Weld thermowell TW
threadedbrassstainless steel

weld thermowell
weld thermowell
weld thermowell
weld thermowell
weld thermowell
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weld, threaded
brass, stainless steel
Other characteristics
for temperature sensors


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


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.