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28X870 ✓ 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,LOCK is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.5937 INCHES NOMINAL IN, outside_diameter: 0.9057 INCHES NOMINAL IN, style_designator: SPLIT HELICAL-RIGHT HAND, surface_treatment: NICKEL OVERALL, material_thickness: 0.156 INCHES NOMINAL IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-264-1993, 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
28X870
NSN: 5310-00-264-1993
FSC: 5310
CAGE: 02413 — KERSEY / AMERICAN LAFRANCE A DIV OF FIGGIE INTERNATIONAL INC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.5937 INCHES NOMINAL IN
outside_diameter0.9057 INCHES NOMINAL IN
style_designatorSPLIT HELICAL-RIGHT HAND
surface_treatmentNICKEL OVERALL
material_thickness0.156 INCHES NOMINAL IN
NSN5310-00-264-1993
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 28X870 · 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: NICKEL OVERALL
•
OUTSIDE DIAMETER: 0.9057 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.156 INCHES NOMINAL IN
•
HOLE DIAMETER: 0.5937 INCHES NOMINAL IN
•
STYLE DESIGNATOR: SPLIT HELICAL-RIGHT HAND
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
SURFACE TREATMENTNICKEL OVERALL
OUTSIDE DIAMETER0.9057 INCHES NOMINAL IN
MATERIAL THICKNESS0.156 INCHES NOMINAL IN
HOLE DIAMETER0.5937 INCHES NOMINAL IN
STYLE DESIGNATORSPLIT HELICAL-RIGHT HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 18
22004Interchangeable
interchangeable cross-reference
interchangeable
1930-0010Interchangeable
interchangeable cross-reference
interchangeable
B10225Interchangeable
interchangeable cross-reference
interchangeable
FS88501-1V1Interchangeable
interchangeable cross-reference
interchangeable
X1498Interchangeable
interchangeable cross-reference
interchangeable
1103 3-4X1-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 28X870?
28X870 is a WASHER,LOCK.
What parts can replace 28X870?
There are 18 known substitutes for 28X870: 22004, 1930-0010, B10225 and 15 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 28X870?
28X870 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-264-1993. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026