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540C049-7 — WASHER,SHOULDERED AND RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

540C049-7: WASHER,SHOULDERED AND RECESSED.

The WASHER,SHOULDERED AND RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_depth: 0.108 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN, hole_diameter: 0.249 INCHES NOMINAL IN, recess_diameter: 0.750 INCHES NOMINAL IN, shoulder_height: 0.062 INCHES MINIMUM AND 0.142 INCHES MAXIMUM IN, outside_diameter: 1.250 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-339-0205, 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
540C049-7
NSN: 5310-00-339-0205
FSC: 5310 — Nuts and Washers
CAGE: 81755 — LOCKHEED MARTIN CORPORATION DIV LOCKHEED MARTIN AERONAUTICS COMPANY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_depth0.108 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
hole_diameter0.249 INCHES NOMINAL IN
recess_diameter0.750 INCHES NOMINAL IN
shoulder_height0.062 INCHES MINIMUM AND 0.142 INCHES MAXIMUM IN
outside_diameter1.250 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
shoulder_diameter0.375 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
material_document_and_classificationMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-339-0205
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 540C049-7 · 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: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SHOULDER HEIGHT: 0.062 INCHES MINIMUM AND 0.142 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 1.250 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
•
RECESS DEPTH: 0.108 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
•
SHOULDER DIAMETER: 0.375 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.750 INCHES NOMINAL IN
•
SURFACE TREATMENT: CADMIUM OVERALL
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER HEIGHT0.062 INCHES MINIMUM AND 0.142 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER1.250 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN
RECESS DEPTH0.108 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN
SHOULDER DIAMETER0.375 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN
RECESS DIAMETER0.750 INCHES NOMINAL IN
SURFACE TREATMENTCADMIUM OVERALL
MATERIALSTEEL OVERALL
HOLE DIAMETER0.249 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: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 540C049-7?
540C049-7 is a WASHER,SHOULDERED AND RECESSED.
What is the NSN for 540C049-7?
540C049-7 is cataloged in the U.S. Government catalog under NSN 5310-00-339-0205. 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.