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56028R1 — WASHER

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

56028R1: WASHER.

The WASHER is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, hole_diameter: 1.242 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN, outside_diameter: 2.750 INCHES NOMINAL IN, style_designator: SPRING TENSION, material_thickness: 0.058 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN, material_document_and_classification: B-100 FSCM 78500 MFR REF SINGLE MATERIAL RESPONSE OVERALL. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-276-8731, 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
56028R1
NSN: 5310-00-276-8731
NIINs: 002768731, 011338325
FSC: 5310 — Nuts and Washers
CAGE: 388X5 — SOUTH FLORIDA LENDERS CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
hole_diameter1.242 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN
outside_diameter2.750 INCHES NOMINAL IN
style_designatorSPRING TENSION
material_thickness0.058 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN
material_document_and_classificationB-100 FSCM 78500 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NSN5310-00-276-8731
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 56028R1 · 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: SPRING TENSION
•
MATERIAL DOCUMENT AND CLASSIFICATION: B-100 FSCM 78500 MFR REF SINGLE MATERIAL RESPONSE OVERALL
•
OUTSIDE DIAMETER: 2.750 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.058 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN
•
MATERIAL: COPPER ALLOY OVERALL
•
HOLE DIAMETER: 1.242 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
STYLE DESIGNATORSPRING TENSION
MATERIAL DOCUMENT AND CLASSIFICATIONB-100 FSCM 78500 MFR REF SINGLE MATERIAL RESPONSE OVERALL
OUTSIDE DIAMETER2.750 INCHES NOMINAL IN
MATERIAL THICKNESS0.058 INCHES MINIMUM AND 0.062 INCHES MAXIMUM IN
MATERIALCOPPER ALLOY OVERALL
HOLE DIAMETER1.242 INCHES MINIMUM AND 1.253 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 6
2208991Reference document
Same NSN cross-reference
Reference document — Secondary reference
RHY1-24Reference document
Same NSN cross-reference
Reference document — Secondary reference
1229D992Reference document
Same NSN cross-reference
Reference document — Secondary reference
6489SRReference document
Same NSN cross-reference
Reference document — Secondary reference
11A1154Reference document
Same NSN cross-reference
Reference document — Secondary reference
4048P11Reference document
Same NSN cross-reference
Reference document — Secondary 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 56028R1?
56028R1 is a WASHER.
What parts can replace 56028R1?
There are 6 known substitutes for 56028R1: 2208991, RHY1-24, 1229D992 and 3 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 56028R1?
56028R1 is cataloged in the U.S. Government catalog under NSN 5310-00-276-8731. 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.