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Fastener & Gasket


Standard specification and technical requirements for bolts, nuts, washers, screws, and gaskets, etc.

ASME B18.2.1 Lag Screws

Technical Drawing A lag screw is usually a heavy self-tapping screw with a square or hexagonal head that is driven in with a wrench. ASME B18.2.1 has specified both square lag screw and hex lag screw in full-diameter body or reduced-diameter body. As illustrated in Figure-a & Figure-c, the lag screw shall be furnished with an approximate 60°-angle gimlet end …

ASME B18.2.1 Lobed Head Screws

Technical Drawing ASME B18.2.1 has specified (external) lobed head screws in nominal sizes 1/4″ through 1-3/8″. The nominal sizes also indicate basic major diameter of the thread. Similar to the hex flange screw, a lobed head screw shall be formed as one piece but is constructed in three sections: externally lobed head, flange, and thread rod. The flange section works …

ASME B18.2.1 Hex Flange Screw

Technical Drawing The ASME B18.2.1 hex flange screw is constructed in three sections including a hexagonal head, a disc-like flange, and a threaded rod. It has same tightening function as that of a common hex cap screw plus a washer. Due to the extensive contact surface between the flange and the work piece, the better tightening can be assured. The …

ASME B18.2.1 Heavy Hex Screw

Technical Drawing The ASME B18.2.1 heavy hex screw is manufactured in the same style as the hex cap screw, except that it is more robust. The basic dimensions include E: body diameter; H: head height; F: width across flats; G: width across corners; LT: nominal thread length for screw lengths; J: minimum wrenching height. Dimensions & Weight Calculation *All dimensions …

ASME B18.2.1 Hex Cap Screw

Technical Drawing The hex cap screw, manufactured in accordance with the ASME B18.2.1, is the most classic screw with a hexagonal head. It can fit an pre-tapped hole without using a nut. The basic dimensions include E: body diameter; H: head height; F: width across flats; G: width across corners; LT: nominal thread length for screw lengths; J: minimum wrenching …

ASME B18.2.1 Askew Head Bolt

General Introduction & Technical Drawing Shijiazhuang Metalsin supplies askew head bolts manufactured in accordance with ASME B18.2.1. The askew head bolt, evolving from square head bolt, is primarily used in conjunction with embedded wedge insert in structural construction. It has an angle of bearing surface with respect to shank to mate with the slope of the wedge insert. Askew head …

ASME B18.2.1 Heavy Hex Bolt

Features, Weight Calculation & Technical Drawing Heavy hex bolt manufactured in accordance with ASME B18.2.1 has a larger hex head than that of a standard hex bolt. The body diameter and head height of a heavy hex bolt are the same as that of a standard hex bolt. Two dimensional differences distinguish a heavy hex bolt from a standard hex …

ASME B18.2.1 Hex Bolt

Characteristics, Drawing, Designations & Weights The hex bolt manufactured in accordance with ASME B18.2.1 has taken dominance in headed style bolt. It is one of the most widely applied head styles which has a hexagonal head from the top view. Compared to square head bolt, the six-sided head of hex bolt requires smaller tightening angle of each stroke hence may …

ASME B18.2.1 Square Head Bolt

Technical Drawing, Designations & Weights The square head bolt has a square style head, the top of which is fully chamfered with the diameter of chamfer circle equal to the maximum width across flats, F. Compared to hex bolt, the square head bolt is not so prevalent in modern engineering. It is usually required during refurbishment of old project. The …

ASME B18.2.1 Bolts and Screws

ASME B18.2.1 is the standard specification covering the dimensional requirements for nine products types of inch series bolts and screws recognized as American National Standard. All dimensions of bolts and screws conforming to this standard are in inches and apply to unplated and uncoated product. When plating or coating is specified, the finished product dimensions shall be as agreed upon …

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