Brass or stainless for a coolant temperature sensor housing?
Brass where thermal response and machinability matter most and the coolant chemistry allows it; stainless where corrosion resistance and strength dominate. The published route for the coolant housing in this catalogue is brass with progressive die stamping, deburring and pickling.
Why brass is common here
Brass conducts heat well, machines cleanly for the threaded or sealing interface, and is straightforward to form in a progressive tool. It is chosen for the thermal job it does rather than for strength.
When to move to stainless
Where the coolant mix, a galvanic couple or the structural load makes brass the wrong answer, 316L is the usual substitute - and the pressed route changes with it, because stainless draws differently from brass.
Grade, wall thickness and tolerance are confirmed against the customer drawing. Batch heat treatment, slow wire cutting, passivation, electropolishing, plating, phosphating and coating are placed with qualified external processors and disclosed on the inspection plan. The quality system is ISO 9001:2015 with controls aligned to IATF 16949 requirements.