Want a spiral miter with a finished bore? MMSA and MMSB are the finished-bore family on the KHK page.
Customer: What distinguishes this family?
KAYO: MMSA / MMSB is listed as finished bore spiral miter gears in the KHK range. The manufacturer identifies the material as SCM415. Miter gears are used where a change in shaft direction is needed with a 1:1 tooth-count ratio.
Customer: Which sizes are listed?
KAYO: The current Japanese selection table shows 40 model codes. Modules: 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 8, 10. Tooth counts: 20. Representative dimensions are shown below, followed by the complete model list. Mass is stated in kilograms.
| Model | Module | Teeth | Outside diameter (mm) | Mass (kg) |
|---|---|---|---|---|
| MMSA1-20R | 1 | 20 | 21.29 | 0.018 |
| MMSA2-20L | 2 | 20 | 42.52 | 0.13 |
| MMSA3.5-20R | 3.5 | 20 | 74.53 | 0.46 |
| MMSA5-20L | 5 | 20 | 106.25 | 1.32 |
| MMSA10-20L | 10 | 20 | - | 7.88 |
Customer: How should I select the mating gear?
KAYO: Compare the bore, keyway and fastening details of the exact A or B model and use the specified mating spiral gear. Module and tooth count are only part of the selection; the tooth system and assembly geometry must also agree. Use the manufacturer mating guidance for the exact family.
Customer: What are the exact model numbers?
KAYO: MMSA1-20R, MMSB1-20R, MMSA1-20L, MMSB1-20L, MMSA1.5-20R, MMSB1.5-20R, MMSA1.5-20L, MMSB1.5-20L, MMSA2-20R, MMSB2-20R, MMSA2-20L, MMSB2-20L, MMSA2.5-20R, MMSB2.5-20R, MMSA2.5-20L, MMSB2.5-20L, MMSA3-20R, MMSB3-20R, MMSA3-20L, MMSB3-20L, MMSA3.5-20R, MMSB3.5-20R, MMSA3.5-20L, MMSB3.5-20L, MMSA4-20R, MMSB4-20R, MMSA4-20L, MMSB4-20L, MMSA5-20R, MMSB5-20R, MMSA5-20L, MMSB5-20L, MMSA6-20R, MMSB6-20R, MMSA6-20L, MMSB6-20L, MMSA8-20R, MMSA8-20L, MMSA10-20R, MMSA10-20L.
Customer: What should I check before installation?
KAYO: Confirm mounting distance, shaft alignment, bearing support and backlash. Check the contact pattern during assembly and choose lubrication suited to the selected material and operating conditions. Evaluate the load rating against the actual speed and duty.
Customer: What should I send for an enquiry?
KAYO: Please share the complete model code, quantity, mating gear, shaft angle, bore and keyway requirements, operating speed and load. We can discuss the specification and availability for your application.
References: MMSA / MMSB official model selection table | KHK miter range. Confirm final dimensions and suitability against the latest manufacturer drawing.