Abstract： ASME B18.21.1:1999 pdf download.LOCK WASHERS(INCH SERIES). 2.7 Processing 2.7.1 Finishes. Unless otherwise specified by the purchaser. lock washers shall be supplied with a plain (as processed) finish, not plated or coated. Where corrosion...

ASME B18.21.1:1999 pdf download.LOCK WASHERS(INCH SERIES).

2.7 Processing

2.7.1 Finishes. Unless otherwise specified by the purchaser. lock washers shall be supplied with a plain (as processed) finish, not plated or coated. Where corrosion preventative treatment is required, washers shall be plated or coated as specified by the

purchaser. When helical spring-lock washers are to be furnished with coatings over 0.0005 in. thick and are to be used with bolts

or screws also having thicker coatings. they are to be coiled to limits of 0020 in. in excess of those specified in Tables I

through 4 for minimum inside diameter and maximum outside diameter. Heavy coating of washers under 14 in. nominal size is not

recommended.

2.7.2 EmbrittlemeM. Carbon and boron steel-lock washers that are electroplated or coated may be subject to embrutlement and shall

be suitably treated to minimize such embrittlement. Plated washers shall not fracture after having been compressed flat for a

minimum of 48 hr.

2.8 Workmanship

The hat surfaces (faces) of helical spring-lock washers shall be free from such surface imperfections as knurling, serrations,

die marks, deep scratches, loose scale, burrs. or other irregularities that would affect serviceability. Moderate feed roll marks

shall be permissible on the outer periphery.

2.9 Twist Tests

The washer shall be gripped in vise jaws. The ends of the washer shall be free, and an axis passing through the slot shall be

parallel to and slightly above the top of the vise so less than 50% of the washer is gripped.

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