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GRC561 — WASHER,RECESSED

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

GRC561: WASHER,RECESSED.

The WASHER,RECESSED is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, recess_angle: 90.0 DEGREES NOMINAL, hole_diameter: 0.316 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN, recess_diameter: 0.438 INCHES NOMINAL IN, outside_diameter: 0.562 INCHES NOMINAL IN, style_designator: RECESSED. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-534-6768, 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
GRC561
NSN: 5310-00-534-6768
FSC: 5310 — Nuts and Washers
CAGE: 25567 — THE GORMAN-RUPP COMPANY DIV GORMAN-RUPP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
recess_angle90.0 DEGREES NOMINAL
hole_diameter0.316 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
recess_diameter0.438 INCHES NOMINAL IN
outside_diameter0.562 INCHES NOMINAL IN
style_designatorRECESSED
material_thickness0.148 INCHES MINIMUM AND 0.152 INCHES MAXIMUM IN
NSN5310-00-534-6768
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: GRC561 · 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
•
STYLE DESIGNATOR: RECESSED
•
OUTSIDE DIAMETER: 0.562 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.148 INCHES MINIMUM AND 0.152 INCHES MAXIMUM IN
•
RECESS DIAMETER: 0.438 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.316 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
•
RECESS ANGLE: 90.0 DEGREES NOMINAL
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORRECESSED
OUTSIDE DIAMETER0.562 INCHES NOMINAL IN
MATERIAL THICKNESS0.148 INCHES MINIMUM AND 0.152 INCHES MAXIMUM IN
RECESS DIAMETER0.438 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.316 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN
RECESS ANGLE90.0 DEGREES NOMINAL
SUBSTITUTES & CROSS-REFERENCES 8
513667Reference document
Same NSN cross-reference
Reference document — Secondary reference
IGS99Reference document
Same NSN cross-reference
Reference document — Secondary reference
A1672Reference document
Same NSN cross-reference
Reference document — Secondary reference
5346768Reference document
Same NSN cross-reference
Reference document — Secondary reference
8UU0531Reference document
Same NSN cross-reference
Reference document — Secondary reference
47012BReference document
Same NSN cross-reference
Reference document — Design control — primary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is GRC561?
GRC561 is a WASHER,RECESSED.
What parts can replace GRC561?
There are 8 known substitutes for GRC561: 513667, IGS99, A1672 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for GRC561?
GRC561 is cataloged in the U.S. Government catalog under NSN 5310-00-534-6768. 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.