20-1/2 ASTMA105 — THERMAL RELEASE,CIRCUIT BREAKER

✓ Government record, cited

— · HOSE FITTING

PRODUCT OVERVIEW

20-1/2 ASTMA105: THERMAL RELEASE,CIRCUIT BREAKER.

THERMAL RELEASE,CIRCUIT BREAKER. Key specifications include material: STEEL, thickness: 0.437 INCHES NOMINAL IN, neck_height: 0.188 INCHES NOMINAL IN, socket_depth: 0.375 INCHES NOMINAL IN, flange_diameter: 3.500 INCHES NOMINAL IN, socket_diameter: 0.880 INCHES NOMINAL IN. This part is cataloged in the U.S.

Government catalog under NSN 4730-01-311-1000, 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

20-1/2 ASTMA105

NSN: 4730-01-311-1000
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 34646 — ATI LADISH LLC DBA ATI WAH CHANG DIV ATI FORGED PRODUCTS - CUDAHY (USA)

SPECIFICATIONS

material	STEEL
thickness	0.437 INCHES NOMINAL IN
neck_height	0.188 INCHES NOMINAL IN
socket_depth	0.375 INCHES NOMINAL IN
flange_diameter	3.500 INCHES NOMINAL IN
socket_diameter	0.880 INCHES NOMINAL IN
style_designator	ROUND, ONE BOLT HOLE CIRCLE
bolt_hole_diameter	0.500 INCHES NOMINAL IN
bolt_hole_quantity	4
raised_face_height	0.062 INCHES NOMINAL IN
bolt_circle_diameter	2.375 INCHES NOMINAL IN
flange_section_style	RAISED FACE, SOCKET NECK
NSN	4730-01-311-1000

COMPONENT DIAGRAM

KEY FEATURES

•

SOCKET DIAMETER: 0.880 INCHES NOMINAL IN

•

FLANGE DIAMETER: 3.500 INCHES NOMINAL IN

•

FACE SEATING SURFACE CONDITION: MACHINED

•

NOMINAL PIPE SIZE FOR WHICH DESIGNED: 0.500 INCHES IN

•

SOCKET DEPTH: 0.375 INCHES NOMINAL IN

•

FLANGE SECTION STYLE: RAISED FACE, SOCKET NECK

•

STYLE DESIGNATOR: ROUND, ONE BOLT HOLE CIRCLE

•

BOLT HOLE DIAMETER: 0.500 INCHES NOMINAL IN

TECHNICAL CHARACTERISTICS

SOCKET DIAMETER	0.880 INCHES NOMINAL IN
FLANGE DIAMETER	3.500 INCHES NOMINAL IN
FACE SEATING SURFACE CONDITION	MACHINED
NOMINAL PIPE SIZE FOR WHICH DESIGNED	0.500 INCHES IN
SOCKET DEPTH	0.375 INCHES NOMINAL IN
FLANGE SECTION STYLE	RAISED FACE, SOCKET NECK
STYLE DESIGNATOR	ROUND, ONE BOLT HOLE CIRCLE
BOLT HOLE DIAMETER	0.500 INCHES NOMINAL IN
NECK HEIGHT	0.188 INCHES NOMINAL IN
MATERIAL DOCUMENT AND CLASSIFICATION	ASTM A105 ASSN STD SINGLE MATERIAL RESPONSE

OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings

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

4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008

SUBSTITUTES & CROSS-REFERENCES 1

B16.5Reference 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 20-1/2 ASTMA105?

20-1/2 ASTMA105 is a THERMAL RELEASE,CIRCUIT BREAKER.

What parts can replace 20-1/2 ASTMA105?

There is 1 known substitute for 20-1/2 ASTMA105: B16.5. Substitute compatibility should be verified for your specific system.

What is the NSN for 20-1/2 ASTMA105?

20-1/2 ASTMA105 is cataloged in the U.S. Government catalog under NSN 4730-01-311-1000. This indicates validated use in U.S. government and defense supply chains.

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