121557-4-A9BX — SCREW,CLOSE TOLERANCE

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

121557-4-A9BX: SCREW,CLOSE TOLERANCE.

The SCREW,CLOSE TOLERANCE is a the manufacturer industrial component. Key specifications include material: STEEL OVERALL, head_style: FLAT COUNTERSUNK, grip_length: 0.5625 INCHES NOMINAL IN, head_height: 0.108 INCHES NOMINAL IN, thread_class: 3A A, grip_diameter: 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-692-4567, 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

121557-4-A9BX

NSN: 5305-01-692-4567
FSC: 5305 — Screws
CAGE: 80539 — SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA (USA)

SPECIFICATIONS

material	STEEL OVERALL
head_style	FLAT COUNTERSUNK
grip_length	0.5625 INCHES NOMINAL IN
head_height	0.108 INCHES NOMINAL IN
thread_class	3A A
grip_diameter	0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN
head_diameter	0.447 INCHES MINIMUM AND 0.507 INCHES MAXIMUM IN
thread_length	0.370 INCHES NOMINAL IN
surface_finish	32.0 MICROINCHES OVERALL
fastener_length	0.9175 INCHES MINIMUM AND 0.9475 INCHES MAXIMUM IN
hardness_rating	46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
thread_direction	RIGHT-HAND
NSN	5305-01-692-4567

COMPONENT DIAGRAM

KEY FEATURES

•

SURFACE FINISH: 32.0 MICROINCHES OVERALL

•

HEAD HEIGHT: 0.108 INCHES NOMINAL IN

•

FASTENER LENGTH: 0.9175 INCHES MINIMUM AND 0.9475 INCHES MAXIMUM IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-S-83488 TY II,CL 3 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-L-46010 TY I MIL SPEC 2ND TREATMENT RESPONSE OVERALL

•

THREAD LENGTH: 0.370 INCHES NOMINAL IN

•

HARDNESS RATING: 46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL

•

MATERIAL DOCUMENT AND CLASSIFICATION: HI ALLOY STEEL PER AMS6487 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL

•

SINGLE SHEAR STRENGTH: ERR-060

TECHNICAL CHARACTERISTICS

SURFACE FINISH	32.0 MICROINCHES OVERALL
HEAD HEIGHT	0.108 INCHES NOMINAL IN
FASTENER LENGTH	0.9175 INCHES MINIMUM AND 0.9475 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	MIL-S-83488 TY II,CL 3 MIL SPEC 1ST TREATMENT RESPONSE AND MIL-L-46010 TY I MIL SPEC 2ND TREATMENT RESPONSE OVERALL
THREAD LENGTH	0.370 INCHES NOMINAL IN
HARDNESS RATING	46.0 ROCKWELL C MINIMUM AND 50.0 ROCKWELL C MAXIMUM OVERALL
MATERIAL DOCUMENT AND CLASSIFICATION	HI ALLOY STEEL PER AMS6487 AEROSPACE MATERIAL SPEC STD SINGLE MATERIAL RESPONSE OVERALL
SINGLE SHEAR STRENGTH	ERR-060
NOMINAL THREAD DIAMETER	0.2500 INCHES IN
FEATURES PROVIDED	DRY FILM LUBRICANT

SUBSTITUTES & CROSS-REFERENCES 3

VT1693AS4-9XSame NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

C7984Reference document

Same NSN cross-reference

Reference document — Drawing number reference only

C7984B4-9RReference document

Same NSN cross-reference

Reference document — Vendor item drawing 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 121557-4-A9BX?

121557-4-A9BX is a SCREW,CLOSE TOLERANCE.

What parts can replace 121557-4-A9BX?

There are 3 known substitutes for 121557-4-A9BX: VT1693AS4-9X, C7984, C7984B4-9R. Substitute compatibility should be verified for your specific system.

What is the NSN for 121557-4-A9BX?

121557-4-A9BX is cataloged in the U.S. Government catalog under NSN 5305-01-692-4567. This indicates validated use in U.S. government and defense supply chains.

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