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70191-104 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

70191-104: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN, material: STEEL OVERALL, hole_diameter: 0.358 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES BOTTOM, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM, outside_diameter: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-022-0355, 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
70191-104
NSN: 5310-01-022-0355
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
radius0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
materialSTEEL OVERALL
hole_diameter0.358 INCHES MINIMUM AND 0.368 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES BOTTOM
hardness_rating40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
outside_diameter0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
special_featuresCOLOR NATURAL
style_designatorCONCAVE
surface_treatmentNICKEL OR CADMIUM AND CHROMATE OVERALL
material_thickness0.075 INCHES NOMINAL IN
minimum_tensile_strength180000 POUNDS PER SQUARE INCH LBS
specification/standard_data81205-BACW10CA MANUFACTURERS STANDARD
NSN5310-01-022-0355
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 70191-104 · 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 FINISH: 32.0 MICROINCHES BOTTOM
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
RADIUS: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5528 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.075 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES BOTTOM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2416 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
RADIUS0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5528 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.557 INCHES MINIMUM AND 0.567 INCHES MAXIMUM IN
MATERIAL THICKNESS0.075 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA81205-BACW10CA MANUFACTURERS STANDARD
SPECIAL FEATURESCOLOR NATURAL
OTHER ITEMS IN FSC 5310 — Nuts and Washers
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540
SUBSTITUTES & CROSS-REFERENCES 4
BACW10CA104CCSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
K29913-104Reference document
Same NSN cross-reference
Reference document — Secondary reference
K29916-104Reference document
Same NSN cross-reference
Reference document — Secondary reference
942008-4Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 70191-104?
70191-104 is a WASHER,CONCAVE.
What parts can replace 70191-104?
There are 4 known substitutes for 70191-104: BACW10CA104CC, K29913-104, K29916-104 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 70191-104?
70191-104 is cataloged in the U.S. Government catalog under NSN 5310-01-022-0355. 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.