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    0.260" Bore Dia Threaded Heavy Duty Lagging Thermowells

    Threaded thermowells have a bore diameter of 0.260" with a tapered shank & lagging extension. Ideal for 1/4" Dia elements. Click here to shop more.
    $77.52
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    Data Sheet (PDF)

    0.260" Bore Dia Threaded Heavy Duty Lagging Thermowells
    Application:
    Standard length, 1/4' bimetal thermometers. #20 gage thermocouple elements. Unarmored liquid-in-glass test thermometers. Other temperature-sensing elements having .252 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 260HL—Lagging Extension Type
    All dimensions in inches.

    * NPSM internal pipe thread will accept both NPT and NPS male threads.

    Ext. Th'd P Model No. Lag. Ext.
    T    		 Elem. Lgth.
    A    		 Insert. Lgth.
    U    		 Shank Dia.
    Q
    3/4' NPT 3/4-260HL-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    		 7/8
    7/8
    7/8
    7/8
    7/8
    7/8
    1' NPT 1-260HL-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 1/16
    1 1/16
    1 1/16
    1 1/16
    1 1/16
    1 1/16


    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' - 260H
    and
    3/4' - 260HL    		 Brass 305 (97.5) 93.8 (54.1) 33.9 17.1 10.5 7 5 3.7
    Carbon Steel 386 (175) 180 (97.2) 65.3 (58.3) 33 20.1 13.4 9.6 7.1
    A.I.S.I. 304 & 316 440 (243) 197 (135) 71.2 36 22 14.7 0.5 7.8
    Monel 354 (195) 155 (108) 56.1 28.4 17.3 11.6 7.5 5.6
    1' - 260H
    and
    1' - 260HL    		 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 20.1 13.5 8.7 6.5
    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.