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ASME B18.21.1-2009 pdf download

ASME B18.21.1-2009 pdf download.Washers: Helical Spring-Lock , Tooth Lock , and Plain Washers Inch Series.
1 GENERAL DATA RELATED TO ALL WASHERS 1.1 Scope 1.1.1 This Standard covers the dimensional requirements, physical properties, and related test meth- ods for helical spring-lock washers (# 0 through 3 in.), tooth-lock washers (# 2 through 1%4 in.), and plain wash- ers (# 0 through 3 in.). 1.1.2 The inclusion of dimensional data in this Standard is not intended to imply that all products described are stock production items. Consumers should consult with suppliers concerning the availability of products. NOTE: The word lock appearing in the names of products in this Standard is a generic term historically associated with their identification and is not intended to imply an indefinite perma- nency of fixity in attachments where the fasteners are used. 1.2 Comparison to Iso Standards No comparable ISO standards exist for these parts. 1.3 Types 1.3.1 Helical Spring-Lock Washers. This Standard covers helical spring-lock washers of the following sec- tions: regular, heavy, extra duty, and high-collar. 1.3.2 Tooth-Lock Washers. This Standard covers tooth-lock washers of the following types: internal tooth, external tooth, countersunk external tooth, internal/ external tooth, and of two constructions, designated Types A and B. 1.3.3 Plain Washers. This Standard covers plain (flat) washers of three constructions designated Type A, Type B, and Fender washers. 1.4 Dimensions All dimensions in this Standard are given in inches and are applicable before any coating is applied.
1.6 Terminology For definitions of terms relating to washers or features thereof used in this Standard, refer to ASME B18.12. 1.7 References The following is a list of publications referenced in this Standard. Unless otherwise speified, the latest issue shall apply. ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.2M, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners Engineered Applications ASME B18.24, Part Identifying Number (PIN) Code System Standard Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007 (www.asme.org) ASTM B 99, Standard Specification for Copper-Silicon Alloy Wire for General Applications ASTM B 159, Standard Specification for Phosphor Bronze Wire ASTM B 211, Standard Specification for Aluminum and Aluminum-Alloy Bar, Rod, and Wire ASTM B 591, Standard Specification for Copper-Zinc- Tin and Copper-Zinc-Tin-lron-Nickel Alloys Plate, Sheet, Strip, and Rolled Bar ASTM B 695, Coatings of Zinc Mechanically Deposited on Iron and Steel ASTM E 140, Standard Hardness Conversion Tables for Metals (Relationship Among Brinell Hardness, Vickers Hardness, Rockwell Hardness, Rockwell Superficial Hardness, Knoop Hardness, and Scleroscope Hardness) ASTM F 436, Standard Specification for Hardened Steel Washers ASTM F 844, Standard Specification for Washers, Steel, Plain (Flat), Unhardened for General Use
1.8 Lot For all inspections referenced in this Standard, the lot shall consist of all washers of one type, grade, style, finish, and size fabricated by the same production pro- cess from the same heat number of metal as provided by the metal manufacturer, and submitted for inspection and testing at the same time. The maximum lot size shall be restricted to one shift of production. 1.8.1 Unless otherwise specified by the purchaser, unhardened plain washers (see para. 1.3.3) do not require lot control or heat control and are not subject to the maximum lot size requirement. NOTE: It is common to produce unhardened plain washers from scrap steel that does not normally have material heat traceability. 1.9 Inspection and Quality Assurance Unless otherwise specified, acceptability of this Standard shall be evaluated in accordance with ASME B18.18.2. 2 GENERAL DATA FOR HELICAL SPRING-LOCK WASHERS 2.1 Application: Helical Spring-Lock Washers The helical spring-lock washers covered in this Standard are intended for general applications. Helical spring-lock washers compensate for developed loose- ness between component parts of an assembly, and pro- vide a hardened bearing surface. 2.2 Dimensions: Helical Spring-Lock Washers The dimensions of regular, extra duty, and high-collar helical spring-lock washers shall be specified in Tables 1 through 4. Selection should be made from the regular, heavy, extra duty, or high-collar series in Tables 1, 2, 3, and 4, respectively, to suit design requirements.

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