PartsTable
Technical Data Sheet
386B203 ✓ 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,HEXAGON is a the manufacturer industrial component. Key specifications include material: PLASTIC LOCKING INSERT, nut_style: HEXAGON, nut_height: 0.750 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 5310-01-491-6660, 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
386B203
NSN: 5310-01-491-6660
FSC: 5310
CAGE: 90099 — NORTHROP GRUMMAN SYSTEMS CORPORATION DIV MARINE SYSTEMS (USA)
SPECIFICATIONS
materialPLASTIC LOCKING INSERT
nut_styleHEXAGON
nut_height0.750 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
locking_featurePREVAILING TORQUE WITH NONMETALLIC INSERT
thread_directionRIGHT-HAND
width_across_flats0.928 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN
nominal_thread_size0.625 INCHES IN
bearing_surface_typeCHAMFERED
thread_quantity_per_inch11
NSN5310-01-491-6660
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 386B203 · 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
NUT STYLE: HEXAGON
MATERIAL: PLASTIC LOCKING INSERT
NOMINAL THREAD SIZE: 0.625 INCHES IN
THREAD QUANTITY PER INCH: 11
BEARING SURFACE TYPE: CHAMFERED
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
TECHNICAL CHARACTERISTICS (FLIS)
NUT STYLEHEXAGON
MATERIALPLASTIC LOCKING INSERT
NOMINAL THREAD SIZE0.625 INCHES IN
THREAD QUANTITY PER INCH11
BEARING SURFACE TYPECHAMFERED
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
MATERIALSTEEL NUT
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS2B
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
29NE101Interchangeable
interchangeable cross-reference
interchangeable
0N10WInterchangeable
interchangeable cross-reference
interchangeable
1741AS554-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 386B203?
386B203 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 386B203?
There are 3 known substitutes for 386B203: 29NE101, 0N10W, 1741AS554-1. Substitute compatibility should be verified for your specific system.
What is the NSN for 386B203?
386B203 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-491-6660. This indicates validated use in U.S. government and defense supply chains.
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