The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-30S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap adjusting screw provides up to 30 mm of stroke shortening, allowing precise end-position tuning without removing the cylinder. The 63 mm bore generates 1559 N of push force at 0.5 MPa, making it suitable for medium-duty positioning and clamping tasks.
This model includes a built-in magnet (suffix -S), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The 20 mm piston rod, PT1/4 ports, and 28 mm air cushion ensure smooth deceleration. The body length A(SCJ) is 197 mm plus stroke, slightly longer than a fixed-stroke SC due to the adjusting mechanism.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 30 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. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -30 | 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.
Fine-tune the retract stroke end during machine commissioning to perfectly align a pusher or stop gate, compensating for assembly tolerances without shims or re-machining brackets.
Adjust the cylinder's stroke end via the rear screw to handle different box or pallet sizes on a conveyor line, enabling quick format changeovers without replacing the actuator.
Periodically adjust the stroke to take up mechanical wear in a clamping or pressing fixture, maintaining consistent clamping force and position over thousands of cycles.
Select the SCJ63 bore when your application needs around 1559 N of push force at standard plant air pressure. If you require more force, step up to the 80 mm bore, which delivers 2513 N push at 0.5 MPa. For lighter, more compact needs, the 50 mm bore provides 982 N. This adjustable-stroke version is ideal where the final stop position must be dialed in during commissioning or changed for different product formats. If your stroke is fixed and never needs adjustment, the standard SC63 cylinder is a more economical choice.
For this 400 mm stroke, be mindful of side loads which can cause rod bending. Use an external linear guide or switch to a guided cylinder if the load is not perfectly axial. This cylinder is a direct replacement for another AirTAC SCJ63 with a 400 mm nominal stroke, 30 mm adjust range, PT ports, and a magnet sensor option.
Adjustable-stroke checklist
The theoretical push force at 0.5 MPa is 1559 N, and the pull force is 1402 N (due to the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N. Always apply a safety factor for real-world dynamic loads.
You can replace a fixed-stroke SC63 with an SCJ63 if the adjustable range is acceptable and the body length increase is accommodated. The SCJ63 is a direct match for another SCJ63 of the same bore, nominal stroke, 30 mm adjustment range, PT port thread, and magnet option. Mounting accessories from the SCJ subset (FA, LB, TC) are compatible.
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