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503357 — BLOCK,NOZZLE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

503357: BLOCK,NOZZLE.

The BLOCK,NOZZLE is a the manufacturer industrial component. Key specifications include special_features: STYLE DESIGNATOR:NO.60 IRREGULAR SHAPE FROM FIIG A03200, supplementary_features: CROSS-SECTIONAL SHAPE STYLE:NO.195 IRREGULAR SHAPE FROM FIIG A03200. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-050-3357, 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
503357
NSN: 5310-00-050-3357
NIINs: 000503357, 003759570, 012565145
FSC: 5310 — Nuts and Washers
CAGE: 56442 — DIAMOND REO TRUCK CO (USA)
SPECIFICATIONS
special_featuresSTYLE DESIGNATOR:NO.60 IRREGULAR SHAPE FROM FIIG A03200
supplementary_featuresCROSS-SECTIONAL SHAPE STYLE:NO.195 IRREGULAR SHAPE FROM FIIG A03200
NSN5310-00-050-3357
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 503357 · 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
•
WIDTH ACROSS FLATS: 0.625 INCHES NOMINAL IN
•
THREAD SERIES: UNF
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
NUT HEIGHT: 0.453 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.625 INCHES NOMINAL IN
THREAD SERIESUNF
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.438 INCHES IN
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NUT HEIGHT0.453 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
THREAD CLASS3B
THREAD QUANTITY PER INCH20
SUBSTITUTES & CROSS-REFERENCES 4
5310000503357Reference document
Same NSN cross-reference
Reference document — Informative reference only
NU701Reference document
Same NSN cross-reference
Reference document — Secondary reference
360386S7-8Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
Y325Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 503357?
503357 is a BLOCK,NOZZLE.
What parts can replace 503357?
There are 4 known substitutes for 503357: 5310000503357, NU701, 360386S7-8 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 503357?
503357 is cataloged in the U.S. Government catalog under NSN 5310-00-050-3357. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.