&#60;p&#62;A non-magnetic assembly is required when drilling with a magnetic steering tool. This will normally consist of an orienting sub (or a PWD/ Pressure While Drilling sub), a non-magnetic drill collar and a bent sub if necessary.&#60;/p&#62;&#13;&#10;&#13;&#10;&#60;p&#62;There are many different types of non-magnetic alloys available for manufacture into a non-magnetic assembly, which cover a wide range of physical properties and prices.&#60;/p&#62;&#13;&#10;&#13;&#10;&#60;p&#62;We would strongly recommend customers against using softer &#38;ldquo;retail&#38;rdquo; alloys such as 316L stainless steel for downhole assembly items. These alloys are too soft and susceptible to wear resulting in frequent connection damage by overtorque. Using a softer stainless steel like 316L may save money in the short term but it will cost more in the long term thanks to more frequent repairs and potential assembly losses due to tool failure.&#60;/p&#62;&#13;&#10;&#13;&#10;&#60;p&#62;Kampen Machinefabriek Velsen has over 20 years experience in sourcing material and building non-magnetic assembly items, both for oil and gas customers and HDD customers.&#60;/p&#62;&#13;&#10;