ST3M653C6-21A — SCREW,SHOULDER

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

ST3M653C6-21A: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP XM-13 OVERALL, head_style: FLAT COUNTERSUNK UNDERCUT, head_height: 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN, thread_class: 3A A, head_diameter: 0.756 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN, thread_length: 0.641 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-568-1024, 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

ST3M653C6-21A

NSN: 5305-01-568-1024
FSC: 5305 — Screws
CAGE: 76301 — THE BOEING COMPANY DIV DEFENSE (USA)

SPECIFICATIONS

material	STEEL COMP XM-13 OVERALL
head_style	FLAT COUNTERSUNK UNDERCUT
head_height	0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN
thread_class	3A A
head_diameter	0.756 INCHES MINIMUM AND 0.760 INCHES MAXIMUM IN
thread_length	0.641 INCHES NOMINAL IN
shoulder_shape	ROUND FIRST SHOULDER
fastener_length	1.953 INCHES NOMINAL IN
shoulder_length	1.129 INCHES MINIMUM AND 1.151 INCHES MAXIMUM FIRST SHOULDER IN
special_features	FURNISHED WITH ONE RUBBER O RING
thread_direction	RIGHT-HAND
countersink_angle	99.0 DEGREES MINIMUM AND 101.0 DEGREES MAXIMUM
NSN	5305-01-568-1024

COMPONENT DIAGRAM

KEY FEATURES

•

HEAD HEIGHT: 0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN

•

FASTENER LENGTH: 1.953 INCHES NOMINAL IN

•

SHOULDER LENGTH: 1.129 INCHES MINIMUM AND 1.151 INCHES MAXIMUM FIRST SHOULDER IN

•

SHOULDER DIAMETER: 0.389 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN

•

THREAD LENGTH: 0.641 INCHES NOMINAL IN

•

SHOULDER SHAPE: ROUND FIRST SHOULDER

•

NOMINAL THREAD DIAMETER: 0.375 INCHES IN

•

HEAD STYLE: FLAT COUNTERSUNK UNDERCUT

TECHNICAL CHARACTERISTICS

HEAD HEIGHT	0.109 INCHES MINIMUM AND 0.111 INCHES MAXIMUM IN
FASTENER LENGTH	1.953 INCHES NOMINAL IN
SHOULDER LENGTH	1.129 INCHES MINIMUM AND 1.151 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER	0.389 INCHES MINIMUM AND 0.390 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH	0.641 INCHES NOMINAL IN
SHOULDER SHAPE	ROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER	0.375 INCHES IN
HEAD STYLE	FLAT COUNTERSUNK UNDERCUT
THREAD DIRECTION	RIGHT-HAND
SPECIAL FEATURES	FURNISHED WITH ONE RUBBER O RING

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 2

HT4020-6-21AXSame NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

11927C6-21ASame NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

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 ST3M653C6-21A?

ST3M653C6-21A is a SCREW,SHOULDER.

What parts can replace ST3M653C6-21A?

There are 2 known substitutes for ST3M653C6-21A: HT4020-6-21AX, 11927C6-21A. Substitute compatibility should be verified for your specific system.

What is the NSN for ST3M653C6-21A?

ST3M653C6-21A is cataloged in the U.S. Government catalog under NSN 5305-01-568-1024. This indicates validated use in U.S. government and defense supply chains.

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