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Technical Data Sheet
PartsTable / COMPONENT / 203857
203857 ✓ 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 PULLEY,GROOVE is a the manufacturer industrial component. Key specifications include special_features: SHEAVE ASSEMBLY CONSISTS OF: 11 IN. MACHINED SHEAVE, 034546; INNER RACE BEARING, 203858 IN, end_item_identification: STRADDLE LIFT.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-163-8256, 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
203857
NSN: 5310-01-163-8256
FSC: 5310
CAGE: 24234 — AUSTIN-WESTRAN LLC (USA)
SPECIFICATIONS
special_featuresSHEAVE ASSEMBLY CONSISTS OF: 11 IN. MACHINED SHEAVE, 034546; INNER RACE BEARING, 203858 IN
end_item_identificationSTRADDLE LIFT
NSN5310-01-163-8256
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 203857 · 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
•
SURFACE TREATMENT: ZINC NUT
•
LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT
•
NOMINAL THREAD SIZE: 0.138 INCHES IN
•
THREAD QUANTITY PER INCH: 32
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
BEARING SURFACE TYPE: CHAMFERED
•
MATERIAL: PLASTIC LOCKING INSERT
•
NUT HEIGHT: 0.178 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
SURFACE TREATMENTZINC NUT
LOCKING FEATUREPREVAILING TORQUE WITH NONMETALLIC INSERT
NOMINAL THREAD SIZE0.138 INCHES IN
THREAD QUANTITY PER INCH32
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
BEARING SURFACE TYPECHAMFERED
MATERIALPLASTIC LOCKING INSERT
NUT HEIGHT0.178 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL NUT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
P722626-501Interchangeable
interchangeable cross-reference
interchangeable
M439520SUB1PT1Interchangeable
interchangeable cross-reference
interchangeable
P12964Interchangeable
interchangeable cross-reference
interchangeable
62222Interchangeable
interchangeable cross-reference
interchangeable
50065AInterchangeable
interchangeable cross-reference
interchangeable
50065Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 203857?
203857 is a PULLEY,GROOVE.
What parts can replace 203857?
There are 15 known substitutes for 203857: P722626-501, M439520SUB1PT1, P12964 and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 203857?
203857 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-163-8256. 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