LB57-4-27 — BOLT,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

LB57-4-27: BOLT,CLOSE TOLERANCE.

The BOLT,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OR COBALT ALLOY SPRING, head_style: DISHED HEXAGON, grip_length: 1.688 INCHES MINIMUM AND 1.704 INCHES MAXIMUM IN, head_height: 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5306-01-460-9500, 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

LB57-4-27

NSN: 5306-01-460-9500
FSC: 5306 — Bolts
CAGE: 73197 — HI-SHEAR CORPORATION (USA)

SPECIFICATIONS

material	STEEL CORROSION RESISTING OR COBALT ALLOY SPRING
head_style	DISHED HEXAGON
grip_length	1.688 INCHES MINIMUM AND 1.704 INCHES MAXIMUM IN
head_height	0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
thread_class	3A A
grip_diameter	0.2487 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN
thread_length	0.375 INCHES NOMINAL IN
surface_finish	32.0 MICROINCHES GRIP
fastener_length	2.188 INCHES MINIMUM AND 2.204 INCHES MAXIMUM IN
special_features	PLUNGER PROTRUDING FROM HEAD 0.075 IN. MAX IN
thread_direction	RIGHT-HAND
surface_treatment	PASSIVATE OVERALL
NSN	5306-01-460-9500

COMPONENT DIAGRAM

KEY FEATURES

•

SURFACE FINISH: 32.0 MICROINCHES GRIP

•

HEAD HEIGHT: 0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN

•

FASTENER LENGTH: 2.188 INCHES MINIMUM AND 2.204 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL

•

THREAD LENGTH: 0.375 INCHES NOMINAL IN

•

SHANK UNTHREADED HOLE DIAMETER: 0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM THREADS IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE FASTENER

TECHNICAL CHARACTERISTICS

SURFACE FINISH	32.0 MICROINCHES GRIP
HEAD HEIGHT	0.126 INCHES MINIMUM AND 0.141 INCHES MAXIMUM IN
FASTENER LENGTH	2.188 INCHES MINIMUM AND 2.204 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.375 INCHES NOMINAL IN
SHANK UNTHREADED HOLE DIAMETER	0.076 INCHES MINIMUM AND 0.086 INCHES MAXIMUM THREADS IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE FASTENER
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE LOCKING FEATURE
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	DISHED HEXAGON

OTHER ITEMS IN FSC 5306 — Bolts

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

5306-00-001-1276 5306-00-001-1949 5306-00-001-1988 5306-00-001-1989 5306-00-001-1990 5306-00-001-1991 5306-00-001-1993 5306-00-001-2017

SUBSTITUTES & CROSS-REFERENCES 2

SLB131-4-27Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

AS374-4-27Same 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 LB57-4-27?

LB57-4-27 is a BOLT,CLOSE TOLERANCE.

What parts can replace LB57-4-27?

There are 2 known substitutes for LB57-4-27: SLB131-4-27, AS374-4-27. Substitute compatibility should be verified for your specific system.

What is the NSN for LB57-4-27?

LB57-4-27 is cataloged in the U.S. Government catalog under NSN 5306-01-460-9500. This indicates validated use in U.S. government and defense supply chains.

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