ALL11973-4 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

ALL11973-4: 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: UNIFIED NATIONAL JOINT FINE (UNJF), overall_height: 0.308 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN, locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-388-8013, 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

ALL11973-4

NSN: 5310-01-388-8013
FSC: 5310 — Nuts and Washers
CAGE: 019L2 — ESNA, LLC (USA)

SPECIFICATIONS

material	IRON ALLOY 660 OVERALL
nut_style	DOUBLE HEXAGON
thread_class	3B
thread_series	UNIFIED NATIONAL JOINT FINE (UNJF)
overall_height	0.308 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
precious_material	SILVER
surface_treatment	SILVER OVERALL
width_across_flats	0.312 INCHES NOMINAL IN
nominal_thread_size	0.250 INCHES IN
washer_outside_diameter	0.450 INCHES NOMINAL IN
NSN	5310-01-388-8013

COMPONENT DIAGRAM

KEY FEATURES

•

WASHER OUTSIDE DIAMETER: 0.450 INCHES NOMINAL IN

•

WIDTH ACROSS FLATS: 0.312 INCHES NOMINAL IN

•

THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)

•

PRECIOUS MATERIAL: SILVER

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.250 INCHES IN

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.308 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER	0.450 INCHES NOMINAL IN
WIDTH ACROSS FLATS	0.312 INCHES NOMINAL IN
THREAD SERIES	UNIFIED NATIONAL JOINT FINE (UNJF)
PRECIOUS MATERIAL	SILVER
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.250 INCHES IN
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN
SURFACE TREATMENT	SILVER OVERALL

SUBSTITUTES & CROSS-REFERENCES 2

ST1488-10Reference document

Same NSN cross-reference

Reference document — Secondary reference

ST1484-10Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusActive· U.S. Government catalog

No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is ALL11973-4?

ALL11973-4 is a NUT,SELF-LOCKING,EXTENDED WASHER.

What parts can replace ALL11973-4?

There are 2 known substitutes for ALL11973-4: ST1488-10, ST1484-10. Substitute compatibility should be verified for your specific system.

What is the NSN for ALL11973-4?

ALL11973-4 is cataloged in the U.S. Government catalog under NSN 5310-01-388-8013. This indicates validated use in U.S. government and defense supply chains.

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ALL11973-4 — NUT,SELF-LOCKING,EXTENDED WASHER

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