1/2-260L-U41/2-316SS

Thermowell, 1/2" NPT, 316 Stainless Steel, 4.5", 260L Series

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.

Manufacturer: OMEGA
Product type:
SVHC: Lead (04-Feb-2026)

Delivery and price
Units per pack	1
Price	145.11 €
Current stock	10+
Lead time	30 days

Datasheet

## **Series 260L Standard Threaded Well for[1] ⁄4" Diameter Elements** 

**Application:** Standard length,[1] ⁄4" stem, bimetal thermometers; #20-gage thermocouple elements; unarmored liquid-in-glass test thermometers. Other temperaturesensing elements having 0.252" maximum diameter. 

## **Connection Size:** 

1 3 ⁄2, ⁄4 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. 

## **Cap and Chain Options:** 

For Brass cap, add suffix “ **-CC-Brass** ” to the end of the model number when ordering for additional cost. For 304 SS cap, add suffix “ **-CC** ” to the end of the model number for additional cost. 

## **Series 260L—Lagging Extension Type** 

|**To Order****_Visit omega.com/series_260l for Pricing and Details_**|**To Order****_Visit omega.com/series_260l for Pricing and Details_**|**To Order****_Visit omega.com/series_260l for Pricing and Details_**|**To Order****_Visit omega.com/series_260l for Pricing and Details_**|**To Order****_Visit omega.com/series_260l for Pricing and Details_**|**To Order****_Visit omega.com/series_260l for Pricing and Details_**|
|---|---|---|---|---|---|
|**Ext**<br>~~**Thread P**~~|~~**Model Numbe**~~**r**|**Stem**<br>**Length A**|**Insert**<br>**Length U**|**Lag**<br>**Ext T**|**Shank**<br>**Dia. Q**|
|~~**Thread P**~~||||||
|1⁄2NPT|**1/2-260L-U21/2-(*)**<br>**1/2-260L-U41/2-(*)**<br>**1/2-260L-U71/2-(*)**<br>**1/2-260L-U101/2-(*)**<br>**1/2-260L-U131/2-(*)**<br>**1/2-260L-U191/2-(*)**|6<br>9<br>12<br>15<br>18<br>24|21⁄2<br>41⁄2<br>71⁄2<br>101⁄2<br>131⁄2<br>191⁄2|2<br>3<br>3<br>3<br>3<br>3|—<br>5⁄8<br>5⁄8<br>5⁄8<br>5⁄8<br>5⁄8|
|3⁄4 NPT|**3/4-260L-U21/2-(*)**<br>**3/4-260L-U41/2-(*)**<br>**3/4-260L-U71/2-(*)**<br>**3/4-260L-U101/2-(*)**<br>**3/4-260L-U131/2-(*)**<br>**3/4-260L-U191/2-(*)**|6<br>9<br>12<br>15<br>18<br>24|21⁄2<br>41⁄2<br>71⁄2<br>101⁄2<br>131⁄2<br>191⁄2|2<br>3<br>3<br>3<br>3<br>3|—<br>3⁄4<br>3⁄4<br>3⁄4<br>3⁄4<br>3⁄4|
|1 NPT|**1-260L-U21/2-(*)**<br>**1-260L-U41/2-(*)**<br>**1-260L-U71/2-(*)**<br>**1-260L-U101/2-(*)**<br>**1-260L-U131/2-(*)**<br>**1-260L-U191/2-(*)**|6<br>9<br>12<br>15<br>18<br>24|21⁄2<br>41⁄2<br>71⁄2<br>101⁄2<br>131⁄2<br>191⁄2|2<br>3<br>3<br>3<br>3<br>3|—<br>7⁄8<br>7⁄8<br>7⁄8<br>7⁄8<br>7⁄8|



_***** Specify material type “_ _**304SS** ” for 304 stainless steel,_ _**“316SS”** for 316 stainless steel,_ _**“CS”** for carbon steel or_ 

_**“BRASS”** for brass. PFA coating available._ 

_**Ordering Example: 3/4-260L-U71/2-304SS** , 304 stainless steel thermowell with[3] ⁄4 NPT external thread,_ 

_0.260" internal Dia., 3" lagging extension, 7[1] ⁄2" insertion length and a 12" stem length._ 

