661641 — NUT,SELF-LOCKING,HEXAGON

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

661641: NUT,SELF-LOCKING,HEXAGON.

The NUT,SELF-LOCKING,HEXAGON is a the manufacturer industrial component. Key specifications include inscription: THIS SIDE UP, part_name_assigned_by_controlling_agency: LBL "THIS SIDE UP". This part is cataloged in the U.S.

Government catalog under NSN 5310-00-168-2978, 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

661641

NSN: 5310-00-168-2978
NIINs: 001682978, 014859444
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)

SPECIFICATIONS

inscription	THIS SIDE UP
part_name_assigned_by_controlling_agency	LBL "THIS SIDE UP"
NSN	5310-00-168-2978

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL

•

THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)

•

HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.190 INCHES IN

•

LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.365 INCHES MINIMUM AND 0.377 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	AMS 2411 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIES	UNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING	38.0 ROCKWELL C MINIMUM AND 48.0 ROCKWELL C MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5525 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.190 INCHES IN
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT	0.188 INCHES MAXIMUM IN
SURFACE TREATMENT	SILVER OVERALL

SUBSTITUTES & CROSS-REFERENCES 6

661640Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

540625Reference document

Same NSN cross-reference

Reference document — Advisory reference — outside the item-of-supply concept

H49044-3Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

5310PL0633370Reference document

Same NSN cross-reference

Reference document — Informative reference only

H31-3Reference document

Same NSN cross-reference

Reference document — Secondary reference

661642Reference document

Same NSN cross-reference

Reference document — Advisory reference — outside the item-of-supply concept

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 661641?

661641 is a NUT,SELF-LOCKING,HEXAGON.

What parts can replace 661641?

There are 6 known substitutes for 661641: 661640, 540625, H49044-3 and 3 more. Substitute compatibility should be verified for your specific system.

What is the NSN for 661641?

661641 is cataloged in the U.S. Government catalog under NSN 5310-00-168-2978. This indicates validated use in U.S. government and defense supply chains.

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661641 — NUT,SELF-LOCKING,HEXAGON

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