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PartsTable / COMPONENT / 25166764
25166764 ✓ 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

NUT,SELF-LOCKING,CASTELLATED,HEX. Key specifications include nut_style: CASTELLATED, HEXAGON, nut_height: 0.344 INCHES NOMINAL IN, thread_series: UNIFIED NATIONAL COARSE (UNC), locking_feature: PREVAILING TORQUE ALL METAL DESIGN, thread_direction: RIGHT-HAND, width_across_flats: 0.500 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 5310-01-553-5943, 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
25166764
NSN: 5310-01-553-5943
FSC: 5310
CAGE: Z4117 — VOLVO GROUP GOVERNMENT SALES OCEANI OCEANIA VOLVO GROUP GOVERNMENT SALES (AUS)
SPECIFICATIONS
nut_styleCASTELLATED, HEXAGON
nut_height0.344 INCHES NOMINAL IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
width_across_flats0.500 INCHES NOMINAL IN
nominal_thread_size0.312 INCHES IN
bearing_surface_typeFLAT
hole_configuration_styleCONFIGURATION A
part_name_assigned_by_controlling_agencyHEX LOCK NUTS
NSN5310-01-553-5943
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 25166764 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
WIDTH ACROSS FLATS: 0.500 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NUT HEIGHT: 0.344 INCHES NOMINAL IN
•
HOLE CONFIGURATION STYLE: CONFIGURATION A
•
NUT STYLE: CASTELLATED, HEXAGON
•
LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
WIDTH ACROSS FLATS0.500 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
PART NAME ASSIGNED BY CONTROLLING AGENCYHEX LOCK NUTS
NUT HEIGHT0.344 INCHES NOMINAL IN
HOLE CONFIGURATION STYLECONFIGURATION A
NUT STYLECASTELLATED, HEXAGON
LOCKING FEATUREPREVAILING TORQUE ALL METAL DESIGN
NOMINAL THREAD SIZE0.312 INCHES IN
BEARING SURFACE TYPEFLAT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
2N4261Interchangeable
interchangeable cross-reference
interchangeable
207056P1Interchangeable
interchangeable cross-reference
interchangeable
10000960Interchangeable
Same NIIN cross-reference
interchangeable
23AX332Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 25166764?
25166764 is a NUT,SELF-LOCKING,CASTELLATED,HEX.
What parts can replace 25166764?
There are 4 known substitutes for 25166764: 2N4261, 207056P1, 10000960 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 25166764?
25166764 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-553-5943. 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