3M221-8 — NUT,SELF-LOCKING,DOUBLE HEXAGON

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

3M221-8: NUT,SELF-LOCKING,DOUBLE HEXAGON.

NUT,SELF-LOCKING,DOUBLE HEXAGON. Key specifications include material: STEEL OVERALL, nut_style: DOUBLE HEXAGON, nut_height: 0.578 INCHES MAXIMUM IN, lubrication: DRY FILM LUBRICANT, temp_rating: 500.0 FAHRENHEIT NOMINAL DEGF, thread_class: 3B. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-866-5335, 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

3M221-8

NSN: 5310-00-866-5335
FSC: 5310 — Nuts and Washers
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)

SPECIFICATIONS

material	STEEL OVERALL
nut_style	DOUBLE HEXAGON
nut_height	0.578 INCHES MAXIMUM IN
lubrication	DRY FILM LUBRICANT
temp_rating	500.0 FAHRENHEIT NOMINAL DEGF
thread_class	3B
thread_series	UNF
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
countersink_angle	109.5 DEGREES MINIMUM AND 110.5 DEGREES MAXIMUM NUT
surface_treatment	CADMIUM OVERALL
width_across_flats	0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
NSN	5310-00-866-5335

COMPONENT DIAGRAM

KEY FEATURES

•

LUBRICATION: DRY FILM LUBRICANT

•

WIDTH ACROSS FLATS: 0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL

•

THREAD SERIES: UNF

•

SPECIAL TEST FEATURES: 100% MPI INSPECTION

•

TEMP RATING: 500.0 FAHRENHEIT NOMINAL DEGF

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.500 INCHES IN

TECHNICAL CHARACTERISTICS

LUBRICATION	DRY FILM LUBRICANT
WIDTH ACROSS FLATS	0.553 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TY 1,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIES	UNF
SPECIAL TEST FEATURES	100% MPI INSPECTION
TEMP RATING	500.0 FAHRENHEIT NOMINAL DEGF
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.500 INCHES IN
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT	0.578 INCHES MAXIMUM IN

SUBSTITUTES & CROSS-REFERENCES 4

FN22MG-820Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LH3393-080Reference document

Same NSN cross-reference

Reference document — Secondary reference

FN22-820Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

H23-8Same 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 3M221-8?

3M221-8 is a NUT,SELF-LOCKING,DOUBLE HEXAGON.

What parts can replace 3M221-8?

There are 4 known substitutes for 3M221-8: FN22MG-820, LH3393-080, FN22-820 and 1 more. Substitute compatibility should be verified for your specific system.

What is the NSN for 3M221-8?

3M221-8 is cataloged in the U.S. Government catalog under NSN 5310-00-866-5335. This indicates validated use in U.S. government and defense supply chains.

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3M221-8 — NUT,SELF-LOCKING,DOUBLE HEXAGON

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