ASME B18.2.6-2019 pdf free
ASME B18.2.6-2019 pdf free.Fasteners for Use in Structural Applications.
2 HEAVY HEX STRUCTURAL BOLTS: ASTM F3125/F3125M
2.1 Heavy Hex StructuraL BoLt Dimensions
Bolts shall conform to the dimensions given in Table 2.1-1. Formulas for heavy hex structural bolts are given in
Nonmandatory Appendix A of ASMI 1118.2.1.
2.1.1 Top of Head. Top of head shall be full form and chamfered or rounded with the diameter ofchamfercircle, or start of rounding being equal to the maximum width across flats within a tolerance of —15% of the maximum across flats dimension. The shape of the top of the head may be flat, concave, or convex at the manufacturer’s option. If the shape is concave or convex, head height as described in para. 2.1.4 shall remain within specified limits at lowest or highest points. respectively.
2.1.2 Width Across FLats. The width across flats of heads shall be the distance measured perpendicular to the axis of the overall product between the two opposite sides of the head.
2.1.3 Head Taper. The maximum width across flats shall not be exceeded, No transverse section through the head between 25% and 75% of actual head height, as measured from the bearing surface, shall be less than the minimum width across flats.
2.1.4 Head Height. The head height shall be that overall distance measured parallel to the axis of the product from the top of the head to the bearing surface and shall include the thickness of the washer face. Raised grade and manufacturer’s identification are excluded from head height.
2.1.5 True Position of Head. The head shall be located at true position with respect to the body within a tolerance zone having a diameter equivalent to 6% of the maximum width across flats at maximum material condition (MMC). For measurement purposes, hold the body a distance under the head equal to one diameter.
2.1.6 Bearing Surface. Kearing surface shall be flat and washer faced. however, a die seam across the bearing 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 be not less than 0.015 in. nor greater than 0.025 in. for bolt sizes 34 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 of the bearing surface shall be perpendicular to the axis of the body within the full indicator movement (FIM) limits specified for total runout. Measurement 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 distance 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-ln. length increments.ASME B18.2.6 pdf download.
