Need a ground helical pinion for a compatible precision rack drive? KHK ZSTP is a focused family of left-hand models.
Customer: What makes this series useful?
KAYO: ZSTP uses SCM440 steel with ground teeth and a 19°31′41″ left helix. KHK lists its tooth hardness as HRC 50–60 and precision as JIS N6.
Customer: Which sizes can I choose?
KAYO: The current Japanese selection table lists 13 standard model codes, with module values 2, 3, 4, 5, 6 and tooth counts from 18 to 30. Here are examples from that table.
| Model | Module | Teeth | Outside diameter (mm) | Mass (kg) |
|---|---|---|---|---|
| ZSTP2-18L | 2 | 18 | 44 | 0.30 |
| ZSTP3-20L | 3 | 20 | 72 | 1.06 |
| ZSTP4-18L | 4 | 18 | 86 | 1.99 |
| ZSTP5-18L | 5 | 18 | 110 | 3.91 |
| ZSTP6-25L | 6 | 25 | 176 | 12.8 |
Customer: How do I select the right model?
KAYO: Confirm the matching rack specification, normal module, tooth count and mounting dimensions. Check travel per revolution and backlash against the selected rack system. Helical teeth create axial thrust, so include suitable bearing support and lubrication in the design.
Customer: What are the listed model numbers?
KAYO: The standard models shown in the official selection table are:
ZSTP2-18L, ZSTP2-24L, ZSTP2-30L, ZSTP3-20L, ZSTP3-25L, ZSTP3-30L, ZSTP4-18L, ZSTP4-24L, ZSTP4-30L, ZSTP5-18L, ZSTP5-24L, ZSTP6-20L, ZSTP6-25L
Customer: What should I send with an enquiry?
KAYO: Please share the complete model number, quantity, mating gear or rack details, bore and keyway requirements, operating speed and load. We can then discuss the specification and availability for your application.
Reference: KHK ZSTP official model selection table | KHK helical gear range. Dimensions and model availability should be confirmed against the latest manufacturer drawing.