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878906 — O-RING

✓ Government record, cited
— · NUT WASHER
PRODUCT OVERVIEW

878906: O-RING.

The O-RING is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, hole_diameter: 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN, overall_height: 0.125 INCHES NOMINAL IN, hardness_rating: 40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM, outside_diameter: 0.875 INCHES NOMINAL IN, material_thickness: 0.016 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-778-9958, 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
878906
NSN: 5310-00-778-9958
NIINs: 007789958, 012748073
FSC: 5310 — Nuts and Washers
CAGE: 12603 — CLARK EQUIPMENT CO (USA)
SPECIFICATIONS
materialSTEEL OVERALL
hole_diameter0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
overall_height0.125 INCHES NOMINAL IN
hardness_rating40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
outside_diameter0.875 INCHES NOMINAL IN
material_thickness0.016 INCHES NOMINAL IN
NSN5310-00-778-9958
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 878906 · 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: 40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
•
OUTSIDE DIAMETER: 0.875 INCHES NOMINAL IN
•
MATERIAL THICKNESS: 0.016 INCHES NOMINAL IN
•
MATERIAL: STEEL OVERALL
•
HOLE DIAMETER: 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.125 INCHES NOMINAL IN
HARDNESS RATING40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
OUTSIDE DIAMETER0.875 INCHES NOMINAL IN
MATERIAL THICKNESS0.016 INCHES NOMINAL IN
MATERIALSTEEL OVERALL
HOLE DIAMETER0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN
SUBSTITUTES & CROSS-REFERENCES 3
3-46Reference document
Same NSN cross-reference
Reference document — Secondary reference
133423Reference document
Same NSN cross-reference
Reference document — Secondary reference
1P77513AReference document
Same NSN cross-reference
Reference document — Secondary reference
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 878906?
878906 is a O-RING.
What parts can replace 878906?
There are 3 known substitutes for 878906: 3-46, 133423, 1P77513A. Substitute compatibility should be verified for your specific system.
What is the NSN for 878906?
878906 is cataloged in the U.S. Government catalog under NSN 5310-00-778-9958. 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.