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K52207P7 — WASHER,CONCAVE

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

K52207P7: WASHER,CONCAVE.

The WASHER,CONCAVE is a the manufacturer industrial component. Key specifications include radius: 0.496 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN, material: STEEL COMP 8740 OR STEEL COMP E4340 OVERALL, recess_depth: 0.075 INCHES NOMINAL IN, hole_diameter: 0.592 INCHES MINIMUM AND 0.598 INCHES MAXIMUM IN, hardness_rating: 38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM, outside_diameter: 0.863 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-321-8612, 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
K52207P7
NSN: 5310-01-321-8612
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)
SPECIFICATIONS
radius0.496 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
materialSTEEL COMP 8740 OR STEEL COMP E4340 OVERALL
recess_depth0.075 INCHES NOMINAL IN
hole_diameter0.592 INCHES MINIMUM AND 0.598 INCHES MAXIMUM IN
hardness_rating38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
outside_diameter0.863 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN
style_designatorCONCAVE
surface_treatmentCADMIUM AND CHROMATE OVERALL
material_thickness0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
material_document_and_classificationMIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-01-321-8612
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: K52207P7 · 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
•
RADIUS: 0.496 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
•
HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: CONCAVE
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.863 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN
•
RECESS DEPTH: 0.075 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
RADIUS0.496 INCHES MINIMUM AND 0.501 INCHES MAXIMUM IN
HARDNESS RATING38.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORCONCAVE
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-S-6049 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.863 INCHES MINIMUM AND 0.873 INCHES MAXIMUM IN
RECESS DEPTH0.075 INCHES NOMINAL IN
MATERIAL THICKNESS0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN
SURFACE TREATMENTCADMIUM AND CHROMATE OVERALL
MATERIALSTEEL COMP 8740 OR STEEL COMP E4340 OVERALL
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: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is K52207P7?
K52207P7 is a WASHER,CONCAVE.
What is the NSN for K52207P7?
K52207P7 is cataloged in the U.S. Government catalog under NSN 5310-01-321-8612. 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.