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    SDM25GA 25mm Linear Ball Bushing

    This precision linear motion ball bearing has a 25mm bore with metric outer diameter 40mm and length 50mm. Compact design and point contact arrangement provide the most cost-effective combination of optimum loading capacity, low friction, quiet operation, accuracy, repeatability and long life. Open types are available as well.
    This product has a minimum quantity of 5
    Delivery date: 6-12 days

    Linear ball bushings with 25mm bore size and 6 ball circuits are for sale. They are constructed hardened steel outer housings, resin cages, steel races and chrome steel balls, delivering remarkable sturdiness and accuracy.


    SDM type dimension

    Nominal shaft diameter Resin retainer Major dimensions and tolerance
    SDM Ball circuit Weight SDM...AJ Ball circuit Weight SDM...OP Ball circuit Weight dr Tolerance
    Precision High
    16mm SDM16GM 4 76g LM16UU-AJ 4 75g SDM16OP 3 58g 16mm 0
    20mm SDM20GM 5 100g LM20UU-AJ 5 98g SDM20OP 4 79g 20mm 0
    25mm SDM25GM 6 240g LM25UU-AJ 6 237g SDM25OP 5 203g 25mm
    30mm SDM30GM 6 270g LM30UU-AJ 6 262g SDM30OP 5 228g 30mm
    35mm SDM35GM 6 425g LM35UU-AJ 6 420g SDM35OP 5 355g 35mm 0
    40mm SDM40GM 6 654g LM40UU-AJ 6 640g SDM40OP 5 546g 40mm
    50mm SDM50GM 6 1700g LM50UU-AJ 6 1680g SDM50OP 5 1420g 50mm
    60mm SDM60GM 6 2000g LM60UU-AJ 6 1980g SDM60OP 5 1650g 60mm 0
    80mm SDM80GM 6 4520g LM80UU-AJ 6 4400g SDM80OP 5 3750g 80mm
    100mm SDM100GM 6 8600g LM100UU-AJ 6 8540g SDM100OP 5 7200g 100mm 0


    Major dimensions and tolerance Eccentricity Radial clearance (Max) Basic load rating
    D L B W D1 h h1 θ
    mm Tolerance mm Tolerance mm Tolerance Precision High Dynamic  Static
    28 0
    37 0
    26.5 0
    1.6mm 27mm 1.5mm 11mm 80° 8μm 12μm -6μm 774c N 1180co N
    32 0
    42 30.5 1.6mm 30.5mm 1.5mm 11mm 60° 10μm 15μm 882cN 1370co N
    40 59 0
    41 0
    1.85mm 38mm 2mm 12mm 50° 980c N 1570co N
    45 64 44.5 1.85mm 43mm 2.5mm 15mm 50° -8μm 1570c N 2740co N
    52 0
    70 49.5 2.1mm 49mm 2.5mm 17mm 50° 12μm 20μm 1670c N 3140co N
    60 80 60.5 2.1mm 57mm 3mm 20mm 50° -10μm 2160c N 4020co N
    80 100 74 2.6mm 76.5mm 3mm 25mm 50° -13μm 3820c N 7940co N
    90 0
    110 85 3.15mm 86.5mm 3mm 30mm 50° 17μm 25μm 4700c N 10000co N
    120 140 0
    105.5 0
    4.15mm 116mm 3mm 40mm 50° -20μm 7350c N 16000co N
    150 0
    175 125.5 4.15mm 145mm 3mm 50mm 50° 20μm 30μm 14100c N 34800co N

    Tips: Advantanges of Ball Bearings and When to Use Them

    Whether in industrial equipment or household appliances, bearings are designed for allowing smooth movement between separate components, of which there are mainly two types: roller bearings and ball bearings. What are the differences between both of them? When should we use one rather than the other?

    What is a ball bearing?

    A ball bearing carry hardened steel balls along inner and outer raceways. When a load is applied, the ball bearing creates rotation by transfering the load from the inner raceway to the outer raceway. One of the main features of a ball bearing is its point contact between the ball and the shaft, although very small deformations can expand thie very small contact area.


    1. Low friction

    Having a small area of contact means that ball bearings produce much less friction resulted from the motion of inner and outer raraceways, thus components are in a smooth rotation. For this reason, ball bearings are preferred in applications where speed and easy operations are required.

    2. Able to handle radial and thrust loads

     Another unique characteristic of a ball bearing is that it can rotate on more than one axis. This means that it can react to loads applied from different directions, including radial and thrust loads. The extra versatility makes it a wonderful choice for equipment that aren't used according to strict standards.

    When should you use ball bearings?

    • When you need more flexible movement
      Ball bearings are designed to rotate when either a radial or thrust is applied on them. Thus the ball bearing is typically used for devices where the input is variable, such as those that are designed for human use.
    • When lighter loads are preferred in designing equipment
      The point contact that features in ball bearings has its pros and cons among which the major ones are reduced friction and concentrated load. This means they are suitable for lighter loads otherwise they tend to fail more likely. Do limit the load to the specified range prescribed by the manufacturer. 
    • When greater speeds are required in operation
      As is said, the major benefit of the small contact area of ball bearings is that they generate minimal friction, allowing them to operate at high speeds. Lower friction means less wear and tear between the rotating spherical elements, delivering impressive durability.
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