CNC Machined Sprockets Chains are drive components cut from solid bar or forged blanks, not cast or sintered. We hold tooth profile tolerance to ±0.005 mm and pitch circle runout under 0.02 mm, so yo
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CNC Machined Sprockets Chains are drive components cut from solid bar or forged blanks, not cast or sintered. We hold tooth profile tolerance to ±0.005 mm and pitch circle runout under 0.02 mm, so yo
CNC Machined Sprockets Chains are drive components cut from solid bar or forged blanks, not cast or sintered. We hold tooth profile tolerance to ±0.005 mm and pitch circle runout under 0.02 mm, so your chain rides smooth at 10,000 RPM without whip or noise. Typical lead time is 7–10 days for custom steel sprockets, with surface hardness up to 58 HRC for abrasive environments.
Chain drive failure is almost always tooth wear or pitch mismatch. Our 5-axis CNC machining centers cut involute tooth forms directly from solid, eliminating the draft angle and porosity of cast sprockets. We hold tooth-to-tooth pitch error to ±0.008 mm, which means the chain pins engage and release without impact loading. For roller chain (ANSI 40 to 240) and engineering class chain (up to 36" pitch), we cut tooth count from 8 to 120 teeth on one setup. This reduces cumulative indexing error, so the chain does not stretch unevenly across the sprocket face.
We machine sprockets from 1045 carbon steel, 4140 chromoly, 420 stainless, and 17-4 PH for corrosive washdown lines. For high-wear applications, we carburize to 58–62 HRC case depth 0.5–1.0 mm, or induction harden teeth only to 55 HRC leaving the bore soft for keyway cutting. If you need non-metallic, we turn acetal (POM) and nylon 6/6 with glass fill for quiet, lube-free operation. Here is the real spec range we quote daily:
| Material | 1045, 4140, 420 SS, 17-4 PH, POM, nylon |
| Tooth count | 8 – 120 teeth (standard ANSI and metric) |
| Pitch diameter | 20 mm – 600 mm (0.8" – 24") |
| Hardness (steel) | 45 HRC (through) to 62 HRC (case) |
| Bore tolerance | H7 (+0.012 / 0) standard, custom on request |
| Tooth profile tolerance | ±0.005 mm |
| Pitch circle runout | ≤0.02 mm |
| Surface finish (teeth) | Ra 0.8 µm (grinded), Ra 1.6 µm (milled) |
| Keyway | Parallel key per DIN 6885, or involute spline |
| Lead time | 7 days (standard steel), 3 days (aluminum/POM) |
| MOQ | No minimum quantity (no MOQ) |
Most sprocket suppliers ignore dynamic balance above 3,000 RPM. We don't. Every sprocket over 150 mm diameter is dynamically balanced to G2.5 grade (per ISO 1940) when you request high-speed operation. We remove material from the hub flanks, not the tooth face, so the chain engagement geometry stays untouched. For twin-strand or triplex sprockets, we clock the tooth phases between rows to within 0.01 mm angular deviation — this prevents one strand from carrying all the load. We verify runout on a fixture with a dial indicator at three points: bore, pitch circle, and tooth face. The report ships with the parts.
We do not guess — we measure. Every sprocket goes through a CMM (coordinate measuring machine) with a 0.5 mm ruby probe scanning the tooth flanks. We compare the measured profile to the theoretical involute using your chain manufacturer's data (e.g., Rexnord, Tsubaki, or ISO 606). We check that the chain sits at the correct seating depth — not too high (jumping) and not too low (binding). For sprockets with hardened teeth, we run a Rockwell test on a sacrificial test piece from the same batch, not on the sprocket itself. A full inspection report (PDF) with CMM points, hardness values, and runout readings is emailed to you before packing. We do not ship parts without this report, ever.
We cut keyways to DIN 6885, ANSI B17.1, or your custom width, with broaching on larger bores and wire EDM for blind keyways. For quick-fit applications, we machine a taper lock bore (bushing type) with a keyway and tapped holes — you can mount the sprocket in 5 minutes without a press. We also drill and tap set screw holes at 90° or 120° spacing, and we can add a retaining ring groove per DIN 471. The bore is honed to H7 tolerance so it slides onto a shaft without scoring, but you still get zero backlash. If you are unsure about the fit, send us your shaft diameter and key size — we will confirm the class fit in the quote.
Need one sprocket to replace a worn unit on a production line? We treat that as a standard job, not a small-order penalty. Because we use CNC turning and milling, there is no mold or tooling cost, so a single piece costs only 20–30% more per unit than a batch of 100. We have cut 1-off sprockets for a cement plant on a Friday and shipped them DHL express on Monday. For obsolete chain sizes (e.g., ANSI 60 with 13 teeth, or BS 228 series), we can reverse-engineer from a sample or a drawing. We also offer sprocket repair — we weld up worn teeth and re-cut them if the hub is still good. That saves you 60% of a new part cost.
Bare machined steel rusts in days. We offer black oxide (magnetite) for indoor use, zinc plating (clear or yellow) for light outdoor exposure, and hard chrome plating (0.02 mm thick) for washdown or chemical environments. For stainless sprockets, we electropolish to Ra 0.4 µm for easy cleaning. If you run in a dusty environment, we apply a dry film lubricant (Molykote D-321R) on the tooth flanks to reduce initial wear. Each finish is applied after heat treatment, so we do not lose hardness. Tell us your environment — we will recommend the right coating in the quote, not upsell you.
Before you make a cutting decision, check our CNC cutting tool selection guide to understand how tool geometry affects sprocket tooth finish. And if you are designing a new drive, our CNC machining tolerances guide explains why ±0.005 mm matters for chain life.
No MOQ — we machine one piece or 10,000 pieces at the same quality, with no tooling charge for standard tooth counts.
Yes, send us a sample or a rough sketch with pitch, tooth count, and bore size — we will measure with CMM and produce a drawing for your approval before cutting.
Every prototype gets the same CMM inspection and runout report as a production batch, because a failed prototype wastes your testing time.
For 1045 steel with 20–60 teeth and a plain bore, we can machine and ship in 3 working days if you confirm the drawing by 10 AM China time.
Get a firm quote within 12 hours. Send your drawing or sample photo to sc@bquq.com, or WhatsApp us at +86 13713157787. We reply with price, lead time, and a DFM note — no obligation. Precision manufacturing, made in China, no MOQ.
| 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 |
