1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW3666 Fastener Assembly Aid - Temporary Retaining Element, Preapplied Copyright 2013 General Motors Company All Rights Reserved May 2013 Page 1 of 3 1 Introduction 1.1 Scope. This specification covers the basic requirements for a preapplied te
2、mporary retention element. The primary use of this element is to provide a temporary means of holding parts in position during fabrication, assembly, or transportation. 1.2 Designation. Not applicable. 1.3 Material Description. The retention element in accordance with this specification shall not lo
3、se adhesion or tear loose when the parts are preassembled. The retention element performance and dimensions such as location, length, and diameter or thickness shall be specified on the engineering drawing. 1.4 Typical Applications. The retention element is typically applied to externally threaded f
4、asteners, rivets, pins, plugs, and other insertion type parts. It may also be applied to inside diameters of parts such as nuts and stampings. The product shall be applied 360 degrees on the part unless otherwise specified. The retention element shall form either an interference fit between parts or
5、 provide a positive stop to temporarily hold parts in position for assembly. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW3059 GMW14234 2.3 Additional References. None.
6、 3 Requirements 3.1 Chemical Requirements. 3.1.1 Chemical Resistance. This product must be non-toxic and have moderate resistance to all automotive chemicals such as alcohol, gasoline, engine oils, kerosene, diesel fuel, and hydraulic fluids. 3.1.2 Recyclability. Parts with this material shall not h
7、ave any negative effect on recyclability of the parts. 3.1.3 Mechanical Requirements. The product shall have good adhesion to base material. It shall be dry to the touch and exhibit no flaking prior to initial assembly. 3.1.4 Physical Requirements. 3.1.4.1 Dimensions. Dimensions and coverage are par
8、t and function specific and shall be defined on the engineering drawing. Thickness is typically 0.6 to 1 mm. On a 10 mm outside diameter part, the resulting outside diameter with the retention element would be 11.2 to 12 mm. Length of patch is typically 0.25 times to 1 times the outside diameter wit
9、h a tolerance of 1 mm. Full 360 degree coverage is typical, but 180 degree or less coverage is also possible. 3.1.4.2 Shelf Life. The product must exhibit a shelf life of no less than one (1) year without evidence of deterioration or becoming hard or brittle. 3.1.4.3 Pliability. Items processed in a
10、ccordance with this specification must be pliable enough to allow hand assembly at room temperature. 3.1.5 Insertion/Retention Requirements. Unless otherwise specified on the engineering drawing, the retention element shall meet the requirements of Table 1. Sample size shall be ten (10) minimum. Ins
11、ertion Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3666 Copyright 2013 General Motors Company All Rights Reserved May 2013 Page 2 of
12、3 and retention forces shall be met on an absolute basis. Retention forces shall be measured immediately after insertion. Reference GMW14234 for ergonomic guidelines for new products. Table 1: Insertion/Retention Requirements Thread Size Mating Hole Plate Thickness Maximum Insertion Minimum Retentio
13、n -0.00/+0.03 0.5 M6 7 mm 9.3 mm 100 N 85 N M8 9 mm 9.3 mm 105 N 90 N M10 11 mm 9.3 mm 110 N 95 N M12 13 mm 9.3 mm 195 N 175 N M14 15 mm 9.3 mm 205 N 185 N Figure 1: Patch Example 4 Rules and Regulations 4.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recomm
14、endations valid in the country of usage. 4.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 4.3 Inspection and Rejection. Samples of components or materials released to a GM general specification shall be tested for conformit
15、y with the requirements of this general specification and approved by the responsible Engineering department prior to commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process, location of manufacture, etc. If not otherwise ag
16、reed, all testing and documentation normally required for initial release must be completed. It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and to include documentation of all modifications of materials and/or processes and to apply for a ne
17、w release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. 4.4 Initial
18、Source Approval. No shipments shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engineering department(s) as meeting the requirements of this specification. Copyright General Motors Company Provided by IHS under license with
19、 General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3666 Copyright 2013 General Motors Company All Rights Reserved May 2013 Page 3 of 3 4.5 All materials supplied to this standard must comply with the require
20、ments of GMW3059, Restricted and Reportable Substances for Parts. 5 Notes 5.1 Glossary. Not applicable. 5.2 Acronyms, Abbreviations, and Symbols. OD Outside Diameter 6 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: GMW3666 7 Release and Revisions This
21、 standard was originated in January 2002. It was first approved by Global Fastening Expert Team in August 2008. It was first published in August 2008. Issue Publication Date Description (Organization) 1 AUG 2008 Initial publication. 2 MAY 2013 Five year refresh of standard. Remove from title and tex
22、t all references to “Thermoplastic Expandable Patch”, remove “See 5.2” from paragraph 3.1, add reference to GMW14234 to paragraph 3.1.5, and reformat Table 1. (Global Fastening Expert Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
