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70188-104 — WASHER,CONVEX

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

70188-104: WASHER,CONVEX.

The WASHER,CONVEX is a the manufacturer industrial component. Key specifications include material: STEEL COMP 630 OR STEEL COMP 631 OVERALL, hole_diameter: 0.260 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES BOTTOM, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM, outside_diameter: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN, special_features: COLOR NATURAL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-022-5618, 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
70188-104
NSN: 5310-01-022-5618
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)
SPECIFICATIONS
materialSTEEL COMP 630 OR STEEL COMP 631 OVERALL
hole_diameter0.260 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN
surface_finish32.0 MICROINCHES BOTTOM
hardness_rating40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
outside_diameter0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
special_featuresCOLOR NATURAL
style_designatorCONVEX
surface_treatmentLEAD OVERALL
material_thickness0.072 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN
specification/standard_data81205-BACW10CA MANUFACTURERS STANDARD
material_document_and_classificationAMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationAMS 2414 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-022-5618
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 70188-104 · 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 2414 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: CONVEX
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.072 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN
•
SPECIFICATION/STANDARD DATA: 81205-BACW10CA MANUFACTURERS STANDARD
TECHNICAL CHARACTERISTICS
SURFACE FINISH32.0 MICROINCHES BOTTOM
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONAMS 2414 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORCONVEX
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5528 ASSN STD 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.495 INCHES MINIMUM AND 0.505 INCHES MAXIMUM IN
MATERIAL THICKNESS0.072 INCHES MINIMUM AND 0.082 INCHES MAXIMUM IN
SPECIFICATION/STANDARD DATA81205-BACW10CA MANUFACTURERS STANDARD
SPECIAL FEATURESCOLOR NATURAL
SURFACE TREATMENTLEAD OVERALL
SUBSTITUTES & CROSS-REFERENCES 5
29646-104Reference document
Same NSN cross-reference
Reference document — Secondary reference
922007-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
942007-4Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
K29646-104Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
BACW10CA104CVSame NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 70188-104?
70188-104 is a WASHER,CONVEX.
What parts can replace 70188-104?
There are 5 known substitutes for 70188-104: 29646-104, 922007-4, 942007-4 and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 70188-104?
70188-104 is cataloged in the U.S. Government catalog under NSN 5310-01-022-5618. 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.