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  • October 29, 2026

Installation method for industrial motors B3, B5, B14, B35, B34 three-phase asynchronous motors

Installation method for industrial motors B3, B5, B14, B35, B34 three-phase asynchronous motors

horizontal helical gear motor

The five most common configurations B3, B5, B14, B35, and B34 have been subdivided to help you choose the appropriate configuration for your machine.

Overview of five common installation configurations for industrial motors：

Mounting CodeInstallation TypeKey FeaturesTypical Applications
B3
Horizontal Foot MountUses feet/bracket; no flangePumps, conveyors, gearboxes
B5Vertical Flange (Large)Large flange, 4 mounting holesVertical pumps, agitators, fans
B14Vertical Flange (Small)Small flange, 4 threaded holesSmall gearboxes, compact machinery
B34Dual (Foot + Small Flange)Both feet and small flangeSpace-saving setups with dual mounting
B35Dual (Foot + Large Flange)Both feet and large flangeHigh-vibration equipment, heavy loads

Detailed breakdown of installation methods for each type of AC asynchronous motor and deceleration motor:

1. B3 Horizontal Foot Mount

The B3 is the most common and traditional mounting style. The motor is equipped with cast-iron feet at the bottom, allowing it to be bolted directly to a horizontal base or foundation.

  • Advantages: Excellent stability, easy to align with shims, and highly versatile.

  • Best for: Standard industrial machinery, gear reducers, and floor-mounted pump systems.

2. B5 Vertical Flange Mount (Large Flange)

The B5 configuration features a large, round flange at the drive end with four through-holes for bolting. It is designed to be mounted vertically onto a flat surface (often referred to as FF flange).

  • Advantages: Saves floor space, ensures perfect alignment with the driven shaft, and allows for direct coupling.

  • Best for: Vertical pumps, mixers, and cooling tower fans.

3. B14 Vertical Flange Mount (Small Flange)

Similar to the B5, the B14 uses a flange, but it is significantly smaller and features threaded mounting holes (often referred to as FT flange).

  • Advantages: Compact design, ideal for tight spaces where a large flange cannot fit.

  • Best for: Small gearboxes, compact machine tools, and light-duty automation equipment.

4. B35 Dual Mount (Foot + Large Flange)

The B35 combines the B3 and B5 styles. It features both standard horizontal feet and a large vertical flange.

  • Advantages: Offers maximum mounting flexibility. The feet can support the motor's weight while the flange ensures precise alignment.

  • Best for: High-vibration environments, heavy-duty agitators, or modifications where operators need multiple mounting options.

5. B34 Dual Mount (Foot + Small Flange)

The B34 is the hybrid of the B3 and B14 styles. It features horizontal feet paired with a small threaded flange.

  • Advantages: Provides the dual security of feet and a compact flange.

  • Best for: Space-constrained applications that still require the structural support and stability of foot mounting.

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