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Technical Data Sheet

SS-7/16SAE — WASHER,FLAT

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

SS-7/16SAE: WASHER,FLAT.

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 316L OVERALL, thickness: 0.049 INCHES NOMINAL IN, hole_diameter: 0.188 INCHES NOMINAL IN, hardness_rating: 70.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM, overall_diameter: 0.438 INCHES NOMINAL IN, surface_treatment: PASSIVATE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-661-7891, 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
SS-7/16SAE
NSN: 5310-01-661-7891
FSC: 5310 — Nuts and Washers
CAGE: 4WUG7 — SUPERIOR WASHER & GASKET CORP (USA)
SPECIFICATIONS
materialSTEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 316L OVERALL
thickness0.049 INCHES NOMINAL IN
hole_diameter0.188 INCHES NOMINAL IN
hardness_rating70.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM
overall_diameter0.438 INCHES NOMINAL IN
surface_treatmentPASSIVATE OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identification2355-01-587-2316
cross-sectional_shape_styleRECTANGULAR
specification/standard_data81343-SAE J2655 NATIONAL STD/SPEC
part_name_assigned_by_controlling_agencyWASHERS AND LOCKWASHERS
NSN5310-01-661-7891
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SS-7/16SAE · 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: ASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
OVERALL DIAMETER: 0.438 INCHES NOMINAL IN
•
HARDNESS RATING: 70.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM
•
CROSS-SECTIONAL SHAPE STYLE: RECTANGULAR
•
SPECIFICATION/STANDARD DATA: 81343-SAE J2655 NATIONAL STD/SPEC
•
SURFACE TREATMENT: PASSIVATE OVERALL
•
PERIPHERAL SHAPE STYLE: ROUND
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONASTM A380 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
OVERALL DIAMETER0.438 INCHES NOMINAL IN
HARDNESS RATING70.0 ROCKWELL B MINIMUM AND 95.0 ROCKWELL B MAXIMUM
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
SPECIFICATION/STANDARD DATA81343-SAE J2655 NATIONAL STD/SPEC
SURFACE TREATMENTPASSIVATE OVERALL
PERIPHERAL SHAPE STYLEROUND
PART NAME ASSIGNED BY CONTROLLING AGENCYWASHERS AND LOCKWASHERS
END ITEM IDENTIFICATION2355-01-587-2316
MATERIALSTEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 304L OR STEEL COMP 305 OR STEEL COMP 316 OR STEEL COMP 316L OVERALL
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 3
96659A109Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
J2655FAN0438S1Reference document
Same NSN cross-reference
Reference document — Design control — primary reference
4103623Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 SS-7/16SAE?
SS-7/16SAE is a WASHER,FLAT.
What parts can replace SS-7/16SAE?
There are 3 known substitutes for SS-7/16SAE: 96659A109, J2655FAN0438S1, 4103623. Substitute compatibility should be verified for your specific system.
What is the NSN for SS-7/16SAE?
SS-7/16SAE is cataloged in the U.S. Government catalog under NSN 5310-01-661-7891. 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.