 N/A 0.040 in

Min. Head to Center of Hole (V)

 N/A 0.026 in

Min. Head to Edge to Hole (W)

 N/A 0.008 in

Basic Type I Drill Check Plug Dia.

 N/A 0.030 in

Basic Type II Drill Check Plug Dia.

 N/A 0.033 in

Hole Alignment Check Plug Dia.

 N/A 0.025 in

Codes and Standards

Codes and Standards

 N/A ASME B18.3 2002
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