121557-7-7X — SCREW,SHOULDER

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

121557-7-7X: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP E4340 OVERALL, head_style: FLAT COUNTERSUNK, thread_class: 3A A, head_diameter: 0.825 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN, thread_length: 0.528 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-448-2847, 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

121557-7-7X

NSN: 5305-01-448-2847
FSC: 5305 — Screws
CAGE: 56878 — SPS TECHNOLOGIES, LLC DBA PB FASTENERS (USA)

SPECIFICATIONS

material	STEEL COMP E4340 OVERALL
head_style	FLAT COUNTERSUNK
thread_class	3A A
head_diameter	0.825 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN
thread_length	0.528 INCHES MAXIMUM IN
shoulder_shape	ROUND FIRST SHOULDER
fastener_length	0.951 INCHES MINIMUM AND 0.981 INCHES MAXIMUM IN
shoulder_length	0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM FIRST SHOULDER IN
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
shoulder_diameter	0.4516 INCHES MINIMUM AND 0.4526 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatment	CADMIUM OVERALL
NSN	5305-01-448-2847

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 0.951 INCHES MINIMUM AND 0.981 INCHES MAXIMUM IN

•

SHOULDER LENGTH: 0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM FIRST SHOULDER IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL

•

SHOULDER DIAMETER: 0.4516 INCHES MINIMUM AND 0.4526 INCHES MAXIMUM FIRST SHOULDER IN

•

THREAD LENGTH: 0.528 INCHES MAXIMUM IN

•

SHOULDER SHAPE: ROUND FIRST SHOULDER

•

MATERIAL DOCUMENT AND CLASSIFICATION: AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL

•

NOMINAL THREAD DIAMETER: 0.4375 INCHES IN

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	0.951 INCHES MINIMUM AND 0.981 INCHES MAXIMUM IN
SHOULDER LENGTH	0.428 INCHES MINIMUM AND 0.448 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	NAS 672 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
SHOULDER DIAMETER	0.4516 INCHES MINIMUM AND 0.4526 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH	0.528 INCHES MAXIMUM IN
SHOULDER SHAPE	ROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATION	AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
NOMINAL THREAD DIAMETER	0.4375 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK
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 3

HO44-7-7RReference document

Same NSN cross-reference

Reference document — Secondary reference

VT1693-7-7RReference document

Same NSN cross-reference

Reference document — Secondary reference

C7984-7-7RReference document

Same NSN cross-reference

Reference document — Vendor item drawing reference

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 121557-7-7X?

121557-7-7X is a SCREW,SHOULDER.

What parts can replace 121557-7-7X?

There are 3 known substitutes for 121557-7-7X: HO44-7-7R, VT1693-7-7R, C7984-7-7R. Substitute compatibility should be verified for your specific system.

What is the NSN for 121557-7-7X?

121557-7-7X is cataloged in the U.S. Government catalog under NSN 5305-01-448-2847. This indicates validated use in U.S. government and defense supply chains.

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