A linear bearing, also known as a linear ball bush or bushing, is a bearing that runs on a hardened linear shaft to help guide or support the movement of a component in a linear fashion. A cost effective method of achieving linear motion where the loads are light enough to not need conventional linear guides or where the guide can only be supported at the ends and not over the entire length.
As specialists in linear motion systems we offer you a choice of materials and sizes. So whether you need lightweight aluminium rails for use in aviation applications or stainless steel components for when exposure to water or corrosive chemicals is a factor, our knowledgable technical engineers are always on hand to provide assistance.
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Long, circular flanged linear ball bushings - 6mm to 60mm. Double complement bearings.
For use with hardened shafts only, steel ball retainers can be supplied for higher temperature applications up to 120 ℃.
Our linear bushing systems are designed to have full interchangeability, with other manufacturers’ parts. For shafting see part numbers L1770 to L1785.
The single body retainer guides 4-6 ball circuits. It precisely guides the balls with a smooth motion.
Normal fit is standard, pressed fit is for without clearance.
|Part no.||Normal fit||Pressed fit|
|L1706 to L1733||H7||K6, J6|
|L1706...-1 to L1733...-1||H7||J7|
The hardened and precisely ground outer sleeve is made of bearing steel.
Consists of light aluminium case and L1706 type linear bushing, so the installation can be finished simply by bolting. Longer life can be obtained by adjusting the orientation of the ball circuits in the linear carriage element against the direction of load.
Tolerance of shaft
|Part no.||Normal fit||Tight fit|
|L1706 to L1733||h6||k6|
|L1706...-1 to L1733...-1||f6, g6||h6|
The basic dynamic load rating is defined as the constant load both in direction and magnitude under which a group of identical linear bushings are individually operated. 90% of the units can travel 50Km without failing due to rolling contact fatigue.
If a linear bushing is subject to an excessive load or impact, a permanent deformation occurs between the raceway and the rolling element. The basic static load rating is defined as the static load that gives a prescribed constant contact stress at the centre of the contact area between the rolling element and raceway receiving the maximum load.
Superball linear ball bushings
Higher load ratings
The uniquely designed ball plate (in the outside diameter of the bushing), is made of hardened steel. The precision ground groove is slightly larger than the ball size, which provides greater contact area between the balls and the ball plate, and as a result, provides 3 x higher load ratings of conventional linear bushings.
The ball plate has a convex shape to provide a pivot point at the centre which allows self-alignment up to ±0.5°. This self-alignment capability eliminates any possibility of edge pressure caused by inaccurate machining, errors on mounting, or shaft deflection.
Tolerance of shaft and housing bore
|Part no.||Shaft Ø d1||Tol. h6 μ||Housing bore Ø d2||Tol. H7 μ|
|L1740.010||10||+0 to - 9||19||+21 to -0|
|L1740.012||12||+0 to - 11||22||+21 to -0|
|L1740.016||16||+0 to - 11||26||+21 to -0|
|L1740.020||20||+0 to - 13||32||+25 to -0|
|L1740.025||25||+0 to - 13||40||+25 to -0|
|L1740.030||30||+0 to - 13||47||+25 to -0|
|L1740.040||40||+0 to - 16||62||+30 to -0|
|L1740.050||50||+0 to - 16||75||+30 to -0|