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105959 — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

105959: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include special_features: 20X1/2SQ, end_item_identification: ALEX LAUNCHING SYSTEM SUPPORT. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-104-6234, 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
105959
NSN: 4820-00-104-6234
NIINs: 001046234, 008063703, 015337807
FSC: 4820 — Valves, Nonpowered
CAGE: 0BR59 — SIEMENS GOVERNMENT TECHNOLOGIES, INC. DBA SGT DRESSER-RAND DIV SGT DRESSER-RAND (USA)
SPECIFICATIONS
special_features20X1/2SQ
end_item_identificationALEX LAUNCHING SYSTEM SUPPORT
NSN4820-00-104-6234
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 105959 · OEM ⚠ VERIFY BEFORE ORDERING Gate valves = FULL OPEN or FULL CLOSE only — never throttle. Partial opening causes seat erosion and vibration. ✓ BROKER TIP Rising stem shows valve position visually — easier maintenance. Non-rising stem saves headroom. PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
FLANGE SEAT TO DISK END HEIGHT: 0.312 INCHES NOMINAL IN
•
FLANGE DIAMETER: 1.875 INCHES NOMINAL IN
•
BODY OUTSIDE DIAMETER: 1.496 INCHES MINIMUM AND 1.498 INCHES MAXIMUM IN
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STYLE DESIGNATOR: PLAIN FLANGED
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MATERIAL DOCUMENT AND CLASSIFICATION: 66,AISI 416/SAE 51416 FED STD ALL MATERIAL RESPONSES BODY
•
BODY INSIDE DIAMETER: 0.717 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN
•
SEAT RADIUS: 0.188 INCHES NOMINAL IN
•
UNDER FLANGE HEIGHT: 1.562 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
FLANGE SEAT TO DISK END HEIGHT0.312 INCHES NOMINAL IN
FLANGE DIAMETER1.875 INCHES NOMINAL IN
BODY OUTSIDE DIAMETER1.496 INCHES MINIMUM AND 1.498 INCHES MAXIMUM IN
STYLE DESIGNATORPLAIN FLANGED
MATERIAL DOCUMENT AND CLASSIFICATION66,AISI 416/SAE 51416 FED STD ALL MATERIAL RESPONSES BODY
BODY INSIDE DIAMETER0.717 INCHES MINIMUM AND 0.719 INCHES MAXIMUM IN
SEAT RADIUS0.188 INCHES NOMINAL IN
UNDER FLANGE HEIGHT1.562 INCHES NOMINAL IN
MATERIALSTEEL BODY
MATERIALCHROMIUM ALLOY FACE
SUBSTITUTES & CROSS-REFERENCES 1
105959-001Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
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 105959?
105959 is a SEAT,VALVE.
What parts can replace 105959?
There is 1 known substitute for 105959: 105959-001. Substitute compatibility should be verified for your specific system.
What is the NSN for 105959?
105959 is cataloged in the U.S. Government catalog under NSN 4820-00-104-6234. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.