F959M

Designation:F 959M-99aMETRICStandard Specification forCompressible-Washer-Type Direct Tension Indicators forUse With Structural Fasteners [Metric]1This standard is issued under the fixed designation F 959M;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon (e)indicates an editorial change since the last revision or reapproval.1.Scope2.2 Research Council on Structural Connections Standard:1.1 This specifi cation covers the requirements forSpecifi cation for Structural Joints Using ASTM A 325 or Acompressible-washer-type direct tension indicators capable of490 Boltsindicating the achievement of a specified minimum bolt tension2.3 ANSI Standards:6in a structural bolt.B18.2.3.7M Metric Heavy Hex Structural Bolts1.2 Two types of direct tension indicators in nominalB 18.2.3.4.6M Metric Heavy Hex Nutsdiameter sizes M16 through M36 are covered:1.2.1 Tipe 8.8Direct tension indicators for use with3.TerminologySpecif cation A 325M bolts,and3.1 Definitions of Terms Specifc to This Standard:1.2.2 Tipe 10.9-Direct tension indicators for use with3.1.1 compressible-washer-type direct tension indicator-aSpecifi cation A 490M bolts.washer-type element inserted under the bolt head or hardened1.3 Direct tension indicators are intended for installationwasher,having the capability of indicating the achievement ofunder either a bolt head or a hardened washer.(See Appendixa required minimum bolt tension by the degree of direct tensionX1.)indicator plastic deformation.Hereinafter referred to as direct1.4 The following precautionary statement pertains only totension indicator.the test methods portion,Section 12,Annex A1,and Appendix4.Ordering InformationX1 of this specifi cation:This standard does not purport toaddress all of the safety concerns,if any,associated with its4.1 Orders for direct tension indicators under this specifi ca-use.It is the responsibility of the user of this standard totion shall include the following:establish appropriate safety and health practices and deter-4.1.1 Quantity (number of pieces);mine the applicability of regulatory limitations prior to use.4.1.2 Name of product (direct tension indicator),4.1.3 Size,that is,nominal diameter,2.Referenced Documents4.1.4 ASTM designation and year of issue,if not specifi ed,2.1 ASTM Standards:current issue shall be used;A 325M Specifi cation for Structural Bolts,Steel,Heat-4.1.5 Type required,8.8 or 10.9 (see 1.2);Treated,120/105 ksi Minimum Tensile Strength [MetricP4.1.6 Coating type,if required (see 5.4);A 490M Specifi cation for High-Strength Steel Bolts,4.1.7 Source inspection,if required (Section 13);Classes 10.9 and 10.9.3.for Structural Steel Joints [Met-4.1.8 Certifi cates of compliance or test reports,if requiredric]2(Section 15);andA 563 Specifi cation for Carbon and Alloy Steel Nuts24.1.9 Any special requirements.B 695 Specif