Sand Casting Services

Sand casting handles metals with high melting temperatures at low cost, and it suits a wide range of part sizes and volumes. It is an affordable way to cast larger parts without expensive machining.

Investment casting suits smaller parts with intricate detail and an excellent surface finish, but it is more labor intensive. Sand casting produces larger, heavier parts at a lower cost and makes design changes easy.

Among the common metal casting methods, sand casting is the least expensive for smaller batch runs, and it stays cost effective for large-part production thanks to low tooling cost.

We cast grey iron, ductile iron, stainless steel, alloy steel, carbon steel, aluminum, and brass. Our engineering team confirms the best alloy for your part at the feasibility review.

Standard production lead time is 4 to 8 weeks, with tooling and first-article timing confirmed at the quote stage. Rush programs can be reviewed case by case.

Redstone is built for recurring production rather than one-off parts. We will tell you at the quote stage whether your volume is a fit and recommend the most cost-effective approach.

For most large and medium-volume parts, yes. The sand casting process uses low-cost expendable molds instead of hardened steel dies, so tooling spend stays low and the method is economical across a wide range of shapes and sizes. Die casting wins only at very high volumes of small, thin-wall non-ferrous parts where its higher tooling cost amortizes.

Sand casting is the right call when you need larger or heavier castings, a versatile process across many alloys, or low tooling cost for medium-volume production runs. It also handles complex geometries with internal cavities through bonded sand cores, and design changes are easy to absorb before tooling is committed.

Advantages: low tooling cost, a wide variety of metals from grey and ductile iron to steel, aluminum, bronze, and brass, and the ability to cast large parts and complex geometries. The trade-off is a rougher surface finish and looser tolerances than die or investment casting, so critical features are often finished by CNC machining after the casting solidifies.

We cast grey iron, ductile iron, stainless steel, alloy steel, carbon steel, aluminum, and brass, with bronze and copper alloys reviewed at feasibility. After shakeout, castings move to shot and sand blasting, grinding, CNC machining, heat treatment, powder coating, anodizing, and plating so the finished part ships ready to use.

Pattern costs depend on complexity, part size, and whether cores are needed. Simple patterns for small sand castings may start at a few hundred dollars, while large multi-part patterns with core boxes can run several thousand. Compared to steel die molds, the upfront investment is far lower. Redstone provides detailed quotes so you know the full cost before production runs begin.

Inconsistent wall thickness is the single biggest design error. Non-uniform walls cause uneven cooling, leading to porosity, sink marks, and warpage. Redstone addresses this through DFM review at the start of every project, checking wall thickness, gating design, and adding porosity controls such as degassing or vacuum impregnation where needed.

Redstone controls porosity through DFM wall-thickness review, gating design, and process capability validation. For parts where leak integrity matters, the control plan includes X-ray inspection to detect internal voids and shrinkage. On aluminum castings, we define acceptable porosity limits by pore size and pore count per square inch, established by X-raying reference samples.

Redstone regularly produces parts from physical samples when no drawings exist. We 3D scan them, build complete drawings, and add specifications including surface finish requirements and tolerances for mating features. This is useful for replacement parts and legacy components.