The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-20 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. Ø63mm bore, 70mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X70-20 is a double-acting, single-rod pneumatic cylinder offering a nominal 70 mm stroke with a 20 mm field-adjustable range via a rear-cap screw. This allows precise stroke-end tuning without cylinder replacement. With a 20 mm rod diameter and PT1/4 ports, it delivers 1559 N of push force at 0.5 MPa, scaling up to 2805 N at 0.9 MPa.
Built on a robust tie-rod design, the SCJ63 features a 28 mm air cushion for smooth deceleration and a body length of 197 mm. The adjustable screw shortens the stroke end by up to 20 mm, making it ideal for commissioning fine-tuning or format changeovers. This model is the basic configuration with TPU seals and PT threads.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X70-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 70 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, 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. |
| ×70 | 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.
Dial in the exact end-stop position during machine setup without swapping cylinders. The 20 mm screw adjustment compensates for stack-up tolerances in real time.
Quickly adapt the stroke end for different product sizes on packaging or assembly lines. Adjust the screw to set a new stopping point in seconds.
Take up mechanical play or tooling wear over time by advancing the stroke end. Maintain consistent clamping or pressing force without reprogramming.
Select the SCJ63 when you need to fine-tune the piston end position within a 20 mm window. If your application requires a fixed, non-adjustable stroke, the standard SC63 is a more economical choice. For higher force, step up to the SCJ80, which provides 2513 N of push force at 0.5 MPa; for a more compact solution, the SCJ50 offers 982 N.
This cylinder is a direct replacement for another AirTAC SCJ63 with a 70 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting. For strokes over 300 mm, consider an external guide to manage side loads and prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at the 0.9 MPa operating limit is 2805 N. The adjustable screw does not alter the force output.
A screw in the rear cap mechanically limits the piston's retraction stroke end. You can shorten the effective stroke by up to 20 mm from the nominal 70 mm. It is a mechanical stop, not a speed or pressure control.
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