ASME B18.21.3-2008 pdf download.Double Coil Helical Spring Lock Washers for Wood Structures.
Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes that appear necessary or desirable, as demonstrated by the experience gained from the application of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Requests for Cases shall provide a Statement of Need and Background Information. The request should identify the standard, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases. Requests for Cases should also indicate the applicable edition(s) of the standard to which the proposed Case applies. Interpretations. Upon request, the B18 Standards Committee will render an interpretation of any requirement of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B18 Standards Committee. The request for an interpretation should be clear and unambiguous. It is further recommended that the inquirer submit his/her request in the following format: Subject: Cite the applicable paragraph number(s) and the topic of the inquiry. Edition: Cite the applicable edition of the Standard for which the interpretation is being requested. Question: Phrase the question as a request for an interpretation of a specific requirement suitable for general understanding and use, not as a request for an approval of a proprietary design or situation.
1 INTRODUCTORY NOTES 1.1 Scope This Standard covers the dimensional and physical properties and methods of testing for double coil helical spring lock washers for wood structures. NOTE: The word lock appearing in the name of the product in this Standard is a generic term historically associated with the product’s identification and is not intended to imply an indefinite permanency of fixity in attachments where the fasteners are used. 1.2 Comparison to ISO Standards No comparable ISO standards exist for this part. 1.3 Dimensions All dimensions in this Standard are in inches and apply to unplated or uncoated product. 1.4 Options Options, if required, shall be agreed upon by the pur- chaser and the manufacturer or distributor. 1.5 Terminology For definitions ofterminology not specifically defined in this Standard, refer to ASME B18.12. 1.6 Referenced Standards Unless otherwise specified, the standards referenced shall be the most recent at the time of the order placement. ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.1, Inspection and Quality Assurance for General Purpose Fasteners ASME B18.21.1, Lock Washers (Inch Series) ASME B18.24, Part Identifying Number (PIN) Code System Standard for B18 Fastener Products Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P.O. Box 2300, Fairfield, NJ 07007-2300 ASTM B 117, Standard Practice for Operating Salt Spray (Fog) Apparatus
1.7 Related Standards Related lock washers and tests are included in ASME B18.21.1. 1.8 Designation Nominal washer sizes are intended for use with com- parable nominal screw, bolt, and/or nut sizes. Fasteners conforming to this Standard shall be designated by the following data and sequence: (a) product name (b) ASME document number (c) nominal size EXAMPLE: Double coil helical spring lock washers for wood structures, ASME B18.21.3, 5 ⁄ 8 in. 1.9 Part Identifying Number For a part identifying number, refer to ASME B18.24. 2 GENERAL DATA 2.1 Application The double coil helical spring lock washers for wood structures covered in this Standard are intended to be used with a curved flat washer or the standard hardware practice of the user against the wood.