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SP-12-8B — SEAT,VALVE

✓ Government record, cited
— · GATE VALVE
PRODUCT OVERVIEW

SP-12-8B: SEAT,VALVE.

The SEAT,VALVE is a the manufacturer industrial component. Key specifications include criticality_code_justification: ZZZY. This part is cataloged in the U.S.

Government catalog under NSN 4820-00-126-8544, 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
SP-12-8B
NSN: 4820-00-126-8544
NIINs: 001268544, 011422063, 014114806
FSC: 4820 — Valves, Nonpowered
CAGE: 92021 — IMI CRITICAL ENGR PBM LLC (USA)
SPECIFICATIONS
criticality_code_justificationZZZY
reference_number_differentiating_characteristicsMATERIAL WILL BE IN ACCORDANCE WITH SHIPS PARTS CONTROL CENTER ACTIVITY HX QUALITY CONTROL, MANUFACTURING AND TESTING SPECIFICATIONS
NSN4820-00-126-8544
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: SP-12-8B · 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
•
BODY OUTSIDE DIAMETER: 1.050 INCHES NOMINAL IN
•
STYLE DESIGNATOR: PLAIN
•
BODY INSIDE DIAMETER: 0.620 INCHES NOMINAL IN
•
SEAT RADIUS: 0.187 INCHES NOMINAL IN
•
MATERIAL: PLASTIC POLYTETRAFLUOROETHYLENE SEAT
•
SEATING SURFACE SHAPE: RADIAL
TECHNICAL CHARACTERISTICS
OVERALL HEIGHT0.175 INCHES MINIMUM AND 0.185 INCHES MAXIMUM IN
BODY OUTSIDE DIAMETER1.050 INCHES NOMINAL IN
STYLE DESIGNATORPLAIN
BODY INSIDE DIAMETER0.620 INCHES NOMINAL IN
SEAT RADIUS0.187 INCHES NOMINAL IN
SPECIAL FEATURES1ST SEAT DEPTH 0.060 IN. 2ND SEAT DEPTH 0.125 IN. IN
MATERIALPLASTIC POLYTETRAFLUOROETHYLENE SEAT
SEATING SURFACE SHAPERADIAL
SUBSTITUTES & CROSS-REFERENCES 2
2EH751Same NSN cross-reference
Same NSN cross-reference
Also cataloged under this NSN
SPB-32-S2 ITH .Reference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Terminal item — no further procurement; issued until stock is exhaustedNo demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is SP-12-8B?
SP-12-8B is a SEAT,VALVE.
What parts can replace SP-12-8B?
There are 2 known substitutes for SP-12-8B: 2EH751, SPB-32-S2 ITH .. Substitute compatibility should be verified for your specific system.
What is the NSN for SP-12-8B?
SP-12-8B is cataloged in the U.S. Government catalog under NSN 4820-00-126-8544. 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.