0.385" Bore Dia Threaded Lagging Extension Thermowells
Standard Threaded Thermowell for 3/8 Inch Diameter Elements
Volume discounts available
Volume Discount Schedule
| Quantity | Price each |
|---|---|
| 1-9 | $308.61 |
| 10-24 | $293.18 |
| 25-49 | $287.01 |
| 50-99 | $274.66 |
| 100-199 | $268.49 |
| 200+ | $262.32 |
Added to Your Shopping Cart
Configuration complete.
Please add to cart to keep it or exit the configuration
Please add to cart to keep it or exit the configuration
Failed to Save Configurations, Click on Configure Button Start Again
- Available in Carbon Steel and Stainless Steel
- Standard Insertion Lengths from 2 1/2 to 19 1/2 Inches
- 3/4 Inch and 1 Inch External Diameter
1-385L-U191/2-304SS Model Options
View all modelsEdit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.
*Highlighted options are not compatible. Please select a different combination.
External Thread
Material
Insertion Length
Pressure Rating
Features
Stem length/Probe Length
Pipe Size
Flange Size
Shank Diameter
Shank Style
Internal Thread
Bore Diameter
Well Type
Application:
Standard length, 3/8' stem, bimetal thermometers. #14 gage thermocouple elements. Armored liquid-in-glass test thermometers. Other temperature-sensing elements having .377 in. maximum diameter.
Connection Size:
3/4' NPT and 1' NPT are standard. Other thread sizes are available upon request.
Materials:
Brass (ASTM B-16); Carbon Steel (C-1018); Stainless Steel A.I.S.I. 304 & A.I.S.I. 316; Monel. Wells are also available in special materials; prices on request.
Series 385L—Lagging Extension Type
All dimensions in inches.
![]()
* NPSM internal pipe thread will accept both NPT and NPS male threads.
Maximum Fluid Velocity—feet per second
Standard length, 3/8' stem, bimetal thermometers. #14 gage thermocouple elements. Armored liquid-in-glass test thermometers. Other temperature-sensing elements having .377 in. maximum diameter.
Connection Size:
3/4' NPT and 1' NPT are standard. Other thread sizes are available upon request.
Materials:
Brass (ASTM B-16); Carbon Steel (C-1018); Stainless Steel A.I.S.I. 304 & A.I.S.I. 316; Monel. Wells are also available in special materials; prices on request.
Series 385L—Lagging Extension Type
All dimensions in inches.
* NPSM internal pipe thread will accept both NPT and NPS male threads.
| External Thread P | Model No. | Lag. Ext. T | Elem. Lgth. A | Insert. Lgth. U |
| 3/4' NPT | 3/4-385L-U 2 1/2 -U 4 1/2 -U 7 1/2 -U10 1/2 -U13 1/2 -U19 1/2 | 2 3 3 3 3 3 | 6 9 12 15 18 24 | 2 1/2 4 1/2 7 1/2 10 1/2 13 1/2 19 1/2 |
| 1' NPT | 1-385L-U 2 1/2 -U 4 1/2 -U 7 1/2 -U10 1/2 -U13 1/2 -U19 1/2 | 2 3 3 3 3 3 | 6 9 12 15 18 24 | 2 1/2 4 1/2 7 1/2 10 1/2 13 1/2 19 1/2 |
Maximum Fluid Velocity—feet per second
| Well Type | Material | Insertion Length – “U” | |||||||
| 2 1/2 | 4 1/2 | 7 1/2 | 10 1/2 | 13 1/2 | 16 1/2 | 19 1/2 | 22 1/2 | ||
| 3/4' - 385S and 3/4' - 385L | Brass | 290 (145) | 150 (80) | 54.1 (48) | 27.6 | 16.7 | 11.1 | 8 | 6 |
| Carbon Steel | 326 (260) | 192 (144) | 69.5 | 35.4 | 20.5 | 14.3 | 10.3 | 7.7 | |
| A.I.S.I. 304 & 316 | 349 (360) | 199 | 71.9 | 36.6 | 21.2 | 14.8 | 10.7 | 8 | |
| Monel | 316 (320) | 189 (178) | 68.1 | 34.8 | 20.8 | 14 | 10 | 7.5 | |
| Where single values appear in the velocity tables, these may be considered safe for water, steam, air or gas. In the shorter insertion lengths, consideration is given to the velocity pressure effect of water flowing at higher velocities. The values in parentheses, therefore, represent safe values for water flow, while the unbracketed values may be used for steam, air, gas and similar density fluids. See 385S Thermowell Page for Pressure-Temperature Ratings |
