Ball knob for opening

The ball knobs GN 319.1 do not require a thread at the shaft. During mounting, easy blows with a soft hammer are sufficient to drive the knob into place, the shaft end should be slightly rounded or chamfered (30°). The bore is conical which guarantees a firm press on operation. The elastical polyamide bushing shows a good holding force even with a shaft tolerance of h11, the knobs are resistant to vibrations and may be re-assembled any time.