ST2782-10 — NUT,SELF-LOCKING,EXTENDED WASHER

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

ST2782-10: 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, hardness_rating: 24.0 ROCKWELL C MINIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-448-0074, 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

ST2782-10

NSN: 5310-01-448-0074
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	0.308 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
hardness_rating	24.0 ROCKWELL C MINIMUM
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
washer_thickness	0.045 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
countersink_angle	85.0 DEGREES MINIMUM AND 95.0 DEGREES MAXIMUM NUT
width_across_flats	0.312 INCHES NOMINAL IN
nominal_thread_size	0.250 INCHES IN
NSN	5310-01-448-0074

COMPONENT DIAGRAM

KEY FEATURES

•

WASHER OUTSIDE DIAMETER: 0.410 INCHES MINIMUM IN

•

WIDTH ACROSS FLATS: 0.312 INCHES NOMINAL IN

•

THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)

•

HARDNESS RATING: 24.0 ROCKWELL C MINIMUM

•

CRITICALITY CODE JUSTIFICATION: FEAT

•

WASHER THICKNESS: 0.045 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS-5732 ASSN STD SINGLE MATERIAL RESPONSE OR AMS 5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.308 INCHES MINIMUM AND 0.328 INCHES MAXIMUM IN
WASHER OUTSIDE DIAMETER	0.410 INCHES MINIMUM IN
WIDTH ACROSS FLATS	0.312 INCHES NOMINAL IN
THREAD SERIES	UNIFIED NATIONAL JOINT FINE (UNJF)
HARDNESS RATING	24.0 ROCKWELL C MINIMUM
CRITICALITY CODE JUSTIFICATION	FEAT
WASHER THICKNESS	0.045 INCHES MINIMUM AND 0.060 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS-5732 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

SUBSTITUTES & CROSS-REFERENCES 7

ST2783-10Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LH13587-4Reference document

Same NSN cross-reference

Reference document — Secondary reference

ST2785-10Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

VN4761BB048Reference document

Same NSN cross-reference

Reference document — Secondary reference

ST2780-10Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

92617-428Reference document

Same NSN cross-reference

Reference document — Secondary reference

LIFECYCLE

NSN statusActive· U.S. Government catalog

No demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is ST2782-10?

ST2782-10 is a NUT,SELF-LOCKING,EXTENDED WASHER.

What parts can replace ST2782-10?

There are 7 known substitutes for ST2782-10: ST2783-10, LH13587-4, ST2785-10 and 4 more. Substitute compatibility should be verified for your specific system.

What is the NSN for ST2782-10?

ST2782-10 is cataloged in the U.S. Government catalog under NSN 5310-01-448-0074. This indicates validated use in U.S. government and defense supply chains.

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ST2782-10 — NUT,SELF-LOCKING,EXTENDED WASHER

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