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Technical Data Sheet
PartsTable / COMPONENT / 81551-01 3/8IN
81551-01 3/8IN ✓ 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 81551-01 3/8IN is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4820-00-181-9444, 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
81551-01 3/8IN
NSN: 4820-00-181-9444
FSC: 4820
CAGE: 76364 — MILWAUKEE VALVE CO, INC DIV MILWAUKEE VALVE COMPANY, LLC (USA)
SPECIFICATIONS
Part Number81551-01 3/8IN
NSN4820-00-181-9444
COMPONENT DIAGRAM
GATE VALVE — FULL OPEN OR FULL CLOSE ONLY Rising STEM BONNET FLOW → → FLOW SEATS — — SIZE: — · — · — PN: 81551-01 3/8IN · 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
•
FEATURES PROVIDED: BONNET PACKING
•
NOMINAL PIPE SIZE ACCOMMODATED: 0.375 INCHES ALL ENDS IN
•
MATERIAL: STEEL COMP 410 STEM
•
MATERIAL DOCUMENT AND CLASSIFICATION: MIL-R-17131,MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
•
CONNECTION TYPE: UNTHREADED INTERNAL PIPE ALL ENDS
•
CONNECTION STYLE: SOCKET ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
FEATURES PROVIDEDBONNET PACKING
NOMINAL PIPE SIZE ACCOMMODATED0.375 INCHES ALL ENDS IN
MATERIALSTEEL COMP 410 STEM
MATERIALSTEEL FLOW CONTROL DEVICE
MATERIAL DOCUMENT AND CLASSIFICATIONMIL-R-17131,MIL-RCOCR-A MIL SPEC SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE
CONNECTION TYPEUNTHREADED INTERNAL PIPE ALL ENDS
CONNECTION STYLESOCKET ALL ENDS
MATERIAL DOCUMENT AND CLASSIFICATION66 FED STD SINGLE MATERIAL RESPONSE STEM
MATERIALSTEEL SEAT
MAXIMUM OPERATING TEMP775.0 FAHRENHEIT SINGLE RESPONSE DEGF
VERIFIED SUBSTITUTES & CROSS-REFERENCES 25
01 426Interchangeable
interchangeable cross-reference
interchangeable
84389 01426Interchangeable
interchangeable cross-reference
interchangeable
01 426 H7Interchangeable
interchangeable cross-reference
interchangeable
MW024CSX000020UNCInterchangeable
interchangeable cross-reference
interchangeable
5054809-1Interchangeable
interchangeable cross-reference
interchangeable
J-W-1177/11-01C020Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 81551-01 3/8IN?
81551-01 3/8IN is a 81551-01 3/8IN.
What parts can replace 81551-01 3/8IN?
There are 25 known substitutes for 81551-01 3/8IN: 01 426, 84389 01426, 01 426 H7 and 22 more. Substitute compatibility should be verified for your specific system.
Is 81551-01 3/8IN still available?
81551-01 3/8IN is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026