The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X425-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 425mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X425-40S delivers a nominal 425 mm stroke with a 40 mm rear-end adjustment range, letting you fine-tune the stroke end on the fly without swapping the cylinder. This single-rod double-acting unit pushes with 1559 N at 0.5 MPa and 2805 N at 0.9 MPa, using a 20 mm diameter rod and PT1/4 ports.
A built-in magnet is included, so CMSG/DMSG/EMSG sensors clamp directly onto the 63 mm bore barrel for reliable end-of-stroke sensing. The body length A(SCJ) is 197 mm, and the adjustable cushion decelerates the piston smoothly over the final 28 mm of travel.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X425-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 425 mm |
| Stroke adjustment | Up to 40 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. |
| ×425 | Nominal (maximum) stroke length in mm. |
| -40 | 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 40 mm adjustment screw lets technicians quickly dial in the exact stop position during machine commissioning, eliminating the need for trial-and-error shimming or multiple cylinder swaps.
On packaging lines, operators can adjust the stroke end to accommodate different box or product sizes without mechanical modifications, reducing downtime between production runs.
In clamping or pressing applications, the adjustable stroke can be used to take up mechanical wear in tooling or fixtures over time, maintaining consistent contact force without replacing the actuator.
Step up to the SCJ80 bore if you need 2513 N push at 0.5 MPa; step down to the SCJ50 for 982 N. This SCJ is the right choice when you need to dial in the stroke end during commissioning or format changes—if your stroke is fixed and never changes, the standard SC cylinder is a simpler, lower-cost alternative. For a direct replacement, match the 63 mm bore, 425 mm nominal stroke, 40 mm adjust range, PT ports, and the -S magnet option. At this stroke length, be mindful of side loads: if the rod sees lateral force, add an external guide or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (pull is lower due to the 20 mm rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N.
A screw in the rear cap lets you shorten the stroke end by up to 40 mm from the nominal 425 mm. It sets a mechanical stop for the piston, so the effective stroke is field-adjustable anywhere between 385 mm and 425 mm without affecting the bore size or force output.
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