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B420520 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

B420520: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 1.196 INCHES NOMINAL IN, outside_diameter: 1.550 INCHES NOMINAL IN, style_designator: RECESSED BOTH SIDES, top_recess_angle: 90.0 DEGREES NOMINAL, material_thickness: 0.110 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-452-6685, 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
B420520
NSN: 5310-00-452-6685
FSC: 5310 — Nuts and Washers
CAGE: K0378 — ROLLS-ROYCE PLC DIV DEFENSE (EUROPE) (GBR)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter1.196 INCHES NOMINAL IN
outside_diameter1.550 INCHES NOMINAL IN
style_designatorRECESSED BOTH SIDES
top_recess_angle90.0 DEGREES NOMINAL
material_thickness0.110 INCHES NOMINAL IN
bottom_recess_angle90.0 DEGREES NOMINAL
top_recess_diameter1.266 INCHES NOMINAL IN
bottom_recess_diameter1.266 INCHES NOMINAL IN
NSN5310-00-452-6685
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B420520 · 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
•
TOP RECESS DIAMETER: 1.266 INCHES NOMINAL IN
•
BOTTOM RECESS DIAMETER: 1.266 INCHES NOMINAL IN
•
TOP RECESS ANGLE: 90.0 DEGREES NOMINAL
•
STYLE DESIGNATOR: RECESSED BOTH SIDES
•
OUTSIDE DIAMETER: 1.550 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.110 INCHES NOMINAL IN
•
BOTTOM RECESS ANGLE: 90.0 DEGREES NOMINAL
•
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS
TOP RECESS DIAMETER1.266 INCHES NOMINAL IN
BOTTOM RECESS DIAMETER1.266 INCHES NOMINAL IN
TOP RECESS ANGLE90.0 DEGREES NOMINAL
STYLE DESIGNATORRECESSED BOTH SIDES
OUTSIDE DIAMETER1.550 INCHES NOMINAL IN
MATERIAL THICKNESS0.110 INCHES NOMINAL IN
BOTTOM RECESS ANGLE90.0 DEGREES NOMINAL
MATERIALSTEEL OVERALL
HOLE DIAMETER1.196 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 B420520?
B420520 is a WASHER,RECESSED.
What is the NSN for B420520?
B420520 is cataloged in the U.S. Government catalog under NSN 5310-00-452-6685. 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.