ST3M557-3-17 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M557-3-17: 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: 1.062 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN, head_diameter: 0.293 INCHES MINIMUM AND 0.301 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-521-9583, 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

ST3M557-3-17

NSN: 5305-01-521-9583
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)

SPECIFICATIONS

material	NICKEL ALLOY 718 OVERALL
head_style	FLAT COUNTERSUNK
grip_length	1.062 INCHES NOMINAL IN
thread_class	3A A
grip_diameter	0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
head_diameter	0.293 INCHES MINIMUM AND 0.301 INCHES MAXIMUM IN
thread_length	0.313 INCHES NOMINAL IN
fastener_length	1.468 INCHES NOMINAL IN
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES NOMINAL AND 101.0 DEGREES MAXIMUM
surface_treatment	PASSIVATE OVERALL
internal_drive_style	TORX
NSN	5305-01-521-9583

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 1.468 INCHES NOMINAL IN

•

THREAD LENGTH: 0.313 INCHES NOMINAL IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: BPS-F-69 MFR REF SINGLE MATERIAL RESPONSE OVERALL

•

SPLINE MAJOR DIAMETER: 0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN

•

NOMINAL THREAD DIAMETER: 0.190 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

•

GRIP LENGTH: 1.062 INCHES NOMINAL IN

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	1.468 INCHES NOMINAL IN
THREAD LENGTH	0.313 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	BPS-F-69 MFR REF SINGLE MATERIAL RESPONSE OVERALL
SPLINE MAJOR DIAMETER	0.154 INCHES MINIMUM AND 0.156 INCHES MAXIMUM IN
NOMINAL THREAD DIAMETER	0.190 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
GRIP LENGTH	1.062 INCHES NOMINAL IN
GRIP DIAMETER	0.1885 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN
SURFACE TREATMENT	PASSIVATE OVERALL

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

ST3M557Reference document

Same NSN cross-reference

Reference document — Drawing number reference only

HT4027-3-17Same 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 ST3M557-3-17?

ST3M557-3-17 is a SCREW,CLOSE TOLERANCE.

What parts can replace ST3M557-3-17?

There are 2 known substitutes for ST3M557-3-17: ST3M557, HT4027-3-17. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M557-3-17?

ST3M557-3-17 is cataloged in the U.S. Government catalog under NSN 5305-01-521-9583. This indicates validated use in U.S. government and defense supply chains.

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