We recommend the use of a thermowell in conjunction with a bimetallic thermometer when the application involves a corrosive medium, high pressure, or high flow velocity. Perfect for applications requiring protection for unarmored liquid-in-glass test thermometers, or other temperature sensing elements with a maximum diameter of .25”.

These #20 gauge bimetallic thermowells meet or exceed SAMA specifications and are also available with heavy-duty, flange, socket weld, and Van Stone models. Standard thermowells are made of 316L SST and are stepped to 1/2” OD, except for 2½” insertion. Straight shank models are also available.

The standard process connection sizes are 1/2″-14 NPT, 3/4″-14 NPT, and 1″-11 1/2 NPT, with other sizes available. Materials of construction include 316L stainless steel (standard), 304 stainless steel, and brass (ASTM B-16). A cap and chain for keeping the thermowell bore clean when not in use are available upon request.

LENGTHS: ±1/16′ on lengths 12″ or less; ±1/8″ on lengths 12″ or over
WELLS 30″ AND OVER: Solid bored type will be drilled thru end, plugged, and heli-arc welded; built-up design must be speci-fied beyond 42-1/4″ overall length 0D TOLERANCES: Fractional: ±.015; Décimal: ±.005 on .000 place; ±.01 on .00 place
BORE ID: +.005; -.003; usually within ±.002
END THICKNESS: Gun drill bottom; 1/4″ to bottom ±1/16″; 3/16″
minimum end thickness
CONCENTRICITY OF BORE TO OD: ±10% of minimum wall thickness
WETTED SURFACES FINISH: Standard finish 60-100 Ra; 16-32 Ra available; 4-10 Ra mirror polish available RADIUS UNDER THREADS AND FLANGES: 1/8″ is standard, ±1/16″.; 1/16″ on Van Stone type
MALE THREADS (NPT): ±1 tum on thread gage

Mounting : weld, threaded
Material : brass, stainless steel
Other characteristics : for temperature sensors