64740-428 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

64740-428: NUT,SELF-LOCKING,EXTENDED WASHER.

NUT,SELF-LOCKING,EXTENDED WASHER. Key specifications include material: IRON ALLOY 660 OVERALL, nut_style: DOUBLE HEXAGON, thread_class: 3B, thread_series: UNF, overall_height: 0.456 INCHES MINIMUM AND 0.471 INCHES MAXIMUM IN, locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-00-980-3891, 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

64740-428

NSN: 5310-00-980-3891
FSC: 5310 — Nuts and Washers
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)

SPECIFICATIONS

material	IRON ALLOY 660 OVERALL
nut_style	DOUBLE HEXAGON
thread_class	3B
thread_series	UNF
overall_height	0.456 INCHES MINIMUM AND 0.471 INCHES MAXIMUM IN
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
washer_thickness	0.230 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
precious_material	SILVER
surface_treatment	SILVER OVERALL
width_across_flats	0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
nominal_thread_size	0.250 INCHES IN
NSN	5310-00-980-3891

COMPONENT DIAGRAM

KEY FEATURES

•

WASHER OUTSIDE DIAMETER: 0.580 INCHES MINIMUM AND 0.600 INCHES MAXIMUM IN

•

WIDTH ACROSS FLATS: 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN

•

THREAD SERIES: UNF

•

PRECIOUS MATERIAL: SILVER

•

WASHER THICKNESS: 0.230 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

•

THREAD DIRECTION: RIGHT-HAND

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.456 INCHES MINIMUM AND 0.471 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER	0.580 INCHES MINIMUM AND 0.600 INCHES MAXIMUM IN
WIDTH ACROSS FLATS	0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN
THREAD SERIES	UNF
PRECIOUS MATERIAL	SILVER
WASHER THICKNESS	0.230 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5735 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.250 INCHES IN
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN

SUBSTITUTES & CROSS-REFERENCES 2

529263Reference document

Same NSN cross-reference

Reference document — Secondary reference

64740Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 64740-428?

64740-428 is a NUT,SELF-LOCKING,EXTENDED WASHER.

What parts can replace 64740-428?

There are 2 known substitutes for 64740-428: 529263, 64740. Substitute compatibility should be verified for your specific system.

What is the NSN for 64740-428?

64740-428 is cataloged in the U.S. Government catalog under NSN 5310-00-980-3891. This indicates validated use in U.S. government and defense supply chains.

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64740-428 — NUT,SELF-LOCKING,EXTENDED WASHER

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