2678991-4 — SCREW,SHOULDER

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

2678991-4: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: HEXAGON, head_height: 0.094 INCHES NOMINAL IN, thread_class: 2A A, thread_length: 0.158 INCHES MINIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-185-4637, 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

2678991-4

NSN: 5305-01-185-4637
FSC: 5305 — Screws
CAGE: 10001 — NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER (USA)

SPECIFICATIONS

material	STEEL COMP 303 OVERALL
head_style	HEXAGON
head_height	0.094 INCHES NOMINAL IN
thread_class	2A A
thread_length	0.158 INCHES MINIMUM IN
shoulder_shape	ROUND FIRST SHOULDER
fastener_length	0.375 INCHES NOMINAL IN
shoulder_length	0.125 INCHES NOMINAL FIRST SHOULDER IN
thread_direction	RIGHT-HAND
shoulder_diameter	0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatment	PASSIVATE OVERALL
width_between_flats	0.500 INCHES NOMINAL IN
NSN	5305-01-185-4637

COMPONENT DIAGRAM

KEY FEATURES

•

HEAD HEIGHT: 0.094 INCHES NOMINAL IN

•

FASTENER LENGTH: 0.375 INCHES NOMINAL IN

•

SHOULDER LENGTH: 0.125 INCHES NOMINAL FIRST SHOULDER IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL

•

SHOULDER DIAMETER: 0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM FIRST SHOULDER IN

•

THREAD LENGTH: 0.158 INCHES MINIMUM IN

•

SHOULDER SHAPE: ROUND FIRST SHOULDER

•

MATERIAL DOCUMENT AND CLASSIFICATION: ASTMA582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

TECHNICAL CHARACTERISTICS

HEAD HEIGHT	0.094 INCHES NOMINAL IN
FASTENER LENGTH	0.375 INCHES NOMINAL IN
SHOULDER LENGTH	0.125 INCHES NOMINAL FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER	0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH	0.158 INCHES MINIMUM IN
SHOULDER SHAPE	ROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATION	ASTMA582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.190 INCHES IN
HEAD STYLE	HEXAGON

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

No substitute or cross-reference records for this part.

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Terminal item — stock exhausted; no further procurementNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 2678991-4?

2678991-4 is a SCREW,SHOULDER.

What is the NSN for 2678991-4?

2678991-4 is cataloged in the U.S. Government catalog under NSN 5305-01-185-4637. This indicates validated use in U.S. government and defense supply chains.

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2678991-4 — SCREW,SHOULDER

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