3M991-4-7 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

3M991-4-7: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT CHAMFER, head_height: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN, thread_length: 0.390 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-255-3590, 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

3M991-4-7

NSN: 5305-01-255-3590
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)

SPECIFICATIONS

material	STEEL OVERALL
head_style	FLAT CHAMFER
head_height	0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
thread_class	3A A
head_diameter	0.365 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN
thread_length	0.390 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
fastener_length	0.838 INCHES MINIMUM AND 0.888 INCHES MAXIMUM IN
hardness_rating	38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
special_features	OPTIONAL KNURLED HEAD
thread_direction	RIGHT-HAND
surface_treatment	CADMIUM AND CHROMATE OVERALL
width_across_flats	0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
NSN	5305-01-255-3590

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN

•

HEAD HEIGHT: 0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN

•

FASTENER LENGTH: 0.838 INCHES MINIMUM AND 0.888 INCHES MAXIMUM IN

•

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

•

THREAD LENGTH: 0.390 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN

•

HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

•

HEAD STYLE: FLAT CHAMFER

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.188 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
HEAD HEIGHT	0.244 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
FASTENER LENGTH	0.838 INCHES MINIMUM AND 0.888 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416 TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.390 INCHES MINIMUM AND 0.460 INCHES MAXIMUM IN
HARDNESS RATING	38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	FLAT CHAMFER
THREAD DIRECTION	RIGHT-HAND
SPECIAL FEATURES	OPTIONAL KNURLED HEAD

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

No substitute or cross-reference records for this part.

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 3M991-4-7?

3M991-4-7 is a SCREW,CAP,SOCKET HEAD.

What is the NSN for 3M991-4-7?

3M991-4-7 is cataloged in the U.S. Government catalog under NSN 5305-01-255-3590. This indicates validated use in U.S. government and defense supply chains.

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3M991-4-7 — SCREW,CAP,SOCKET HEAD

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