H1HH H2HH H3HH H4HH Parallel shaft helical Gearbox

H1HH H2HH H3HH H4HH Parallel Shaft Helical Industrial Gearbox

Technical Parameters:

Available Models H1HH03~H4HH26
Ratio 1.25~450
Input power 5.5~4400 kW
Max torque 2.9~900 kN.m


H Series industrial helical parallel shaft gear units are high-quality gearboxes for heavy-duty industrial applications. All mechanical parts are analyzed with state-of-the-art software to guarantee their reliability. We also offers tailored solutions for specific applications.

H series helical parallel shaft industrial gearboxes have been introduced to meet the requirements of today’s demanding applications in the medium and heavy-duty sector of the power transmission market. The purpose of using the parallel shaft gearbox is to reduce the speed and increase the torque. It is suitable for high-speed axle speed not more than 1500 rpm, gear drive circumferential speed not more than 20 m/s, working environment temperature is -40℃~+45℃. The gearboxes are compact, totally enclosed and are designed for direct mounting to ensure highest precision positive drive and permanent alignment minimizing space requirement and layout problems. H series parallel shaft helical gearbox offers unlimited installation flexibility.


  • Adopt optimized modular design.
  • Parallel shaft output form.
  • The transmission torque distribution curve is excellent, suitable for heavy load conditions.
  • It adopts advanced grinding technology and shape modification technology, which has high bearing capacity, reliable operation and low noise.
  • The box body is made of high-quality casting to improve the mechanical strength and seismic performance of the reducer.
  • Numerous mounting options are available.

Product Form

  • Transmission Stage: single stage, 2 stage, 3 stage, 4 stage.
  • Mounting: Horizontal mounted, Vertical mounted
  • Parallel Input: shaft with key-way, IEC flange;
  • Parallel Output: Solid shaft, Hollow shaft ( flat key, shrink disk, involute spline), Splined solid shaft, flanged shaft
  • Shaft arrangment: A,B,C,D (detailed please check FLK drive parallel shaft helical industrial gearbox catalogue)
  • Configuration options: With auxiliary tank, with oil pump, with cooling fan, with backstop, with hydraulic coupling, with gear unit swing-base

Technical Data

  • Size: H1SH03~H4SH26
  • Technical Data(kN·m): 2.9~900
  • Gear Ratio: 1.25~450
  • Input Power(kW):5.5~4400
  • Housing material: HT250 high-strength cast iron
  • Housing hardness: HBS190-240
  • Gear material: 20CrMnTi alloy steel, other materials requested: 17CrNi2Mo, 20CrNi4A
  • Surface hardness of gears: HRC58-62
  • Gear core hardness: HRC33-40
  • Input / Output shaft material: 42CrMo alloy steel
  • Input / Output shaft hardness: HRC25-30
  • Heat treatment: tempering,cementiting,quenching.etc.
  • Machining precision of gears: accurate grinding, 6-5 Grade
  • Noise (MAX): 60~68dB
  • Lubricating oil: GB L-CKC220-460, Shell Omala220-460
  • Temp. rise (MAX): 40°C
  • Efficiency: 94%~96% (depends on the transmission stage)
  • Temp. rise (Oil)(MAX): 50°C
  • Backlash: ≤20Arcmin
  • Vibration: ≤20µm

Available Models

H Series Ratio B Series Ratio
H1 (1 Stage) 1.25~5.6
H2 (2 Stage) 6.3~28 B2 (2 Stage) 5~18
H3 (3 Stage) 22.4~112 B3 (3 Stage) 12.5~90
H4 (4 Stage) 100~450 B4 (4 Stage) 80~400
Transmission stage Ratio (i) Models
H1 1.25 – 5.6

H1HH3, H1HH5, H1HH7,  H1HH11, H1HH13, H1HH15, H1HH17, H1HH19

H2 6.3 – 28

H2HH4, H2HH5, H2HH6, H2HH7, H2HH8, H2HH9, H2HH10, H2HH11, H2HH12, H2HH13, H2HH14, H2HH15, H2HH16, H2HH17, H2HH18, H2HH19, H2HH20, H2HH21, H2HH22, H2HH23, H2HH24, H2HH25, H2HH26

H3 25 – 112

H3HH5, H3HH6, H3HH7, H3HH8, H3HH9, H3HH10, H3HH11, H3HH12, H3HH13, H3HH14, H3HH15, H3HH16, H3HH17, H3HH18, H3HH19, H3HH20, H3HH21, H3HH22, H3HH23, H3HH24, H3HH25, H3HH26

H4 90 – 450 H4HH7, H4HH8, H4HH9, H4HH10, H4HH11, H4HH12, H4HH13, H4HH14, H4HH15, H4HH16, H4HH17, H4HH18, H4HH19, H4HH20, H4HH21, H4HH22, H4HH23, H4HH24, H4HH25, H4HH26

Type and Designation

HB FLENDER industrial gearbox type designation

Mounting Position (industrial gearbox)

HB FLENDER industrial gearbox mounting position

Structure Drawing

HB series industrial gearbox structure drawing


Parallel shaft gear unit modular design


H3HV12 Parallel Shaft Helical Gear Box
H3SH6 Parallel Shaft Helical Gearbox
FLK H3SH12 Helical Reduction Gear Box


H series parallel shaft industrial gearboxes are widely used in light industry, food, beer and beverage, chemical industry, escalators, automatic storage equipment, construction, machinery, iron and steel metallurgy, paper-making, wood-based panel machinery, automobile manufacturing, tobacco machinery, water conservancy, printing and packaging, pharmaceutical, textile, building materials, logistics, feed machinery, environmental protection and other fields.

For any information, inquiries or questions, please do not hesitate to contact us. FLK drive is always at your service.

1 + 3 = ?