ST3M557-6-16 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M557-6-16: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: NICKEL ALLOY 718 OVERALL, head_style: OVAL COUNTERSUNK, grip_length: 1.000 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.374 INCHES MINIMUM IN, head_diameter: 0.564 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-561-4686, 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

ST3M557-6-16

NSN: 5305-01-561-4686
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)

SPECIFICATIONS

material	NICKEL ALLOY 718 OVERALL
head_style	OVAL COUNTERSUNK
grip_length	1.000 INCHES NOMINAL IN
thread_class	3A A
grip_diameter	0.374 INCHES MINIMUM IN
head_diameter	0.564 INCHES NOMINAL IN
thread_length	0.641 INCHES NOMINAL IN
fastener_length	1.641 INCHES NOMINAL IN
thread_direction	RIGHT-HAND
countersink_angle	100.0 DEGREES NOMINAL
internal_drive_style	HIGH-TORQUE
end_item_identification	F15-AIRCRAFT
NSN	5305-01-561-4686

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 1.641 INCHES NOMINAL IN

•

THREAD LENGTH: 0.641 INCHES NOMINAL IN

•

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

•

NOMINAL THREAD DIAMETER: 0.375 INCHES IN

•

HEAD STYLE: OVAL COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

•

GRIP LENGTH: 1.000 INCHES NOMINAL IN

•

GRIP DIAMETER: 0.374 INCHES MINIMUM IN

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	1.641 INCHES NOMINAL IN
THREAD LENGTH	0.641 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.375 INCHES IN
HEAD STYLE	OVAL COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
GRIP LENGTH	1.000 INCHES NOMINAL IN
GRIP DIAMETER	0.374 INCHES MINIMUM IN
INTERNAL DRIVE STYLE	HIGH-TORQUE
COUNTERSINK ANGLE	100.0 DEGREES NOMINAL

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

HT4027-6-16Reference document

Same NSN cross-reference

Reference document — Secondary reference

11923-6-16Same 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 ST3M557-6-16?

ST3M557-6-16 is a SCREW,CLOSE TOLERANCE.

What parts can replace ST3M557-6-16?

There are 2 known substitutes for ST3M557-6-16: HT4027-6-16, 11923-6-16. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M557-6-16?

ST3M557-6-16 is cataloged in the U.S. Government catalog under NSN 5305-01-561-4686. This indicates validated use in U.S. government and defense supply chains.

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