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PartsTable / COMPONENT / 4381-11
4381-11 ✓ 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 IMPELLER,PUMP,CENTRIFUGAL is a the manufacturer industrial component. Key specifications include special_features: END ITEM:WATER PUMP. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-136-7505, 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
4381-11
NSN: 5315-01-136-7505
FSC: 5315
CAGE: 89256 — NAVAL SHIP ENGINEERING CENTER PHILADELPHIA DIV (USA)
SPECIFICATIONS
special_featuresEND ITEM:WATER PUMP
NSN5315-01-136-7505
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 4381-11 · 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
•
HOLE ARRANGEMENT STYLE: ONE END DRILLED
•
SHOULDER DIAMETER: 0.844 INCHES NOMINAL IN
•
INTERNAL DRIVE STYLE: CROSS RECESS TYPE II
•
FIRST END STYLE: SQUARE
•
SURFACE FINISH: 20.0 MICROINCHES SHOULDER END
•
HARDNESS RATING: 58.0 ROCKWELL C MINIMUM OVERALL
•
SECOND SHANK DIAMETER: 0.343 INCHES NOMINAL IN
•
THREAD SERIES DESIGNATOR: UNEF
TECHNICAL CHARACTERISTICS (FLIS)
HOLE ARRANGEMENT STYLEONE END DRILLED
SHOULDER DIAMETER0.844 INCHES NOMINAL IN
INTERNAL DRIVE STYLECROSS RECESS TYPE II
FIRST END STYLESQUARE
SURFACE FINISH20.0 MICROINCHES SHOULDER END
HARDNESS RATING58.0 ROCKWELL C MINIMUM OVERALL
SECOND SHANK DIAMETER0.343 INCHES NOMINAL IN
THREAD SERIES DESIGNATORUNEF
SPECIAL FEATURES0.375 IN. W SQUARE END IN
NOMINAL THREAD SIZE0.688 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
421301-1Interchangeable
interchangeable cross-reference
interchangeable
421301Interchangeable
interchangeable cross-reference
interchangeable
5920PL0647905Interchangeable
interchangeable cross-reference
interchangeable
S222002Interchangeable
interchangeable cross-reference
interchangeable
GE8421-3Interchangeable
interchangeable cross-reference
interchangeable
AN121504Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 4381-11?
4381-11 is a IMPELLER,PUMP,CENTRIFUGAL.
What parts can replace 4381-11?
There are 21 known substitutes for 4381-11: 421301-1, 421301, 5920PL0647905 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 4381-11?
4381-11 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-136-7505. 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