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AN961-6 — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

AN961-6: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 270 OR COPPER ALLOY 268 OVERALL, thickness: 0.022 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN, hole_diameter: 0.139 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN, overall_diameter: 0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN, precious_material: SILVER, surface_treatment: SILVER OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-194-0634, 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
AN961-6
NSN: 5310-00-194-0634
NIINs: 001940634, 002458802
FSC: 5310 — Nuts and Washers
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialCOPPER ALLOY 270 OR COPPER ALLOY 268 OVERALL
thickness0.022 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN
hole_diameter0.139 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN
overall_diameter0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
precious_materialSILVER
surface_treatmentSILVER OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationMRAP RG-31
cross-sectional_shape_styleRECTANGULAR
precious_material_and_locationOVERALL SILVER
material_document_and_classificationQQ-W-321 1/2 HARD FED SPEC 1ST MATERIAL RESPONSE OR QQ-B-626 1/2 HARD FED SPEC 2ND MATERIAL RESPONSE OVERALL
NSN5310-00-194-0634
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AN961-6 · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-T-10727 MIL SPEC 1ST TREATMENT RESPONSE OR QQ-S-365,GRADE B FED SPEC 2ND TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SURFACE TREATMENT: TIN OR SILVER OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
•
MATERIAL: COPPER ALLOY 642 OVERALL
•
CENTER HOLE SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-T-10727 MIL SPEC 1ST TREATMENT RESPONSE OR QQ-S-365,GRADE B FED SPEC 2ND TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.370 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-W-321 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SURFACE TREATMENTTIN OR SILVER OVERALL
PERIPHERAL SHAPE STYLEROUND
MATERIALCOPPER ALLOY 642 OVERALL
CENTER HOLE SHAPE STYLEROUND
HOLE DIAMETER0.139 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN
THICKNESS0.022 INCHES MINIMUM AND 0.042 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 6
541021Reference document
Same NSN cross-reference
Reference document — Secondary reference
4197412-003Reference document
Same NSN cross-reference
Reference document — Secondary reference
S124682-1-4-1Reference document
Same NSN cross-reference
Reference document — Secondary reference
8168222Reference document
Same NSN cross-reference
Reference document — Secondary reference
806182Reference document
Same NSN cross-reference
Reference document — Secondary reference
5310001940634Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is AN961-6?
AN961-6 is a WASHER,FLAT.
What parts can replace AN961-6?
There are 6 known substitutes for AN961-6: 541021, 4197412-003, S124682-1-4-1 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN961-6?
AN961-6 is cataloged in the U.S. Government catalog under NSN 5310-00-194-0634. This indicates validated use in U.S. government and defense supply chains.
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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.