CA21166-4-2 — THUMBSCREW

✓ Government record, cited

— · BOLT SCREW

PRODUCT OVERVIEW

CA21166-4-2: THUMBSCREW.

The THUMBSCREW is a the manufacturer industrial component. Key specifications include head_style: THUMB NO. 6, head_height: 0.625 INCHES NOMINAL IN, point_style: POINTLESS, thread_class: 3A A, thread_length: 0.487 INCHES NOMINAL IN, shoulder_shape: ROUND FIRST SHOULDER.

This part is cataloged in the U.S. Government catalog under NSN 5305-01-174-0519, 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

CA21166-4-2

NSN: 5305-01-174-0519
FSC: 5305 — Screws
CAGE: 29372 — HOWMET GLOBAL FASTENING SYSTEMS INC. DIV TRIDAIR PRODUCTS (USA)

SPECIFICATIONS

material	STEEL COMP 302B OR STEEL COMP 303 OR STEEL COMP 303 PLUS X OR STEEL COMP 303SE OR STEEL COMP 303CU OR STEEL COMP 303MA OR STEEL COMP 304 OR STEEL COMP 304L TOP OF HEAD
head_style	THUMB NO. 6
head_height	0.625 INCHES NOMINAL IN
point_style	POINTLESS
thread_class	3A A
thread_length	0.487 INCHES NOMINAL IN
shoulder_shape	ROUND FIRST SHOULDER
fastener_length	1.059 INCHES NOMINAL IN
shoulder_length	0.150 INCHES MINIMUM AND 0.290 INCHES MAXIMUM FIRST SHOULDER IN
special_features	0.112 DIA HOLE FOR PLUG AT THREADED END,0.035 IN. TO 0.045 IN. WIDE BY 0.024 IN. TO 0.034 IN. DEEP SPLINE 3 PLACES,SPACED 120 DEGREES APART IN
thread_direction	RIGHT-HAND
shoulder_diameter	0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM FIRST SHOULDER IN
NSN	5305-01-174-0519

COMPONENT DIAGRAM

KEY FEATURES

•

HEAD HEIGHT: 0.625 INCHES NOMINAL IN

•

FASTENER LENGTH: 1.059 INCHES NOMINAL IN

•

SHOULDER LENGTH: 0.150 INCHES MINIMUM AND 0.290 INCHES MAXIMUM FIRST SHOULDER IN

•

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE TOP OF HEAD

•

SHOULDER DIAMETER: 0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM FIRST SHOULDER IN

•

THREAD LENGTH: 0.487 INCHES NOMINAL IN

•

SHOULDER SHAPE: ROUND FIRST SHOULDER

TECHNICAL CHARACTERISTICS

HEAD HEIGHT	0.625 INCHES NOMINAL IN
FASTENER LENGTH	1.059 INCHES NOMINAL IN
SHOULDER LENGTH	0.150 INCHES MINIMUM AND 0.290 INCHES MAXIMUM FIRST SHOULDER IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE TOP OF HEAD
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION	QQ-P-416 TY 2 CL 2 MIL SPEC SINGLE TREATMENT RESPONSE FASTENER
SHOULDER DIAMETER	0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM FIRST SHOULDER IN
THREAD LENGTH	0.487 INCHES NOMINAL IN
SHOULDER SHAPE	ROUND FIRST SHOULDER
MATERIAL DOCUMENT AND CLASSIFICATION	MIL-S-6049 MIL SPEC SINGLE MATERIAL RESPONSE OR MIL-S-5626 MIL SPEC SINGLE MATERIAL RESPONSE FASTENER
NOMINAL THREAD DIAMETER	0.250 INCHES IN

OTHER ITEMS IN FSC 5305 — Screws

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5305-00-001-5016 5305-00-001-9160 5305-00-001-9629 5305-00-001-9742 5305-00-001-9768 5305-00-003-4306 5305-00-003-6694 5305-00-003-6753

SUBSTITUTES & CROSS-REFERENCES 2

FIT7833-4-2Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

GS522Y4-2Reference document

Same NSN cross-reference

Reference document — Vendor item drawing reference

LIFECYCLE

NSN statusActive· U.S. Government catalog

Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is CA21166-4-2?

CA21166-4-2 is a THUMBSCREW.

What parts can replace CA21166-4-2?

There are 2 known substitutes for CA21166-4-2: FIT7833-4-2, GS522Y4-2. Substitute compatibility should be verified for your specific system.

What is the NSN for CA21166-4-2?

CA21166-4-2 is cataloged in the U.S. Government catalog under NSN 5305-01-174-0519. This indicates validated use in U.S. government and defense supply chains.

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