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Socket Screws
socket-screws
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
This product is designed and recommended for light fastening applications such as guards, hinges, etc. It is not suggested for use in critical high strength applications where socket head cap screws should normally be used.
Notes:
Marutex® means
1. High hardness for drilling
2. Far superior corrosion resistance
The Special Ingredient in Ultra Stainless™
Marutex® adds 2% molybdenum (moly) to 410 stainless.
Moly is the significant component of 316 stainless that provides extra corrosion resistance.
Now moly is added to 410 self drilling screws to produce Ultra Stainless™ providing unprecedented corrosion resistance combined with hardness for drilling.
Marutex® screws are tempered and quenched; regular T-410 self-drilling screws are case hardened. The additional carbon in Marutex® provides hardness for better drilling. /Asset/a1175.jpg
Stamped with Mfr. ID plus "NC" and "F468U"
Chemical and physical reports available upon request at no charge /Asset/1222_head-Cap-Screws.jpg
Stamped with Mfr. ID plus "20"
Chemical and physical reports available upon request at no charge. /Asset/1164_Hex-Cap-Screws.jpg
Chemical and physical reports available upon request at no charge
Manufactured by Robbins Manufacturing Co; inc. /Asset/1167_Hex-Cap-Screws.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
Hexagon and Spline Socket Button Head Cap Screws
(14) General Note:This product is designed and recommended for light fastening applications such as guards, hinges, etc. It is not suggested for use in critical high strength applications where socket head cap screws should normally be used.
Notes:
- Nominal Size. Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
- Head Height. Tabulated head heights represent metal-to-metal measurements
Hexagon and Spline Socket Set Screws
(96)- Nominal Size. Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
- Length. The length of the screw shall be measured overall, parallel to the axis of the screw. The basic length dimension on the product shall be the nominal length expressed as a two-place decimal.
Hexagon Key Engagements for Short Length Set Screws
(120) Caution: The use of short length set screws listed in this table can result in failure of the socket, key, or mating threads during tightening because key engagement and thread length are less than optimum. Therefore, it is strongly recommended that screws of lengths equal to or greater than the lengths specified in Table to be used wherever possible. /Asset/fkeys.jpg Optional Types of Cup Points
(24) Type A point shown in Fig. is the cup point dimensioned in Table. Types B, C, D, E, F, and G are typical variations of the cup point which are supplied by some manufacturers. /Asset/a1095.jpg Hexagon Sockets
(29)- 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.
Spline Sockets
(22)- Applicable socket depths are specified in the dimensional tables and notes for the respective screw types.
- Where spline sockets are chamfered, the depth of chamfer shall not exceed 10 percent of the nominal socket size for sizes up to and including 0.060 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.
- Where both six and four splines are available, six splines will be supplied unless four splines are ordered.
- Broach petals at the bottom of the socket are permissible.
Hexagon Keys and Bits
(29)- 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.
Spline Keys and Bits
(22)- 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.
- Material (Steel Alloy). The spline keys 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 0.372 in., and 45 HRC for sizes over 0.372 in., is met when spline keys are hardened by quenching from the austenitizing temperature and tempered.
- For plated keys, all dimensions are before plating. Because of the high hardness of these products, it is recommended that they not be electroplated.
- Bits are available, but lengths have not been standardized.
- Spline keys shall be furnished as Short Arm Series or Long Arm Series.
- Designation. To promote uniformity and understanding in communications relating to products conforming to this standard, it is recommended that Spline Keys be designated in accordance with the following data, preferably in the sequence shown:
(a) product name
(b) designation of the standard
(c) nominal key size
(d) series
(e) protective finish, if required
Examples:
Spline Key, ASME B18.3, 0.111 Short Arm Series
Spline Key, ASME B18.3, 0.372 Long Arm Series, Nickel Plated
410 Ultra Stainless™ Marutex® Self Drilling Screws
(53) A new kind of stainless alloy combines 410 hardened with a touch of 316 (molybdenum)Marutex® means
1. High hardness for drilling
2. Far superior corrosion resistance
The Special Ingredient in Ultra Stainless™
Marutex® adds 2% molybdenum (moly) to 410 stainless.
Moly is the significant component of 316 stainless that provides extra corrosion resistance.
Now moly is added to 410 self drilling screws to produce Ultra Stainless™ providing unprecedented corrosion resistance combined with hardness for drilling.
Marutex® screws are tempered and quenched; regular T-410 self-drilling screws are case hardened. The additional carbon in Marutex® provides hardness for better drilling. /Asset/a1175.jpg
Nickel Copper 400 Hex Head Cap Screws
(58) Manufactured to MIL-S-1222H amend. 3 and ASTM F468 by Robbins Manufacturing Co., Inc.Stamped with Mfr. ID plus "NC" and "F468U"
Chemical and physical reports available upon request at no charge /Asset/1222_head-Cap-Screws.jpg
Alloy 20 Hex Head Cap Screws
(24) Manufactured by Robins Manufacturing co; Inc.Stamped with Mfr. ID plus "20"
Chemical and physical reports available upon request at no charge. /Asset/1164_Hex-Cap-Screws.jpg
316L - Low Carbon Hex Head Cap Screws
(25) Screws Stamped with Mfr. ID plus "316L"Chemical and physical reports available upon request at no charge
Manufactured by Robbins Manufacturing Co; inc. /Asset/1167_Hex-Cap-Screws.jpg
316 Sheet Metal Screws
(68) Stamped for identification with a dot (•) or "316". /Asset/1177_sheet-metal-screw.JPG 