ST3M557-4-21 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M557-4-21: 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: 1.313 INCHES NOMINAL IN, head_height: 0.015 INCHES MAXIMUM IN, point_style: FLAT, point_length: 0.045 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-591-0047, 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

ST3M557-4-21

NSN: 5305-01-591-0047
FSC: 5305 — Screws
CAGE: 0ZC92 — HEARTLAND PRECISION FASTENERS INC (USA)

SPECIFICATIONS

material	NICKEL ALLOY 718 OVERALL
head_style	FILLISTER COUNTERSUNK
grip_length	1.313 INCHES NOMINAL IN
head_height	0.015 INCHES MAXIMUM IN
point_style	FLAT
point_length	0.045 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	1.767 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN
special_features	HEAD HAS A 1.40 DEGREE RADIUS DOME
NSN	5305-01-591-0047

COMPONENT DIAGRAM

KEY FEATURES

•

HEAD HEIGHT: 0.015 INCHES MAXIMUM IN

•

POINT LENGTH: 0.045 INCHES NOMINAL IN

•

FASTENER LENGTH: 1.767 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: AMS 2700, METHOD 1 ASSN STD SINGLE TREATMENT RESPONSE OVERALL

•

THREAD LENGTH: 0.469 INCHES NOMINAL IN

•

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

•

POINT CHAMFER ANGLE: 45.0 DEGREES NOMINAL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

TECHNICAL CHARACTERISTICS

HEAD HEIGHT	0.015 INCHES MAXIMUM IN
POINT LENGTH	0.045 INCHES NOMINAL IN
FASTENER LENGTH	1.767 INCHES MINIMUM AND 1.797 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	AMS 2700, METHOD 1 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.469 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
POINT CHAMFER ANGLE	45.0 DEGREES NOMINAL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	FILLISTER COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND

OTHER ITEMS IN FSC 5305 — Screws

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

5305-00-000-0094 5305-00-000-1397 5305-00-000-2625 5305-00-000-3669 5305-00-000-3830 5305-00-000-3831

SUBSTITUTES & CROSS-REFERENCES 4

HT4027-4-21Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

WC4027-4-21Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

11923-4-21Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

ST3M668-4-21Same 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 ST3M557-4-21?

ST3M557-4-21 is a SCREW,CLOSE TOLERANCE.

What parts can replace ST3M557-4-21?

There are 4 known substitutes for ST3M557-4-21: HT4027-4-21, WC4027-4-21, 11923-4-21 and 1 more. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M557-4-21?

ST3M557-4-21 is cataloged in the U.S. Government catalog under NSN 5305-01-591-0047. This indicates validated use in U.S. government and defense supply chains.

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