The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X135-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 135mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X135-50 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 50 mm field-adjustable stroke end. Operating at 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, driven by a 20 mm diameter piston rod through PT1/4 ports. This adjustable-stroke design allows machine builders to fine-tune the end position without swapping the cylinder, making it ideal for commissioning trials and format changeovers.
With a 135 mm nominal stroke and a 28 mm air cushion, this SCJ model decelerates the piston smoothly near the stroke end, protecting end caps. The body length A is 197 mm, and the cylinder is rated for standard operating pressures from 0.15 to 1.0 MPa. It uses the default TPU seal for a temperature range of -20 to +70 °C and comes with PT threads in a basic mounting configuration, ready to accept the SCJ subset of mounting accessories.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X135-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 135 mm |
| Stroke adjustment | Up to 50 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×135 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm rear adjustment screw lets technicians precisely dial in the actuator end-stop during initial machine setup without changing hard stops or linkages.
Quickly adjust the stroke end for different product sizes on packaging or sorting lines, reducing downtime between production runs with a simple screw turn.
As tooling or gripper pads wear over time, the adjustable stroke can be extended slightly to maintain precise contact and consistent cycle quality.
Choose the SCJ63 bore when your application needs around 1559 N of push force at standard shop air. If you require more force, stepping up to the SCJ80 delivers 2513 N push at the same 0.5 MPa. For less force, the SCJ50 provides 982 N. This adjustable-stroke model is the right pick when you need to dial in the stroke end position on the machine; if a fixed, repeatable stroke is sufficient, the standard SC series is a more economical choice. For a direct replacement, match the 63 mm bore, 135 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting. If you later need position sensing, a magnet-equipped version can be ordered.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The pull force is lower due to the area of the 20 mm single piston rod. The maximum push force at the 0.9 MPa operating limit is 2805 N.
A rear-cap screw shortens the stroke end by up to 50 mm from the 135 mm nominal maximum. It replaces another SCJ of the same bore, nominal stroke, and adjust range. It cannot directly replace a fixed-stroke SC cylinder without checking if the slightly longer body length and rear screw clearance are acceptable.
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