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PartsTable / COMPONENT / 20501-38
20501-38 ✓ 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 OVERALL, nut_style: HEXAGON, nut_height: 0.178 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN, thread_class: 2B, thread_series: UNIFIED NATIONAL COARSE (UNC), thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-013-4551, 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
20501-38
NSN: 5310-00-013-4551
FSC: 5310
CAGE: 19315 — HONEYWELL INTL INC DEFENSE AVIONICS SYSTEMS FORMER BENDIX NAVIGATION AND CONTROL SYSTEMS (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.178 INCHES MINIMUM AND 0.193 INCHES MAXIMUM IN
thread_class2B
thread_seriesUNIFIED NATIONAL COARSE (UNC)
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OR ZINC OVERALL
width_across_flats0.4230 INCHES MINIMUM AND 0.4375 INCHES MAXIMUM IN
nominal_thread_size0.250 INCHES IN
bearing_surface_typeFLAT
thread_quantity_per_inch20
nondefinitive_spec/std_dataC GROUP AND 2 TYPE AND 1 STYLE AND A GRADE
NSN5310-00-013-4551
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 20501-38 · 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 SERIES: UNIFIED NATIONAL COARSE (UNC)
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
BEARING SURFACE TYPE: FLAT
•
THREAD QUANTITY PER INCH: 20
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL: STEEL OVERALL
•
SURFACE TREATMENT: CADMIUM OR ZINC OVERALL
•
NONDEFINITIVE SPEC/STD DATA: C GROUP AND 2 TYPE AND 1 STYLE AND A GRADE
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNIFIED NATIONAL COARSE (UNC)
NOMINAL THREAD SIZE0.250 INCHES IN
BEARING SURFACE TYPEFLAT
THREAD QUANTITY PER INCH20
THREAD DIRECTIONRIGHT-HAND
MATERIALSTEEL OVERALL
SURFACE TREATMENTCADMIUM OR ZINC OVERALL
NONDEFINITIVE SPEC/STD DATAC GROUP AND 2 TYPE AND 1 STYLE AND A GRADE
THREAD CLASS2B
NUT STYLEHEXAGON
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
103089Interchangeable
interchangeable cross-reference
interchangeable
340543Interchangeable
interchangeable cross-reference
interchangeable
BBKX2DInterchangeable
interchangeable cross-reference
interchangeable
110921Interchangeable
interchangeable cross-reference
interchangeable
FFN836GPCTYPE2STYLE1GRADEAInterchangeable
interchangeable cross-reference
interchangeable
110922Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 20501-38?
20501-38 is a NUT,PLAIN,HEXAGON.
What parts can replace 20501-38?
There are 21 known substitutes for 20501-38: 103089, 340543, BBKX2D and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 20501-38?
20501-38 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-00-013-4551. 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