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Technical Data Sheet
PartsTable / COMPONENT / SPE-61-21
SPE-61-21 ✓ Verified by PartsTable
— · NUT WASHER
WHAT YOU NEED TO KNOW
Match nut grade to bolt grade for full strength Lock nuts prevent loosening under vibration
Don't mix grades — weakens the joint
PRODUCT OVERVIEW

The WASHER,FLAT is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, thickness: 0.051 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN, hole_diameter: 0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN, overall_diameter: 0.557 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN, surface_treatment: CADMIUM OVERALL, peripheral_shape_style: ROUND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-823-8804, 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
SPE-61-21
NSN: 5310-00-823-8804
FSC: 5310
CAGE: 92392 — ALLIS-CHALMERS CORP (USA)
SPECIFICATIONS
materialSTEEL OVERALL
thickness0.051 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
hole_diameter0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
overall_diameter0.557 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN
surface_treatmentCADMIUM OVERALL
peripheral_shape_styleROUND
center_hole_shape_styleROUND
end_item_identificationRG-33 AUV MRAP; MRAP BUFFALO MK2A2; ARMORED MULTI-PURPOSE VEHICLE (AMPV)
cross-sectional_shape_styleRECTANGULAR
material_document_and_classification66 FED STD SINGLE MATERIAL RESPONSE OVERALL
surface_treatment_document_and_classificationQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
NSN5310-00-823-8804
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: SPE-61-21 · 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
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
•
SURFACE TREATMENT: CADMIUM OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: 66 FED STD SINGLE MATERIAL RESPONSE OVERALL
•
OVERALL DIAMETER: 0.557 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN
•
PERIPHERAL SHAPE STYLE: ROUND
•
THICKNESS: 0.051 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
END ITEM IDENTIFICATIONRG-33 AUV MRAP; MRAP BUFFALO MK2A2; ARMORED MULTI-PURPOSE VEHICLE (AMPV)
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENTCADMIUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE OVERALL
OVERALL DIAMETER0.557 INCHES MINIMUM AND 0.577 INCHES MAXIMUM IN
PERIPHERAL SHAPE STYLEROUND
THICKNESS0.051 INCHES MINIMUM AND 0.080 INCHES MAXIMUM IN
CROSS-SECTIONAL SHAPE STYLERECTANGULAR
HOLE DIAMETER0.245 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
RJ5050-25Interchangeable
interchangeable cross-reference
interchangeable
15172Interchangeable
interchangeable cross-reference
interchangeable
17196Interchangeable
interchangeable cross-reference
interchangeable
C420168Interchangeable
interchangeable cross-reference
interchangeable
318244-86Interchangeable
interchangeable cross-reference
interchangeable
2B1-54Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is SPE-61-21?
SPE-61-21 is a WASHER,FLAT.
What parts can replace SPE-61-21?
There are 26 known substitutes for SPE-61-21: RJ5050-25, 15172, 17196 and 23 more. Substitute compatibility should be verified for your specific system.
Is SPE-61-21 still available?
SPE-61-21 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026