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50FPI440 ✓ 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,CLINCH is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, nut_style: CLINCH, nut_height: 0.193 INCHES MINIMUM AND 0.223 INCHES MAXIMUM IN, lubrication: SOLUBLE LUBRICANT, pilot_length: 0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN, thread_class: 3B. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-596-6440, 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
50FPI440
NSN: 5310-00-596-6440
FSC: 5310
CAGE: 13689 — SPS TECHNOLOGIES INC HALLOWELL DIV (USA)
SPECIFICATIONS
materialSTEEL CORROSION RESISTING OVERALL
nut_styleCLINCH
nut_height0.193 INCHES MINIMUM AND 0.223 INCHES MAXIMUM IN
lubricationSOLUBLE LUBRICANT
pilot_length0.058 INCHES MINIMUM AND 0.068 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNJC
pilot_diameter0.187 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
locking_featurePREVAILING TORQUE ALL METAL DESIGN
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
NSN5310-00-596-6440
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 50FPI440 · 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: 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
•
MATERIAL: STEEL CORROSION RESISTING OVERALL
•
NUT HEIGHT: 0.193 INCHES MINIMUM AND 0.223 INCHES MAXIMUM IN
•
COUNTERBORE DIAMETER: 0.139 INCHES MINIMUM AND 0.144 INCHES MAXIMUM NUT IN
•
THREAD SERIES: UNJC
•
PILOT DIAMETER: 0.187 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 3B
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
MATERIALSTEEL CORROSION RESISTING OVERALL
NUT HEIGHT0.193 INCHES MINIMUM AND 0.223 INCHES MAXIMUM IN
COUNTERBORE DIAMETER0.139 INCHES MINIMUM AND 0.144 INCHES MAXIMUM NUT IN
THREAD SERIESUNJC
PILOT DIAMETER0.187 INCHES MINIMUM AND 0.191 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3B
NOMINAL THREAD SIZE0.112 INCHES IN
NUT STYLECLINCH
VERIFIED SUBSTITUTES & CROSS-REFERENCES 15
PF14-3911-25ZGInterchangeable
interchangeable cross-reference
interchangeable
81101Interchangeable
interchangeable cross-reference
interchangeable
DA048-003BInterchangeable
interchangeable cross-reference
interchangeable
131-120Interchangeable
interchangeable cross-reference
interchangeable
08-81101Interchangeable
interchangeable cross-reference
interchangeable
004658Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 50FPI440?
50FPI440 is a NUT,SELF-LOCKING,CLINCH.
What parts can replace 50FPI440?
There are 15 known substitutes for 50FPI440: PF14-3911-25ZG, 81101, DA048-003B and 12 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 50FPI440?
50FPI440 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-596-6440. 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