AN-NASM Hex Head Machine Bolts
  • AN/NASM 3 Series Steel Cadmium Plated Hex Head Machine Bolt
  • AN-NASM Hex Head Machine Bolts
  • AN/NASM 3 Steel Hex Head Machine Bolt Package

AN/NASM 3 Series Steel Hex Head Machine Bolt SKU: BLT-AN/NASM-3-STHEX

AN Bolts in different series are manufactured to the "Army-Navy" military standard (predecessor to "Mil-Spec" (MS) and "National Aerospace Standard" (NAS) which followed). They can be used for either tensile/shear load applications throughout the aircraft. They are offered in different materials, surface finishes, diameters and lengths (see table below). AN3 through AN20 Series bolts are superseded by NASM3 through 20 Series. The part numbers in both series have not been changed.

They are available in  high-strength type 4037 or 8740 alloy steel and 431 Stainless Steel (CRES) versions with drilled or undrilled shank. AN bolts with undrilled shank are specified by letter "A" after the dash number. AN stainless steel bolts are specified by letter "C".

Diameter (in./")
Length (in./")
Composition
Surface Finish
Drilling
Special Order

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AN hex head bolts are commonly used in aviation applications are manufactured to the "Army-Navy" (AN) military standard, predecessor to "Mil-Spec" (MS) and "National Aerospace Standard" (NAS) which followed. They are available in steel and stainless steel versions with drilled or undrilled shank.

AN steel bolts are made of high-strength type 4037 or 8740 alloy steel, they are centerless ground, threaded after heat treatment and cadmium plated per specification QQ-P-416A, Type II, Class 3 for superior corrosion resistance as compared to commercial grade zinc plated bolts.

AN stainless steel bolts are made of 431 Stainless Steel (CRES) specified by letter "C".

Minimum Tensile Strength (Steel and CRES) - 125,000psi. 

AN bolts are offered with shank drilled for cotter pin or undrilled for stop nut application, and with or without drilled head for safety wire. AN bolts with undrilled shank are specified by letter "A" after the dash number. The length of AN aircraft bolts is measured from under the head to the end of the shank. The "grip" is the unthreaded portion of the shank. Threads are pressed into the steel, not cut, thus maintaining strength throughout the entire shank. The surface under the head of AN bolts is designed to be a bearing surface to reduce non-uniform stress as the bolt is torqued thus reducing premature fatigue. 

Specification Details:

AN3 through AN20 (REV. 12), Military Specification Sheet: Bolt -Machine, Aircraft [superseded by NASM3 through 20]. This specification covers aircraft machine bolts part numbers, AN3, AN4, AN5, AN6, AN7, AN8, AN9, AN10, AN14, AN16, AN17, AN18, and AN20. AN3 THRU AN20  is canceled and superseded by NASM3 THRU NASM20. The Part Identification Number (PIN) for AN3 THRU AN20 REV. 12 and the part number for NASM3 THRU NASM20 are identical. The part numbers have not been changed.

AN/NASM3-3A

Data sheet

Composition
4037/8740 Steel Alloy
Certification/Approval
Certificate of Conformance
Taric
73181500 Screws,Bolts,Nuts,Rivets,Cotters,Cotter-Pins,Washers,Spring Washers etc. from Iron or Steel
Surface Finish
Cadmium
Unit of Measurement (UOM) / Sale
Piece (pc.)

Specific References

upc
73181500
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