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427261 ✓ 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

PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include diameter: 4.625 INCHES NOMINAL IN, material: ALUMINUM, head_style: FLAT, oil_groove: NOT INCLUDED, skirt_type: FULL SPLIT, carbon_groove: NOT INCLUDED. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-042-7261, 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
427261
NSN: 5315-00-042-7261
FSC: 5315
CAGE: 7X677 — GENERAL MOTORS LLC DBA GENERAL MOTORS LLC (USA)
SPECIFICATIONS
diameter4.625 INCHES NOMINAL IN
materialALUMINUM
head_styleFLAT
oil_grooveNOT INCLUDED
skirt_typeFULL SPLIT
carbon_grooveNOT INCLUDED
overall_height4.875 INCHES NOMINAL IN
surface_finishFINISHED
oil_passage_typeSLOT LOCATION NOT OTHERWISE SPECIFIED
pin_hole_bushingNOT INCLUDED
pinhole_diameter1.2499 INCHES MINIMUM AND 1.2501 INCHES MAXIMUM IN
skirt_slot_styleBASE TO GROOVE SLOT
NSN5315-00-042-7261
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 427261 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 27
A1825Interchangeable
interchangeable cross-reference
interchangeable
51122Interchangeable
interchangeable cross-reference
interchangeable
709635Interchangeable
interchangeable cross-reference
interchangeable
H-408Interchangeable
interchangeable cross-reference
interchangeable
SInterchangeable
interchangeable cross-reference
interchangeable
S-3/4Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 427261?
427261 is a PISTON,INTERNAL COMBUSTION ENGIN.
What parts can replace 427261?
There are 27 known substitutes for 427261: A1825, 51122, 709635 and 24 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 427261?
427261 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5315-00-042-7261. 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