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255721 PIECE 27 — STARTER,ENGINE,ELECTRICAL

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

255721 PIECE 27: STARTER,ENGINE,ELECTRICAL.

The STARTER,ENGINE,ELECTRICAL is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 630, overall_length: 4.500 INCHES NOMINAL IN, stem_actuating_end_type: THREADED EXTERNALLY, largest_outside_diameter: 0.875 INCHES NOMINAL IN, valve_size_for_which_designed: 1.250 INCHES IN, valve_type_for_which_designed: BALL. This part is cataloged in the U.S.

Government catalog under NSN 4820-01-318-9741, 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
255721 PIECE 27
NSN: 4820-01-318-9741
FSC: 4820 — Valves, Nonpowered
CAGE: 43689 — HUNTINGTON INGALLS INC DIV NEWPORT NEWS SHIPBUILDING (USA)
SPECIFICATIONS
materialCOPPER ALLOY 630
overall_length4.500 INCHES NOMINAL IN
stem_actuating_end_typeTHREADED EXTERNALLY
largest_outside_diameter0.875 INCHES NOMINAL IN
valve_size_for_which_designed1.250 INCHES IN
valve_type_for_which_designedBALL
NSN4820-01-318-9741
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 255721 PIECE 27 · 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
•
VALVE TYPE FOR WHICH DESIGNED: BALL
•
LARGEST OUTSIDE DIAMETER: 0.875 INCHES NOMINAL IN
•
STEM ACTUATING END TYPE: THREADED EXTERNALLY
•
VALVE SIZE FOR WHICH DESIGNED: 1.250 INCHES IN
•
MATERIAL: COPPER ALLOY 630
TECHNICAL CHARACTERISTICS
VALVE TYPE FOR WHICH DESIGNEDBALL
LARGEST OUTSIDE DIAMETER0.875 INCHES NOMINAL IN
STEM ACTUATING END TYPETHREADED EXTERNALLY
OVERALL LENGTH4.500 INCHES NOMINAL IN
VALVE SIZE FOR WHICH DESIGNED1.250 INCHES IN
MATERIALCOPPER ALLOY 630
SUBSTITUTES & CROSS-REFERENCES 1
255721Reference document
Same NSN cross-reference
Reference document — Drawing number reference only
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 255721 PIECE 27?
255721 PIECE 27 is a STARTER,ENGINE,ELECTRICAL.
What parts can replace 255721 PIECE 27?
There is 1 known substitute for 255721 PIECE 27: 255721. Substitute compatibility should be verified for your specific system.
What is the NSN for 255721 PIECE 27?
255721 PIECE 27 is cataloged in the U.S. Government catalog under NSN 4820-01-318-9741. 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.