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51A138B325 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

51A138B325: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OVERALL, thickness: 0.038 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN, hole_diameter: 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN, overall_diameter: 0.309 INCHES MINIMUM AND 0.311 INCHES MAXIMUM IN, peripheral_shape_style: ROUND, center_hole_shape_style: ROUND. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-722-5998, 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
51A138B325
NSN: 5310-00-722-5998
NIINs: 007225998, 009582968
FSC: 5310 — Nuts and Washers
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)
SPECIFICATIONS
materialSTEEL COMP 302 OVERALL
thickness0.038 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN
hole_diameter0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
overall_diameter0.309 INCHES MINIMUM AND 0.311 INCHES MAXIMUM IN
peripheral_shape_styleROUND
center_hole_shape_styleROUND
cross-sectional_shape_styleRECTANGULAR
material_document_and_classificationQQ-S-763,COND B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-722-5998
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 51A138B325 · 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
SUBSTITUTES & CROSS-REFERENCES 10
5310PL0730310Reference document
Same NSN cross-reference
Reference document — Informative reference only
5310PL1849343Reference document
Same NSN cross-reference
Reference document — Informative reference only
ASC1538391Reference document
Same NSN cross-reference
Reference document — Secondary reference
010048-805Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
5310PL2198637Reference document
Same NSN cross-reference
Reference document — Informative reference only
4197500-122Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 51A138B325?
51A138B325 is a WASHER,FLAT.
What parts can replace 51A138B325?
There are 10 known substitutes for 51A138B325: 5310PL0730310, 5310PL1849343, ASC1538391 and 7 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 51A138B325?
51A138B325 is cataloged in the U.S. Government catalog under NSN 5310-00-722-5998. 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.