ST3M557-4-7 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M557-4-7: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.437 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.249 INCHES NOMINAL IN, head_diameter: 0.389 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-587-3954, 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

ST3M557-4-7

NSN: 5305-01-587-3954
FSC: 5305 — Screws
CAGE: 0ZC92 — HEARTLAND PRECISION FASTENERS INC (USA)

SPECIFICATIONS

material	NICKEL ALLOY 718 OVERALL
head_style	FLAT COUNTERSUNK
grip_length	0.437 INCHES NOMINAL IN
thread_class	3A A
grip_diameter	0.249 INCHES NOMINAL IN
head_diameter	0.389 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
thread_length	0.469 INCHES NOMINAL IN
fastener_length	0.906 INCHES NOMINAL IN
thread_direction	RIGHT-HAND
countersink_angle	100.0 DEGREES NOMINAL
internal_drive_style	TORQUE
end_item_identification	C-5 AIRCRAFT
NSN	5305-01-587-3954

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 0.906 INCHES NOMINAL IN

•

THREAD LENGTH: 0.469 INCHES NOMINAL IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

•

GRIP LENGTH: 0.437 INCHES NOMINAL IN

•

GRIP DIAMETER: 0.249 INCHES NOMINAL IN

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	0.906 INCHES NOMINAL IN
THREAD LENGTH	0.469 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
GRIP LENGTH	0.437 INCHES NOMINAL IN
GRIP DIAMETER	0.249 INCHES NOMINAL IN
INTERNAL DRIVE STYLE	TORQUE
COUNTERSINK ANGLE	100.0 DEGREES NOMINAL

SUBSTITUTES & CROSS-REFERENCES 3

WC4027-4-7Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

HT4027-4-7Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

11923-4-7Same 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 ST3M557-4-7?

ST3M557-4-7 is a SCREW,CLOSE TOLERANCE.

What parts can replace ST3M557-4-7?

There are 3 known substitutes for ST3M557-4-7: WC4027-4-7, HT4027-4-7, 11923-4-7. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M557-4-7?

ST3M557-4-7 is cataloged in the U.S. Government catalog under NSN 5305-01-587-3954. This indicates validated use in U.S. government and defense supply chains.

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