GS520CK4-08 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

GS520CK4-08: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4140 OR STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.394 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN, thread_length: 0.477 INCHES MINIMUM AND 0.636 INCHES MAXIMUM IN, surface_finish: 32.0 MICROINCHES GRIP. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-118-9593, 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

GS520CK4-08

NSN: 5305-01-118-9593
FSC: 5305 — Screws
CAGE: 58998 — FASTENER INNOVATION TECHNOLOGY, INC. DBA F I T (USA)

SPECIFICATIONS

material	STEEL COMP 4140 OR STEEL COMP 8740 OVERALL
head_style	FLAT COUNTERSUNK
thread_class	3A A
head_diameter	0.394 INCHES MINIMUM AND 0.404 INCHES MAXIMUM IN
thread_length	0.477 INCHES MINIMUM AND 0.636 INCHES MAXIMUM IN
surface_finish	32.0 MICROINCHES GRIP
fastener_length	1.187 INCHES MINIMUM AND 1.207 INCHES MAXIMUM IN
special_features	THREADS TO BE DOUBLE LEAD
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
surface_treatment	CADMIUM AND CHROMATE OVERALL
width_across_flats	0.1409 INCHES MINIMUM AND 0.1426 INCHES MAXIMUM IN
NSN	5305-01-118-9593

COMPONENT DIAGRAM

KEY FEATURES

•

SURFACE FINISH: 32.0 MICROINCHES GRIP

•

WIDTH ACROSS FLATS: 0.1409 INCHES MINIMUM AND 0.1426 INCHES MAXIMUM IN

•

FASTENER LENGTH: 1.187 INCHES MINIMUM AND 1.207 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416 TY 2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL

•

THREAD LENGTH: 0.477 INCHES MINIMUM AND 0.636 INCHES MAXIMUM IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK

TECHNICAL CHARACTERISTICS

SURFACE FINISH	32.0 MICROINCHES GRIP
WIDTH ACROSS FLATS	0.1409 INCHES MINIMUM AND 0.1426 INCHES MAXIMUM IN
FASTENER LENGTH	1.187 INCHES MINIMUM AND 1.207 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416 TY 2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.477 INCHES MINIMUM AND 0.636 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
SPECIAL FEATURES	THREADS TO BE DOUBLE LEAD

OTHER ITEMS IN FSC 5305 — Screws

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

5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753

SUBSTITUTES & CROSS-REFERENCES 1

CA21070-4-8HSReference document

Same NSN cross-reference

Reference document — Secondary reference

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 GS520CK4-08?

GS520CK4-08 is a SCREW,CAP,SOCKET HEAD.

What parts can replace GS520CK4-08?

There is 1 known substitute for GS520CK4-08: CA21070-4-8HS. Substitute compatibility should be verified for your specific system.

What is the NSN for GS520CK4-08?

GS520CK4-08 is cataloged in the U.S. Government catalog under NSN 5305-01-118-9593. This indicates validated use in U.S. government and defense supply chains.

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