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521987-71 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

521987-71: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_angle: 90.0 DEGREES NOMINAL, recess_depth: 0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN, hole_diameter: 0.670 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN, heat_treatment: AS FABRICATED, overall_height: 0.070 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-662-2020, 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
521987-71
NSN: 5310-00-662-2020
FSC: 5310 — Nuts and Washers
CAGE: 03104 — TELEDYNE BROWN ENGINEERING, INC. DBA TELEDYNE TURBINE ENGINES DIV TELEDYNE TURBINE ENGINES (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_angle90.0 DEGREES NOMINAL
recess_depth0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN
hole_diameter0.670 INCHES MINIMUM AND 0.672 INCHES MAXIMUM IN
heat_treatmentAS FABRICATED
overall_height0.070 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
recess_diameter0.720 INCHES MINIMUM AND 0.742 INCHES MAXIMUM IN
outside_diameter0.810 INCHES NOMINAL IN
style_designatorRECESSED
material_thickness0.070 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
material_document_and_classificationAMS 5062 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-662-2020
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 521987-71 · 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
•
HEAT TREATMENT: AS FABRICATED
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5062 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.810 INCHES NOMINAL IN
•
RECESS DEPTH: 0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.070 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.720 INCHES MINIMUM AND 0.742 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.070 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
HEAT TREATMENTAS FABRICATED
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5062 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.810 INCHES NOMINAL IN
RECESS DEPTH0.025 INCHES MINIMUM AND 0.035 INCHES MAXIMUM IN
MATERIAL THICKNESS0.070 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
RECESS DIAMETER0.720 INCHES MINIMUM AND 0.742 INCHES MAXIMUM IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.670 INCHES MINIMUM AND 0.672 INCHES MAXIMUM 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 521987-71?
521987-71 is a WASHER,RECESSED.
What is the NSN for 521987-71?
521987-71 is cataloged in the U.S. Government catalog under NSN 5310-00-662-2020. This indicates validated use in U.S. government and defense supply chains.
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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.