ST3M557-4-4 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M557-4-4: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL CORROSION RESISTING OVERALL, head_style: OVAL COUNTERSUNK, grip_length: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN, head_diameter: 0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-133-1572, 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

ST3M557-4-4

NSN: 5305-01-133-1572
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)

SPECIFICATIONS

material	STEEL CORROSION RESISTING OVERALL
head_style	OVAL COUNTERSUNK
grip_length	0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
thread_class	3A A
grip_diameter	0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
head_diameter	0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
thread_length	0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
fastener_length	0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
internal_drive_style	HIGH-TORQUE
nominal_thread_diameter	0.250 INCHES IN
NSN	5305-01-133-1572

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN

•

THREAD LENGTH: 0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: 23-118 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

•

HEAD STYLE: OVAL COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

•

GRIP LENGTH: 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN

•

GRIP DIAMETER: 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	0.703 INCHES MINIMUM AND 0.750 INCHES MAXIMUM IN
THREAD LENGTH	0.443 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION	23-118 FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	OVAL COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
GRIP LENGTH	0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM IN
GRIP DIAMETER	0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
INTERNAL DRIVE STYLE	HIGH-TORQUE
COUNTERSINK ANGLE	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM

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 2

HT4027-4-4Reference document

Same NSN cross-reference

Reference document — Secondary reference

10115341Reference document

Same NSN cross-reference

Reference document — Informative reference only

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Insurance item — stocked against contingency demandNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is ST3M557-4-4?

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

What parts can replace ST3M557-4-4?

There are 2 known substitutes for ST3M557-4-4: HT4027-4-4, 10115341. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M557-4-4?

ST3M557-4-4 is cataloged in the U.S. Government catalog under NSN 5305-01-133-1572. This indicates validated use in U.S. government and defense supply chains.

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