The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X35-20S 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, 35mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X35-20S is a double-acting, single-rod pneumatic cylinder from AirTAC, featuring a rear-cap adjusting screw that provides a 20 mm field-adjustable stroke range. This allows engineers to fine-tune the end position without swapping the cylinder, making it ideal for commissioning and format changeovers. The 63 mm bore delivers 1559 N of push force at 0.5 MPa, while the 20 mm piston rod and PT1/4 ports ensure robust, reliable actuation.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG sensors along the tie-rod barrel for precise end-of-stroke detection. The cylinder body has a length of 197 mm and features an adjustable air cushion for smooth deceleration. It is a genuine AirTAC component, ensuring dimensional consistency and long service life in industrial automation tasks.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X35-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 35 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. |
| ×35 | 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.
The 20 mm adjustment screw allows technicians to quickly dial in the precise stroke end during machine commissioning, eliminating the need to fabricate custom external hard stops.
On clamping or pressing fixtures, the adjustable stroke can be periodically extended to compensate for tooling wear or material compression set, maintaining consistent clamp force without a cylinder change.
In packaging or assembly lines, operators can adjust the stroke end to suit different product sizes or batch formats in seconds, drastically reducing downtime between production runs.
Choose the SCJ63 bore when your application requires a push force around 1559 N at standard shop air. If you need more force, stepping up to the SCJ80 bore provides 2513 N of push force at the same 0.5 MPa pressure. For applications that do not require field-adjustable stroke, the fixed-stroke SC63 series offers a simpler, more compact alternative. A direct replacement must match the 63 mm bore, 35 mm nominal stroke, 20 mm adjustment range, PT port thread, and the built-in magnet option.
This cylinder is a basic mount model, so it requires a mounting bracket from the SCJ subset for installation. Compatible options include the FA front flange (F-SC63FA) or the LB foot mount (F-SC63LB). For strokes of 300 mm or greater, always evaluate side-loading on the 20 mm rod; an external guide rail or a switch to a guided cylinder is recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single-rod design, providing 1402 N at 0.5 MPa.
Yes, provided the mounting and porting match. The SCJ body is slightly longer to house the adjustment mechanism, so you must check the 197 mm body length clearance. The SCJ63X35-20S also includes a magnet for sensor mounting, which a standard SC may not have.
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