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Technical Data Sheet
PartsTable / COMPONENT / 91638550
91638550 ✓ 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,FLAT is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-330-5807, 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
91638550
NSN: 5310-01-330-5807
FSC: 5310
CAGE: F6481 — THALES SA (FRA)
SPECIFICATIONS
Part Number91638550
NSN5310-01-330-5807
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 91638550 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 5
2626-2Interchangeable
interchangeable cross-reference
interchangeable
DMS 85061BInterchangeable
interchangeable cross-reference
interchangeable
AP26262Interchangeable
interchangeable cross-reference
interchangeable
992A301Interchangeable
interchangeable cross-reference
interchangeable
1001404Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 91638550?
91638550 is a WASHER,FLAT.
What parts can replace 91638550?
There are 5 known substitutes for 91638550: 2626-2, DMS 85061B, AP26262 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 91638550?
91638550 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-330-5807. 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