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561056 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

561056: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 410 OVERALL, recess_depth: 0.030 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN, hole_diameter: 0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN, overall_height: 0.050 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN, hardness_rating: 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM, outside_diameter: 0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-987-9257, 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
561056
NSN: 5310-00-987-9257
FSC: 5310 — Nuts and Washers
CAGE: 73030 — HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE (USA)
SPECIFICATIONS
materialSTEEL COMP 410 OVERALL
recess_depth0.030 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
hole_diameter0.310 INCHES MINIMUM AND 0.330 INCHES MAXIMUM IN
overall_height0.050 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
hardness_rating30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
outside_diameter0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
style_designatorRECESSED
material_thickness0.033 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-987-9257
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 561056 · 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: 30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
•
STYLE DESIGNATOR: RECESSED
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
•
RECESS DEPTH: 0.030 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
•
MATERIAL THICKNESS: 0.033 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN
•
MATERIAL: STEEL COMP 410 OVERALL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.050 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
HARDNESS RATING30.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM
STYLE DESIGNATORRECESSED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER0.640 INCHES MINIMUM AND 0.660 INCHES MAXIMUM IN
RECESS DEPTH0.030 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN
MATERIAL THICKNESS0.033 INCHES MINIMUM AND 0.048 INCHES MAXIMUM IN
MATERIALSTEEL COMP 410 OVERALL
HOLE DIAMETER0.310 INCHES MINIMUM AND 0.330 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 561056?
561056 is a WASHER,RECESSED.
What is the NSN for 561056?
561056 is cataloged in the U.S. Government catalog under NSN 5310-00-987-9257. 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.