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Sockets
sockets
Body. The term body refers to the unthreaded cylindrical portion of the shank for those screws not threaded to the head.
Head Diameter. Heads shall be plain, not knurled.
Head Chamfer. The top of the head shall be flat. The intersection of the top of the head and side of the head may be chamfered or radiused within the limits of C, at the manufacturer's option.
Bearing Surface. The plane of the bearing surface shall be perpendicular to the axis of the shank, with a maximum deviation of one degree, obtained by holding the screw on the body or major thread diameter within one dia. of the bearing surface of the head, but beyond the maximum /Asset/a1070.jpg
Drilled Hexagon Socket Head Cap Screws
(18)- 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.
Low Head Hexagon Socket Cap Screws
(11) General Note: This product, although a high strength precision fastener, is recommended for lighter fastening applications. It is not suggested for use in critical high strength applications where socket head cap screws should normally be used. They are designed to be used in applications where head height clearance is a problem. Because of their reduced head height, and smaller socket size, they normally cannot be properly preloaded as a standard socket cap screw and should not be subjected to high dynamic loads.Body. The term body refers to the unthreaded cylindrical portion of the shank for those screws not threaded to the head.
Head Diameter. Heads shall be plain, not knurled.
Head Chamfer. The top of the head shall be flat. The intersection of the top of the head and side of the head may be chamfered or radiused within the limits of C, at the manufacturer's option.
Bearing Surface. The plane of the bearing surface shall be perpendicular to the axis of the shank, with a maximum deviation of one degree, obtained by holding the screw on the body or major thread diameter within one dia. of the bearing surface of the head, but beyond the maximum /Asset/a1070.jpg
