The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-20S 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X350-20S is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly in the rear cap. With a 20 mm adjusting screw range, you can dial in the exact 350 mm stroke position on the machine without swapping cylinders or adding hard stops. The 63 mm bore delivers 1559 N of push force at 0.5 MPa, and the 20 mm rod with M16x1.5 threads keeps the assembly rigid across the full travel.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for non-contact position sensing. The tie-rod construction uses PT1/4 ports, TPU seals for -20 to +70 C operation, and a 28 mm air cushion that decelerates the piston quietly at both ends. Body length A(SCJ) is 197 mm, making it a compact adjustable-stroke solution for medium-force automation tasks.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X350-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 350 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. |
| ×350 | 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.
Engineers use the rear adjusting screw to fine-tune the 350 mm stroke end during machine bring-up, dialing out tolerance stack without reprogramming the PLC or moving limit switches.
On packaging lines, the 20 mm adjust range lets operators quickly shift a stop or pusher position between product sizes, reducing downtime compared to swapping fixed-stroke cylinders.
In pressing or clamping fixtures, the stroke can be extended slightly over time to compensate for pad or tooling wear, maintaining consistent contact force without replacing the actuator.
Choose the SCJ63 when you need more push than the 40 mm bore (628 N at 0.5 MPa) but a lighter assembly than the 80 mm bore (2513 N). The 20 mm adjustable range is ideal for commissioning tweaks or format changeovers where the stroke end must shift slightly. For fixed-stroke applications, the standard SC63 is a simpler, lower-cost alternative; if the rod must extend from both ends, look at the SCD63 double-rod series.
At a 350 mm nominal stroke, side-loading on the rod becomes a design factor. Mount the cylinder so the load is guided externally, or pair it with a linear rail to prevent rod bending and premature seal wear. To replace this unit, match the 63 mm bore, 350 mm nominal stroke, 20 mm adjust range, PT1/4 ports, basic mounting, and the built-in magnet; the F-SC63LB foot mount or F-SC63TC centre trunnion can be added if your mounting style changes.
Adjustable-stroke checklist
At 0.5 MPa, push force is 1559 N and pull force is 1402 N (the pull force is lower because the 20 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
Yes, if you need the 20 mm stroke-end adjustment. The SCJ63 shares the same bore, rod, port, and mounting accessories (FA, LB, TC) as the SC63. Ensure the slightly longer body length A(SCJ) of 197 mm fits your space, and match the PT thread and magnet option when ordering.
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