Abstract： ASME B18.2.1:2012 pdf download.Square, Hex,HeavyHex, and Askew HeadBolts and Hex, HeavyHex, Hex Flange, Lobed Head, and LagScrews (Inch Series). 2 GENERAL DATA FOR BOTH BOLTS AND SCREWS 2.1 Heads 2.1.1 Top of Head. Top of head shall he full...

ASME B18.2.1:2012 pdf download.Square, Hex,HeavyHex, and Askew HeadBolts and Hex, HeavyHex, Hex Flange, Lobed Head, and LagScrews (Inch Series).

2 GENERAL DATA FOR BOTH BOLTS AND SCREWS

2.1 Heads

2.1.1 Top of Head. Top of head shall he full loran and chamfered, with the diameter of chamfer circle equal to the maxunuin width

acnsa flats, on square or hex head products and the ‘fl dimension shown in lahle 9 for lobed head screws with a tL}lerance of —15%.

2.1.2 WIdth Across Flats. The width aci flats of head shall be the overall distance me&sured 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 the overall distance measured parallel to the axis of product from the top of the head to the bearing surface and shall indude the thickness of the washer face wheat pnnidest

2.1.4 True Position of Head. 11w 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 hum under the head

and rotating the part With the indicator In lane with the asia of the bolt or screw, find and record the lowest point on each flat or the highest po.nt on each lobe. The true pesitlon Is one-half of the laigest 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 (rum the hearing 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 di4aanetcr 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-sire body.

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