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ASME B18.2.1-2012 pdf download

ASME B18.2.1-2012 pdf download.Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series).
ASME B1 .3, Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) ASME B1 8.2.6, Fasteners for Use in Structural Applications ASME B1 8.2.8, Clearance Holes for Bolts, Screws, and Studs ASME B1 8.2.9, Straightness Gage and Gaging for Bolts and Screws Kingman Road, Fort Belvoir, VA 22060-6221 (www.dla.mil) SAE J429, Mechanical and Material Requirements for Externally Threaded Fasteners Publisher: Society of Automotive Engineers (SAE International), 400 Commonwealth Drive, Warrendale, PA 1 5096 (www.sae.org) ASME B1 8.1 2, Glossary of Terms for Mechanical 2 GENERAL DATA FOR BOTH BOLTS AND SCREWS Fasteners ASME B1 8.1 8, Quality Assurance for Fasteners ASME B1 8.24, Part Identifying Number (PIN) Code System for B1 8 Fastener Products ASME B94.1 1 M, Twist Drills ASME Y1 4.5, Dimensioning and Tolerancing Publisher: The American Society of Mechanical Engineers (ASME), Two Park Avenue, New York, NY 1 0016-5990; Order Department: 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900 (www.asme.org) ASTM A1 93, Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High Temperature or High Pressure Service and Other Special Purpose Applications ASTM A307, Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength ASTM A320, Standard Specification for Alloy-Steel and Stainless Steel Bolting for Low-Temperature Service ASTM A354, Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners ASTM A449, Standard Specification for Hex Cap Screws, Bolts and Studs, Steel, Heat Treated, 1 20/1 05/90 ksi Minimum Tensile Strength, General Use ASTM F468, Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use ASTM F593, Standard Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs ASTM F788/F788M, Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series ASTM F1 941 , Standard Specification for Electrodeposited Coatings on Threaded Fasteners [Unified Inch Screw Threads (UN/UNR)] Publisher: American Society for Testing and Materials (ASTM International), 1 00 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 1 9428-2959 (www.astm.org) MIL-F-1 8240, Fastener Element, Self-Locking, Threaded Fastener, 250°F Maximum MS1 5981 , Fasteners, Externally Threaded, Self-Locking, Design and Usage Limitations for Publisher: Department of Defense, Defense Logistics Agency, Andrew T. McNamara Building, 8725 John J. 2 2.1 Heads 2.1.1 Top of Head. Top of head shall be full form and chamfered, with the diameter of chamfer circle equal to the maximum width across flats, on square or hex head products and the “B” dimension shown in Table 9 for lobed head screws with a tolerance of − 1 5%. 2.1.2 Width Across Flats. The width across flats of head shall be the overall distance measured perpendicu- lar to the axis of product between two opposite sides of the head in accordance with the notes in respective dimensional tables. 2.1.3 Head Height. The head height shall be the overall distance measured parallel to the axis of product from the top of the head to the bearing surface and shall include the thickness of the washer face where provided. 2.1.4 True Position of Head. The true position of the head shall be no greater than 6% of the maximum width across flats or lobes. For referee purposes, the evaluation shall be made by holding the body in a collet or chuck one bolt diameter from under the head and rotating the part. With the indicator in line with the axis of the bolt or screw, find and record the lowest point on each flat or the highest point on each lobe. The true position is one-half of the largest absolute difference between the high and low values for any opposing set of flats or lobes. 2.2 Bolt or Screw Length The bolt or screw length shall be the distance mea- sured parallel to the axis of product from the bearing surface of the head to the extreme end of the bolt or screw, including the point if the product is pointed. 2.3 Body Diameter The body diameter minimum/maximum limits are defined in each of the respective applicable tables. Unless otherwise specified by the purchaser, the body style supplied shall be full-size body. NOTES: (1 ) Only bolts and lag screws are permitted to have die seams on their body that exceed the body diameter. Die seams on the body and all other styles of screws that exceed the body diame- ter are not permitted. (2) For recommended clearance of hole sizes for bolts and screws, refer to ASME B1 8.2.8.

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