121FK4280 — NUT,SELF-LOCKING,HEXAGON

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

121FK4280: NUT,SELF-LOCKING,HEXAGON.

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include nut_style: HEXAGON, nut_height: 0.240 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN, lubrication: SOLUBLE LUBRICANT, temp_rating: 250.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B, thread_series: UNF. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-877-5796, 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

121FK4280

NSN: 5310-00-877-5796
FSC: 5310 — Nuts and Washers
CAGE: D9182 — ZF INDUSTRIEANTRIEBE WITTEN GMBH (DEU)

SPECIFICATIONS

nut_style	HEXAGON
nut_height	0.240 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN
lubrication	SOLUBLE LUBRICANT
temp_rating	250.0 FAHRENHEIT NOMINAL DEGF
thread_class	3B
thread_series	UNF
locking_feature	PREVAILING TORQUE WITH NONMETALLIC INSERT
thread_direction	RIGHT-HAND
countersink_angle	88.0 DEGREES NOMINAL NUT
surface_treatment	CADMIUM AND CHROMATE NUT
width_across_flats	0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
nominal_thread_size	0.250 INCHES IN
NSN	5310-00-877-5796

COMPONENT DIAGRAM

KEY FEATURES

•

LUBRICATION: SOLUBLE LUBRICANT

•

WIDTH ACROSS FLATS: 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN

•

BEARING SURFACE FINISH: 125.0 MICROINCHES

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE NUT

•

THREAD SERIES: UNF

•

TEMP RATING: 250.0 FAHRENHEIT NOMINAL DEGF

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.250 INCHES IN

TECHNICAL CHARACTERISTICS

LUBRICATION	SOLUBLE LUBRICANT
WIDTH ACROSS FLATS	0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN
BEARING SURFACE FINISH	125.0 MICROINCHES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE NUT
THREAD SERIES	UNF
TEMP RATING	250.0 FAHRENHEIT NOMINAL DEGF
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.250 INCHES IN
COUNTERBORE DIAMETER	0.253 INCHES MINIMUM AND 0.293 INCHES MAXIMUM NUT IN
LOCKING FEATURE	PREVAILING TORQUE WITH NONMETALLIC INSERT

SUBSTITUTES & CROSS-REFERENCES 7

MS21044N4Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

F52NE048Reference document

Same NSN cross-reference

Reference document — Secondary reference

2332351-N14Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

210298N4Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

52N1610-048Reference document

Same NSN cross-reference

Reference document — Replaced / superseded reference

NASM21044-N4Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusCancelled· U.S. Government catalog

Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 121FK4280?

121FK4280 is a NUT,SELF-LOCKING,HEXAGON.

What parts can replace 121FK4280?

There are 7 known substitutes for 121FK4280: MS21044N4, F52NE048, 2332351-N14 and 4 more. Substitute compatibility should be verified for your specific system.

What is the NSN for 121FK4280?

121FK4280 is cataloged in the U.S. Government catalog under NSN 5310-00-877-5796. This indicates validated use in U.S. government and defense supply chains.

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