The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X185-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø50mm bore, 185mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X185-30S is a double-acting, single-rod pneumatic cylinder with a 50 mm bore and a nominal 185 mm stroke, field-adjustable by up to 30 mm via a rear-cap screw. This allows precise stroke-end tuning without removing the cylinder, ideal for commissioning and format changes. It delivers 982 N of push force at 0.5 MPa and features a 20 mm diameter piston rod with M16x1.5 threads.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The standard TPU seal operates from -20 to +70 °C, and the PT1/4 ports provide straightforward pneumatic connection.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X185-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 185 mm |
| Stroke adjustment | Up to 30 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×185 | Nominal (maximum) stroke length in mm. |
| -30 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Fine-tune the end position of a material stop or pusher during initial machine setup. The 30 mm adjustment range lets technicians dial in the exact stroke without swapping cylinders or fabricating custom hard stops.
Quickly adapt a diverter gate's throw distance on a packaging line for different box sizes. Operators can adjust the stroke end in minutes, minimizing downtime between production runs.
In a clamping fixture, use the adjustable screw to take up mechanical wear on contact pads over time. This maintains consistent clamping force and position without reprogramming or replacing parts.
With 982 N of push force at 0.5 MPa, this 50 mm bore cylinder suits medium clamping and positioning tasks. If your force requirement is lower, the 40 mm bore SCJ40 series provides 628 N of push at the same pressure. For higher force needs, step up to the 63 mm bore SCJ63, which delivers 1559 N. This adjustable-stroke SCJ is the right choice when you need on-machine stroke tuning; if your stroke is fixed, a standard SC cylinder is a simpler, more economical alternative.
For replacement, match this unit with another AirTAC SCJ50X185-30S, ensuring the same 50 mm bore, 185 mm nominal stroke, 30 mm adjustment range, PT ports, and built-in magnet. At 185 mm, the stroke is moderate, but for any application with significant side loading, an external guide rail or a guided cylinder is recommended to protect the rod and bearings.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at 0.9 MPa is 1767 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
Yes, the SCJ50X185-30S can directly replace an SC50X185 in many applications, provided the extra body length for the adjusting mechanism is accommodated. The mounting, port size (PT1/4), and rod thread (M16x1.5) are identical. The key advantage is gaining 0-30 mm of on-machine stroke adjustment.
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