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Technical Data Sheet
PartsTable / COMPONENT / 870121-00
870121-00 ✓ 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,HEXAGON is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, nut_style: HEXAGON, nut_height: 0.133 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNJC, locking_feature: PREVAILING TORQUE ALL NONMETALLIC DESIGN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-225-5229, 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
870121-00
NSN: 5310-01-225-5229
FSC: 5310
CAGE: 32345 — DEFENSE REDUCTION AGENCY (USA)
SPECIFICATIONS
materialSTEEL OVERALL
nut_styleHEXAGON
nut_height0.133 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNJC
locking_featurePREVAILING TORQUE ALL NONMETALLIC DESIGN
thread_directionRIGHT-HAND
surface_treatmentCADMIUM OVERALL
width_across_flats0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
nominal_thread_size0.1120 INCHES IN
thread_quantity_per_inch40
NSN5310-01-225-5229
COMPONENT DIAGRAM
NUT & WASHER — GRADE MATCHING REQUIRED Hex NUT CROSS-SECTION WASHER OD: — SIZE: — MATERIAL: — PN: 870121-00 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
THREAD CLASS: 3B
•
NOMINAL THREAD SIZE: 0.1120 INCHES IN
•
NUT HEIGHT: 0.133 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN
•
THREAD QUANTITY PER INCH: 40
•
LOCKING FEATURE: PREVAILING TORQUE ALL NONMETALLIC DESIGN
•
NUT STYLE: HEXAGON
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN
THREAD DIRECTIONRIGHT-HAND
THREAD CLASS3B
NOMINAL THREAD SIZE0.1120 INCHES IN
NUT HEIGHT0.133 INCHES MINIMUM AND 0.153 INCHES MAXIMUM IN
THREAD QUANTITY PER INCH40
LOCKING FEATUREPREVAILING TORQUE ALL NONMETALLIC DESIGN
NUT STYLEHEXAGON
THREAD SERIESUNJC
SURFACE TREATMENTCADMIUM OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 4
Z00.N5402337004Interchangeable
interchangeable cross-reference
interchangeable
MS20365-440Interchangeable
interchangeable cross-reference
interchangeable
69510-28Interchangeable
interchangeable cross-reference
interchangeable
22NM40Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 870121-00?
870121-00 is a NUT,SELF-LOCKING,HEXAGON.
What parts can replace 870121-00?
There are 4 known substitutes for 870121-00: Z00.N5402337004, MS20365-440, 69510-28 and 1 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 870121-00?
870121-00 is cataloged in the Federal Logistics Information System (FLIS) under NSN 5310-01-225-5229. 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