ST2781-09 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

ST2781-09: 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: 0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, locking_feature: PREVAILING TORQUE ALL METAL DESIGN. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-482-3434, 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

ST2781-09

NSN: 5310-01-482-3434
FSC: 5310 — Nuts and Washers
CAGE: 77445 — RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY (USA)

SPECIFICATIONS

material	IRON ALLOY 660 OVERALL
nut_style	DOUBLE HEXAGON
thread_class	3B
thread_series	UNIFIED NATIONAL JOINT FINE (UNJF)
overall_height	0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
washer_thickness	0.045 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
width_across_flats	0.250 INCHES NOMINAL IN
nominal_thread_size	0.190 INCHES IN
end_item_identification	EARLY WARNING, AWACS, PRATT AND WHITNEY
washer_outside_diameter	0.325 INCHES NOMINAL IN
NSN	5310-01-482-3434

COMPONENT DIAGRAM

KEY FEATURES

•

WASHER OUTSIDE DIAMETER: 0.325 INCHES NOMINAL IN

•

WIDTH ACROSS FLATS: 0.250 INCHES NOMINAL IN

•

THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)

•

WASHER THICKNESS: 0.045 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.190 INCHES IN

•

LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.230 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER	0.325 INCHES NOMINAL IN
WIDTH ACROSS FLATS	0.250 INCHES NOMINAL IN
THREAD SERIES	UNIFIED NATIONAL JOINT FINE (UNJF)
WASHER THICKNESS	0.045 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.190 INCHES IN
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN
NUT STYLE	DOUBLE HEXAGON
THREAD CLASS	3B

SUBSTITUTES & CROSS-REFERENCES 5

ST2782-09Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

ST2785-09Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

ST2780-09Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LH13587-3Reference document

Same NSN cross-reference

Reference document — Secondary reference

ST2783-09Same 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 ST2781-09?

ST2781-09 is a NUT,SELF-LOCKING,EXTENDED WASHER.

What parts can replace ST2781-09?

There are 5 known substitutes for ST2781-09: ST2782-09, ST2785-09, ST2780-09 and 2 more. Substitute compatibility should be verified for your specific system.

What is the NSN for ST2781-09?

ST2781-09 is cataloged in the U.S. Government catalog under NSN 5310-01-482-3434. This indicates validated use in U.S. government and defense supply chains.

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ST2781-09 — NUT,SELF-LOCKING,EXTENDED WASHER

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