Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: AASHTO M 293:2010
• Năm ban hành / Publication date: 2010
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Specification for Hardened Steel Washers
• Thay thế cho / Replace: AASHTO M 293:2006
• Số trang / Page: 7

Phạm vi áp dụng / Scope of standard

This specification covers the chemical, mechanical, and
dimensional requirements for hardened steel washers for use with
fasteners having nominal thread diameters of ¼through 4 in. These
washers are intended for general-purpose mechanical and structural
use with bolts, nuts, studs, and other internally and externally
threaded fasteners. These washers are suitable for use with
fasteners covered in Specifications A325, A354, A449, and A490.

The washers are designated by type denoting the
material and by style denoting the shape.

The types of washers covered are:

Type 1-Carbon steel.

Type 3-Weathering steel. Atmospheric corrosion
resistance and weathering characteristics are comparable to that of
steels covered in Specifications A588/A588M and A709/A709M. The
atmospheric corrosion resistance of these steels is substantially
better than that of carbon steel with or without copper addition.
See 5.1. When properly exposed to the atmosphere, these steels can
be used bare (uncoated) for many applications.

The styles of washers covered are:

Circular-Circular washers in nominal bolt sizes 1⁄4
through 4 in. suitable for applications where sufficient space
exists and angularity permits.

Beveled-Beveled washers are square or rectangular, in
nominal sizes ½through 1½ in., with a beveled 1 to 6 ratio surface
for use with American standard beams and channels

Clipped-Clipped washers are circular or beveled for use
where space limitations necessitate that one side be clipped.

Extra Thick-Extra thick washers are circular washers in
nominal sizes ½ through 1½ in., with a nominal thickness of
⁵⁄₁₆ in. suitable for structural applications
with oversized holes.

Terms used in this specification are defined in Terminology
F1789 unless otherwise defined herein.

The values stated in inch-pound units are to be regarded as
standard. No other units of measurement are included in this
standard.

NOTE 1-A complete metric companion to Specification F436 has
been developed-Specification F1136; therefore no metric equivalents
are presented in this specification.

This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.

*A Summary of Changes section appears at the end of this
standard.