77988-5-2 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

77988-5-2: 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 4340 OR STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.261 INCHES NOMINAL IN, thread_length: 0.312 INCHES NOMINAL IN, fastener_length: 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-385-5889, 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

77988-5-2

NSN: 5305-01-385-5889
FSC: 5305 — Screws
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)

SPECIFICATIONS

material	STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 8740 OVERALL
head_style	FLAT COUNTERSUNK
thread_class	3A A
head_diameter	0.261 INCHES NOMINAL IN
thread_length	0.312 INCHES NOMINAL IN
fastener_length	0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
features_provided	CETYL ALCOHOL LUBRICANT
surface_treatment	CADMIUM AND CHROMATE OVERALL
width_across_flats	0.161 INCHES NOMINAL IN
internal_drive_style	HEXAGON
NSN	5305-01-385-5889

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.161 INCHES NOMINAL IN

•

FASTENER LENGTH: 0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-416, TYPE 2, CLASS 2 FED SPEC ALL TREATMENT RESPONSES OVERALL

•

THREAD LENGTH: 0.312 INCHES NOMINAL IN

•

MATERIAL DOCUMENT AND CLASSIFICATION: MIL-S-5652 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL

•

NOMINAL THREAD DIAMETER: 0.164 INCHES IN

•

FEATURES PROVIDED: CETYL ALCOHOL LUBRICANT

•

HEAD STYLE: FLAT COUNTERSUNK

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.161 INCHES NOMINAL IN
FASTENER LENGTH	0.427 INCHES MINIMUM AND 0.447 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416, TYPE 2, CLASS 2 FED SPEC ALL TREATMENT RESPONSES OVERALL
THREAD LENGTH	0.312 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-5652 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-5000 MIL SPEC 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 3RD MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.164 INCHES IN
FEATURES PROVIDED	CETYL ALCOHOL LUBRICANT
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
COLOR	BRONZE OVERALL

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 2

MB164PB-5-2Reference document

Same NSN cross-reference

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

GB510CM08-2Reference 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 77988-5-2?

77988-5-2 is a SCREW,CAP,SOCKET HEAD.

What parts can replace 77988-5-2?

There are 2 known substitutes for 77988-5-2: MB164PB-5-2, GB510CM08-2. Substitute compatibility should be verified for your specific system.

What is the NSN for 77988-5-2?

77988-5-2 is cataloged in the U.S. Government catalog under NSN 5305-01-385-5889. This indicates validated use in U.S. government and defense supply chains.

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77988-5-2 — SCREW,CAP,SOCKET HEAD

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