PartsTable
Technical Data Sheet
2055-440 ✓ 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: STEEL COMP 303 OR STEEL COMP 303SE OVERALL, nut_style: HEXAGON, nut_height: 0.375 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-613-7170, 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
2055-440
NSN: 5310-00-613-7170
FSC: 5310
CAGE: 55566 — MATTHEW WARREN, INC DBA RAF ELECTRONIC HARDWARE DIV RAF ELECTRONIC HARDWARE, LLC (USA)
SPECIFICATIONS
materialSTEEL COMP 303 OR STEEL COMP 303SE OVERALL
nut_styleHEXAGON
nut_height0.375 INCHES NOMINAL IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.184 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN
nominal_thread_size0.112 INCHES IN
bearing_surface_typeFLAT
thread_quantity_per_inch40
specification/standard_data80205-NAS1786 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NSN5310-00-613-7170
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 2055-440 · 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: 0.184 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN
SURFACE TREATMENT: PASSIVATE OVERALL
THREAD CLASS: 2B
NUT HEIGHT: 0.375 INCHES NOMINAL IN
NUT STYLE: HEXAGON
THREAD SERIES: UNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE: 0.112 INCHES IN
BEARING SURFACE TYPE: FLAT
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.184 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN
SURFACE TREATMENTPASSIVATE OVERALL
THREAD CLASS2B
NUT HEIGHT0.375 INCHES NOMINAL IN
NUT STYLEHEXAGON
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.112 INCHES IN
BEARING SURFACE TYPEFLAT
THREAD QUANTITY PER INCH40
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 17
B18.3Interchangeable
interchangeable cross-reference
interchangeable
8220-1CInterchangeable
interchangeable cross-reference
interchangeable
S318-1004P27Interchangeable
interchangeable cross-reference
interchangeable
EG2Interchangeable
interchangeable cross-reference
interchangeable
56HSRInterchangeable
interchangeable cross-reference
interchangeable
ADDInterchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2055-440?
2055-440 is a NUT,PLAIN,HEXAGON.
What parts can replace 2055-440?
There are 17 known substitutes for 2055-440: B18.3, 8220-1C, S318-1004P27 and 14 more. Substitute compatibility should be verified for your specific system.
Is 2055-440 still available?
2055-440 is currently cancelled.
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