The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X650-50 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, 650mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X650-50 is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly on the machine. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm without removing the cylinder, which is invaluable during commissioning or when a process needs fine end-position tuning. With a 20 mm rod and PT1/4 ports, it delivers 1559 N of push force at 0.5 MPa.
At 0.9 MPa, the push force climbs to 2805 N, giving this 63 mm bore cylinder a substantial power reserve for clamping, pressing, and positioning tasks. The built-in variable air cushion (28 mm length) decelerates the piston smoothly, protecting end caps and reducing noise. The body length A(SCJ) is 197 mm, and the standard stroke range for this bore extends to 1500 mm, so this 650 mm unit is well within standard manufacturing limits.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X650-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 650 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. |
| ×650 | 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.
A packaging line running different box sizes uses the 50 mm adjustment to quickly reset the stop position for each product format, eliminating manual shimming or hard-stop changes.
During assembly of press-fit components, the adjusting screw allows operators to fine-tune the final insertion depth by up to 50 mm to compensate for part tolerance stack-up without swapping tooling.
A welding fixture uses the SCJ63X650-50 to clamp parts. As contact pads wear over thousands of cycles, the stroke end is extended slightly via the rear screw to maintain consistent clamping pressure.
Choose this 63 mm bore when your load needs the step up from a 50 mm cylinder (982 N push at 0.5 MPa) but does not require the full force of an 80 mm unit (2513 N push at 0.5 MPa). The 50 mm adjustable range is ideal for machines that undergo regular format changes or where the exact stroke must be dialled in after installation. If your application does not need field adjustability, the fixed-stroke SC63X650 is a simpler, cost-effective alternative.
For strokes of 650 mm, always check for potential side loading on the 20 mm rod. If the load is not guided externally, rod deflection can cause premature seal wear and bearing damage. In such cases, couple the cylinder with an external linear guide or consider a guided cylinder assembly. A direct replacement must match the 63 mm bore, 650 mm nominal stroke, 50 mm adjust range, PT port thread, and basic mounting configuration.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder generates 1559 N of push force and 1402 N of pull force. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 2805 N.
Yes, this is a direct dimensional and performance replacement for any AirTAC SCJ63 cylinder with a 650 mm nominal stroke and a 50 mm adjustable range. Ensure the port thread (PT), mounting style (basic), and magnet option (none) match your existing setup. The tie-rod body length and mounting hole pattern are identical to the original SCJ63 design.
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