Timing Gears
Timing and index gears with keyway or dowel location, marked for one-way assembly.
Timing gears where the angular position is the function, not just the ratio. They carry a keyway, a dowel hole or a mark, and we check the phase with a CMM against the datum.
4–6 weeks
10 pieces
ISO 9001:2015 · IATF 16949
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Phase tolerance | ±0.05 | ° |
| Tooth quality | AGMA 9–11 | class |
| Location | Keyway / dowel / mark | - |
| Module range | 1–6 | module |
| Bore tolerance | H7 | - |
| CMM phase check | Per lot | - |
Available Materials
- Steel 4140
- Steel 8620 (case hardened)
- Aluminium 7075-T6
- Cast iron GG25
Typical Applications
- Engine timing trains
- Indexing drives
- Cam drives
- Registration in printing
- Packaging synchronisation
Surface Finishes
- Case hardened
- Ground flanks
- Black oxide
- Anodise (aluminium)
- Phosphate
Industries Served
- Automotive & EV
- Packaging
- Industrial Equipment
- Motorsport
- Agricultural Machinery
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Tolerance
- Phase tolerance at ±0.05 ° is the tightest callout this family carries. Tightening a callout is a process decision, not a machining decision: below the standard ±0.005 mm the work moves to grinding or jig boring, and the price moves with it.
- Part size
- Module range at 1–6 module decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Material
- The first material listed, Carbon Steel 4140 (42CrMo4), rates 6/10 on our machinability scale at 197–235 HB annealed · 28–32 HRC quenched and tempered. On this shop's scale a harder alloy means slower passes and more tool changes, and that is cycle time the quote has to carry.
- Order size
- Minimum order is 10 pieces, so on a first order setup and programming are spread over very few parts and they are most of the price. Repeat orders at the same quantity are cheaper without anything on the drawing changing.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
- Bore gauges and an optical comparator for hole position and edge form
- First article inspection to AS9102, because this family carries an aerospace or automotive certificate
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- How do you set the angular position?
- From the datum on the bore or the locating dowel, checked on the CMM. Do it by eye against a mark and the machine will run out of phase by the time it reaches the last station.
Related part families
Precision Spur Gears
AGMA 8–12 spur gears, hobbed and profile ground, from 12 mm to 800 mm pitch diameter.
Gear Blanks
Turned and hardened gear blanks with the bore and faces finished, ready for cutting or grinding.
Sprockets
Chain sprockets to ANSI and ISO profiles, hardened teeth and keyed or tapered bores.