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491405 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

491405: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_angle: 45.0 DEGREES NOMINAL, hole_diameter: 0.627 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN, recess_diameter: 0.765 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN, outside_diameter: 1.048 INCHES MINIMUM AND 1.078 INCHES MAXIMUM IN, style_designator: RECESSED. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-101-4751, 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
491405
NSN: 5310-01-101-4751
FSC: 5310 — Nuts and Washers
CAGE: 03950 — NAVAL INVENTORY CONTROL POINT MECHANICSBURG (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_angle45.0 DEGREES NOMINAL
hole_diameter0.627 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN
recess_diameter0.765 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN
outside_diameter1.048 INCHES MINIMUM AND 1.078 INCHES MAXIMUM IN
style_designatorRECESSED
material_thickness0.063 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN
part_name_assigned_by_controlling_agencyNAVY SPECIAL PROJECT
NSN5310-01-101-4751
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 491405 · 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
•
STYLE DESIGNATOR: RECESSED
•
OUTSIDE DIAMETER: 1.048 INCHES MINIMUM AND 1.078 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.063 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.765 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.627 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN
•
RECESS ANGLE: 45.0 DEGREES NOMINAL
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORRECESSED
OUTSIDE DIAMETER1.048 INCHES MINIMUM AND 1.078 INCHES MAXIMUM IN
MATERIAL THICKNESS0.063 INCHES MINIMUM AND 0.093 INCHES MAXIMUM IN
RECESS DIAMETER0.765 INCHES MINIMUM AND 0.785 INCHES MAXIMUM IN
PART NAME ASSIGNED BY CONTROLLING AGENCYNAVY SPECIAL PROJECT
MATERIALSTEEL OVERALL
HOLE DIAMETER0.627 INCHES MINIMUM AND 0.647 INCHES MAXIMUM IN
RECESS ANGLE45.0 DEGREES NOMINAL
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 491405?
491405 is a WASHER,RECESSED.
What is the NSN for 491405?
491405 is cataloged in the U.S. Government catalog under NSN 5310-01-101-4751. 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.