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Technical Data Sheet
8331638 ✓ 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 NUT,SELF-LOCKING,CAP is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL EXCEPT INSERT, nut_style: CAP, nut_height: 1.000 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), locking_feature: PREVAILING TORQUE WITH NONMETALLIC INSERT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-569-8962, 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
8331638
NSN: 5310-00-569-8962
FSC: 5310
CAGE: 19207 — U S ARMY TANK AUTOMOTIVE COMMAND AMSTA-IM-MM (USA)
SPECIFICATIONS
materialSTEEL OVERALL EXCEPT INSERT
nut_styleCAP
nut_height1.000 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
width_across_flats1.000 INCHES NOMINAL IN
nominal_thread_size0.625 INCHES IN
bearing_surface_typeWASHER FACED
thread_quantity_per_inch11
NSN5310-00-569-8962
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 8331638 · 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
WIDTH ACROSS FLATS: 1.000 INCHES NOMINAL IN
THREAD CLASS: 2B
BEARING SURFACE TYPE: WASHER FACED
NOMINAL THREAD SIZE: 0.625 INCHES IN
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH: 11
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
MATERIAL: PLASTIC POLYAMIDE NYLON LOCKING INSERT
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS1.000 INCHES NOMINAL IN
THREAD CLASS2B
BEARING SURFACE TYPEWASHER FACED
NOMINAL THREAD SIZE0.625 INCHES IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH11
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
MATERIALPLASTIC POLYAMIDE NYLON LOCKING INSERT
NUT STYLECAP
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
15962Interchangeable
interchangeable cross-reference
interchangeable
15962-00Interchangeable
interchangeable cross-reference
interchangeable
VP250Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 8331638?
8331638 is a NUT,SELF-LOCKING,CAP.
What parts can replace 8331638?
There are 3 known substitutes for 8331638: 15962, 15962-00, VP250. Substitute compatibility should be verified for your specific system.
What is the NSN for 8331638?
8331638 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-569-8962. This indicates validated use in U.S. government and defense supply chains.
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