The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-50 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-50 delivers a robust 1559 N of push force at 0.5 MPa, making it a workhorse for mid-range automation tasks that demand both power and precision. Its 50 mm rear adjusting screw allows operators to fine-tune the stroke end position on the fly, a critical advantage during commissioning or when adapting to variable part sizes without swapping the cylinder.
This double-acting, single-rod cylinder features a 20 mm diameter piston rod and a PT1/4 port. The integrated air cushion, with a 28 mm cushion length, decelerates the piston smoothly at the end of its 300 mm nominal stroke. With a body length A of 197 mm, it provides a compact yet powerful solution for space-constrained applications.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 adjustment range lets engineers precisely dial in the optimal stroke end for a new assembly station without needing to machine custom stops or order multiple fixed-stroke cylinders for trial.
On a packaging line switching between box sizes, the adjustable stroke allows a quick mechanical change to the pusher's end position, minimizing downtime compared to a full cylinder swap.
The 1559 N push force at 0.5 MPa is ideal for consistent clamping. The stroke adjuster can be used to compensate for tooling wear over time, maintaining a precise clamp point without reprogramming.
For applications requiring more force, stepping up to an 80 mm bore SCJ provides 2513 N of push at the same 0.5 MPa pressure. If your task requires a fixed, non-adjustable stroke, the standard SC63X300 is a direct alternative. For a drop-in replacement, ensure the new unit matches the 63 mm bore, 300 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting configuration.
With a 300 mm stroke, this cylinder is susceptible to side loading and potential rod bending. To ensure longevity and precise linear motion, it is critical to guide the load externally with a rail system or use a guided cylinder if significant off-axis forces are present in the application.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it generates 1559 N of pushing force and 1402 N of pulling force. The maximum push force at 0.9 MPa is 2805 N. The pull force is lower due to the area of the 20 mm piston rod.
Yes, this is a direct form-and-function replacement for an AirTAC SCJ63X300-50. Ensure the port thread (PT), mounting style (basic), and the 50 mm adjustable stroke range match your original unit. It is not dimensionally interchangeable with ISO 15552 cylinders.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.