ST3M557-4-18 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M557-4-18: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, head_style: FILLISTER COUNTERSUNK, grip_length: 1.125 INCHES NOMINAL IN, head_height: 0.015 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.249 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-526-6960, 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

ST3M557-4-18

NSN: 5305-01-526-6960
FSC: 5305 — Screws
CAGE: 58998 — FASTENER INNOVATION TECHNOLOGY, INC. DBA F I T (USA)

SPECIFICATIONS

material	NICKEL ALLOY 718 OVERALL
head_style	FILLISTER COUNTERSUNK
grip_length	1.125 INCHES NOMINAL IN
head_height	0.015 INCHES NOMINAL IN
thread_class	3A A
grip_diameter	0.249 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
head_diameter	0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
thread_length	0.469 INCHES NOMINAL IN
fastener_length	1.594 INCHES NOMINAL IN
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatment	PASSIVATE OVERALL
NSN	5305-01-526-6960

COMPONENT DIAGRAM

KEY FEATURES

•

HEAD HEIGHT: 0.015 INCHES NOMINAL IN

•

FASTENER LENGTH: 1.594 INCHES NOMINAL IN

•

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

•

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: FILLISTER COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

TECHNICAL CHARACTERISTICS

HEAD HEIGHT	0.015 INCHES NOMINAL IN
FASTENER LENGTH	1.594 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
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	FILLISTER COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
GRIP LENGTH	1.125 INCHES NOMINAL IN
GRIP DIAMETER	0.249 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN

OTHER ITEMS IN FSC 5305 — Screws

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

5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753

SUBSTITUTES & CROSS-REFERENCES 2

WC4027-4-18Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

HT4027-4-18Same 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 ST3M557-4-18?

ST3M557-4-18 is a SCREW,CLOSE TOLERANCE.

What parts can replace ST3M557-4-18?

There are 2 known substitutes for ST3M557-4-18: WC4027-4-18, HT4027-4-18. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M557-4-18?

ST3M557-4-18 is cataloged in the U.S. Government catalog under NSN 5305-01-526-6960. This indicates validated use in U.S. government and defense supply chains.

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