Tooling plate buyers want two things: flat, and a surface that doesn't need to be skimmed before the real work starts. Fixture plates, jig bases, vacuum plates, inspection plates and mold bases all start here. We source cast aluminum tooling plate, precision-milled aluminum plate and pre-hardened mold steel for Texas machine shops, saw cut to blanks so you machine features instead of squaring stock.
What tooling plate is and why shops buy it
Standard rolled plate carries internal stress. Cut a pocket and it moves. Tooling plate is made to stay put. Cast aluminum tooling plate is cast, stress relieved and machined flat on both faces, so it stays stable when you hog material out of one side. Precision-milled 6061 and 7075 plate starts as stress-relieved T651 plate with both faces milled to a close thickness, for when you need the strength or anodizing response of a wrought alloy.
Mold shops use steel. P20 is supplied pre-hardened to around 30 HRC, so a plastic mold cavity can be machined, polished and run without heat treat. 4140 pre-hard does a similar job for mold bases, backing plates and fixtures that need to be tougher than aluminum.
Common tooling plate grades
| Grade | Key traits | Typical uses |
|---|---|---|
| Cast aluminum tooling plate | Stress relieved, very stable when machined, both faces machined flat | Fixture plates, jig bases, vacuum plates, inspection plates |
| 6061-T651 precision-milled plate | Wrought strength, milled faces, anodizes well | Fixtures, machine components, base plates |
| 7075-T651 precision-milled plate | High strength aluminum, milled faces | Aluminum molds, high-load fixtures, tooling |
| P20 mold steel | Pre-hardened to about 30 HRC, polishes well | Plastic injection mold cavities and cores |
| 4140 pre-hard plate | Quenched and tempered, tough, machinable as supplied | Mold bases, backing plates, heavy fixtures |
Forms and surfaces
Cast aluminum tooling plate comes with machined faces, usually with a protective film, and is sold as full plate or saw-cut blanks. Precision-milled aluminum plate comes with both faces milled and film on each side. P20 and 4140 come as plate and blocks, usually with a rolled or saw-cut surface, and you plan machining stock on every face. If you want a finished-thickness face on steel, say so on the RFQ.
Typical tooling plate size ranges
| Form | Commonly available range |
|---|---|
| Cast aluminum tooling plate | 1/4" to about 4" thick; full plates up to 48" x 144" and larger |
| Precision-milled 6061 and 7075 plate | 1/4" to 4" thick; cut to blanks from full plate |
| P20 mold plate and blocks | 1/2" to 12" thick and heavier to order |
| 4140 pre-hard plate | 1/2" to 6" thick |
Commonly available ranges. Ask for anything outside them.
Cutting tooling plate
Blanks are saw cut from the plate, which keeps the machined faces untouched and the edges square enough to fixture. Shapes with internal cutouts or odd outlines go to waterjet, which adds no heat and won't distort a thin plate. Plasma and laser aren't a fit: heat warps precision plate and hardens steel edges. Give us finished blank sizes and how much edge stock you want, and we arrange it through cut-to-size.
Certs for tooling and mold plate
Most fixture work doesn't need paperwork, but mold makers and aerospace tooling customers often want the alloy, condition and hardness on record. P20 and 4140 pre-hard certs show the hardness as supplied; aluminum plate certs show alloy, temper and chemistry. We can get mill certs on request.