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Technical Data Sheet
PartsTable / COMPONENT / 1251 1/2
1251 1/2 ✓ 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

The 1251 1/2 is a the manufacturer industrial component. This product is currently in active production with full OEM support. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-813-3359, 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
1251 1/2
NSN: 4820-00-813-3359
FSC: 4820
CAGE: 14959 — CRANE CO DIV VALVE DIV (USA)
SPECIFICATIONS
Part Number1251 1/2
NSN4820-00-813-3359
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 1251 1/2 · 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
•
MAXIMUM OPERATING TEMP: 335.0 FAHRENHEIT FIRST RESPONSE DEGF
•
MEDIA FOR WHICH DESIGNED: OIL SECOND RESPONSE
•
MATERIAL: COPPER ALLOY STEM
•
OPERATING PRESSURE: 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
TECHNICAL CHARACTERISTICS (FLIS)
MAXIMUM OPERATING TEMP335.0 FAHRENHEIT FIRST RESPONSE DEGF
MEDIA FOR WHICH DESIGNEDOIL SECOND RESPONSE
MATERIALCOPPER ALLOY STEM
MEDIA FOR WHICH DESIGNEDGAS, NATURAL THIRD RESPONSE
OPERATING PRESSURE150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FIRST RESPONSE LBS
OPERATING PRESSURE150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM THIRD RESPONSE LBS
OPERATING PRESSURE150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM FOURTH RESPONSE LBS
MATERIALCOPPER ALLOY SEAT
NOMINAL THREAD SIZE0.500 INCHES FIRST END IN
MAXIMUM OPERATING TEMP335.0 FAHRENHEIT THIRD RESPONSE DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
125112Interchangeable
interchangeable cross-reference
interchangeable
11646P11Interchangeable
interchangeable cross-reference
interchangeable
5001251-20Interchangeable
interchangeable cross-reference
interchangeable
33-15Interchangeable
interchangeable cross-reference
interchangeable
125948Interchangeable
interchangeable cross-reference
interchangeable
125112-001Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 1251 1/2?
1251 1/2 is a 1251 1/2.
What parts can replace 1251 1/2?
There are 9 known substitutes for 1251 1/2: 125112, 11646P11, 5001251-20 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 1251 1/2?
1251 1/2 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-813-3359. 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