81581-R — NUT,SELF-LOCKING,ROUND

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

81581-R: NUT,SELF-LOCKING,ROUND.

The NUT,SELF-LOCKING,ROUND is a the manufacturer industrial component. Key specifications include material: STEEL COMP 1018 OR STEEL COMP 4140 NUT, nut_style: ROUND, nut_diameter: 3.625 INCHES NOMINAL IN, thread_class: 3B, nut_thickness: 0.625 INCHES NOMINAL IN, thread_series: UNS. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-054-4647, 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

81581-R

NSN: 5310-01-054-4647
FSC: 5310 — Nuts and Washers
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)

SPECIFICATIONS

material	STEEL COMP 1018 OR STEEL COMP 4140 NUT
nut_style	ROUND
nut_diameter	3.625 INCHES NOMINAL IN
thread_class	3B
nut_thickness	0.625 INCHES NOMINAL IN
thread_series	UNS
locking_feature	PREVAILING TORQUE WITH NONMETALLIC INSERT
thread_direction	RIGHT-HAND
drive_point_depth	0.125 INCHES NOMINAL IN
drive_point_width	0.250 INCHES NOMINAL IN
small_end_diameter	3.125 INCHES NOMINAL IN
undercut_thickness	0.141 INCHES NOMINAL IN
NSN	5310-01-054-4647

COMPONENT DIAGRAM

KEY FEATURES

•

THREAD SERIES: UNS

•

DRIVE POINT WIDTH: 0.250 INCHES NOMINAL IN

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 2.751 INCHES IN

•

NUT DIAMETER: 3.625 INCHES NOMINAL IN

•

DRIVE POINT DEPTH: 0.125 INCHES NOMINAL IN

•

UNDERCUT THICKNESS: 0.141 INCHES NOMINAL IN

•

LOCKING FEATURE: PREVAILING TORQUE WITH NONMETALLIC INSERT

TECHNICAL CHARACTERISTICS

THREAD SERIES	UNS
DRIVE POINT WIDTH	0.250 INCHES NOMINAL IN
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	2.751 INCHES IN
NUT DIAMETER	3.625 INCHES NOMINAL IN
DRIVE POINT DEPTH	0.125 INCHES NOMINAL IN
UNDERCUT THICKNESS	0.141 INCHES NOMINAL IN
LOCKING FEATURE	PREVAILING TORQUE WITH NONMETALLIC INSERT
NUT THICKNESS	0.625 INCHES NOMINAL IN
SMALL END DIAMETER	3.125 INCHES NOMINAL IN

OTHER ITEMS IN FSC 5310 — Nuts and Washers

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5310-00-000-0040 5310-00-000-0077 5310-00-000-0079 5310-00-000-1146 5310-00-000-3815 5310-00-000-4532 5310-00-000-4540

SUBSTITUTES & CROSS-REFERENCES 2

3444-10 ITEM 48Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

BHM-14Reference document

Same NSN cross-reference

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

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 81581-R?

81581-R is a NUT,SELF-LOCKING,ROUND.

What parts can replace 81581-R?

There are 2 known substitutes for 81581-R: 3444-10 ITEM 48, BHM-14. Substitute compatibility should be verified for your specific system.

What is the NSN for 81581-R?

81581-R is cataloged in the U.S. Government catalog under NSN 5310-01-054-4647. This indicates validated use in U.S. government and defense supply chains.

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