The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X175-20 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, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X175-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, offering a 20 mm adjustment range via a rear-cap screw. This 63 mm bore actuator delivers a push force of 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa, making it suitable for applications requiring a mid-range force that can be fine-tuned on the machine.
Its 20 mm rod and PT1/4 ports are paired with a 28 mm air cushion for smooth deceleration. The body length A is 197 mm, and the nominal 175 mm stroke is well within the 1500 mm maximum standard stroke for this bore. The stroke-end screw allows operators to precisely dial in the stopping position without swapping the cylinder or adding external hard stops.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X175-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 175 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. |
| ×175 | 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.
Fine-tune the end-stop position during initial machine setup by up to 20 mm, eliminating the need to re-drill mounting holes or swap cylinders when the ideal stroke is slightly less than 175 mm.
Adjust the stroke end for different product sizes on a packaging or sorting line. The 20 mm range allows a single cylinder model to handle multiple formats without mechanical reconfiguration.
Take up mechanical wear in linkages or tooling over time by advancing the stroke end. The 1559 N push force at standard plant pressure handles robust clamping and pressing tasks.
Choose the SCJ63X175-20 when you need to commission a 175 mm stroke with the ability to shorten the end position by up to 20 mm for format changes or wear take-up. If the push force is too high, stepping down to a 50 mm bore reduces it to 982 N at 0.5 MPa; if more force is needed, an 80 mm bore provides 2513 N. For applications where the stroke is fixed and never needs adjustment, the standard SC63X175 is a simpler, cost-effective alternative.
A direct replacement must match the 63 mm bore, 175 mm nominal stroke, 20 mm adjustment range, and PT port thread. This basic model has no magnet or mounting bracket. For strokes over 300 mm, consider an external guide to prevent rod bending from side loads.
Adjustable-stroke checklist
A screw in the rear cap lets you shorten the stroke end by up to 20 mm. The nominal 175 mm is the maximum; you can reduce it to as little as 155 mm. This adjustment does not change the cylinder's bore, force output, or speed—it only sets the piston's stopping position.
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area.
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