Ever Power · Industrial Gear Solutions

Helical Gearbox Series

Precision-engineered inline, right-angle, parallel-shaft and helical-worm gear reducers covering 0.12–200 kW motor power and output torque up to 50,000 N·m — built for industrial production lines worldwide.

Four Series, One Standard of Precision

Ever Power's helical gearbox programme spans four complementary series — R, K, F, and S — each optimised for a distinct set of installation geometries, torque demands, and speed-reduction requirements. All series share the same design philosophy: hardened and ground gear teeth, precision-matched roller , and a rigid cast-iron housing machined on a single datum for long-term alignment stability.

Each series is offered in multiple structural types (foot-mount, flange-mount, hollow-bore shaft-mount, torque-arm) to fit without custom engineering into the widest possible range of machine frames. VFD compatibility is standard, and IP65 sealing with food-grade or ATEX variants is available on request. Learn more about our engineering capabilities on the Ever Power about page, or contact our technical team for application support and selection assistance.

96–97%

50,000 N·m

Max Output Torque

0.12–200 kW

Motor Power Range

IP55 / IP65

Standard Protection Rating

Product Categories

Browse by Gear Reducer Series

R Series Inline Helical Gear Reducer
INLINE COAXIAL

R Series — Inline Helical Gear Reducer

Coaxial input-to-output layout; up to 3 helical stages; 96–97% per-stage efficiency; output torque to 18,000 N·m. Structural types: R (foot), RF (flange), RA (hollow shaft), RX (single-stage), R-R combined, R-SZ input shaft. Motor power: 0.12–200 kW; ratios: 1.3–289.

Torque: up to 18,000 N·m Ratio: 1.3–289 Efficiency: 96–97% IP55 standard

Structural Types

R foot-mount helical gearbox

R — Foot Mount

RF flange helical gearbox

RF — Flange

RX single stage helical gearmotor

RX — Single Stage

RXF flange single stage

RXF — Flange Single

R-R combined helical reducer

R+R — Combined

R-SZ input shaft helical gearbox

R-SZ — Input Shaft

K Series Right-Angle Helical Bevel Gear Reducer
RIGHT-ANGLE OUTPUT

K Series — Right-Angle Helical Bevel Gear Reducer

Helical pre-stages feeding a spiral bevel gear set for 90° output; output torque to 50,000 N·m; 95–97% efficiency. Structural types: K (foot), KF (B5 flange), KA (hollow bore), KAF (flange + hollow), KAB (compact hollow), KAT (torque arm), K-R combined, K-SZ. Motor power: 0.12–200 kW; ratios: 5.36–197.

Torque: up to 50,000 N·m Ratio: 5.36–197 Efficiency: 95–97% 90° output

Structural Types

K foot-mounted right-angle bevel gearmotor

K — Foot Mount

KF B5 flange bevel gearmotor

KF — B5 Flange

KA hollow shaft bevel gearmotor

KA — Hollow Bore

KAF flange hollow shaft bevel

KAF — Flange+Hollow

KAB compact hollow bevel

KAB — Compact

KAT torque arm bevel gearmotor

KAT — Torque Arm

K-R combined helical bevel reducer

K+R — Combined

K-SZ input shaft bevel gearbox no motor

K-SZ — Input Shaft

F Series Parallel Shaft Helical Gear Reducer
PARALLEL SHAFT

F Series — Parallel Shaft Helical Gear Reducer

Parallel input-output axes; ideal for tight-clearance horizontal conveyor drives; output torque to 30,000 N·m; 96–97% efficiency. Structural types: F, FF (flange), FA (hollow), FAF, FAT (torque arm), F-F combined, F-R combined, F-SZ. Motor power: 0.12–160 kW; ratios: 3.77–59.14.

Torque: up to 30,000 N·m Ratio: 3.77–59.14 Efficiency: 96–97% Parallel output

Structural Types

F standard parallel shaft helical gearmotor

F — Standard

FF flange parallel shaft helical gearmotor

FF — Flange

FA hollow shaft parallel shaft helical gearmotor

FA — Hollow Bore

FAF flange hollow shaft parallel shaft

FAF — Flange+Hollow

FAT torque arm parallel shaft helical gearmotor

FAT — Torque Arm

F-R combined parallel shaft helical reducer

F+R — Combined

F-SZ input shaft parallel shaft gearbox

F-SZ — Input Shaft

S Series Helical-Worm Gear Reducer
HELICAL-WORM

S Series — Helical-Worm Gear Reducer

Helical pre-stage combined with worm gear output for high reduction ratios and quiet right-angle drive; output torque to 3,500 N·m; 75–82% overall efficiency — notably higher than conventional worm-only reducers. Structural types: S, SF, SA, SAF, SAT, S-SZ. Motor power: 0.12–15 kW; ratios: 8.74–196.

Torque: up to 3,500 N·m Ratio: 8.74–196 Efficiency: 75–82% Self-locking option

Structural Types

S standard helical worm gearmotor

S — Standard

SF flange helical worm gearmotor

SF — Flange

SA hollow shaft helical worm gearmotor

SA — Hollow Bore

SAF flange hollow shaft helical worm gearmotor

SAF — Flange+Hollow

SAT torque arm helical worm gearmotor

SAT — Torque Arm

S-R combined helical worm reducer

S+R — Combined

S-SZ input shaft helical worm gearbox

S-SZ — Input Shaft

Which Series Is Right for Your Application?

Use the quick-reference table below to match your installation geometry, torque class, and efficiency requirement to the appropriate series. Our application engineers are available via the inquiry form for selection support at no charge.

SeriesOutput DirectionMax TorqueRatio RangeEfficiencyTypical Use Case
R SeriesCoaxial (inline)18,000 N·m1.3–28996–97%Conveyors, mixers, elevators
K SeriesRight-angle (bevel)50,000 N·m5.36–19795–97%Agitators, screw conveyors, packaging
F SeriesParallel offset30,000 N·m3.77–5996–97%Belt conveyors, logistics, roller tables
S SeriesRight-angle (worm)3,500 N·m8.74–19675–82%Food machinery, pharmacy, small conveyors

Why Engineers Choose Ever Power

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Precision Manufacturing

Case-hardened and ground gear sets, DIN 5–6 quality, single-datum housings machined to guarantee long-term alignment.

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Broad Configuration Range

Foot, flange, hollow-bore, torque-arm, combined, and input-shaft-only variants — most applications need no custom engineering.

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Global Export Ready

CE compliance, ISO 9001 quality system, IEC motor flange compatibility, and ATEX variants available for hazardous-area installations.

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Minimum order value USD 1,500; single-unit samples welcome. Standard configurations ship in 10–25 working days. EXW, FOB, CIF, DAP available.

Need a Gear Reducer for Your Production Line?

Send us your motor power, required output torque, speed ratio, and installation geometry — our engineers will recommend the right series and model, free of charge.