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Packaged Items
SinglePack of 5
Dash No.Nominal
AN6C Stainless
AN6C Stainless


Hex head aircraft bolts are made of high-strength type 4037 or 8740 alloy steel (type 8740 is most commonly used). The bolts are centerless 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, and with or without drilled head for safety wire. Specify bolts to have undrilled shank by adding letter "A" after the dash number. For bolts with drilled head add letter "H" after the AN number. See illustrated examples. "C" represents Type 431 Stainless Steel (contains iron which is magnetic). 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 callout.

Note: Drilled bolts listed above are drilled shank only. To order drilled head only or both drilled head and shank bolts, please use our AN Bolt Selector by clicking the link below.

Click here for the AN Bolt Selector

Reference Chart

Reference Chart

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Prop bolts for my airboat.

George F
April 13, 2021


Jerry Z
March 24, 2021

Aircraft Spruce is always a constant, and reliable source for what I need. Products are always of good quality. Shipping, well, I’m sure Aircraft Spruce has little latitude in that area.

Charles M
February 22, 2021

Was able to pick the bolts I needed, showed up perfect!

Zac J
January 4, 2021

Good quality bolt

Blaine W
December 18, 2020

Hey - it’s a bolt! That said, I ckrcked the dimensions and the cad consistency and it was good. Fit my tight fit holes perfectly. If marriages had this level of “fit” there’d be fewer divorces.

December 3, 2020

These are the prettiest AN6H-6A Bolts I have ever seen.

Robert S
November 30, 2020

Great deal, thank you!

Jennifer H
November 5, 2020

Upper Rh engine monut bolt

August 24, 2020

Bolts came very quickly and were packaged very well.

Dennis A
August 14, 2020


Please note, Aircraft Spruce Canada'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 Canada 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: Can you provide an average weight for AN6-7A?

The average weight for quantity 1 of AN6-7A is 0.04 lbs.

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: Do the undrilled AN6 bolts listed here still have a hole through the bolt's head?

No, the undrilled bolts listed here have no holes. To find the bolts with drilled head only, keyword search " AN Bolt Selector " on our website. The first result will be a drop down selection page and you can choose the different drilled options for each bolt we carry.

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: How do I add the H to the part number for a AN6H-30A bolt?

The fastest way to add this bolt to your shopping cart would be to go to the cart screen, and enter it in the area that says "Quick Add to Cart". Just put AN6H-30A in part # box and whatever quantity you want in the quantity box and click add. That particular bolt is not order-able from this page.

Q: Are these FAA PMA replacements or only for homebuilt aircraft?

Hardware does not need FAA Approval. The hardware listed on this page is MIL spec and can be used on certified or homebuilt aircraft.

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.

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