The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X550-50 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, 550mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X550-50 is a double-acting, single-rod pneumatic cylinder with a 63 mm bore, a 550 mm nominal stroke, and a 50 mm rear adjusting screw that lets you dial in the exact stroke end position during commissioning or changeover. At 0.5 MPa it delivers 1559 N push and 1402 N pull, and at the maximum operating pressure of 0.9 MPa push force reaches 2805 N, giving it the muscle for medium-duty positioning and clamping tasks where the final stop point needs field tuning.
This adjustable-stroke cylinder shares the same rugged tie-rod construction as the fixed-stroke SC series but adds a rear-cap screw that shortens the stroke end by up to 50 mm without affecting the 550 mm nominal rating. The 20 mm rod runs in a PT1/4 ported body with a 28 mm air cushion, and the SCJ body length A is 197 mm. It operates on 40 µm filtered air from 0.15 to 1.0 MPa across a -20 to +70 °C temperature range with the standard TPU seals.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X550-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 550 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. |
| ×550 | 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.
During machine bring-up, dial the rear screw to set the exact push or clamp stroke end without swapping cylinders or machining hard stops, cutting commissioning time on assembly fixtures.
Adjust the stroke end in minutes when switching between product sizes on case packers or cartoners, eliminating the need for multiple fixed-stroke cylinders and manual stop adjustments.
Over time, tooling or gripper pads wear and the clamp position drifts. The 50 mm adjust range lets operators restore the correct clamp point without disassembling the tooling or replacing the cylinder.
Step up to an 80 mm bore if your application needs more than 1559 N push at 0.5 MPa—the SCJ80 delivers 2513 N at the same pressure. If you never need to alter the stroke after installation, the fixed-stroke SC63X550 saves cost and is slightly shorter overall. For strokes of 550 mm, be aware of side-loading on the rod; if the load is not guided externally, add a guide rail or consider a guided cylinder to prevent rod bending and premature seal wear. A drop-in replacement must match the SCJ63 bore, 550 mm nominal stroke, 50 mm adjust range, PT port thread, basic mounting, and no magnet.
Adjustable-stroke checklist
At 0.5 MPa the push force is 1559 N and pull is 1402 N. At 0.7 MPa push reaches 2182 N, and at the maximum operating pressure of 0.9 MPa push is 2805 N. The theoretical maximum at 1.0 MPa is 318 kgf. Pull force is always lower because the single rod reduces the piston area on the return stroke.
Yes, provided the original unit is an AirTAC SCJ63 with a 550 mm nominal stroke and 50 mm adjust range. Match the port thread (PT), mounting style (basic), and magnet option (none) to ensure dimensional and functional interchangeability. The tie-rod body and rear adjusting screw design are consistent across SCJ generations.
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