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Part# 04-03877
MFR Model# NL 3/8
Bolt SizeDescriptionPart Number
3/8"Nord-Lock Carbon Steel Washer NL 3/804-03877


The Nord-LockŪ system consists of a pair of washers with a wedge-locking action, which is a unique method that uses tension instead of friction. It is a high quality product with documented success in many industries worldwide, and is the washer utilized by a broad range of propeller manufacturers.

Nord-Lock wedge lock washers have been rigorously tested and approved by independent institutes as well as certification authorities. Nord-Lock wedge lock washers are used in numerous industries such as aviation, energy, transportation, offshore, mining and quarrying, construction and bridge building, manufacturing and processing, ship building, forestry and agriculture, heavy vehicles, and military. Our washers are approved by several industry standards and specified by numerous international companies. Over the operational life cycle, Nord-Lock wedge lock washers give increased operational reliability and lower maintenance costs while significantly reducing the risks of production stops, accidents and warranty claims.

All Nord-Lock washers manufactured are laser marked with the Nord-Lock brand name, control number and a type code for increased traceability and to facilitate authentication.

Note: SP Washers feature an Enlarged O.D. for use on large / slotted holes, painted / sensitive surfaces, or soft materials.

California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


These puppies work!

April 28, 2021

Incredible grip strength.

January 21, 2021

Nice to find true locking washers great product

Michael L
January 6, 2021

Really like the Nordic lock washers

Michael L
December 29, 2020

I love nord-lock washers, they are great at keeping bolts in on my race car despite the vibrations you get from the race track.

Ryan P
May 8, 2020

Needed this for attaching brake calipers. Had removed the bolts a couple of times, did not want to take a chance on failure. Arrived promptly and work.

Alan E
July 16, 2019

Person was great in assisting with ordering and shipping and the product works perfectly.

Dan H
July 2, 2019

Excellent product, works great.

Tim O
July 7, 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.

Q: Are these Nordloc washers sold as a set so if I needed for ten bolts I would order 10?

Yes, Nord-Lock washers are sold as a set. For ten bolts, you would order quantity 10 of the correct size Nord-Lock washers.

Q: What is the thickness of a pair of 04-03875 (5/16 NL8). Are a pair of 04-03876 (5/16 NL8 sp) the same thickness?

The 04-03875 3/32" thick, and 04-03876 is the same.

Q: What is the O.D. of the 04-03876?

The OD is 0.655".

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