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Chiaravalli CHC 25 helical gear unit
Chiaravalli

CHC 25 Helical Gear Unit (Ø25 mm output shaft)

Helical Gearboxes

CHC 25 helical gear unit — Chiaravalli's modular helical series with an aluminium housing, carbonised and ground gears, and a standard IEC motor input (B5 or B14 flange) — no coupling or adaptor needed: the motor bolts straight on. Solid keyed output shaft, Ø25 mm h6; foot or output-flange mounting (see the dimension sheet), any mounting position. Lubricated for life with synthetic oil (Shell Tivela S 320) in the standard position — for V6 / V3 mounting tell us, the fill quantity changes. Fits IEC 71, 80, 90 motors, recommended motors up to 2.2 kW. Where the table notes a reduction bushing, the motor shaft is adapted to the pinion with Chiaravalli's metal bushing (supplied with the unit).

Supplied without motor. You are choosing the gear unit only — ask us to quote a suitable motor together with it if you'd like both.

How to pick from the table: with a standard 4-pole motor (1400 r/min), the ratio sets the output speed — e.g. ratio 5.5:1 gives 255 r/min at the output shaft. Choose the row whose output speed and torque match your application, then the flange that matches your motor (the frame size and shaft diameter are on the motor's nameplate). The Motor column lists the motors that fit that row — pick yours and the output torque and service factor update to match. More in the Selection Guide tab below.

Typical applications: textile, food and beverage, chemical and packaging machinery — conveyors, mixers, OEM drives.

