Precision CNC Machined Stainless Steel 304 Medical Grade Pump Body for Fluid Transfer Systems

A pump body that handles saline at 80 psi and doesn't pit after 200 autoclave cycles — that's the real test, not some tensile strength number on a data sheet. We've made hundreds of these for fluid handling OEMs, and the failure mode is almost always the same: porosity in the castings they were using before switching to our CNC-machined version.

Here's the thing about 304 pump bodies. The internal passages are the hard part. You've got intersecting bores, threaded ports at weird angles, and a sealing surface that needs to be flat to within 0.02mm while the rest of the body holds pressure. If your shop is doing this on a 3-axis and flipping the part six times, you're asking for datum drift. We run these on 4-axis machines — top features, port bores, and the main chamber in one setup. The second setup handles the bottom flange and outlet port. Two setups, one datum system.

304 machines slower than aluminum — everyone knows that. But the real cost driver is tool wear. We use coated carbide inserts with high-pressure coolant (70 bar) to keep the cutting zone clean and extend tool life by 3-4x. That matters when you're running 500 pump bodies and don't want to change inserts every 20 parts.