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I-1-2-8 — VALVE,LINEAR,DIRECTIONAL CONTROL

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

I-1-2-8: VALVE,LINEAR,DIRECTIONAL CONTROL.

VALVE,LINEAR,DIRECTIONAL CONTROL. Key specifications include height: 0.125 INCHES NOMINAL IN, length: 0.188 INCHES NOMINAL SQUARE END IN, diameter: 0.500 INCHES NOMINAL IN, material: STEEL COMP 304, thickness: 0.031 INCHES NOMINAL IN, head_style: FLAT. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-324-0913, 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
I-1-2-8
NSN: 4820-00-324-0913
NIINs: 003240913, 016139369
FSC: 4820 — Valves, Nonpowered
CAGE: 79606 — GOULD INC CLEVITE ENGINE PARTS DIV (USA)
SPECIFICATIONS
height0.125 INCHES NOMINAL IN
length0.188 INCHES NOMINAL SQUARE END IN
diameter0.500 INCHES NOMINAL IN
materialSTEEL COMP 304
thickness0.031 INCHES NOMINAL IN
head_styleFLAT
constructionSEAMLESS
hole_diameter0.339 INCHES MINIMUM AND 0.359 INCHES MAXIMUM IN
thread_length0.630 INCHES MINIMUM IN
chamfer_length0.625 INCHES NOMINAL IN
flute_quantity3
overall_length1.780 INCHES MAXIMUM IN
NSN4820-00-324-0913
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: I-1-2-8 · 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 7
VI449Reference document
Same NSN cross-reference
Reference document — Secondary reference
V977NReference document
Same NSN cross-reference
Reference document — Secondary reference
890Reference document
Same NSN cross-reference
Reference document — Secondary reference
U3166Reference document
Same NSN cross-reference
Reference document — Secondary reference
15-157Reference document
Same NSN cross-reference
Reference document — Secondary reference
V1018Reference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Semi-active item — no replacement plannedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is I-1-2-8?
I-1-2-8 is a VALVE,LINEAR,DIRECTIONAL CONTROL.
What parts can replace I-1-2-8?
There are 7 known substitutes for I-1-2-8: VI449, V977N, 890 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for I-1-2-8?
I-1-2-8 is cataloged in the U.S. Government catalog under NSN 4820-00-324-0913. 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.