Low-speed synchronous motors provide highly precise speed regulation, low-speed rotation, and quick bi-directional rotation. The basic construction of low-speed synchronous motors is the same as that of stepper motors.

  • 3.35 in. (85 mm) / 3.54 in. (90 mm) Frame Size
  • Single-Phase 100/115 VAC
  • Holding Torque
    • Round Shaft = 5.1 ~ 12.6 oz-in (36 ~ 89 mN·m)
    • Parallel Shaft Gear = 12.3 ~ 88 lb-in (1.4 ~ 10 N·m)
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Shaft/Gear Type

  • Parallel Shaft Gearhead
  • Round Shaft (No Gearhead)

Gear Ratio (X:1) (:1)

  • 3
  • 3.6
  • 5
  • 6
  • 7.5
  • 9
  • 12.5
  • 15
  • 18
  • 25
  • 30
  • 36
  • 50
  • 60
  • 75
  • 90
  • 100
  • 120
  • 150
  • 180

Item #

Frame Size

Power Supply

Shaft/Gear Type

Gear Ratio (X:1)

Output Shaft Diameter

Rated Torque

Rated Speed (rpm)

Web Price

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SMK5100A-AA - 3.35 in85 mm - Single-Phase 100-115 VAC - Round Shaft (No Gearhead) - - 1/2 in. - 8.875 lb-in [50 Hz]  9.75 lb-in [60 Hz]  1 N·m [50 Hz]  1.1 N·m [60 Hz]   - 60 [50 Hz] 72 [60 Hz] $164.00 Add To Cart
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SMK5160A-AA - 3.35 in85 mm - Single-Phase 100-115 VAC - Round Shaft (No Gearhead) - - 1/2 in. - 13.75 lb-in [50 Hz]  18.125 lb-in [60 Hz]  1.6 N·m [50 Hz]  2.1 N·m [60 Hz]   - 60 [50 Hz] 72 [60 Hz] $239.00 Add To Cart
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SMK550A-GN / 5GN3SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 3 :1 - 1/2 in. - 12.3 lb-in  1.4 N·m   - 20 [50 Hz] 24 [60 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN3.6SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 3.6 :1 - 1/2 in. - 15 lb-in  1.7 N·m   - 16.67 [50 Hz] 20 [60 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN5SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 5 :1 - 1/2 in. - 20 lb-in  2.3 N·m   - 14.4 [60 Hz] 12 [50 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN6SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 6 :1 - 1/2 in. - 24 lb-in  2.8 N·m   - 10 [50 Hz] 12 [60 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN7.5SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 7.5 :1 - 1/2 in. - 30 lb-in  3.5 N·m   - 9.6 [60 Hz] 8 [50 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN9SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 9 :1 - 1/2 in. - 38 lb-in  4.3 N·m   - 8 [60 Hz] 6.67 [50 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN12.5SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 12.5 :1 - 1/2 in. - 39 lb-in  4.5 N·m   - 5.76 [60 Hz] 4.8 [50 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN15SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 15 :1 - 1/2 in. - 44 lb-in  5 N·m   - 4.8 [60 Hz] 4 [50 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN18SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 18 :1 - 1/2 in. - 53 lb-in  6 N·m   - 4 [60 Hz] 3.33 [50 Hz] $266.00 Add To Cart
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SMK550A-GN / 5GN25SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 25 :1 - 1/2 in. - 66 lb-in  7.5 N·m   - 2.88 [60 Hz] 2.4 [50 Hz] $276.00 Add To Cart
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SMK550A-GN / 5GN30SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 30 :1 - 1/2 in. - 79 lb-in  9 N·m   - 2.4 [60 Hz] 2 [50 Hz] $276.00 Add To Cart
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SMK550A-GN / 5GN36SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 36 :1 - 1/2 in. - 79 lb-in  9 N·m   - 2 [60 Hz] 1.67 [50 Hz] $276.00 Add To Cart
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SMK550A-GN / 5GN50SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 50 :1 - 1/2 in. - 88 lb-in  10 N·m   - 1.44 [60 Hz] 1.2 [50 Hz] $287.00 Add To Cart
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SMK550A-GN / 5GN60SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 60 :1 - 1/2 in. - 88 lb-in  10 N·m   - 1.2 [60 Hz] 1 [50 Hz] $287.00 Add To Cart
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SMK550A-GN / 5GN75SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 75 :1 - 1/2 in. - 88 lb-in  10 N·m   - 0.96 [60 Hz] 0.8 [50 Hz] $287.00 Add To Cart
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SMK550A-GN / 5GN90SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 90 :1 - 1/2 in. - 88 lb-in  10 N·m   - 0.8 [60 Hz] 0.67 [50 Hz] $287.00 Add To Cart
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SMK550A-GN / 5GN100SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 100 :1 - 1/2 in. - 88 lb-in  10 N·m   - 0.72 [60 Hz] 0.6 [50 Hz] $287.00 Add To Cart
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SMK550A-GN / 5GN120SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 120 :1 - 1/2 in. - 88 lb-in  10 N·m   - 0.6 [60 Hz] 0.5 [50 Hz] $287.00 Add To Cart
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SMK550A-GN / 5GN150SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 150 :1 - 1/2 in. - 88 lb-in  10 N·m   - 0.48 [60 Hz] 0.4 [50 Hz] $287.00 Add To Cart
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SMK550A-GN / 5GN180SA - 3.54 in90 mm - Single-Phase 100-115 VAC - Parallel Shaft Gearhead - 180 :1 - 1/2 in. - 88 lb-in  10 N·m   - 0.4 [60 Hz] 0.33 [50 Hz] $287.00 Add To Cart
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