AIA NAS4008

SCOPE AND CLASSES

This Specification defines the requirements for externallythreaded fasteners produced from a corrosion resistant alloy andprocured under part numbers listed on drawings which refer to thisspecification. Typically these fasteners are used for tension,shear, and tension-fatigue applications where 220 KSI Ftu and 125KSI Fsu is desired with a service temperature capability to 900 °F(see Table III and IV).

Requirements stipulated in purchase contracts, purchase orders,part standards and/or part drawings shall take precedence overrequirements stated herein. Receiving contractors may reject anylot which does not conform.

This specification delineates requirements for four differentfastener categories, Type I, Type II, Type III and Type IV. Each ofthese four fastener types incorporates different mechanicalproperties as prescribed in Table III and Table IV and differenthead configurations described as follows:

Type I – External Wrenching Tension Head (double hex,spline)

Type II – External Wrenching Shear Head (double hex, spline)

Type III – 100° Flush Tension Head that specifies an internalwrenching device.

Type IV – 100° Reduced Flush Head that specifies an internalwrenching device.

Workmanship of fasteners shall be in conformance with aircraftfastener manufacturing processes.

Recommendations for improvements or corrections to thisspecification should be directed to an NASC representative of ausing company or to the Executive Secretary of the NationalAerospace Standards Committee.

Specifications listed herein, of the issue in effect on date ofinquiry, are a part of this specification to the extent indicated.In the case of conflict, the requirements herein shall takeprecedence.

Should a using company require qualification testing for anyproduct specifying this document, a report for the specific productand product diameter shall be generated by the product manufacturerfrom product of sufficient shank and thread length to yieldinspection and test data for all requirements in Table I.Inspection and test data shall be generated in accordance with theprescribed test methods, utilizing the sampling plan specified fora twenty-five (25) piece manufacturing lot and submitted by theproduct manufacturer to the product user.

Unless otherwise specified, part inventory manufactured toprevious revisions of the applicable drawing or specification maybe procured and used until stock is depleted.

Edition:

1

Published:

08/31/2012

Number of Pages:

20

File Size:

1 file , 230 KB