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7378340 ✓ 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,RETAINING 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 5310-00-737-8340, 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
7378340
NSN: 5310-00-737-8340
FSC: 5310
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
Part Number7378340
NSN5310-00-737-8340
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 7378340 · 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: STEEL,SAE 1016;2.798 IN. MIN,2.808 IN. MAX OD;2.666 IN. PITCH DIA;2.515 IN. MIN,2.525 IN. MAX ROOT DIA;10 SPLINES;16 TEETH;0.010 IN. MAX RADIUS;1.789 IN. MIN,1.795 IN. MAX BORE DIA AFTER BROACHING SPLINES;1.714 IN. MIN,1.724 IN. MAX DIA BEFORE BROACHING SPLINES;0.165 IN. MIN,0.179 IN. MAX THK IN
TECHNICAL CHARACTERISTICS (FLIS)
GENERAL CHARACTERISTICS ITEM DESCRIPTIONSTEEL,SAE 1016;2.798 IN. MIN,2.808 IN. MAX OD;2.666 IN. PITCH DIA;2.515 IN. MIN,2.525 IN. MAX ROOT DIA;10 SPLINES;16 TEETH;0.010 IN. MAX RADIUS;1.789 IN. MIN,1.795 IN. MAX BORE DIA AFTER BROACHING SPLINES;1.714 IN. MIN,1.724 IN. MAX DIA BEFORE BROACHING SPLINES;0.165 IN. MIN,0.179 IN. MAX THK IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
3439Interchangeable
interchangeable cross-reference
interchangeable
16560Interchangeable
interchangeable cross-reference
interchangeable
F90D163Interchangeable
interchangeable cross-reference
interchangeable
90-4-27-31-LTInterchangeable
interchangeable cross-reference
interchangeable
203-439Interchangeable
interchangeable cross-reference
interchangeable
13027977Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 7378340?
7378340 is a WASHER,RETAINING.
What parts can replace 7378340?
There are 7 known substitutes for 7378340: 3439, 16560, F90D163 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 7378340?
7378340 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-737-8340. 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