Materials
Billet Aluminum Parts
Custom parts cut from a solid block, for performance and motorsport.
Billet aluminum parts are cut from a solid block or bar of aluminum rather than cast or forged, which is why they’re the go-to for performance and motorsport work like valve covers, wheel spacers, shifter knobs, gas caps, and engine brackets. Send a 2D PDF or 3D STEP file and get a quote from a real person in 24-48 hours. No minimum order, standard lead time 4-6 weeks (rush 1-2 weeks), and every part is inspected before it ships.
Updated June 2026
What “billet” actually means
Billet just means the part starts as a solid piece of wrought aluminum, a block or a length of bar, and the shape is cut away from it. Nothing is poured into a mold. Because the stock is rolled or extruded before anything touches it, the grain is consistent and there are no casting voids, so a billet part is typically stronger and more uniform than a cast equivalent of the same alloy.
For the aftermarket that translates to parts that look clean, hold tolerance, and stand up to load, which is why “billet” has become shorthand for the upgrade version of a part, a step up from a stamped or cast piece. It is the performance corner of CNC machined aluminum parts more broadly. Send a model or a custom billet block design and the team will quote it from the solid.
The billet aluminum parts we quote
Common requests run across the performance and motorsport world: valve covers and coil covers, billet wheel spacers and adapters, shifter knobs and shift plates, fuel and gas caps, catch cans, pulleys, brackets and mounts, caps and fittings, and weld-in bungs that thread or weld into a tube or tank. One-off show pieces and small batches for a product line are both normal orders here.
Round parts like spacers, caps, knobs, and bungs are turned; covers, plates, and brackets are milled; many parts use both. You send one model and get one quote, and the team sorts out how it’s made.
6061 vs 7075 for billet parts
6061 is the everyday billet aluminum: it machines cleanly, anodizes well, resists corrosion, and is strong enough for the large majority of covers, spacers, and trim. Reach for 7075 when the part carries real load or needs the highest strength-to-weight (suspension hardware, structural brackets, high-stress spacers), knowing it costs more and is less corrosion-resistant, so it usually wants an anodized or coated finish.
If you’re not sure which grade a part needs, say what it does and the quote comes back with a recommendation rather than a guess. See the 6061 vs 7075 comparison for the full breakdown.
Finishes and getting a quote
Most billet aluminum parts get anodized, clear or color, for looks and corrosion resistance; bead-blast, brushed, polished, and powder-coat finishes are all on the table too. Call the finish out when you send the files so it’s in the price. Then send a STEP model and a drawing through the quote form with material, quantity, and finish, and a real person prices it in 24-48 hours, free design review included.
Questions
Before you send a job.
01 What does billet aluminum mean?
It means the part is cut from a solid block or bar of wrought aluminum instead of cast or forged. The grain stays consistent and there are no casting voids, so billet parts are typically stronger and more uniform than a cast version of the same alloy.
02 Can you make custom billet wheel spacers?
Yes: send the bolt pattern, center bore, thickness, and stud detail (a drawing or model is ideal) and they get quoted as turned billet parts. Wheel spacers are safety parts, so the critical fits are inspected to your callouts before they ship.
03 What aluminum do you use for billet parts?
6061 for most covers, spacers, and trim, since it machines and anodizes well. 7075 when the part carries load and needs the highest strength-to-weight. Tell us what the part does and the quote includes a grade recommendation.
04 Can you anodize billet aluminum parts?
Yes: clear or color anodizing is common, and bead-blast, brushed, polished, and powder-coat finishes are available too. Name the finish when you send the files so it’s included in the quote.
05 Do you make one-off billet parts or only batches?
Both. A single custom valve cover or a small production run of spacers are quoted the same way, and there’s no minimum order.
Related
Where to go next.
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