High-Quality Stainless Steel KF 90 Degree Elbow for Vacuum Systems | Custom Vacuum Piping Fittings

When your custmer’s technician is assembling a semiconductor deposition chamber or a lab’s turbo pump manifold, they’ll need a 90-degree turn that doesn’t introduce turbulence or leaks — that’s basically what this KF elbow is designed for, and we’ve seen it used in industrial coating systems too.

Welded from SS304 or SS316 with a phosphide surface treatment (which actually helps with corrosion resistance in humid cleanroom environments), available sizes run form KF16 up to KF50, and we stock standard sizes so lead time is typically 5-7 days — but check for non-standard.

It holds vacuum down to 10-9 mbar across temperature range of -20°C to 150°C, which is better than many cast elbows for this appliction, and the welding connection means no O-ring to worry about at the joint — just a clean, permanent fit.

Most buyers go with SS316 for systems handling aggressive process gases, but SS304 works fine for general vacuum duty; we also offer full material certs and pressure test reports on request, usually within 20 days or so if you need them for compliance.

It’s not suited for high-vibration environments where you’d want a flexible coupling instead — that’s just a fact of rigid elbows — and teh phosphide finish doesn’t hold up to constant chemical spray, so keep that in mind for wet application.

Payment is T/T or L/C at sight for bulk orders, MOQ is typically 50 units or so for custom sizes, and our company can match DIN, ANSI, GB, JIS, or BSW standard base on your spec sheet.