ST3M557-4-6 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M557-4-6: 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: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.249 INCHES NOMINAL 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 5305-01-253-4860, 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

ST3M557-4-6

NSN: 5305-01-253-4860
NIINs: 012534860, 015360106
FSC: 5305 — Screws
CAGE: 1V0G6 — ADEPT FASTENERS INC (USA)

SPECIFICATIONS

material	NICKEL ALLOY 718 OVERALL
head_style	OVAL COUNTERSUNK
grip_length	0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
thread_class	3A A
grip_diameter	0.249 INCHES NOMINAL IN
head_diameter	0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN
thread_length	0.406 INCHES NOMINAL IN
fastener_length	0.829 INCHES MINIMUM AND 0.859 INCHES MAXIMUM IN
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatment	PASSIVATE OVERALL
internal_drive_style	HIGH-TORQUE
NSN	5305-01-253-4860

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN

•

THREAD LENGTH: 0.469 INCHES NOMINAL IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

•

GRIP LENGTH: 0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN

•

GRIP DIAMETER: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	0.828 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN
THREAD LENGTH	0.469 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
GRIP LENGTH	0.365 INCHES MINIMUM AND 0.385 INCHES MAXIMUM IN
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
SURFACE TREATMENT	ALUMINUM OVERALL
MINIMUM TENSILE STRENGTH	7500 POUNDS PER SQUARE INCH LBS

SUBSTITUTES & CROSS-REFERENCES 2

HT4027-4-6Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

WC4027-4-6Reference document

Same NSN cross-reference

Reference document — Advisory reference — outside the item-of-supply concept

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 ST3M557-4-6?

ST3M557-4-6 is a SCREW,CLOSE TOLERANCE.

What parts can replace ST3M557-4-6?

There are 2 known substitutes for ST3M557-4-6: HT4027-4-6, WC4027-4-6. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M557-4-6?

ST3M557-4-6 is cataloged in the U.S. Government catalog under NSN 5305-01-253-4860. This indicates validated use in U.S. government and defense supply chains.

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