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PartsTable / COMPONENT / P52
P52 ✓ 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 FILTER ELEMENT,FLUID is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY, nut_style: HEXAGON, nut_height: 0.421 INCHES NOMINAL IN, point_size: 0.375 INCHES IN, design_type: NONREUSABLE, shank_shape: ROUND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-022-0068, 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
P52
NSN: 5310-00-022-0068
FSC: 5310
CAGE: 22888 — FMC CORP (USA)
SPECIFICATIONS
materialCOPPER ALLOY
nut_styleHEXAGON
nut_height0.421 INCHES NOMINAL IN
point_size0.375 INCHES IN
design_typeNONREUSABLE
shank_shapeROUND
thread_class2B FIRST END
body_diameter4.250 INCHES NOMINAL IN
overall_depth26.000 INCHES NOMINAL IN
overall_width33.000 INCHES NOMINAL IN
thread_length0.875 INCHES NOMINAL FIRST END IN
thread_seriesUNIFIED NATIONAL COARSE (UNC)
NSN5310-00-022-0068
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: P52 · 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: 0.812 INCHES NOMINAL IN
•
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
•
THREAD QUANTITY PER INCH: 13
•
BEARING SURFACE TYPE: WASHER FACED
•
NOMINAL THREAD SIZE: 0.500 INCHES IN
•
MATERIAL: STEEL OVERALL
•
SPECIFICATION/STANDARD DATA: 81348-FF-B-571/SUPERSEDED/ GOVERNMENT SPECIFICATION
•
THREAD CLASS: 2B
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.812 INCHES NOMINAL IN
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
THREAD QUANTITY PER INCH13
BEARING SURFACE TYPEWASHER FACED
NOMINAL THREAD SIZE0.500 INCHES IN
MATERIALSTEEL OVERALL
SPECIFICATION/STANDARD DATA81348-FF-B-571/SUPERSEDED/ GOVERNMENT SPECIFICATION
THREAD CLASS2B
DEPARTURE FROM CITED DOCUMENTAS MODIFIED BY NUT HEIGHT
NONDEFINITIVE SPEC/STD DATAB2 TYPE AND A1 STYLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
A77-180Interchangeable
interchangeable cross-reference
interchangeable
P254Interchangeable
interchangeable cross-reference
interchangeable
8-172Interchangeable
interchangeable cross-reference
interchangeable
P52Interchangeable
interchangeable cross-reference
interchangeable
95000-100Interchangeable
interchangeable cross-reference
interchangeable
9018998Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is P52?
P52 is a FILTER ELEMENT,FLUID.
What parts can replace P52?
There are 14 known substitutes for P52: A77-180, P254, 8-172 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for P52?
P52 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-022-0068. 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