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Technical Data Sheet
PartsTable / COMPONENT / 9000-2129 PIECE 3
9000-2129 PIECE 3 ✓ Verified by PartsTable
— · GATE VALVE
WHAT YOU NEED TO KNOW
Full open or full close only — never throttle Rising stem shows position visually
Throttling a gate valve erodes seats
PRODUCT OVERVIEW

DISK RETAINER AND THROTTLING SKI. Key specifications include material: NICKEL ALLOY B OVERALL, thread_length: 0.656 INCHES NOMINAL SINGLE THREADED PORTION IN, flange_diameter: 3.875 INCHES NOMINAL IN, special_features: 4 SLOTS 0.750 IN. WIDE EQUALLY SPACED IN, style_designator: THREADED FLANGED, nominal_thread_size: 3.459 INCHES SINGLE THREADED PORTION IN.

This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-215-3248, 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
9000-2129 PIECE 3
NSN: 4820-01-215-3248
FSC: 4820
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialNICKEL ALLOY B OVERALL
thread_length0.656 INCHES NOMINAL SINGLE THREADED PORTION IN
flange_diameter3.875 INCHES NOMINAL IN
special_features4 SLOTS 0.750 IN. WIDE EQUALLY SPACED IN
style_designatorTHREADED FLANGED
nominal_thread_size3.459 INCHES SINGLE THREADED PORTION IN
under_flange_height0.812 INCHES NOMINAL IN
body_inside_diameter2.625 INCHES MINIMUM AND 2.630 INCHES MAXIMUM IN
seating_surface_shapeFLAT
thread_quantity_per_inch11-1/2 SINGLE THREADED PORTION
thread_series_designatorUNS SINGLE THREADED PORTION
flange_seat_to_disk_end_height0.688 INCHES NOMINAL IN
NSN4820-01-215-3248
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 9000-2129 PIECE 3 · 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: 0.688 INCHES NOMINAL IN
•
MATERIAL: NICKEL ALLOY B OVERALL
•
STYLE DESIGNATOR: THREADED FLANGED
•
MATERIAL DOCUMENT AND CLASSIFICATION: ASTM B164 ALLOY R-405 ASSN STD SINGLE MATERIAL RESPONSE SEAT
•
THREAD SERIES DESIGNATOR: UNS SINGLE THREADED PORTION
•
UNDER FLANGE HEIGHT: 0.812 INCHES NOMINAL IN
•
THREAD LENGTH: 0.656 INCHES NOMINAL SINGLE THREADED PORTION IN
TECHNICAL CHARACTERISTICS (FLIS)
FLANGE SEAT TO DISK END HEIGHT0.688 INCHES NOMINAL IN
SPECIAL FEATURES4 SLOTS 0.750 IN. WIDE EQUALLY SPACED IN
MATERIALNICKEL ALLOY B OVERALL
STYLE DESIGNATORTHREADED FLANGED
MATERIAL DOCUMENT AND CLASSIFICATIONASTM B164 ALLOY R-405 ASSN STD SINGLE MATERIAL RESPONSE SEAT
THREAD SERIES DESIGNATORUNS SINGLE THREADED PORTION
UNDER FLANGE HEIGHT0.812 INCHES NOMINAL IN
THREAD LENGTH0.656 INCHES NOMINAL SINGLE THREADED PORTION IN
NOMINAL THREAD SIZE3.459 INCHES SINGLE THREADED PORTION IN
SEATING SURFACE SHAPEFLAT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 13
2620-920X12ASSY11APC4Interchangeable
interchangeable cross-reference
interchangeable
845-2181282-3INInterchangeable
interchangeable cross-reference
interchangeable
845-2445066 ITEM 19Interchangeable
interchangeable cross-reference
interchangeable
30147 PIECE 10Interchangeable
interchangeable cross-reference
interchangeable
9000-2129Interchangeable
interchangeable cross-reference
interchangeable
9000-2129 PIECE 10Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 9000-2129 PIECE 3?
9000-2129 PIECE 3 is a DISK RETAINER AND THROTTLING SKI.
What parts can replace 9000-2129 PIECE 3?
There are 13 known substitutes for 9000-2129 PIECE 3: 2620-920X12ASSY11APC4, 845-2181282-3IN, 845-2445066 ITEM 19 and 10 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 9000-2129 PIECE 3?
9000-2129 PIECE 3 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-01-215-3248. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026