This is CNC machined bicycle parts in aluminum, produced by BQUQ’s 20-year-old Dongguan factory. You get tolerances of ±0.005 mm on critical bore and interface dimensions, with runout held to 0.01 mm
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This is CNC machined bicycle parts in aluminum, produced by BQUQ’s 20-year-old Dongguan factory. You get tolerances of ±0.005 mm on critical bore and interface dimensions, with runout held to 0.01 mm
This is CNC machined bicycle parts in aluminum, produced by BQUQ’s 20-year-old Dongguan factory. You get tolerances of ±0.005 mm on critical bore and interface dimensions, with runout held to 0.01 mm on mating surfaces—enough for Shimano or SRAM drivetrain alignment. Lead time for a standard batch of 200 pieces is 12 days from drawing approval, and we offer hardness up to 60 HRC for wear-prone axles.
Runout kills bearing life. So we machine all steerer tubes and bottom bracket shells in a single clamping operation on 5-axis DMG MORI mills. This eliminates re-chucking errors that push runout above 0.02 mm. For threaded interfaces like bottom bracket cups, we use a live spindle with a synchronous tapping cycle—thread pitch error stays under 0.02 mm over a 30 mm length. That means your headset or BB30 bearings seat without preload, and you get a smoother ride with fewer creaks.
We start with 6061-T6 for general brackets and derailleur hangers—yield strength 276 MPa, anodizes clean. For cranks and pedal spindles, we switch to 7075-T651, which gives 503 MPa yield and a Brinell hardness of 150. No heat treatment after machining is needed for these grades. But if you need a hard-wearing surface, we offer hard anodizing (MIL-A-8625 Type III) to 60–70 HRC equivalent on 6061 parts. This is used for pulley wheels and chainring bolts where sliding wear is the failure mode.
Every batch gets a 100% dimensional check on critical features using a Zeiss CMM, with a report that lists each measured point against your GD&T callouts. We also verify anodizing thickness with an eddy current gauge—target is 25–50 microns, and we reject any part below 20 microns. For runout on round parts, we use a V-block and dial indicator, checking three positions along the axis. You receive a PDF report with the batch number, operator stamp, and pass/fail for each dimension.
Send us a STEP or IGES file, and we can start cutting by the next morning. Our programming team has 15 years of bike part experience—we know where to put draft angles for CNC milling and how to avoid thin walls on dropouts. For a typical derailleur hanger, we cut the first article in 3 days, get your approval on the fit, then run the full batch. If you need 50 pieces, we do it in 7 days. If you need 5,000, we add a second shift and hold the same 12-day timeline.
Cast aluminum bike parts come off the mold at Ra 3.2 µm or worse. We machine all sealing surfaces and bearing bores to Ra 0.4 µm using a wiper insert with a 0.8 mm nose radius. That gives you a surface that seals grease better in bottom brackets and reduces friction on brake lever pivots. For cosmetic areas like the top of a stem or chainring, we offer a brushed finish at Ra 0.8 µm, which hides finger smudges and takes anodizing evenly.
Most bike part factories demand a minimum of 500 pieces before they even look at your file. We do not. Order one custom stem or a hundred pre-production samples—we run the same program, same fixture, same inspection. This is because our CNC machines are set up with modular vises that switch from a single part to a 24-part tombstone in 10 minutes. So whether you are a boutique frame builder needing 5 headset spacers or a mass manufacturer needing 10,000 chainring bolts, you get the same ±0.005 mm tolerance and the same CMM report.
Aluminum does not rust, but it scratches. We wrap every part in anti-static foam, then place it in an individual polybag before boxing. For anodized parts, we add a desiccant pack to prevent water spotting during ocean freight. We ship via DHL or FedEx for prototypes (3–5 days to USA or EU) and by sea for full batches (25–30 days to Los Angeles or Rotterdam). All export paperwork—commercial invoice, packing list, and COO—is generated in-house, so your customs broker never waits on us.
| Specification | Value | Notes |
|---|---|---|
| Materials | 6061-T6, 7075-T651, 2024-T351 | Aluminum only; stainless steel available on request |
| Diameter range | 2 mm – 300 mm | Covers pedal spindles to chainrings |
| Length range | 5 mm – 600 mm | For steerer tubes and seatposts |
| Hardness (raw) | 150 HB (7075-T651) | No heat treat required |
| Hardness (anodized) | 60–70 HRC equivalent | MIL-A-8625 Type III, 25–50 microns |
| Machining tolerance | ±0.005 mm | On bore and thread pitch |
| Runout | 0.01 mm TIR | Measured on V-block at 3 points |
| Surface finish (machined) | Ra 0.4 µm | On bearing seats and sealing faces |
| Surface finish (cosmetic) | Ra 0.8 µm brushed | Optional bead blast or polish |
| Lead time (prototype) | 3 days | First article from your STEP file |
| Lead time (batch of 200) | 12 days | After drawing approval |
| MOQ | No MOQ | Order 1 piece or 10,000 |
No MOQ—you can order a single prototype or a full production run of 10,000, and the unit price only drops slightly with volume because our setup cost is already low.
Yes, send a STEP, IGES, or PDF drawing, or even a physical sample—we will reverse-engineer it in 24 hours and give you a quote with suggested tolerances for manufacturability.
We use a first-article inspection (FAI) on the first piece, then in-process checks every 50 pieces with a bore gauge and thread plug, plus a final CMM audit on 5% of the batch, all documented in a PDF report.
Prototype in 3 days, batch of 200 in 12 days, and batch of 5,000 in 18 days, all from the moment you approve the quote and send the drawing.
For tooling decisions that affect your part’s finish, see our CNC cutting tool selection guide. To understand how we set those ±0.005 mm numbers, read our CNC machining tolerances guide.
Send your drawing for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. We reply within one business hour, Monday to Saturday, Beijing time.
| Parameter | Capability |
|---|---|
| Materials | AL6061/7075, SUS303/304/316, 45# steel, T2 copper, H59 brass, POM, PEEK, nylon |
| Tolerance | ±0.005mm standard, ±0.003mm on request |
| Machines | 3/4/5-axis CNC, turn-mill, Swiss lathe |
| Surface | Anodizing, nickel, zinc, passivation, sandblast, polish |
| Size Range | Max 400 x 300 x 200 mm |
| Prototype | 72 hours, no MOQ on samples |
| Inspection | Full report per batch, CMM data on request |
