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41218K ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,SPECIAL is a the manufacturer industrial component. Key specifications include general_characteristics_item_description: COPPER ALLOY,MIL-B-16541,2.970 IN. OUTSIDE DIA,1.440 IN.

RECESSED DIA,0.500 IN. MIN 0.503 IN. MAX HOLE DIA IN.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-139-9620, indicating validated use in U.S. government and defense logistics supply chains.

Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
41218K
NSN: 5310-01-139-9620
FSC: 5310
CAGE: 86184 — GRISWOLD INDUSTRIES DBA CLA-VAL CO (USA)
SPECIFICATIONS
general_characteristics_item_descriptionCOPPER ALLOY,MIL-B-16541,2.970 IN. OUTSIDE DIA,1.440 IN. RECESSED DIA,0.500 IN. MIN 0.503 IN. MAX HOLE DIA IN
NSN5310-01-139-9620
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 41218K · OEM ⚠ VERIFY BEFORE ORDERING Grade matters for torque spec — don't mix grades. A Grade 5 nut on a Grade 8 bolt weakens the joint. Lock nuts, wing nuts, and castle nuts are NOT interchangeable with standard hex ✓ BROKER TIP Match nut to bolt thread class and material. Stainless bolt + zinc nut = galvanic corrosion. Always verify finish matches (plain, zinc, hot-dip galvanized) PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: COPPER ALLOY,MIL-B-16541,2.970 IN. OUTSIDE DIA,1.440 IN. RECESSED DIA,0.500 IN. MIN 0.503 IN. MAX HOLE DIA IN
TECHNICAL CHARACTERISTICS (FLIS)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONCOPPER ALLOY,MIL-B-16541,2.970 IN. OUTSIDE DIA,1.440 IN. RECESSED DIA,0.500 IN. MIN 0.503 IN. MAX HOLE DIA IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
4-12-18Interchangeable
interchangeable cross-reference
interchangeable
412-6037Interchangeable
interchangeable cross-reference
interchangeable
855885Interchangeable
interchangeable cross-reference
interchangeable
M218NRCE1TX9Interchangeable
interchangeable cross-reference
interchangeable
218WGInterchangeable
interchangeable cross-reference
interchangeable
41236Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 41218K?
41218K is a WASHER,SPECIAL.
What parts can replace 41218K?
There are 17 known substitutes for 41218K: 4-12-18, 412-6037, 855885 and 14 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 41218K?
41218K is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-139-9620. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026