Sand cast · Machined · Inspected to print
Low to Medium Volume
Gray Iron
Sand Castings
One accountable partner from print to finished part, starting with tooling we design and control. You'll hear back within one business day.
Designed into the pattern
- 60+ Years in business
- Certified Pattern makers
- ISO 9001 2015 certified
- No minimum Prototype to repeat
What we design around before the tooling is built
These are the problems that usually show up later, at the foundry, in machining, or in the field. We look for them before tooling is built.
- WALLS
Thin sections
Thin walls and sharp corners cool fast and can chill hard. We point out thin walls before tooling.
- SHRINKAGE
Heavy sections
Heavy spots and thick-to-thin changes are where shrink shows up. We point them out before tooling is built.
- STOCK
Machined features
Machined faces and bores need enough stock to clean up. We check stock before tooling.
- LEAK TEST
Pressure-tight parts
Pump, valve and hydraulic housings that must hold pressure need a plan. If the print calls for a pressure test, it goes in the quote.
- TESTING
Class and test callouts
Hardness ranges, class requirements and separately cast test bars add cost and lead time. We list them on the quote.
- FIT
If your part isn't a good fit, we'll tell you quickly.
You get a straight answer before anyone spends time on a quote.
Capabilities
Gray iron (cast iron) sand castings from print review through finished, machined parts.
| Classes | ASTM A48 Class 25, 30, 35, 40. Class chosen for strength, machinability and damping. |
|---|---|
| Casting weight | 0.1 to 3,000 lb |
| Minimum wall | 0.200" typical. Thinner or heavier depending on the job and section. |
| Quantity | Prototype through repeat production. No minimum order. |
| Molding | Green sand, no-bake, 3D printed molds for prototypes and complex cores |
| Pattern tooling | Wood, urethane, aluminum. Designed and controlled by a certified pattern maker. |
| Foundry partner | Each job goes to the foundry partner best suited to its class, size and quantity. We oversee it from tooling to finished part. |
| Heat treat | Stress relief, annealed, and others per spec |
| Machining | Finished to print |
| Finishing | Paint, coating, oiling |
| Inspection | Magnetic particle, liquid penetrant, dimensional layout, FAIR, PPAP |
| Industries | Defense, power generation, agriculture, engines, locomotive, industrial equipment |
| Documentation | Material certs checked against your print and spec revision. MIL-spec supported. |
| Quality | ISO 9001:2015 certified |
Gray iron castings we've supplied
Ported housings, brackets, elbows, and machined flanges.
Choosing a gray iron class
The class number is the minimum tensile strength in ksi: Class 30 means 30,000 psi. If the class on your print is not the best fit for the part, we will tell you.
| Class | Typical use | Heat treat |
|---|---|---|
| Class 25 | Easiest to machine, best damping and heat transfer. Covers, light housings, machine bases. | As cast |
| Class 30 | General-purpose and most common. Housings, pump bodies, brackets, machine frames. | As cast, stress relief |
| Class 35 | Higher strength for more heavily loaded parts. Pump and compressor housings, engine and gear housings. | As cast, stress relief |
| Class 40 | Highest strength we offer in gray iron; harder to machine. Hydraulic and pressure housings, heavy-duty parts. | Stress relief |
Common questions
What buyers usually ask before they send a print.
Do you do prototypes?
Yes. Prototype through repeat production. For quick prototypes and complex cores, 3D printed sand molds need no pattern at all.
Is there a minimum order?
No. One piece or a production run.
Can parts ship machined?
Yes. Machining, heat treat, finishing and inspection are part of one program, so parts arrive finished to print.
What documents come with the parts?
Material certs checked against your print and spec revision. FAIR, PPAP, magnetic particle and liquid penetrant reports when required. ISO 9001:2015 certified.
Do you sign NDAs?
Yes, on request, before you send the print.
What should I send?
PDF drawing and CAD model, class, quantity, drawing revision and any specs. You will hear back within one business day.
CPM Industries has always been available to help when timing matters. Their expertise and skill in producing pattern equipment accurately and on time has been invaluable to me and my company.
Rich
Send the print.
We'll tell you if it's a fit.
You'll hear back within one business day. The first reply confirms we have your RFQ and tells you if it's a fit. Then we quote. NDAs signed on request.
630.469.8200 · Monday to Friday, 7:30 AM to 4:00 PM CT
What to send
- 01 PDF drawing and CAD model
- 02 Class and quantity
- 03 Drawing revision and specs
- 04 Machining, heat treat, inspection, and documentation needs