Description:
Ball knobs smooth, DIN 319 enhanced.

Material:
- Thermoset PF 31, black or red.
- Bush: Electro zinc-plated steel.

Version:
- High-gloss polished.

Assembly:
- Form L is installed by tapping lightly with a hammer.
- Use only a rubber or plastic hammer with a maximum weight of 200 g.

Shank Tolerance:
- Ball knobs with press-fit sleeve can be mounted on standard shafts with tolerance h9.
- The supplied press-fit sleeve assures a firm and reliable fit.

Catalogue Note:
- The catalogue also notes special bush materials for legacy referenced versions: B0307.21604 has a brass bush; B0307.23008, B0307.230081, B0307.23508 and B0307.24008 have copper-plated steel bushes.

Drawing Reference:
- Form C: Moulded thread.
- Form E: Tapped bush.
- Form L: Press-fit sleeve.
- Form M: Tapered hole.

Variant:
- Form: L - clamping sleeve / press-fit sleeve
- Main colour: Black

Dimensions / Technical Data:
- D: 12 mm
- D1: 50 mm
- D6: 28 mm
- H: 48 mm
- T: 20 mm