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AN Bolt Selector

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Overview

Hex head aircraft bolts are made of high-strength type 4037 or 8740 alloy steel (type 8740 is most commonly used). The bolts are center-less ground and threaded after heat treatment. Minimum tensile strength 125,000 PSI. Cadmium plated per specification QQ-P-416A, Type II, Class 3. Available with shank drilled for cotter pin or undrilled for stop nut application, & with or without drilled head for safety wire. Specify bolts to have undrilled shank by adding letter "A" after dash number. For bolts with drilled head add letter "H" after AN number. See illustrated examples. 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. See table for conversion of length and/or grip to proper AN call-out.

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Reviews

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David W Verified Purchase

AN BOLT AN5H-26A
July 20, 2023

As usual, top quality hardware.

Marty T Verified Purchase

BOLT UNDRILLED AN3-12A
July 15, 2023

Just the right size for my 3-3/4 thick propeller plus crush plate.

John B Verified Purchase

AN6H-32A DRILLED HEAD BOLT
July 12, 2023

An excellent transaction

Ronald V Verified Purchase

BOLT UNDRILLED AN3-17A
July 8, 2023

An esdelent transaction

Ronald V Verified Purchase

BOLT UNDRILLED AN3-16A
July 8, 2023

No problems

John B Verified Purchase

BOLT DRILLED AN6-37
July 7, 2023

I ordered too long - but otherwise they are fine...

John B Verified Purchase

AN BOLT AN6H-34A
July 7, 2023

Dennis L Verified Purchase

BOLT UNDRILLED AN3-26A
July 3, 2023

Dennis L Verified Purchase

BOLT UNDRILLED AN3-27A
July 3, 2023

Aircraft Spruce has asked me to review these AN6H -41a bolts, normally I would not, but I have more than 40 years working with an bolts and feel comfortable reviewing them. The bolts arrived from USPS in good shape, each bolt on a sealed ,identified bag. Close visual inspection revealed 2 different colors of gold cad finish with no thin or missing sections. The rolled threads on all bolts were smooth with no burrs . I then proceeded to measure the bolts for critical dimensions. The diameter of all was 0.3735 +/- 0.0001 . The measured length was within 0.005 .The head diameter was measured at 0.561 +/- 0.003. The saftey wire hole was 0.070 and was perpendicular to the bolt axis. These bolts cost $10 each, but I feel the quality makes it worth the price.

Jonathan M Verified Purchase

AN BOLT DRILLED HEAD AN6H-41A
June 23, 2023

Q&A

Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What is the diameter tolerance on a 3/8-24 AN bolt?

The max is .374", and min .371"

Q: What is the safety wire diameter recommended for the drilled version?

It depends on the application, but both .032 and .041 will fit through the hole.

Q: On a drilled shank, where is the hole located in reference to the end?

Per the Tech Data Sheet, the hole location is determined from the start of the threads, on the head side, to the center of the drilled hole. AN3 = 17/64", AN4 = 5/16", AN5 = 23/64", AN6 = 7/16", AN7 = 31/64", AN8 = 39/64".

Q: What is the difference between stainless and cadmium plated AN bolts?

Stainless bolts are corrosion resistant for applications where corrosion is a problem. CAD plated bolts are made of steel with CAD plating to help surface corrosion, but it can been worn or chipped off.

Q: Is the nominal length listed the entire bolt (head, grip and thread) or just the grip and thread?

The nominal length is the length from under the head to the end of the shank.

Q: Picture clearly shows a bolt with both head drilled and shank drilled, but bolt selector does not allow that choice?

We do offer all of the types shown, but unfortunately not in every size. For example, drilled head is not available in AN4-3 stainless, but is available in AN5-4 cadmium.

Q: For the drilled shank, what is diameter of the drilled hole on AN3?

It is drilled for 1/16" cotter pin so it will be slightly larger than 1/16".

Q: what is the diameter of an4 bolt?

1/4

Q: How do you measure the grip length?

The grip length is the unthreaded portion on the bolt.

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