Cilindru pneumatic standard SMC CUJB8-6DM

The SMC CUJ series mini pneumatic cylinders cover seven bores, from ø4 to ø20 mm. Their compact body reduces length and volume compared with the CQS and CU cylinders, with strokes available from 4 to 50 mm depending on the model.

Features:
The CUJ series brings together free-body mini cylinders, available in seven bores from ø4 to ø20 mm. The body concentrates the wiring and pneumatic connection on one side for bores ø4 to ø10, allowing installation from four directions. Bores ø12 to ø20 have a counterbored body for mounting without screw protrusion, in side or axial version. Two position sensors can be fitted from a stroke of 4 mm on the small bores and 5 mm on bores ø12 to ø20. Seal replacement is carried out by removing the rod cover on bores ø4 to ø10, or the retaining ring on bores ø12 to ø20. A cleanroom-compatible version, with vacuum or exhaust port, completes the range except for bore ø4. Short-pitch mounting remains possible to bring several cylinders closer together, and lowering the centre of gravity makes use with an external guide easier.

The designation distinguishes versions without magnet, not detectable by a magnetic sensor, from versions with integrated magnet, identified by the CDUJ prefix and detectable. The body is available in side mounting, marked by the letter B, or axial mounting, marked by the letter S (only on models of ø12 mm and above). After the piston diameter and the stroke expressed in millimetres, the letter D indicates double-acting and the letter S single-acting with spring return. The presence of an M at the end of the reference indicates a male threaded piston rod; if it is absent, the rod bore remains female tapped, except on bore ø4 which does not offer threading.

Specifications:
- Available bores: ø4, ø6, ø8, ø10, ø12, ø16, ø20 mm.
- Action: double-acting or single-acting with spring return depending on reference.
- Fluid: air.
- Proof pressure: 1.05 MPa.
- Maximum operating pressure: 0.7 MPa.
- Minimum operating pressure, double-acting: 0.15 MPa (ø4 and ø6), 0.1 MPa (ø8 and ø10), 0.07 MPa (ø12), 0.05 MPa (ø16 and ø20).
- Minimum operating pressure, single-acting: 0.35 MPa (ø4), 0.3 MPa (ø6), 0.2 MPa (ø8 and ø10), 0.25 MPa (ø12), 0.18 MPa (ø16 and ø20).
- Ambient and fluid temperature: from -10 °C to 70 °C without sensor, from -10 °C to 60 °C with sensor, non-freezing.
- Cushioning: none on bores ø4 to ø10, rubber bumper on bores ø12 to ø20.
- Lubrication: non-lubricated, no greasing maintenance.
- Piston speed: from 50 to 500 mm/s, from 50 to 400 mm/s on the cleanroom-compatible version.
- Stroke tolerance: +0.5/0 mm on bores ø4 to ø10, +1.0/0 mm on bores ø12 to ø20.
- Mounting: through-hole on the whole range.
- Standard strokes: from 4 to 30 mm on bores ø4 to ø10, from 5 to 50 mm on bores ø12 to ø20.
- Optional male rod thread: from M2 x 0.4 (ø4) to M8 x 1.25 (ø20) depending on bore.
- Port threads: M3 x 0.5 on bores ø4 to ø16, M5 x 0.8 on bore ø20.
- Mass, double-acting: from 7.2 g (ø4, 4 mm stroke) to 142 g (ø20, 50 mm stroke) depending on bore and stroke.
- Theoretical output force, double-acting, pressure from 0.3 to 0.7 MPa: from 2.82 N to 220 N depending on bore, direction and pressure.
- Main materials: body in hard anodised aluminium alloy, piston and rod in stainless steel or aluminium alloy depending on the bore, seals in NBR, with fluororubber as an option on bores ø4 to ø10.
- Reduced footprint: length reduced by up to 20 % and volume by up to 45 % compared with the CQS series with magnet; length reduced by up to 64 % and volume by up to 70 % compared with the CU series without magnet.

Standards:
- RoHS: this European directive limits the use of hazardous substances such as lead, mercury or certain flame retardants in electrical and electronic equipment. Compliance of the range facilitates its integration into equipment subject to this regulation.

Bore (mm): 4, 6, 8, 10, 12, 16, 20 Stroke length up to 50 mm Suitable for proximity switches Multiple mounting surfaces.