The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-50 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, 85mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X85-50 delivers a nominal 85 mm stroke with a 50 mm rear-end adjustment range, letting you fine-tune the extended position without swapping the cylinder. At 0.5 MPa it produces 1559 N push and 1402 N pull, thanks to its 63 mm bore and 20 mm single rod. The 28 mm air cushion decelerates the piston smoothly at both ends, and the tie-rod body measures 197 mm (A dimension), keeping the assembly compact for its force class.
This double-acting unit runs on 40 µm filtered air from 0.15 to 1.0 MPa and operates at -20 to +70 °C with its default TPU seals. The PT1/4 ports and M16x1.5 rod thread match common pneumatic fittings. Because the adjusting screw only sets the stroke end, push and pull forces remain identical to the fixed-stroke SC63 at every pressure.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 85 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. |
| ×85 | 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.
Adjust the 50 mm screw to dial in the exact push stroke during machine setup without re-plumbing or swapping cylinders.
Quickly reset the stroke end for different product sizes on packaging or sorting lines, reducing downtime between batches.
Take up mechanical play in linkages or tooling over time by advancing the rear screw, maintaining consistent end-position accuracy.
Step up to the SCJ80 if you need more force (2513 N push at 0.5 MPa) or down to the SCJ50 (982 N push) for a lighter, faster actuator. Choose this adjustable-stroke model over a fixed SC when you expect to dial in the end position during commissioning, format changes, or after wear. For direct replacement, match bore (63), nominal stroke (85), 50 mm adjust range, PT thread, and basic mount. At 85 mm stroke side-load is minimal, but if the rod sees off-axis loads add an external guide or switch to a guided cylinder.
Adjustable-stroke checklist
At 0.5 MPa the cylinder provides 1559 N pushing and 1402 N pulling. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
Yes, if you need the 50 mm field-adjustable stroke end. The SCJ shares the same bore, rod, ports, and mounting accessories as the SC63. Ensure your machine can accommodate the slightly longer rear cap that houses the adjusting screw.
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