The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X275-20 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X275-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. At 0.5 MPa it delivers 982 N push and 825 N pull, making it a capable mid-bore actuator for tasks that need precise mechanical end-stop tuning without swapping the cylinder.
This 50 mm bore unit uses a 20 mm diameter piston rod, PT1/4 ports, and M16x1.5 rod threads. The integral air cushion (21 mm length) decelerates the piston smoothly, and the tie-rod construction keeps service straightforward. The body length A(SCJ) is 194 mm plus the 275 mm nominal stroke.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X275-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 275 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. |
| ×275 | 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.
The 20 mm adjuster lets technicians dial in the exact stroke end on a new machine without cutting brackets or adding external hard stops, speeding up factory acceptance tests.
On packaging lines handling multiple box sizes, the adjustable stroke quickly resets the pusher end position, reducing changeover time between product runs.
In clamping or pressing fixtures where tooling surfaces wear over time, the rear screw can be advanced to take up the resulting slack and maintain consistent contact force.
Choose the SCJ50X275-20 when you need to dial in a stroke end position during commissioning or after tooling wear. If 982 N push is marginal, stepping up to a 63 mm bore provides 1559 N push at the same pressure; if space or force is over-specified, the 40 mm bore delivers 628 N push. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative. When the 275 mm stroke creates a risk of side-loading or rod buckling, add an external guide rail or switch to a guided cylinder assembly.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, push force is 982 N and pull force is 825 N. At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
It can replace another AirTAC SCJ50 cylinder with a 275 mm nominal stroke and 20 mm adjust range, matching PT ports and basic mounting. It is not a direct dimensional swap for an ISO 15552 cylinder or a fixed-stroke SC model, as the SCJ body is longer to house the adjusting mechanism.
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