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550120 — SHAFT,SHOULDERED

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

550120: SHAFT,SHOULDERED.

The SHAFT,SHOULDERED is a the manufacturer industrial component. Key specifications include material: STEEL COMP 8640 OR STEEL COMP 8740 OR STEEL COMP 4140, end_similarity: IDENTICAL, overall_length: 11.173 INCHES MINIMUM AND 11.183 INCHES MAXIMUM IN, first_end_style: SPLINED (INVOLUTE), first_end_diameter: 1.3800 INCHES NOMINAL IN, largest_step_diameter: 1.6865 INCHES MINIMUM AND 1.6890 INCHES MAXIMUM IN. This part is cataloged in the U.S.

Government catalog under NSN 4810-00-078-2763, 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
550120
NSN: 4810-00-078-2763
NIINs: 000782763, 006996284
FSC: 4810 — Valves, Powered
CAGE: 53730 — WESTFIELD HYDRAULICS INC DBA WESTFIELD HYDRAULICS INC (USA)
SPECIFICATIONS
materialSTEEL COMP 8640 OR STEEL COMP 8740 OR STEEL COMP 4140
step_quantity2
end_similarityIDENTICAL
overall_length11.173 INCHES MINIMUM AND 11.183 INCHES MAXIMUM IN
first_end_styleSPLINED (INVOLUTE)
first_end_diameter1.3800 INCHES NOMINAL IN
largest_step_diameter1.6865 INCHES MINIMUM AND 1.6890 INCHES MAXIMUM IN
first_end_spline_length0.5600 INCHES NOMINAL IN
first_end_pitch_diameter1.6500 INCHES NOMINAL IN
first_end_pressure_angle30.0 DEGREES NOMINAL
first_end_spline_quantity33
first_end_spline_major_diameter1.6865 INCHES MINIMUM AND 1.6890 INCHES MAXIMUM IN
NSN4810-00-078-2763
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 550120 · 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
SUBSTITUTES & CROSS-REFERENCES 1
37899-100Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 550120?
550120 is a SHAFT,SHOULDERED.
What parts can replace 550120?
There is 1 known substitute for 550120: 37899-100. Substitute compatibility should be verified for your specific system.
What is the NSN for 550120?
550120 is cataloged in the U.S. Government catalog under NSN 4810-00-078-2763. 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.