The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-50FA is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X50-50FA delivers 1559 N of push force at 0.5 MPa, making it a robust mid-range actuator for tasks needing a field-tunable stroke end. Its 50 mm rear-cap adjustment screw lets you dial in the exact stop position without swapping the cylinder, which is invaluable during commissioning or when a machine needs to handle multiple product sizes.
This model uses a 20 mm diameter piston rod and M16x1.5 rod thread for secure tooling attachment. The front rectangular flange (FA) simplifies panel or bulkhead mounting, and the 28 mm air cushion at each end quietly decelerates the piston. The body length A(SCJ) is 197 mm, providing a compact envelope for a 63 mm bore cylinder.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-50FA |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 50 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Adjust the push stroke end in minutes to accommodate different box heights on a case packer, eliminating the need for multiple fixed-stroke cylinders and reducing changeover time.
Fine-tune the final clamp position with the rear screw to apply consistent pressure on parts with slight thickness variations, preventing damage or incomplete engagement.
Use the 50 mm adjustment range to compensate for tooling wear over time, maintaining a precise end-of-stroke position on a drilling or stamping fixture without reprogramming.
Choose the SCJ63 when you need a step up in force from the 40 mm bore (628 N push at 0.5 MPa). If your application demands a fixed, repeatable stroke with no field adjustment, the standard SC63 is a simpler, more cost-effective alternative. For loads that require guidance against side forces, especially on strokes over 300 mm, pair this cylinder with an external guide rail.
As a direct replacement, match the 63 mm bore, 50 mm nominal stroke, 50 mm adjust range, PT port thread, and FA front flange mounting. The mounting accessory code is F-SC63FA. This cylinder does not include a magnet; for sensor feedback, select a model with the -S suffix.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 318 kgf. Because it is a single-rod cylinder, the pull force is lower due to the rod area.
A rear-cap screw lets you shorten the stroke end by up to 50 mm, acting as a built-in hard stop. It is a direct dimensional replacement for an SC63 of the same bore and nominal stroke, but adds field adjustability. Ensure the mounting (FA) and port thread (PT) match your existing setup.
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