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 Series 20&25 Tapered Shank with .260" Bore 
for 1/4" Diameter Elements
Heavy Duty Threaded

Series 20 Tapered Shank | Series 25 Tapered Shank-Lagging Extension Type 

Series 20 Tapered Shank
Heavy Duty Threaded

 

How To Order
Complete the Part Number by filling above the line
( __ ) with the number designating the material.
    1 = Steel
    2 = Brass
    3 = 316 Stainless Steel
    4 = 304 Stainless Steel
    5 = Monel

Please contact Tempco for further assistance.
Toll Free (888) 268-6396

Series 20 Standard Sizes

Part Number External
Thread
"P"		 Element
Length
"A" (in)		 Insertion
Length
"U" (in)		 Shank
Diameter
"B" (in)		 Price
US Dollars
TWL2021__ 3/4"
NPT		 4 2-1/2 --  
TWL2022__ 6 4-1/2 7/8  
TWL2023__ 9 7-1/2 7/8  
TWL2024__ 12 10-1/2 7/8  
TWL2025__ 15 13-1/2 7/8  
TWL2026__ 18 16-1/2 7/8  
TWL2028__ 24 22-1/2 7/8  
TWL2031__ 1"
NPT		 4 2-1/2 --  
TWL2032__ 6 4-1/2 11/16  
TWL2033__ 9 7-1/2 11/16  
TWL2034__ 12 10-1/2 11/16  
TWL2035__ 15 13-1/2 11/16  
TWL2036__ 18 16-1/2 11/16  
TWL2038__ 24 22-1/2 11/16  

 

Series 25 Tapered Shank-Lagging Extension Type 
Heavy Duty Threaded

  

How To Order
Complete the Part Number by filling above the line
( __ ) with the number designating the material.
    1 = Steel
    2 = Brass
    3 = 316 Stainless Steel
    4 = 304 Stainless Steel
    5 = Monel

Please contact Tempco for further assistance.
Toll Free (888) 268-6396

Series 25 Standard Sizes

Part Number External
Thread
"P"		 Lag
Extension
"T" (in)		 Stem
Length
"A" (in)		 Insert
Length
"U" (in)		 Shank
Diameter
"B" (in)		 Price
US Dollars
TWL2521__ 3/4"
NPT		 2 6 2-1/2 --  
TWL2522__ 3 9 4-1/2 7/8  
TWL2523__ 3 12 7-1/2 7/8  
TWL2524__ 3 15 10-1/2 7/8  
TWL2525__ 3 18 13-1/2 7/8  
TWL2527__ 3 24 19-1/2 7/8  
TWL2531__ 1"
NPT		 2 6 2-1/2 --  
TWL2532__ 3 9 4-1/2 11/16  
TWL2533__ 3 12 7-1/2 11/16  
TWL2534__ 3 15 10-1/2 11/16  
TWL2535__ 3 18 13-1/2 11/16  
TWL2537__ 3 24 19-1/2 11/16  

 

Maximum Fluid Velocity Feet per Second
(See Velocity Ratings)

 Well Type

 Material

Insertion Length -- "U" (in)

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"
Series
20 and 25

Brass

305 (97.5)

93.8 (54.1)

33.9

17.1

10.5

7.0

5.0

3.7

Carbon Steel

386 (175)

180 (97.2)

65.3 (58.3)

33.0

20.1

13.4

9.6

7.1

A.I.S.I. 304 &316

440 (243)

197 (135)

71.2

36.0

22.0

14.7

10.5

7.8

Monel

354 (195)

155 (108)

56.1

28.4

17.3

11.6

7.5

5.6

1"
Series
20 and 25

Brass

354 (161)

108 (89.5)

39.4

19.8

12.2

8.1

5.8

4.3

Carbon Steel

448 (289)

209 (161)

75.7

38.4

23.3

15.5

11.1

8.2

A.I.S.I. 304 &316

490 (403)

228 (225)

82.5

41.8

25.5

17.1

12.2

9.1

Monel

410 (322)

179 (178)

65.1

33.0

20.1

13.5

8.7

6.5
Where single values appear in table, thermowell may be considered safe for water, steam, air or gas. The values in parenthesis in the shorter insertion lengths represent safe values for water flow, taking into consideration the velocity pressure effect of water flowing at higher velocities.

 

Pressure -- Temperature Rating
(lbs per square inch)

Material

Temperature

70ºF

200ºF

400ºF

600ºF

800ºF

1000ºF

1200ºF

Brass

5300

4750

1100

--

--

--

--

Carbon Steel

5950

5750

5450

5250

4000

1750

--

A.I.S.I. 304

7800

7050

6400

6150

6000

5190

1875

A.I.S.I. 316

7800

7800

7250

7100

6950

5800

2720

Monel

7450

6850

6150

6100

5940

1750

--