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845-2445066 ITEM 31 — Technical Data Sheet

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— · 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. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System under NSN 4820-01-159-7777, 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
845-2445066 ITEM 31
NSN: 4820-01-159-7777
FSC: 4820
CAGE: 80064 — NAVAL SHIP SYSTEMS COMMAND (USA)
SPECIFICATIONS
general_characteristics_item_descriptionNICKEL COPPER ALLOY,QQ-N-281;SIZE 3.000 IN.;OD 2.778 IN. NOMINAL;HEIGHT 3.250 IN. NOMINAL;ONE HOLE 0.172 IN. DIA,AND 0.531 IN. DEEP,0.812 IN. FROM CENTER IN
NSN4820-01-159-7777
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 845-2445066 ITEM 31 · 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
•
GENERAL CHARACTERISTICS ITEM DESCRIPTION: NICKEL COPPER ALLOY,QQ-N-281;SIZE 3.000 IN.;OD 2.778 IN. NOMINAL;HEIGHT 3.250 IN. NOMINAL;ONE HOLE 0.172 IN. DIA,AND 0.531 IN. DEEP,0.812 IN. FROM CENTER IN
TECHNICAL CHARACTERISTICS
GENERAL CHARACTERISTICS ITEM DESCRIPTIONNICKEL COPPER ALLOY,QQ-N-281;SIZE 3.000 IN.;OD 2.778 IN. NOMINAL;HEIGHT 3.250 IN. NOMINAL;ONE HOLE 0.172 IN. DIA,AND 0.531 IN. DEEP,0.812 IN. FROM CENTER IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
2620-920X12ASSY11APC4InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
845-2181282-3INInterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
845-2445066 ITEM 19InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
26M77-100-PC21InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
845-2445066InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
26M77-100 ITEM 21InterchangeableGOVERNMENT REGISTRY
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVEGOVERNMENT REGISTRY
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 845-2445066 ITEM 31?
845-2445066 ITEM 31 is a DISK RETAINER AND THROTTLING SKI.
What parts can replace 845-2445066 ITEM 31?
There are 21 known substitutes for 845-2445066 ITEM 31: 2620-920X12ASSY11APC4, 845-2181282-3IN, 845-2445066 ITEM 19 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 845-2445066 ITEM 31?
845-2445066 ITEM 31 is cataloged in the Federal Logistics Information System under NSN 4820-01-159-7777. 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: September 2026