Bearing Housing
Machined bearing seats, an oil sump and a foot rigid enough to hold both in line.
The housing carries every load the rotating assembly makes — radial from the impeller, axial from the pressure difference across it, and whatever the coupling adds. All of that goes through two bearing seats that have to stay concentric with each other and square to the mounting face.
Which is why both seats are bored in one set-up. Re-fixturing between them is how a housing ends up with the shaft running out of true, and the bearings tell you about it within weeks.
| Casting process | Vertical-line sand moulding on two lines (national patent) |
| Materials | Grey iron · ductile iron · WCB carbon steel · CF8M stainless |
| Machined features | Both bearing seats · mounting face · spigot register · oil level and drain bosses |
| Minimum order | 100 pieces |
| Certification | EN 10204 3.1 per heat, spectrometer results |
| Source of geometry | Your drawing, 3D file or a worn sample |
What Is Difficult About This One
Every casting has one or two features that decide whether the batch repeats. On this part they are these.
Sump wall and seat wall are different thicknesses
The sump is thin, the seat boss is thick. Feeding has to keep the boss hot while the sump is already solid, or the seat comes out porous.
Foot section carries the alignment
A foot that flexes takes the bores out of line under load. Section there is generous and ribbed back into the body.
Both seats bored in one set-up
Not a casting point but the reason the casting is designed the way it is — the part has to present both seats to the machine at once.
Alloy Options
The same geometry is a different part in three different plants. Chloride content, abrasion and temperature drive the choice — not the name of the fluid.
| Alloy | Grade | When it is the right choice |
|---|---|---|
| Grey iron | HT200 / HT250 | Default for water duty. Damps vibration, machines easily, lowest cost. |
| Ductile iron | QT450 / QT500 | When the duty is cyclic or the part takes shock. Tougher than grey. |
| WCB carbon steel | ASTM A216 WCB | Higher strength, weldable. For pressure-bearing bodies. |
| CF8M stainless | ASTM A743 CF8M | Chloride and corrosion duty — the cast equivalent of 316. |
What to Send Us
These are the ones specific to this part. A drawing, a 3D file or the worn original covers all of them at once.
| Item | Why it matters |
|---|---|
| Bearing designations | Both ends — they set the seat diameters and widths |
| Shaft centre height | From the mounting face to the bore axis |
| Lubrication | Oil bath, grease or oil mist — it changes the sump and the bosses |
