Part# AN5H-5


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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Prop bolts for my airboat.

George F
April 13, 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

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

Robert S
November 30, 2020

Good quality

Joe B
May 11, 2020

I used these in a Dana 41 Jeep reared to secure. the ring gear to the carrier. These ring gear are known to work loose, so I used Locktite on them and safety wire through the heads. Worked fantastic.

Justin T
May 4, 2020

Exactly what I wanted delivered promptly.

Norman W
March 30, 2020

Bolts arrived on time.

Gary D
December 5, 2019

I am very happy to get the 8 bolts ,only wish they could have been in stock in Ontario. Still good service.

Wayne K
May 13, 2019

The bolts are fine but is there any way to improve turnaround time? It took 2 1/2 weeks between order and arrival?

June 5, 2020


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?


Q: How do you measure the grip length?

The grip length is the unthreaded portion on the bolt.