3M991N3L9 — SCREW,CAP,SOCKET HEAD

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

3M991N3L9: SCREW,CAP,SOCKET HEAD.

The SCREW,CAP,SOCKET HEAD is a the manufacturer industrial component. Key specifications include material: IRON ALLOY 660 OVERALL, head_style: FLAT CHAMFER, head_height: 0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.303 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN, thread_length: 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-303-9650, 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

3M991N3L9

NSN: 5305-01-303-9650
FSC: 5305 — Screws
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)

SPECIFICATIONS

material	IRON ALLOY 660 OVERALL
head_style	FLAT CHAMFER
head_height	0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
thread_class	3A A
head_diameter	0.303 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN
thread_length	0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN
fastener_length	0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM IN
hardness_rating	80.0 ROCKWELL B MINIMUM OVERALL
thread_direction	RIGHT-HAND
surface_treatment	PASSIVATE OVERALL
width_across_flats	0.156 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN
internal_drive_style	HEXAGON
NSN	5305-01-303-9650

COMPONENT DIAGRAM

KEY FEATURES

•

WIDTH ACROSS FLATS: 0.156 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN

•

HEAD HEIGHT: 0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN

•

FASTENER LENGTH: 0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM IN

•

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

•

THREAD LENGTH: 0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN

•

HARDNESS RATING: 80.0 ROCKWELL B MINIMUM OVERALL

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

•

NOMINAL THREAD DIAMETER: 0.190 INCHES IN

TECHNICAL CHARACTERISTICS

WIDTH ACROSS FLATS	0.156 INCHES MINIMUM AND 0.159 INCHES MAXIMUM IN
HEAD HEIGHT	0.185 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN
FASTENER LENGTH	0.954 INCHES MINIMUM AND 0.984 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.381 INCHES MINIMUM AND 0.431 INCHES MAXIMUM IN
HARDNESS RATING	80.0 ROCKWELL B MINIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5737 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.190 INCHES IN
HEAD STYLE	FLAT CHAMFER
THREAD DIRECTION	RIGHT-HAND

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 1

3M991N3-9Reference document

Same NSN cross-reference

Reference document — Secondary reference

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 3M991N3L9?

3M991N3L9 is a SCREW,CAP,SOCKET HEAD.

What parts can replace 3M991N3L9?

There is 1 known substitute for 3M991N3L9: 3M991N3-9. Substitute compatibility should be verified for your specific system.

What is the NSN for 3M991N3L9?

3M991N3L9 is cataloged in the U.S. Government catalog under NSN 5305-01-303-9650. This indicates validated use in U.S. government and defense supply chains.

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