W21579 — SCREW,SHOULDER

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

W21579: SCREW,SHOULDER.

The SCREW,SHOULDER is a the manufacturer industrial component. Key specifications include material: STEEL COMP 303 OVERALL, head_style: PAN, thread_class: 2A A, head_diameter: 0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN, shoulder_shape: ROUND FIRST SHOULDER, fastener_length: 0.686 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 5305-01-080-2090, 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

W21579

NSN: 5305-01-080-2090
FSC: 5305 — Screws
CAGE: 70255 — EMERSON ELECTRIC CO ALCO CONTROLS DIV (USA)

SPECIFICATIONS

material	STEEL COMP 303 OVERALL
head_style	PAN
thread_class	2A A
head_diameter	0.240 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN
shoulder_shape	ROUND FIRST SHOULDER
fastener_length	0.686 INCHES NOMINAL IN
shoulder_length	0.404 INCHES MINIMUM AND 0.406 INCHES MAXIMUM FIRST SHOULDER IN
thread_direction	RIGHT-HAND
shoulder_diameter	0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM FIRST SHOULDER IN
surface_treatment	PASSIVATE OVERALL
internal_drive_style	SLOT
nominal_thread_diameter	0.138 INCHES IN
NSN	5305-01-080-2090

COMPONENT DIAGRAM

KEY FEATURES

•

FASTENER LENGTH: 0.686 INCHES NOMINAL IN

•

SHOULDER LENGTH: 0.404 INCHES MINIMUM AND 0.406 INCHES MAXIMUM FIRST SHOULDER IN

•

SHOULDER DIAMETER: 0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM FIRST SHOULDER IN

•

SHOULDER SHAPE: ROUND FIRST SHOULDER

•

NOMINAL THREAD DIAMETER: 0.138 INCHES IN

•

HEAD STYLE: PAN

•

THREAD DIRECTION: RIGHT-HAND

TECHNICAL CHARACTERISTICS

FASTENER LENGTH	0.686 INCHES NOMINAL IN
SHOULDER LENGTH	0.404 INCHES MINIMUM AND 0.406 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER	0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM FIRST SHOULDER IN
SHOULDER DIAMETER	0.137 INCHES MINIMUM AND 0.139 INCHES MAXIMUM OVERALL IN
SHOULDER SHAPE	ROUND FIRST SHOULDER
NOMINAL THREAD DIAMETER	0.138 INCHES IN
HEAD STYLE	PAN
THREAD DIRECTION	RIGHT-HAND
SURFACE TREATMENT	PASSIVATE OVERALL
INTERNAL DRIVE STYLE	SLOT

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

002314-0073-0001Reference 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 W21579?

W21579 is a SCREW,SHOULDER.

What parts can replace W21579?

There is 1 known substitute for W21579: 002314-0073-0001. Substitute compatibility should be verified for your specific system.

What is the NSN for W21579?

W21579 is cataloged in the U.S. Government catalog under NSN 5305-01-080-2090. This indicates validated use in U.S. government and defense supply chains.

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W21579 — SCREW,SHOULDER

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