MI Series – Internal Thread Fixing Ball Transfer Units

MI Series Medium Duty Ball Transfer Units
MI Series Diagram Medium Duty Ball Transfer Units
Switch measurements:
Part Load (lb)Load (kg) Weight BALL ⌀ ″Ball Ø (mm) A B C D E F$ fromFile icon FilesAdd to Cart
MI12 55 25 0.110 0.050 1/2" 12 0.866 22 0.945 24 0.807 20.5 0.138 3.5 M8 x 1.25 M8 x 1.25 0.197 5 $51.09PDF Step
MI15 132 60 0.163 0.074 5/8" 15 0.945 24 1.102 28 0.906 23 0.197 5 M8 x 1.25 M8 x 1.25 0.315 8 $51.40PDF Step
MI22 397 180 0.560 0.254 7/8" 22 1.417 36 1.594 40.5 1.417 36 0.177 4.5 M8 x 1.25 M8 x 1.25 0.394 10 $57.72PDF Step
MI30 772 350 1.014 0.460 1 3/16" 30 1.772 45 1.843 46.8 1.528 38.8 0.256 6.5 M8 x 1.25 M8 x 1.25 0.394 10 $85.39PDF Step
MI45 1323 600 2.602 1.180 1 3/4" 45 2.441 62 2.500 63.5 1.988 50.5 0.354 9 M8 x 1.25 M8 x 1.25 0.394 10 $224.90PDF Step
MI76 2205 1000 13.362 6.060 3" 76.2 5.000 127 3.992 101.4 3.075 78.1 0.917 23.3 3.5" x 8 TPI NPSM 3.5" x 8 TPI NPSM 1.469 37.3 $309.10
MI12A 44 20 0.110 0.050 1/2" 12 0.866 22 0.945 24 0.807 20.5 0.138 3.5 M8 x 1.25 M8 x 1.25 0.197 5 $63.35PDF Step
MI15A 110 50 0.163 0.074 5/8" 15 0.945 24 1.102 28 0.906 23 0.197 5 M8 x 1.25 M8 x 1.25 0.315 8 $65.57PDF Step
MI22A 397 180 0.564 0.256 7/8" 22 1.417 36 1.594 40.5 1.417 36 0.177 4.5 M8 x 1.25 M8 x 1.25 0.394 10 $75.51PDF Step
MI30A 772 350 0.992 0.450 1 3/16" 30 1.772 45 1.843 46.8 1.528 38.8 0.256 6.5 M8 x 1.25 M8 x 1.25 0.394 10 $103.79PDF Step
MI45A 1323 600 2.580 1.170 1 3/4" 45 2.441 62 2.500 63.5 1.988 50.5 0.354 9 M8 x 1.25 M8 x 1.25 0.394 10 $311.88PDF Step
MI76A 2205 1000 13.340 6.050 3" 76.2 5.000 127 3.992 101.4 3.075 78.1 0.917 23.3 3.5" x 8 TPI NPSM 3.5" x 8 TPI NPSM 1.469 37.3 $954.28
MI12D 11 5 0.095 0.043 1/2" 12 0.866 22 0.945 24 0.807 20.5 0.138 3.5 M8 x 1.25 M8 x 1.25 0.197 5 $59.74PDF Step
MI15D 22 10 0.135 0.061 5/8" 15 0.945 24 1.102 28 0.906 23 0.197 5 M8 x 1.25 M8 x 1.25 0.315 8 $63.51PDF Step
MI22D 44 20 0.463 0.210 7/8" 22 1.417 36 1.594 40.5 1.417 36 0.177 4.5 M8 x 1.25 M8 x 1.25 0.394 10 $45.90PDF Step
MI30D 55 25 0.794 0.360 1 3/16" 30 1.772 45 1.843 46.8 1.528 38.8 0.256 6.5 M8 x 1.25 M8 x 1.25 0.394 10 $60.51PDF Step
MI45D 55 25 2.095 0.950 1 3/4" 45 2.441 62 2.500 63.5 1.988 50.5 0.354 9 M8 x 1.25 M8 x 1.25 0.394 10 $340.34PDF Step
MI76D 55 25 10.066 4.565 3" 76.2 5.000 127 3.992 101.4 3.075 78.1 0.917 23.3 3.5" x 8 TPI NPSM 3.5" x 8 TPI NPSM 1.469 37.3 $954.28
MI22SS Inquire Inquire Inquire Inquire 7/8" 22 1.417 36 1.594 40.5 1.417 36 0.177 4.5 M8 x 1.25 M8 x 1.25 0.394 10 -
MI30SS Inquire Inquire Inquire Inquire 1 3/16" 30 1.772 45 1.843 46.8 1.528 38.8 0.256 6.5 M8 x 1.25 M8 x 1.25 0.394 10 -
MI45SS Inquire Inquire Inquire Inquire 1 3/4" 45 2.441 62 2.500 63.5 1.988 50.5 0.354 9 M8 x 1.25 M8 x 1.25 0.394 10 -
MI76SS Inquire Inquire Inquire Inquire 3" 76.2 5.000 127 3.992 101.4 3.075 78.1 0.917 23.3 3.5" x 8 TPI NPSM 3.5" x 8 TPI NPSM 1.469 37.3 -