Product Configuration

Select a row to add it to your quote

CodeRatioMotor flangeMotorOutput speedOutput torqueService factor Weight
CHC-25 R.5.5 71F14 5.5:1 IEC 71 · 14 mm shaft 0.55 kW 257 r/min 20 Nm 5.09 5.8 kg
CHC-25 R.5.5 80F19 5.5:1 IEC 80 · 19 mm shaft 1.1 kW 257 r/min 39 Nm 2.55 5.8 kg
CHC-25 R.5.5 90F24 5.5:1 IEC 90 · 24 mm shaft 2.2 kW 257 r/min 79 Nm 1.27 5.8 kg
CHC-25 R.7.4 71F14 7.4:1 IEC 71 · 14 mm shaft 0.55 kW 190 r/min 27 Nm 4.53 5.8 kg
CHC-25 R.7.4 80F19 7.4:1 IEC 80 · 19 mm shaft 1.1 kW 190 r/min 53 Nm 2.26 5.8 kg
CHC-25 R.7.4 90F24 7.4:1 IEC 90 · 24 mm shaft 2.2 kW 190 r/min 106 Nm 1.13 5.8 kg
CHC-25 R.9.9 71F14 9.9:1 IEC 71 · 14 mm shaft 0.55 kW 141 r/min 36 Nm 5.6 5.8 kg
CHC-25 R.9.9 80F19 9.9:1 IEC 80 · 19 mm shaft 1.1 kW 141 r/min 71 Nm 2.8 5.8 kg
CHC-25 R.9.9 90F24 9.9:1 IEC 90 · 24 mm shaft 2.2 kW 141 r/min 143 Nm 1.4 5.8 kg
CHC-25 R.12.1 71F14 12.1:1 IEC 71 · 14 mm shaft 0.55 kW 116 r/min 43 Nm 4.6 5.8 kg
CHC-25 R.12.1 80F19 12.1:1 IEC 80 · 19 mm shaft 1.1 kW 116 r/min 87 Nm 2.3 5.8 kg
CHC-25 R.12.1 90F24 12.1:1 IEC 90 · 24 mm shaft 2.2 kW 116 r/min 174 Nm 1.15 5.8 kg
CHC-25 R.14.8 71F14 14.8:1 IEC 71 · 14 mm shaft 0.55 kW 94.6 r/min 53 Nm 3.75 5.8 kg
CHC-25 R.14.8 80F19 14.8:1 IEC 80 · 19 mm shaft 1.1 kW 94.6 r/min 107 Nm 1.87 5.8 kg
CHC-25 R.14.8 90F24 14.8:1 IEC 90 · 24 mm shaft 1.5 kW 94.6 r/min 146 Nm 1.37 5.8 kg
CHC-25 R.17.1 71F14 17.1:1 IEC 71 · 14 mm shaft 0.55 kW 81.9 r/min 62 Nm 2.27 5.8 kg
CHC-25 R.17.1 80F19 17.1:1 IEC 80 · 19 mm shaft 1.1 kW 81.9 r/min 123 Nm 1.14 5.8 kg
CHC-25 R.17.1 90F24 17.1:1 IEC 90 · 24 mm shaft 1.1 kW 81.9 r/min 123 Nm 1.14 5.8 kg
CHC-25 R.20.1 71F14 20.1:1 IEC 71 · 14 mm shaft 0.55 kW 69.7 r/min 72 Nm 2.76 5.8 kg
CHC-25 R.20.1 80F19 20.1:1 IEC 80 · 19 mm shaft 1.1 kW 69.7 r/min 145 Nm 1.38 5.8 kg
CHC-25 R.20.1 90F24 20.1:1 IEC 90 · 24 mm shaft 1.5 kW 69.7 r/min 197 Nm 1.01 5.8 kg
CHC-25 R.23.9 71F14 23.9:1 IEC 71 · 14 mm shaft 0.55 kW 58.7 r/min 86 Nm 2.33 5.8 kg
CHC-25 R.23.9 80F19 23.9:1 IEC 80 · 19 mm shaft 1.1 kW 58.7 r/min 172 Nm 1.16 5.8 kg
CHC-25 R.23.9 90F24 23.9:1 IEC 90 · 24 mm shaft 1.1 kW 58.7 r/min 172 Nm 1.16 5.8 kg
CHC-25 R.28.9 71F14 28.9:1 IEC 71 · 14 mm shaft 0.55 kW 48.5 r/min 104 Nm 1.93 5.8 kg
CHC-25 R.28.9 80F19 28.9:1 IEC 80 · 19 mm shaft 0.75 kW 48.5 r/min 142 Nm 1.41 5.8 kg
CHC-25 R.28.9 90F24 28.9:1 IEC 90 · 24 mm shaft 1.1 kW 48.5 r/min 208 Nm 0.96 5.8 kg
CHC-25 R.35.9 71F14 35.9:1 IEC 71 · 14 mm shaft 0.55 kW 39 r/min 129 Nm 1.55 5.8 kg
CHC-25 R.35.9 80F19 35.9:1 IEC 80 · 19 mm shaft 0.75 kW 39 r/min 176 Nm 1.13 5.8 kg
CHC-25 R.35.9 90F24 35.9:1 IEC 90 · 24 mm shaft 1.1 kW 39 r/min 259 Nm 0.77 5.8 kg
CHC-25 R.40.6 71F14 40.6:1 IEC 71 · 14 mm shaft 0.55 kW 34.5 r/min 147 Nm 1.36 5.8 kg
CHC-25 R.40.6 80F19 40.6:1 IEC 80 · 19 mm shaft 0.75 kW 34.5 r/min 200 Nm 1 5.8 kg
CHC-25 R.40.6 90F24 40.6:1 IEC 90 · 24 mm shaft 1.1 kW 34.5 r/min 293 Nm 0.68 5.8 kg
CHC-25 R.46.5 71F14 46.5:1 IEC 71 · 14 mm shaft 0.55 kW 30.1 r/min 167 Nm 1.2 5.8 kg
CHC-25 R.46.5 80F19 46.5:1 IEC 80 · 19 mm shaft 0.55 kW 30.1 r/min 167 Nm 1.2 5.8 kg
CHC-25 R.46.5 90F24 46.5:1 IEC 90 · 24 mm shaft 1.1 kW 30.1 r/min 333 Nm 0.6 5.8 kg

Product Information

Motor pole count

All table figures assume a 4-pole motor (1400 r/min input) — the standard choice for most applications. A 2-pole motor (2800 r/min) doubles the output speed and a 6-pole motor (900 r/min) reduces it, and the power and torque ratings change with them — if you're running anything other than 4-pole, contact us and we'll size it for you.

Service factor — the number that decides how long your gearbox lives

It's the safety margin between what the gearbox can handle and what the motor asks of it: 1.0 means the gearbox works exactly at its rated limit; higher means reserve capacity — a cooler, quieter drive and a much longer life. As a guide: smooth, steady loads (light conveyors, centrifugal pumps) are fine near 1.0; moderate loads (heavier conveyors, packing machines) deserve 1.3 or more; heavy duty (mixers, bucket elevators, frequent starts, long running hours) should sit at 1.5–2.0.

If the service factor turns red after you pick a motor, that combination is below 1.0 — the motor can overload the gearbox in continuous use. It may be acceptable for light, intermittent duty, but for anything continuous choose a smaller motor, a different ratio, or the next gearbox size up — or ask us and we'll size it with you.

Check your selection with the Chiaravalli configurator

Need help specifying this product?

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