**For Assistance in Choosing Head and Well Assemblies, visit omega.com/head_and_well** 

## **Maximum Fluid Velocity—Feet Per Second** 

|**Well Type           Material**<br>~~———S>S==S==S==~~|**e           Material**<br>~~———S>S==S==S==~~|**Insertion Length – “U”**|**Insertion Length – “U”**|**Insertion Length – “U”**|**Insertion Length – “U”**|**Insertion Length – “U”**|**Insertion Length – “U”**|**Insertion Length – “U”**|**Insertion Length – “U”**|
|---|---|---|---|---|---|---|---|---|---|
|||**21⁄2**<br>~~a~~<br>~~———S>S==S==S==~~|**41⁄2**<br>~~SS~~<br>~~———S>S==S==S==~~|**71⁄2**<br>~~SS~~<br>~~———S>S==S==S==~~|**101⁄2 **<br>~~———S>S==S==S==~~|**131⁄2 **|**161⁄2 **|**191⁄2 **|**221⁄2**|
|1⁄2"- 260S<br>and<br>1⁄2"- 260L<br>~~———S>S==S==S==~~<br>|Brass<br>Carbon steel<br>A.I.S.I. 304 and 316 300<br>Monel<br>~~a~~<br>~~—————~~<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br>~~ere~~|207(59.3)<br>~~—————~~<br>~~———S>S==S==S==~~|75.5(32.2)<br>~~—————~~<br>~~———S>S==S==S==~~|)27.3(19.7)13.9 8.4<br>~~—————~~<br>~~———S>S==S==S==~~|13.9 8.4<br>~~—————~~<br>~~———S>S==S==S==~~|13.9 8.4<br>~~—————~~|5.6<br>~~—————~~|4.1<br>~~—————~~|3.0<br>~~—————~~|
|||290(106)<br>~~—————~~<br>~~———S>S==S==S==~~<br>~~ee~~|105(59)<br>~~—————~~<br>~~———S>S==S==S==~~<br>~~ee~~|38.2(36.3)19.4 11.8 7.8<br>~~—————~~<br>~~———S>S==S==S==~~<br>~~ee~~|19.4 11.8 7.8<br>~~—————~~<br>~~———S>S==S==S==~~<br>~~ee~~|19.4 11.8 7.8<br>~~—————~~|19.4 11.8 7.8<br>~~—————~~<br>~~eee~~|5.7<br>~~—————~~<br>~~eee~~|4.2<br>~~—————~~<br>~~eee~~|
|||A.I.S.I. 304 and 316 300(148)<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~|109(82.2)<br>~~———S>S==S==S==~~<br>~~ee~~|)<br>39.5<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~|20.1 12.2 8.1<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~|20.1 12.2 8.1|20.1 12.2 8.1<br>~~eee~~<br>~~eee~~|5.9<br>~~eee~~<br>~~eee~~|4.4<br>~~eee~~<br>~~eee~~|
|||261(118)<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br>~~ere~~|95(65.5)<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~|34.4<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br>~~ee~~|17.5 10.5 7.1<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br>|17.5 10.5 7.1<br>~~ee~~|17.5 10.5 7.1<br>~~eee~~<br>~~eee~~<br>~~ee~~|5.2<br>~~eee~~<br>~~eee~~<br>~~ee~~|3.8<br>~~eee~~<br>~~eee~~<br>~~ee~~|
|3⁄4"- 260S<br>and<br>3⁄4"- 260L<br>~~———S>S==S==S==~~<br>~~0 ~~|Brass<br>Carbon steel<br>A.I.S.I. 304 and 316 300<br>Monel<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br> ~~ere~~<br>~~Se~~<br>~~Se~~<br>~~ee~~|207(59.3)<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br>~~|~~<br>~~ere~~|89.1(39.8)<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~|~~<br>~~ee~~|)32.2(23.9)16.4 9.9<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br>~~|~~<br>~~ee~~|16.4 9.9<br>~~———S>S==S==S==~~<br>~~ee~~<br>~~ee~~<br>~~|~~<br>|16.4 9.9<br>~~|~~<br>~~ee~~|6.6<br>~~eee~~<br>~~eee~~<br>~~|~~<br>~~ee~~|4.8<br>~~eee~~<br>~~eee~~<br>~~|~~<br>~~ee~~|3.6<br>~~eee~~<br>~~eee~~<br>~~|~~<br>~~ee~~|
|||290(106)<br>~~ee~~<br>~~|~~<br>~~ere~~|123(71.2)<br>~~|~~<br>~~ee~~|)<br>44.9(42.7)22.8 13.8 9.3<br>~~ee~~<br>~~|~~<br>~~ee~~|22.8 13.8 9.3<br>~~ee~~<br>~~|~~<br>|22.8 13.8 9.3<br>~~|~~<br>~~ee~~|22.8 13.8 9.3<br>~~eee~~<br>~~|~~<br>~~ee~~|6.7<br>~~eee~~<br>~~|~~<br>~~ee~~|4.9<br>~~eee~~<br>~~|~~<br>~~ee~~|
