The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-100S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø63mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X120-100S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston's stop position by up to 100 mm without removing the unit. Its 63 mm bore delivers 1559 N of push force at 0.5 MPa, making it a solid mid-range actuator for tasks that need repeatable end-point adjustment.
A rear-cap adjusting screw physically limits the stroke end, so the 120 mm nominal stroke can be shortened anywhere within that 100 mm window during commissioning or format changes. The built-in magnet (suffix -S) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for precise end-of-stroke or mid-stroke position feedback, while the 28 mm air cushion at each end decelerates the piston quietly.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 100 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. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -100 | 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.
During machine bring-up, technicians can dial in the exact stroke end position with the rear screw, eliminating the need to swap out fixed-stroke cylinders or fabricate external hard stops.
On packaging or sorting lines, the 100 mm adjust range lets operators quickly reset a pusher or diverter's end point for different box sizes without mechanical modifications.
In clamping or pressing fixtures, the adjustable stroke can be gradually extended over time to compensate for tooling or pad wear, maintaining consistent contact force without reprogramming the machine.
This 63 mm bore SCJ suits applications needing more force than a 50 mm cylinder (982 N push at 0.5 MPa) but without stepping up to the larger 80 mm frame (2513 N push). If your stroke does not need field adjustment, the fixed-stroke SC63 series offers a simpler, more compact alternative. For a direct replacement, match the 63 mm bore, 120 mm nominal stroke, 100 mm adjust range, PT port thread, basic mounting, and the -S magnet option.
For strokes of 300 mm or more, consider the rod's slenderness ratio. At longer extensions, side loads can cause rod bending or uneven seal wear; using an external linear guide or switching to a guided cylinder will protect the rod and extend service life.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the difference is due to the 20 mm piston rod area). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 2805 N.
Yes, if you need the adjustable stroke feature. The SCJ63 shares the same bore, rod diameter (20 mm), port size (PT1/4), and mounting accessories (FA, LB, TC) as the SC63. Ensure the nominal stroke, adjust range, and magnet option (-S) match your application requirements.
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