The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20TC 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-20TC is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, allowing you to fine-tune the final position by up to 20 mm without removing the cylinder from the machine. Its 63 mm bore delivers a push force of 1559 N at 0.5 MPa, making it a solid mid-range actuator for applications where setup precision matters.
This model comes configured with a TC centre trunnion mount (supplied with the TCM1 bracket, order code F-SC63TC), which lets the cylinder pivot for swinging loads. The 20 mm rod has an M16x1.5 thread, PT1/4 ports, and a 28 mm air cushion for smooth deceleration. Operating pressure is 0.15-1.0 MPa with a speed range of 30-800 mm/s.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 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. |
| ×75 | 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 rear adjusting screw lets technicians dial in the exact stroke end during machine commissioning, eliminating the need for shims or external hard stops.
Use the adjustable stroke to fine-tune the retract position of a pivoting gate on a conveyor, accommodating different product sizes without reprogramming the controller.
In clamping or pressing fixtures, the stroke can be gradually extended over the life of the tooling to compensate for pad wear, maintaining consistent clamping force.
Choose the SCJ63 bore when you need roughly 1560 N of push force at standard plant pressure. If your load is lighter, stepping down to the SCJ50 (982 N push at 0.5 MPa) saves air and space; for heavier demands, the SCJ80 provides 2513 N. The 20 mm adjustable stroke is ideal for commissioning tweaks or taking up mechanical wear.
This cylinder is a direct replacement for another AirTAC SCJ63X75-20TC with the same PT ports and TC trunnion. If you do not need the adjustable stroke, a fixed-stroke SC63X75 with a TC mount is a simpler alternative. For strokes of 300 mm or longer, consider an external guide rail or a guided cylinder to protect the 20 mm rod from side-load bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (reduced due to the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. The adjustable screw changes only the stroke end position, not the force.
Yes, if you need the adjustable stroke feature. The SCJ63 body is slightly longer to house the adjusting screw, but it shares the same 63 mm bore, PT1/4 ports, M16x1.5 rod thread, and TC trunnion mounting pattern (F-SC63TC). Ensure the 20 mm adjustment range is sufficient for your application.
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