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Technical Data Sheet
PartsTable / COMPONENT / B-1878
B-1878 ✓ 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 PIN,COTTER is a the manufacturer industrial component. Key specifications include diameter: 0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN, material: STEEL OVERALL, point_type: EXTENDED PRONG SQUARE CUT, style_designator: STANDARD, underloop_length: 1.625 INCHES MINIMUM AND 1.685 INCHES MAXIMUM 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 5315-01-145-0682, 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
B-1878
NSN: 5315-01-145-0682
FSC: 5315
CAGE: 62983 — EATON AEROSPACE, LLC DBA JACKSON SOUTH (USA)
SPECIFICATIONS
diameter0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
materialSTEEL OVERALL
point_typeEXTENDED PRONG SQUARE CUT
style_designatorSTANDARD
underloop_length1.625 INCHES MINIMUM AND 1.685 INCHES MAXIMUM IN
NSN5315-01-145-0682
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: B-1878 · 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
•
UNDERLOOP LENGTH: 1.625 INCHES MINIMUM AND 1.685 INCHES MAXIMUM IN
•
STYLE DESIGNATOR: STANDARD
•
MATERIAL: STEEL OVERALL
•
POINT TYPE: EXTENDED PRONG SQUARE CUT
•
DIAMETER: 0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
TECHNICAL CHARACTERISTICS (FLIS)
UNDERLOOP LENGTH1.625 INCHES MINIMUM AND 1.685 INCHES MAXIMUM IN
STYLE DESIGNATORSTANDARD
MATERIALSTEEL OVERALL
POINT TYPEEXTENDED PRONG SQUARE CUT
DIAMETER0.116 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
GGG-T-70Interchangeable
interchangeable cross-reference
interchangeable
650-1NTInterchangeable
interchangeable cross-reference
interchangeable
GGG-T-70 TY1SEASTBInterchangeable
interchangeable cross-reference
interchangeable
1878Interchangeable
interchangeable cross-reference
interchangeable
MILW16878-3Interchangeable
interchangeable cross-reference
interchangeable
P417Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is B-1878?
B-1878 is a PIN,COTTER.
What parts can replace B-1878?
There are 12 known substitutes for B-1878: GGG-T-70, 650-1NT, GGG-T-70 TY1SEASTB and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for B-1878?
B-1878 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-01-145-0682. 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