WASHER NAS391B6P / 601-6 39106C

Packaged Items
SinglePack of 50
TypeScrew or Bolt SizePNPrice
for 100


82 finishing washers are used in non-structural interior and upholstery applications. The parts covered by NAS390 & NAS391 are getting harder to procure and do not necessarily conform exactly to all of the dimensions stated on the specs.

Brass, nickel plated.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -

  • Frequently Purchased With
  • Customers Also Viewed


Best place for best selection of hardware.

Steven W Verified Purchase

WASHER NAS391B6P / 601-6 39106C (PACK OF 50)

May 24, 2023

Work good and look good

Keeton A Verified Purchase

WASHER NAS391B6P / 601-6 39106C

December 2, 2021

I used this on a carbon fiber panel where I needed the surface area to hold the part and a clean finish (no fastner head to get hung up). Used in conjunction with Phillip head machine screws.

March 19, 2020

Great quality hardware at the right price

November 5, 2019


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: Regarding Part # NAS391B4P: What is the metal? Stainless? nickel plated steel, plastic , brass?

Part # NAS391B4P is brass.

Q: You say part #391B4P is brass. The photos show this to be chrome or nickel plated? Are they chrome plated brass or brass colored?

They are nickel plated brass, the photo is accurate. They look polished like in the photos.

Q: what is the difference between countersunk and flush?

Countersunk sits proud of the surface but the screw will countersink into the washer. Flush would be flush with the surface.

Q: what is the OD of the 04-03897?

This measures to 0.467".

View in Catalog

View Image View in Catalog