|||A.I.S.I. 304 and 316 300(148)<br>~~|~~<br>~~ere~~|128(99.3)<br>~~|~~<br>~~ee~~|)<br>46.4<br>~~|~~<br>~~ee~~|23.6 14.3 9.6<br>~~|~~<br>|23.6 14.3 9.6<br>~~|~~<br>~~ee~~|23.6 14.3 9.6<br>~~|~~<br>~~ee~~|6.9<br>~~|~~<br>~~ee~~|5.1<br>~~|~~<br>~~ee~~|
|||261(118)<br>~~|~~<br>~~ere~~<br>~~Se~~<br>~~ee~~|112(79.8)<br>~~|~~<br>~~ee~~|)<br>40.6<br>~~|~~<br>~~ee~~<br>~~eee~~|20.7 12.4 8.3<br>~~|~~<br><br>~~eee~~|20.7 12.4 8.3<br>~~|~~<br>~~ee~~<br>~~eee~~|20.7 12.4 8.3<br>~~|~~<br>~~ee~~<br>~~eee~~|6.1<br>~~|~~<br>~~ee~~<br>~~eee~~|4.5<br>~~|~~<br>~~ee~~<br>~~eee~~|
|1"- 260S<br>and<br>1"- 260L<br> <br>||Brass<br>Carbon steel<br>A.I.S.I. 304 and 316 300<br>Monel<br> ~~ere~~<br>~~Se~~<br>~~Se~~<br>~~ee~~<br>~~ee~~|207(59.3)<br>~~ere ~~<br>~~Se~~<br>~~ee~~<br>~~OD~~|102(47.6)<br> ~~ee ~~<br>~~OD~~|)<br>37.0(28)<br> ~~ee ~~<br>~~eee~~<br>~~OD~~|18.8 11.4 7.6<br> <br>~~eee~~<br>~~OD~~|18.8 11.4 7.6<br> ~~ee~~<br>~~eee~~<br>~~OD~~|18.8 11.4 7.6<br>~~ee~~<br>~~eee~~<br>~~OD~~|5.5<br>~~ee~~<br>~~eee~~<br>~~OD~~|4.1<br>~~ee~~<br>~~eee~~<br>~~OD~~|
|||290(106)<br>~~ee~~<br>~~OD~~|143(84.3)<br>~~OD~~|)<br>51.6(50.6)26.2 15.9 10.6 7.6<br>~~eee~~<br>~~OD~~|26.2 15.9 10.6 7.6<br>~~eee~~<br>~~OD~~|26.2 15.9 10.6 7.6<br>~~eee~~<br>~~OD~~|26.2 15.9 10.6 7.6<br>~~eee~~<br>~~OD~~|26.2 15.9 10.6 7.6<br>~~eee~~<br>~~OD~~|5.7<br>~~eee~~<br>~~OD~~|
|||A.I.S.I. 304 and 316 300(148)<br>~~ee~~<br>~~OD~~<br>~~ee~~|148(117)<br>~~OD~~<br>~~ee~~|53.5<br>~~eee~~<br>~~OD~~<br>~~ee~~|27.2 16.5 11.0 7.9<br>~~eee~~<br>~~OD~~<br>~~ee~~|27.2 16.5 11.0 7.9<br>~~eee~~<br>~~OD~~<br>~~ee~~|27.2 16.5 11.0 7.9<br>~~eee~~<br>~~OD~~<br>~~ee~~|27.2 16.5 11.0 7.9<br>~~eee~~<br>~~OD~~<br>~~ee~~|5.9<br>~~eee~~<br>~~OD~~<br>~~ee~~|
|||261 (118)<br>~~OD~~<br>~~ee~~|128 (93.3)<br>~~OD~~<br>~~ee~~|128 (93.3)<br>46.7<br>~~OD~~<br>~~ee~~|23.7 14.4 9.5<br>~~OD~~<br>~~ee~~|23.7 14.4 9.5<br>~~OD~~<br>~~ee~~|23.7 14.4 9.5<br>~~OD~~<br>~~ee~~|6.9<br>~~OD~~<br>~~ee~~|5.1<br>~~OD~~<br>~~ee~~|



**B-19**

Updated at June 9, 2026

Omega is a globally recognized leader in the design and manufacture of state-of-the-art products for process measurement and control. Renowned for its engineering expertise, the company provides highly reliable solutions for monitoring critical parameters such as temperature, humidity, pressure, strain, and flow across diverse industrial applications. Our extensive selection of Omega products is focused on the brand's core strengths in sensing and automation technologies. The range features a vast array of high-precision temperature sensors, including industry-standard thermocouples and RTDs, supported by a comprehensive selection of essential sensor accessories. To complement these measurement devices, we offer a substantial lineup of robust temperature controllers and advanced pressure transducers engineered to maintain precise conditions in demanding environments. Beyond primary sensing and control, the Omega portfolio encompasses sophisticated panel instrumentation for clear process visualization, alongside highly accurate force sensors and load cells. The offering is completed by reliable signal converters, data acquisition tools such as dataloggers, and fundamental connectivity components, providing professionals with the specialized equipment necessary to build complete, end-to-end industrial control systems.

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