550999 — REGULATOR,AIR PRESSURE,AIRCRAFT

✓ Government record, cited

— · COMPONENT

PRODUCT OVERVIEW

550999: REGULATOR,AIR PRESSURE,AIRCRAFT.

REGULATOR,AIR PRESSURE,AIRCRAFT. Key specifications include material: ALUMINUM, edge_radius: 1.562 INCHES NOMINAL IN, end_thickness: 1.375 INCHES NOMINAL IN, fabrication_method: CAST, end_hole_inside_diameter: 0.500 INCHES NOMINAL IN, shaft_connecting_end_style: AUTOMOTIVE STANDARD SPLIT BEARING 2 BOLT. This part is cataloged in the U.S.

Government catalog under NSN 4130-00-876-7256, 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

550999

NSN: 4130-00-876-7256
NIINs: 008767256, 009703764
FSC: 4130 — Refrigeration and Air Conditioning Components
CAGE: 11247 — LODESTONE CORP DIV OF FEDDERS CORP (USA)

SPECIFICATIONS

material	ALUMINUM
edge_radius	1.562 INCHES NOMINAL IN
end_thickness	1.375 INCHES NOMINAL IN
fabrication_method	CAST
end_hole_inside_diameter	0.500 INCHES NOMINAL IN
shaft_connecting_end_style	AUTOMOTIVE STANDARD SPLIT BEARING 2 BOLT
piston_end_connection_style	SMALL ENGINE AND AUTOMOTIVE STANDARD
shaft_connecting_end_bearing	NOT INCLUDED
piston_connecting_end_bearing	NOT INCLUDED
body_width_at_shaft_connecting_end	1.750 INCHES NOMINAL IN
body_thickness_at_shaft_connecting_end	0.688 INCHES NOMINAL IN
body_thickness_at_piston_connecting_end	0.688 INCHES NOMINAL IN
NSN	4130-00-876-7256

COMPONENT DIAGRAM

KEY FEATURES

•

END THICKNESS: 1.375 INCHES NOMINAL IN

•

BODY WIDTH AT SHAFT CONNECTING END: 1.750 INCHES NOMINAL IN

•

SHAFT CONNECTING END LUBRICATION DRILL FEATURE: NOT INCLUDED

•

SHAFT CONNECTING END BEARING: NOT INCLUDED

•

PISTON CONNECTING END BEARING: NOT INCLUDED

•

BODY THICKNESS AT PISTON CONNECTING END: 0.688 INCHES NOMINAL IN

•

END HOLE INSIDE DIAMETER: 0.500 INCHES NOMINAL IN

•

BODY THICKNESS AT SHAFT CONNECTING END: 0.688 INCHES NOMINAL IN

TECHNICAL CHARACTERISTICS

END THICKNESS	1.375 INCHES NOMINAL IN
BODY WIDTH AT SHAFT CONNECTING END	1.750 INCHES NOMINAL IN
SHAFT CONNECTING END LUBRICATION DRILL FEATURE	NOT INCLUDED
SHAFT CONNECTING END BEARING	NOT INCLUDED
PISTON CONNECTING END BEARING	NOT INCLUDED
BODY THICKNESS AT PISTON CONNECTING END	0.688 INCHES NOMINAL IN
END HOLE INSIDE DIAMETER	0.500 INCHES NOMINAL IN
BODY THICKNESS AT SHAFT CONNECTING END	0.688 INCHES NOMINAL IN
SHAFT CONNECTING END STYLE	AUTOMOTIVE STANDARD SPLIT BEARING 2 BOLT
MATERIAL	ALUMINUM

SUBSTITUTES & CROSS-REFERENCES 3

20263RReference document

Same NSN cross-reference

Reference document — Design control — primary reference

523487Reference document

Same NSN cross-reference

Reference document — Vendor item drawing reference

522821Reference document

Same NSN cross-reference

Reference document — Secondary 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 550999?

550999 is a REGULATOR,AIR PRESSURE,AIRCRAFT.

What parts can replace 550999?

There are 3 known substitutes for 550999: 20263R, 523487, 522821. Substitute compatibility should be verified for your specific system.

What is the NSN for 550999?

550999 is cataloged in the U.S. Government catalog under NSN 4130-00-876-7256. This indicates validated use in U.S. government and defense supply chains.

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550999 — REGULATOR,AIR PRESSURE,AIRCRAFT

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