51B581-4-1 — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

51B581-4-1: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL COMP 4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN, thread_class: 3A A, grip_diameter: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN, head_diameter: 0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-016-9638, 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

51B581-4-1

NSN: 5305-01-016-9638
FSC: 5305 — Screws
CAGE: 06725 — SPS TECHNOLOGIES, LLC DBA AIR INDUSTRIES COMPANY DIV AIR INDUSTRIES COMPANY (USA)

SPECIFICATIONS

material	STEEL COMP 4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OVERALL
head_style	FLAT COUNTERSUNK
grip_length	0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
thread_class	3A A
grip_diameter	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
head_diameter	0.389 INCHES MINIMUM AND 0.394 INCHES MAXIMUM IN
thread_length	0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN
surface_finish	32.0 MICROINCHES GRIP
fastener_length	0.362 INCHES MINIMUM AND 0.409 INCHES MAXIMUM IN
hardness_rating	39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
thread_direction	RIGHT-HAND
countersink_angle	100.0 DEGREES NOMINAL
NSN	5305-01-016-9638

COMPONENT DIAGRAM

KEY FEATURES

•

SURFACE FINISH: 32.0 MICROINCHES GRIP

•

FASTENER LENGTH: 0.362 INCHES MINIMUM AND 0.409 INCHES MAXIMUM IN

•

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

•

THREAD LENGTH: 0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN

•

HARDNESS RATING: 39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL

•

NOMINAL THREAD DIAMETER: 0.250 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK

•

THREAD DIRECTION: RIGHT-HAND

TECHNICAL CHARACTERISTICS

SURFACE FINISH	32.0 MICROINCHES GRIP
FASTENER LENGTH	0.362 INCHES MINIMUM AND 0.409 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN
HARDNESS RATING	39.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL
NOMINAL THREAD DIAMETER	0.250 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
THREAD DIRECTION	RIGHT-HAND
GRIP LENGTH	0.052 INCHES MINIMUM AND 0.072 INCHES MAXIMUM IN
GRIP DIAMETER	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN

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: Insurance item — stocked against contingency demandNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is 51B581-4-1?

51B581-4-1 is a SCREW,CLOSE TOLERANCE.

What is the NSN for 51B581-4-1?

51B581-4-1 is cataloged in the U.S. Government catalog under NSN 5305-01-016-9638. This indicates validated use in U.S. government and defense supply chains.

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51B581-4-1 — SCREW,CLOSE TOLERANCE

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