Differential Gears
Bevel pinions and side gears for differentials, lapped as sets and case hardened.
Differential gears cut and lapped in sets, because they run continuously against each other and the contact pattern has to be matched. Case hardened and finished after heat treat.
6–9 weeks
5 pieces
ISO 9001:2015 · IATF 16949
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Gear quality | AGMA 9–11 | class |
| Module range | 2–8 | module |
| Contact pattern | Lapped sets | standard |
| Backlash | 0.05–0.20 | mm |
| Hardness | 58–62 (case) | HRC |
| Set matching | Per set, not per part | note |
Available Materials
- Steel 8620 (case hardened)
- Steel 4140
- Steel 9310
Typical Applications
- Vehicle differentials
- Axle drives
- Agricultural transmissions
- Industrial differentials
- Track drives
Surface Finishes
- Lapped sets
- Case hardened
- Shot peened
- Phosphate coated
- Black oxide
Industries Served
- Automotive & EV
- Agricultural Machinery
- Mining & Construction
- Industrial Equipment
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.
- Part size
- Module range at 2–8 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 8620 (case hardening), rates 7/10 on our machinability scale at 149–200 HB (as-supplied) · 58–62 HRC case after carburising. 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 5 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
- Rockwell hardness tester on the part, not only against the mill certificate
- 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
- Why can a differential gear not be replaced one at a time?
- Because the set is lapped together. A new pinion against a worn side gear runs on a contact pattern neither was made for, which is why they are supplied as matched sets.
Related part families
Bevel & Miter Gears
Straight and spiral bevel gears for right-angle drives, lapped in pairs to a matched contact pattern.
Hypoid Gears
Hypoid gear sets for offset right-angle drives, lapped and quiet under load.
Gear Blanks
Turned and hardened gear blanks with the bore and faces finished, ready for cutting or grinding.