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PartsTable / COMPONENT / 12378PC1671
12378PC1671 ✓ 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,STRAIGHT,HEADLESS is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, first_end_style: CHAMFERED, pin_overall_length: 0.750 INCHES NOMINAL IN, pin_overall_diameter: 0.2500 INCHES NOMINAL IN, first_end_taper_angle: 25.0 DEGREES NOMINAL, first_end_taper_length: 0.016 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 5315-00-221-7280, 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
12378PC1671
NSN: 5315-00-221-7280
FSC: 5315
CAGE: 61208 — TWIN DISC, INCORPORATED DBA TWIN DISC MID-ATLANTIC (USA)
SPECIFICATIONS
materialSTEEL OVERALL
first_end_styleCHAMFERED
pin_overall_length0.750 INCHES NOMINAL IN
pin_overall_diameter0.2500 INCHES NOMINAL IN
first_end_taper_angle25.0 DEGREES NOMINAL
first_end_taper_length0.016 INCHES NOMINAL IN
material_document_and_classificationN-46-S-40B,CL C6 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
second_end_relationship_with_first_endIDENTICAL
NSN5315-00-221-7280
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 12378PC1671 · 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
•
FIRST END TAPER LENGTH: 0.016 INCHES NOMINAL IN
•
FIRST END TAPER ANGLE: 25.0 DEGREES NOMINAL
•
FIRST END STYLE: CHAMFERED
•
MATERIAL DOCUMENT AND CLASSIFICATION: N-46-S-40B,CL C6 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
•
MATERIAL: STEEL OVERALL
•
PIN OVERALL LENGTH: 0.750 INCHES NOMINAL IN
•
PIN OVERALL DIAMETER: 0.2500 INCHES NOMINAL IN
•
SECOND END RELATIONSHIP WITH FIRST END: IDENTICAL
TECHNICAL CHARACTERISTICS (FLIS)
FIRST END TAPER LENGTH0.016 INCHES NOMINAL IN
FIRST END TAPER ANGLE25.0 DEGREES NOMINAL
FIRST END STYLECHAMFERED
MATERIAL DOCUMENT AND CLASSIFICATIONN-46-S-40B,CL C6 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL
MATERIALSTEEL OVERALL
PIN OVERALL LENGTH0.750 INCHES NOMINAL IN
PIN OVERALL DIAMETER0.2500 INCHES NOMINAL IN
SECOND END RELATIONSHIP WITH FIRST ENDIDENTICAL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 11
1671Interchangeable
interchangeable cross-reference
interchangeable
128SCH181-1Interchangeable
interchangeable cross-reference
interchangeable
302-4510952-42Interchangeable
interchangeable cross-reference
interchangeable
20A107Interchangeable
interchangeable cross-reference
interchangeable
167-0001-001Interchangeable
interchangeable cross-reference
interchangeable
TD0754Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 12378PC1671?
12378PC1671 is a PIN,STRAIGHT,HEADLESS.
What parts can replace 12378PC1671?
There are 11 known substitutes for 12378PC1671: 1671, 128SCH181-1, 302-4510952-42 and 8 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 12378PC1671?
12378PC1671 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-221-7280. 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