Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM F844-19
• Năm ban hành / Publication date: 2019
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Standard Specification for Washers, Steel, Plain (Flat), Unhardened for General Use
• Chỉ số phân loại Quốc tế (ICS) / By field: 21.060.30 - Vòng đệm, chốt
• Số trang / Page: 4

Phạm vi áp dụng / Scope of standard

1.1 This specification covers round and miscellaneous shape steel plain (flat) washers furnished in an unhardened condition.

1.2 These washers are intended for general use bolt, nut, and stud applications to provide increased bearing surface, spacing, and to prevent galling.

1.3 Unless otherwise specified, washers are furnished with dimensions conforming to B18.21.1, Type A, Table 11.

1.4 Hardened washers for use with heat-treated structural bolts are covered by Specifications F436/F436M.

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

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.