The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X50-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X50-20S is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that lets you fine-tune the stroke end by up to 20 mm without removing the unit. Its 50 mm bore delivers 982 N of push force at 0.5 MPa (1767 N at the 0.9 MPa maximum operating pressure), making it a solid mid-range actuator for tasks that need a precise, repeatable end position.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for non-contact position sensing. The 20 mm rod, PT1/4 ports, and 21 mm air cushion help it run quietly at speeds from 30 to 800 mm/s, with a body length of 194 mm (A dimension).
| Model | Airtac SCJ50 Standard Cylinder SCJ50X50-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 20 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Dial in the exact stroke end during machine setup with the 20 mm rear screw, eliminating the need to shim or reposition the cylinder body on packaging or assembly fixtures.
On clamping or pressing stations, the adjustable stroke compensates for tooling wear over time. A quick turn of the screw restores full contact force without replacing parts.
When a line switches product sizes, the SCJ50X50-20S lets operators reset the push stroke in seconds. The built-in magnet confirms the new end position via a barrel-mounted sensor.
Choose the SCJ50 when the 40 mm bore’s 628 N push is too light but the 63 mm bore’s 1559 N is overkill for your load. If your application never needs stroke adjustment, the fixed-stroke SC50 is a simpler, lower-cost alternative. For a direct replacement, match the 50 mm bore, 50 mm nominal stroke, 20 mm adjust range, PT port thread, basic mounting, and the -S magnet option.
At this 50 mm stroke, rod bending from side loads is rarely a concern, but always centre the load on the rod axis. If the cylinder must push an off-centre weight, add an external guide rail or switch to a guided cylinder to protect the rod bearing.
Adjustable-stroke checklist
At 0.5 MPa it generates 982 N pushing and 825 N pulling (the pull force is lower because the 20 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N.
Yes, if the original is an AirTAC SCJ50 with a 50 mm nominal stroke, 20 mm adjust range, PT ports, basic mounting, and a magnet. The -S suffix is essential for sensor compatibility; without it, reed switches cannot detect piston position.
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