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Packaged Items
SinglePack of 5
Part NumberTypeMS Dash #Length
AN501-A10-4Fine ThreadMS35266-591/410-32--


All part numbers will follow this format: AN###. To further distinguish between the part numbers, you'll notice that a dash ("-") has been added, followed by some specific variation of more numbers. If there is an "A" after the dash, the part is cadmium plated, Type II, Class 3, with a drilled head. If there is NOT an "A" after the dash, the part is Cadmium plated, Type I.

AN500 (coarse thread) and AN501 (fine thread) slotted fillister head screws are fabricated from carbon steel. Tensile strength 55,000 PSI

AN502 (fine thread) and AN503 (coarse thread) drilled head, slotted fillister head screws are fabricated from steel meeting specification MIL-S-6050. Tensile strength 125,000 PSI. Cadmium plated, Type II Class 3.

California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


Just as advertised.

Rod R
April 23, 2021

My first order was to see if these were correct length(no grind down to fit) for SU Carburetors Suction Chamber screws,This is my 2nd order of these Fillister Head screws as they are better than stock head diameter and of course Safety Wire Drilled !! Wont use anything else on my Carb Rebuilds !!

January 12, 2021

1st order to make sure they were correct for my carb rebuilds !! And they are perfect for 60s era SU Carb resto race look !! Thanx

December 24, 2020

Prefect length for C-85 lower center valve rocker cover when the standard 3/8 length has stripped..

June 5, 2020

a screw is a screw....

F. L
January 17, 2020

shinny news and nicely fits... not too loose, not too tight

Steve E
October 11, 2019

Its astonishing how such a small, inexpensive part as the Maule tail wheel locking spring--a coil about an inch long and less than 1/4 inch in diameter--can affect the performance of an airplane! Aircraft Spruce sent it by first class mail (as I requested) and it arrived in a couple of days. Fits perfectly and easy to install.

Donald M
March 29, 2019

Perfect fit and great finish coating. Pricing was very reasonable.

Robert S
December 21, 2018

I ordered the Maule TW-15A steering arm subassembly. When it arrived, the locking ring had not been machined completely. The lock pin holes were absent and the through hole was undersize. Aircraft spruce was very prompt about helping me diagnose the problem. They sent a replacement immediately and provided a will call tag to return the nonconforming part. I would rate their customer service as top notch.

Chris M
December 15, 2018

Exact fit, went on with no issues. Aircraft Spruce shipped quickly, very adequate package, good price.

Joe M
November 8, 2018


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.

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