Our MI series medium duty range of ball transfer units are machined from solid steel & case hardened for wear resistance. Reinforced machined steel top cap protecting it against impact from any misalignment of conveyed items.

Lubricated for life & zinc plated for resistance to corrosion. Standard materials; Body & cap AISI 1015, Balls AISI 52100. Stainless steel upgrade ‘A’ & ‘SS’ feature AISI420 balls Shock Resistance & body. Main ball sizes ≥19mm incorporate a felt seal to restrict contamination.

This series features a single drain hole. M8 internal securing thread (female).

Low Friction Low Friction
1 : 0,002
Speed Speed
1.5m/sec
Temperature Temperature
-30/+100ºC
Shock Resistence Shock Resistence
Orientation Horizontal / Up

Orientation Horizontal / Up


K & C Type Clips

  • Fixing clips compensate for irregularities in bore and diameter.
  • Ideal where only single-sided access of mounting surface is reachable.
Medium Duty Part Bore Ø MIN - MAX A$ fromFile icon FilesAdd to Cart
MI12 K12 0.905 - 0.925 23 - 23.5 0.866 22 $3.57
MI15 K15 0.984 - 1.003 25.0 - 25.5 0.945 24 $2.09
MI15 C15 0.976 – 0.984 24.8 - 25.0 0.945 24 $3.31
MI22 K22 1.456 - 1.476 37 - 37.5 1.417 36 $2.45
MI22 C22 1.456 - 1.464 37 - 37.2 1.417 36 $3.79
MI30 K30 1.811 - 1.830 46 - 46.5 1.772 45 $3.41
MI30 C30 1.822 - 1.838 46.3 - 46.7 1.772 45 $5.17
MI45 K45 2.480 - 2.500 63 - 63.5 2.441 62 $4.79
clipping diagram
  1. Fit clip to mounting bore.
  2. Push ball unit though clip.
  3. Peripheral tags expand & grip the ball unit.
clip diagram
K-clip Spring Steel
clip diagram
C-clip Spring Steel
clip diagram
Other clips available.

Tolerance Rings

  • Compensate for irregularities in bore & diameter.
  • Ideal where only single-sided access of mounting surface is reachable.
Medium Duty Part A Bore Ø MIN / MAX B$ fromFile icon FilesAdd to Cart
MI12 TR20 0.787 20 0.858 - 0.868 21.8 - 22.05 0.472 12 $1.61
MI15 TR24 0.945 24 1.010 - 1.020 25.65 - 25.9 0.591 15 $1.80
MI22 TR36 1.417 36 1.488 - 1.496 37.8 - 38 0.472 12 $3.14
MI30 TR45 1.772 45 1.843 - 1.850 46.8 - 47 0.591 15 $3.27
TR60 2.362 60 2.445 - 2.453 62.1 - 62.3 0.787 20 $3.62
transfer ball unit tolerance ring

Similar Heavy Duty models:

  • Maximum capacity at any angles of orientation.
  • Heavy duty precision machined construction.
  • “Endless track” design – smoothest precision.
  • Service kits & factory spares since 1954.
2 year warranty logo
Subject to usage & conditions.

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