The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X350-75S is a double-acting, single-rod tie-rod cylinder with a field-adjustable stroke, offering a nominal maximum stroke of 350 mm and an adjustment range of 75 mm via the rear-cap screw. This 63 mm bore model delivers a push force of 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa, making it suitable for applications requiring substantial force with the ability to precisely dial in the retracted end position during commissioning or changeovers.
Equipped with a built-in magnet (-S suffix), this cylinder is ready for direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors for reliable end-of-stroke detection. The 20 mm rod diameter and 28 mm air cushion provide robust guidance and smooth deceleration, while the PT1/4 port ensures straightforward pneumatic connection. With a body length A(SCJ) of 197 mm, it is a compact solution for integrating adjustable-stroke functionality into new or existing machinery.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 75 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. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment range allows engineers to precisely dial in the final stroke end position during machine commissioning without swapping cylinders or fabricating custom end-stops, significantly reducing setup time.
Quickly adapt the cylinder's stroke for different product sizes on a packaging machine. The rear adjusting screw enables operators to make fast, repeatable changes for varying box or carton dimensions.
In high-cycle clamping or pressing fixtures, the adjustable stroke can be used to take up mechanical wear over time. The stroke end can be extended slightly to maintain consistent clamping force without replacing the actuator.
Select the SCJ63 bore when your application requires a force class around 1559 N at 0.5 MPa. If you need more force, step up to the SCJ80, which provides 2513 N of push force at the same pressure. For lower force requirements, the SCJ50 delivers 982 N. This adjustable-stroke model is ideal when you need to fine-tune the stroke end by up to 75 mm without replacing the cylinder; if a fixed stroke is sufficient, the standard SC63 is a simpler alternative. For strokes of 350 mm, be mindful of potential rod bending under high side loads and consider an external guide or a guided cylinder if the load is not perfectly axial.
This exact configuration (SCJ63X350-75S) is a direct replacement for another AirTAC SCJ cylinder of the same bore, nominal stroke, 75 mm adjustment range, PT port thread, and built-in magnet. The basic mounting style uses the standard tie-rod end plates for direct attachment. If a pivoting motion is required, the TC centre trunnion (F-SC63TC) is the correct SCJ-compatible accessory.
Adjustable-stroke checklist
The maximum push force is 2805 N at the 0.9 MPa operating limit (1559 N at 0.5 MPa). The rear adjusting screw only sets the physical stroke end position; it does not change the cylinder's bore, piston area, or the output force generated by the air pressure.
The SCJ uses a subset of SC mounting accessories. It is compatible with FA front flange, LB foot mount, and TC centre trunnion brackets. The FB rear flange and CA/CB clevis mounts are not compatible. This model has basic mounting, but you can add an accessory like the F-SC63TC trunnion kit if needed.
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