PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

149 1/2INValve,gate

Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc · NSN 4820-01-418-6571 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-418-6571 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-418-6571. Primary manufacturer part number: 149 1/2IN.
Features
  • Valve,gate — FSC 4820
  • Bonnet Attachment Method: UNION
  • Material: COPPER ALLOY 836 BODY
  • Bonnet Type: INSIDE SCREW
  • Valve Operation Method: MANUAL
  • Material: COPPER ALLOY 836 DISK
  • Material: COPPER ALLOY 836 STEM
  • Valve Size: 0.250 INCHES IN
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
  • Applications requiring Copper Alloy 836 Body construction
General Description

The Valve,gate, cataloged under National Stock Number 4820-01-418-6571, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4820-01-418-6571
Primary Part Number149 1/2IN
Item NameValve,gate
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerMilwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc
StatusACTIVE
Bonnet Attachment MethodUNION
MaterialCOPPER ALLOY 836 BODY
Bonnet TypeINSIDE SCREW
Valve Operation MethodMANUAL
MaterialCOPPER ALLOY 836 DISK
MaterialCOPPER ALLOY 836 STEM
Valve Size0.250 INCHES IN
Connection TypeSOLDER, TUBE
Nominal Outside Diameter Tube Accommodated0.250 INCHES IN
Operating Pressure and Type125.0 POUNDS PER SQUARE INCH (PSI) STEAM MAXIMUM REQUIRED AND 200.0 POUNDS PER SQUARE INCH (PSI) WATER AND OTHER LIQUIDS MAXIMUM REQUIRED LOCATION NOT OTHERWISE SPECIFIED LBS
Features ProvidedBONNET PACKING
MaterialCOPPER ALLOY 836 SEAT
Inlet Relationship with OutletIDENTICAL
Stem TypeRISING
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 5
4820-00-068-1610A22612 INTERCHANGEABLE
Valve,safety Relief
Superior Air Products Co
6240-00-145-1148515846-3 INTERCHANGEABLE
Lamp,incandescent
Naval Air Warfare Center Aircraft Division Joint Base Jbmdl
6685-00-374-7351 INTERCHANGEABLE
Gage,pressure,dial Indicating
4940-01-102-0455 INTERCHANGEABLE
Leak Detector,refrigerant Gas
5315-01-160-1845 INTERCHANGEABLE
Pin
Cross-Reference Index
Part NumberManufacturer
149/.50 Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
149-1/2IN Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
149 1/2IN PRIMARY Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
149-.50IN Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc (USA)
Related Parts
4820-00-068-1610INTERCHANGEABLE
VALVE,SAFETY RELIEF
A22612
6240-00-145-1148INTERCHANGEABLE
LAMP,INCANDESCENT
515846-3
6685-00-374-7351INTERCHANGEABLE
GAGE,PRESSURE,DIAL INDICATING
4940-01-102-0455INTERCHANGEABLE
LEAK DETECTOR,REFRIGERANT GAS
5315-01-160-1845INTERCHANGEABLE
PIN

Frequently Asked Questions

What is NSN 4820-01-418-6571?

NSN 4820-01-418-6571 is a Valve,gate, manufactured by Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-418-6571?

NSN 4820-01-418-6571 has 4 cross-referenced part numbers: 149/.50 (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 149-1/2IN (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 149 1/2IN (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc), 149-.50IN (Milwaukee Valve Co, Inc Div Milwaukee Valve Company, Llc).

What NSN replaces 4820-01-418-6571?

There are 5 known substitutes for 4820-01-418-6571: 4820-00-068-1610, 6240-00-145-1148, 6685-00-374-7351 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 149 1/2IN?

Key specifications for 149 1/2IN: Bonnet Attachment Method: UNION; Material: COPPER ALLOY 836 BODY; Bonnet Type: INSIDE SCREW; Valve Operation Method: MANUAL. 14 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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