ASME B18.2.1:2012 pdf free download

ASME B18.2.1:2012 pdf free download.Square, Hex, Heavy Hex，and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series).
2 GENERAL DATA FOR BOTh BOLTS AND SCREWS
2.1 Heads
2.1.1 Top of Head. Top of head shall be full form and chamfen.d, with the diameter of chamfer circle equal to the maximum width across fiats, on square or hex head products and the “B” dimension shown in Table 9 for lobed head screws with a tolerance of —15%.
2.1.2 WIdth Across Flats. The width across flats of head shall be the overall distance measured perpendicular 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 th 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 fiats 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 scre 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 measured 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 boils and lag screws an, permitted to have d,e scams on their body that ececd the body diameter. Ote seams on the body and all other styles of screws thai exceed the body diameter are not permitted.
(2) For recommended clearance of hole sites for bolts and screws, refer to ASME Bl02.8.