The guide bushings are made of (spring hardened) steel. The borehole has a plastic slide coating. The outside diameter is configured to ISO tolerance h5, the borehole is machined to ISO tolerance G6. The maximum borehole / outside diameter / end face run-out is 0.01mm.
The plastic coating has a high-level of wear resistance and good emergency running properties, however, it may not be used without a lubricant. Suitable for this purpose are normal petroleum-based lubricants in accordance with DIN 51502 and 51517 (circulation lubricants and gliding oils).
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