PartsTable
Technical Data Sheet
X4-55 ✓ 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,PLAIN,HEXAGON is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY LOCATION NOT OTHERWISE SPECIFIED, nut_style: HEXAGON, head_style: OVAL SOLID (INCLUDES ROUND AND BUTTON HEADS), nut_height: 0.172 INCHES NOMINAL IN, sterilized: NO, point_style: NEEDLE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-021-9702, 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
X4-55
NSN: 5310-00-021-9702
FSC: 5310
CAGE: 15586 — CUSHMAN INC A RANSOM CO POBOX 7248 CHARLOTTE NC 28241 7248 (USA)
SPECIFICATIONS
materialCOPPER ALLOY LOCATION NOT OTHERWISE SPECIFIED
nut_styleHEXAGON
head_styleOVAL SOLID (INCLUDES ROUND AND BUTTON HEADS)
nut_height0.172 INCHES NOMINAL IN
sterilizedNO
point_styleNEEDLE
shank_styleSMOOTH ROUND
thread_class2B
thread_seriesUNF
shank_diameter0.083 INCHES MINIMUM AND 0.084 INCHES MAXIMUM IN
decorative_headNO
fastener_length0.250 INCHES NOMINAL IN
NSN5310-00-021-9702
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: X4-55 · 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
THREAD QUANTITY PER INCH: 24
NOMINAL THREAD SIZE: 0.312 INCHES IN
THREAD SERIES: UNF
BEARING SURFACE TYPE: CHAMFERED OR WASHER FACED
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NUT STYLE: HEXAGON
NONDEFINITIVE SPEC/STD DATA: A TYPE
MATERIAL: STEEL OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD QUANTITY PER INCH24
NOMINAL THREAD SIZE0.312 INCHES IN
THREAD SERIESUNF
BEARING SURFACE TYPECHAMFERED OR WASHER FACED
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-S-633-CANC FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NUT STYLEHEXAGON
NONDEFINITIVE SPEC/STD DATAA TYPE
MATERIALSTEEL OVERALL
WIDTH ACROSS FLATS0.563 INCHES NOMINAL IN
NUT HEIGHT0.172 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
102161Interchangeable
interchangeable cross-reference
interchangeable
FFS111STYLE1SInterchangeable
interchangeable cross-reference
interchangeable
71750Interchangeable
interchangeable cross-reference
interchangeable
313407Interchangeable
interchangeable cross-reference
interchangeable
60526Interchangeable
interchangeable cross-reference
interchangeable
AM-2321/SIAInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is X4-55?
X4-55 is a NUT,PLAIN,HEXAGON.
What parts can replace X4-55?
There are 19 known substitutes for X4-55: 102161, FFS111STYLE1S, 71750 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for X4-55?
X4-55 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-021-9702. This indicates validated use in U.S. government and defense supply chains.
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