AIA NAS4004

SCOPE AND CLASSES 

This specification defines the requirements for titanium alloyexternally threaded fasteners procured under part numbers listed ondrawings which refer to this specification. Typically thesefasteners are used for tension, shear, and tension-fatigueapplications where 160 KSI Ftu and 95 KSI Fsu is desired with aservice temperature capability to 450 °F. 

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.

The specification includes mechanical property requirements forthree classes of fasteners, Types I, II and III.

Type I – Tension head (hex, double hex, etc.) without a recessdrive, long thread (i.e. NAS6803-6820)

Type II – Tension head (hex, double hex, etc.) without a recessdrive, short thread, (i.e. NAS6403-6420) 100°

Full flush head, long or short thread (i.e. NAS1580V)

Pan head, long or short thread (i.e. NAS1578V)

Fillister head, long or short thread (i.e. NAS1121V-1128V)

Full thread (threaded to the head) (i.e. NAS1101V)

Type III -100° Reduced flush head, long or short thread (i.e.NAS1581) 

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 includingtests categorized as not mandatory. Inspection and test data shallbe generated in accordance with the prescribed test methods,utilizing the sampling plan specified for a twenty-five (25) piecemanufacturing lot and submitted by the product manufacturer to theproduct user. 

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

Edition:

15

Published:

03/31/2015

Number of Pages:

21

File Size:

1 file , 280 KB