ASME B18.2.6-2010 pdf download.Fasteners for Use in Structural Applications.
1 INTRODUCTORY NOTES 1.1 Scope 1.1.1 This Standard covers the complete general and dimensional data for five products in the inch series recognized as an American National Standard. These five structural products include (a) Heavy Hex Structural Bolts: ASTM A 325 and ASTM A 490 (b) Heavy Hex Nuts: ASTM A 563 and ASTM A 194 (c) Hardened Steel Washers; Circular, Circular Clipped, and Beveled: ASTM F 436 (d) Compressible Washer-Type Direct Tension Indicators: ASTM F 959 (e) Twist-Off-Type Tension Control Structural Bolts: Heavy Hex and Round: ASTM F 1852 and ASTM F 2280 1.1.2 The inclusion of dimensional data in this Standard is not intended to imply that all products described herein are stock production sizes. Consumers should consult with suppliers concerning lists of avail- able stock production sizes. 1.2 Dimensions All dimensions in this Standard are in inches, unless stated otherwise, and apply to an unplated or uncoated product. When plating or coating is specified, the fin- ished product dimensions shall be as agreed upon between supplier and purchaser. Symbols specifying geometric characteristics are inaccord withASME Y14.5. 1.3 Options Options, where specified, shall be at the discretion of the supplier, unless otherwise agreed upon by the purchaser with the manufacturer or distributor. 1.4 Terminology For definitions of terms relating to fastener dimen- sional or component features used in this Standard, refer to ASME B18.12. 1.5 Referenced Standards Unless otherwise specified, the referenced Standard shall be the most recent issue at the time of order place- ment. The following is a list of publications referenced in this Standard. ASME B1.1, Unified Inch Screw Threads (UN and UNR Thread Form)
ASME B1.2, Gages and Gaging for Unified Inch Screw Threads ASME B1.3, Screw Thread Gaging Systems for Dimensional Acceptability — Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) ASME B18.2.1, Square and Hex Bolts and Screws (Inch Series) ASME B18.2.2, Square and Hex Nuts (Inch Series) ASME B18.2.9, Straightness Gage and Gaging for Bolts and Screws ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.2, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners ASME B18.24, Part Identifying Number (PIN) Code System Standard for B18 Fastener Products ASME Y14.5, Dimensioning and Tolerancing Publisher: The American Society of Mechanical Engi- neers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 (www.asme.org) ASTM A 194/A 194M, Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service or Both ASTM A 325, Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength ASTM A 490, Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength ASTM A 563M, Carbon and Alloy Steel Nuts [Metric] ASTM B 695, Coatings of Zinc Mechanically Deposited on Iron and Steel ASTM F 436, Hardened Steel Washers ASTM F 788/F 788M, Surface Discontinuities of Bolts, Screws, and Studs ASTM F 812/F 812M, Surface Discontinuities of Nuts, Inch and Metric
2.1.6 Bearing Surface. Bearing surface shall be flat and washer faced. However, a die seam across the bear- ing face shall be permissible. Diameter of washer face shall be equal to the maximum width across flats within a tolerance of −10%. Thickness of the washer face shall not be less than 0.015 in., nor greater than 0.025 in. for bolt sizes 3 ⁄ 4 in. and smaller, and not less than 0.015 in. nor greater than 0.035 in. for sizes larger than 3 ⁄ 4 in. The plane ofthe bearing surface shall be perpendicular to the axis of the body within the full indicator move- ment (FIM) limits specified for total runout. Measure- ment of FIM shall extend as close to the periphery of the bearing surface as possible while the bolt is being held in a collet or other gripping device at a distance of one bolt diameter from the underside of the head. The angularity measurement shall be taken at a location to avoid interference from a die seam. 2.1.7 Bolt Length. The bolt length shall be the dis- tance measured parallel to the axis of the product from the bearing surface of the head to the extreme end of the bolt including point. Bolts are normally furnished in 1 ⁄ 4 in. length increments.