H3SH5-31.5-A parallel shaft helical reduction gearbox with pump

H series Parallel Shaft Helical Gearbox

Technical Parameters:

Available Models H1SH03~H4SH26
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.

High efficiency 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 Output: Solid shaft, Hollow shaft ( flat key, shrink disk, involute spline), Splined solid shaft, flanged shaft
  • 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 parallel shaft gearbox) 1.25~5.6
H2 (2 Stage parallel shaft gearbox) 6.3~28 B2 (2 Stage helical bevel gearbox) 5~18
H3 (3 Stage parallel shaft gearbox) 22.4~112 B3 (3 Stage helical bevel gearbox) 12.5~90
H4 (4 Stage parallel shaft gearbox) 100~450 B4 (4 Stage helical bevel gearbox) 80~400
Transmission stage Ratio(i) Models
H1 1.25 – 5.6 H1SH3, H1SH5, H1SH7, H1SH9, H1SH11, H1SH13, H1SH15, H1SH17, H1SH19
H2 6.3 – 28 H2SH4, H2SH5, H2SH6, H2SH7, H2SH8, H2SH9, H2SH10, H2SH11, H2SH12, H2SH13, H2SH14, H2SH15, H2SH16, H2SH17, H2SH18, H2SH19, H2SH20, H2SH21, H2SH22, H2SH23, H2SH24, H2SH25, H2SH26
H3 25 – 112

H3SH4, H3SH5, H3SH6, H3SH7, H3SH8, H3SH9, H3SH10, H3SH11, H3SH12, H3SH13, H3SH14, H3SH15, H3SH16, H3SH17, H3SH18, H3SH19, H3SH20, H3SH21, H3SH22, H3SH23, H3SH24, H3SH25, H3SH26

H4 90 – 450 H4SH5, H4SH6, H4SH7, H4SH8, H4SH9, H4SH10, H4SH11, H4SH12, H4SH13, H4SH14, H4SH15, H4SH16, H4SH17, H4SH18, H34H19, H4SH20, H4SH21, H4SH22, H4SH23, H4SH24, H4SH25, H4SH26

Type and Designation

HB FLENDER industrial gearbox type designation

Mounting Position

HB FLENDER industrial gearbox mounting position

Structure Drawing

HB series industrial gearbox structure drawing


Parallel shaft gear unit modular design


H3SH5-31.5-A parallel shaft helical reduction gearbox with OIL pump
H3SH5 Parallel Shaft Helical Reduction Gearbox
H3SH6 Parallel Shaft Helical Gearbox
H3SH6 Parallel Shaft Helical Reduction Gearbox
FLK H3SH12 Helical Reduction Gear Box
H3SH12 Helical Reduction GearBox


H series parallel shaft 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.

2 + 4 = ?