ST3M749-5 — NUT,SELF-LOCKING,CASTELLATED,DOU

✓ Government record, cited

— · NUT WASHER

PRODUCT OVERVIEW

ST3M749-5: NUT,SELF-LOCKING,CASTELLATED,DOU.

NUT,SELF-LOCKING,CASTELLATED,DOU. Key specifications include material: STEEL COMP H11 OVERALL, nut_style: CASTELLATED, DOUBLE HEXAGON, nut_height: 0.276 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), hardness_rating: 40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM. This part is cataloged in the U.S.

Government catalog under NSN 5310-01-064-6566, 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

ST3M749-5

NSN: 5310-01-064-6566
FSC: 5310 — Nuts and Washers
CAGE: 15653 — HOWMET GLOBAL FASTENING SYSTEMS INC (USA)

SPECIFICATIONS

material	STEEL COMP H11 OVERALL
nut_style	CASTELLATED, DOUBLE HEXAGON
nut_height	0.276 INCHES NOMINAL IN
thread_class	3B
thread_series	UNIFIED NATIONAL JOINT FINE (UNJF)
hardness_rating	40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
locking_feature	PREVAILING TORQUE ALL METAL DESIGN
thread_direction	RIGHT-HAND
surface_treatment	CADMIUM OVERALL
width_across_flats	0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
nominal_thread_size	0.312 INCHES IN
bearing_surface_type	CHAMFERED
NSN	5310-01-064-6566

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-C-8837,TY II,CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL

•

THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)

•

THREAD PITCH IN MILLIMETERS: 1.058

•

HARDNESS RATING: 40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM

•

THREAD DIRECTION: RIGHT-HAND

•

NOMINAL THREAD SIZE: 0.312 INCHES IN

•

LOCKING FEATURE: PREVAILING TORQUE ALL METAL DESIGN

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	MIL-C-8837,TY II,CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIES	UNIFIED NATIONAL JOINT FINE (UNJF)
THREAD PITCH IN MILLIMETERS	1.058
HARDNESS RATING	40.0 ROCKWELL C MINIMUM AND 44.0 ROCKWELL C MAXIMUM
THREAD DIRECTION	RIGHT-HAND
NOMINAL THREAD SIZE	0.312 INCHES IN
LOCKING FEATURE	PREVAILING TORQUE ALL METAL DESIGN
NUT HEIGHT	0.276 INCHES NOMINAL IN
SURFACE TREATMENT	CADMIUM OVERALL

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

HS2370-5Reference document

Same NSN cross-reference

Reference document — Secondary reference

VN3000AB054Same 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 ST3M749-5?

ST3M749-5 is a NUT,SELF-LOCKING,CASTELLATED,DOU.

What parts can replace ST3M749-5?

There are 2 known substitutes for ST3M749-5: HS2370-5, VN3000AB054. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M749-5?

ST3M749-5 is cataloged in the U.S. Government catalog under NSN 5310-01-064-6566. This indicates validated use in U.S. government and defense supply chains.

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