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277B-1-8-F-4 — WASHER,SHOULDERED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

277B-1-8-F-4: WASHER,SHOULDERED.

The WASHER,SHOULDERED is a the manufacturer industrial component. Key specifications include material: PLASTIC POLYAMIDE NYLON OVERALL, hole_diameter: 2.905 INCHES NOMINAL IN, shoulder_height: 0.750 INCHES NOMINAL IN, outside_diameter: 3.905 INCHES NOMINAL IN, style_designator: SHOULDERED, shoulder_diameter: 3.155 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-392-8412, 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
277B-1-8-F-4
NSN: 5310-01-392-8412
FSC: 5310 — Nuts and Washers
CAGE: 55242 — ISOMETRICS INC (USA)
SPECIFICATIONS
materialPLASTIC POLYAMIDE NYLON OVERALL
hole_diameter2.905 INCHES NOMINAL IN
shoulder_height0.750 INCHES NOMINAL IN
outside_diameter3.905 INCHES NOMINAL IN
style_designatorSHOULDERED
shoulder_diameter3.155 INCHES NOMINAL IN
material_thickness0.125 INCHES NOMINAL IN
NSN5310-01-392-8412
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 277B-1-8-F-4 · 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
•
SHOULDER HEIGHT: 0.750 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SHOULDERED
•
OUTSIDE DIAMETER: 3.905 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.125 INCHES NOMINAL IN
•
SHOULDER DIAMETER: 3.155 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYAMIDE NYLON OVERALL
•
HOLE DIAMETER: 2.905 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SHOULDER HEIGHT0.750 INCHES NOMINAL IN
STYLE DESIGNATORSHOULDERED
OUTSIDE DIAMETER3.905 INCHES NOMINAL IN
MATERIAL THICKNESS0.125 INCHES NOMINAL IN
SHOULDER DIAMETER3.155 INCHES NOMINAL IN
MATERIALPLASTIC POLYAMIDE NYLON OVERALL
HOLE DIAMETER2.905 INCHES NOMINAL IN
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

No substitute or cross-reference records for this part.

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 277B-1-8-F-4?
277B-1-8-F-4 is a WASHER,SHOULDERED.
What is the NSN for 277B-1-8-F-4?
277B-1-8-F-4 is cataloged in the U.S. Government catalog under NSN 5310-01-392-8412. 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.