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AS21-6 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

AS21-6: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN, hardness_rating: 24.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM, recess_diameter: 0.483 INCHES MINIMUM AND 0.495 INCHES MAXIMUM IN, outside_diameter: 0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-272-7452, 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
AS21-6
NSN: 5310-01-272-7452
FSC: 5310 — Nuts and Washers
CAGE: 10630 — ANILLO INDUSTRIES LLC (USA)
SPECIFICATIONS
materialIRON ALLOY 660 OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN
hardness_rating24.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM
recess_diameter0.483 INCHES MINIMUM AND 0.495 INCHES MAXIMUM IN
outside_diameter0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN
style_designatorRECESSED
features_providedCASEHARDENED
material_thickness0.064 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
minimum_tensile_strength130000 POUNDS PER SQUARE INCH LBS
material_document_and_classificationAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NSN5310-01-272-7452
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: AS21-6 · 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
•
HARDNESS RATING: 24.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN
•
FEATURES PROVIDED: CASEHARDENED
•
MATERIAL THICKNESS: 0.064 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.483 INCHES MINIMUM AND 0.495 INCHES MAXIMUM IN
•
MINIMUM TENSILE STRENGTH: 130000 POUNDS PER SQUARE INCH LBS
TECHNICAL CHARACTERISTICS
HARDNESS RATING24.0 ROCKWELL C MINIMUM AND 37.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONAMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5732 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN
FEATURES PROVIDEDCASEHARDENED
MATERIAL THICKNESS0.064 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
RECESS DIAMETER0.483 INCHES MINIMUM AND 0.495 INCHES MAXIMUM IN
MINIMUM TENSILE STRENGTH130000 POUNDS PER SQUARE INCH LBS
MATERIALIRON ALLOY 660 OVERALL
HOLE DIAMETER0.378 INCHES MINIMUM AND 0.388 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 1
7688-50001-004Reference document
Same NSN cross-reference
Reference document — Secondary reference
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 AS21-6?
AS21-6 is a WASHER,RECESSED.
What parts can replace AS21-6?
There is 1 known substitute for AS21-6: 7688-50001-004. Substitute compatibility should be verified for your specific system.
What is the NSN for AS21-6?
AS21-6 is cataloged in the U.S. Government catalog under NSN 5310-01-272-7452. This indicates validated use in U.S. government and defense supply chains.
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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.