The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X175-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X175-75 is a double-acting, single-rod pneumatic cylinder with a 75 mm field-adjustable stroke range built into the rear cap. At 0.5 MPa, it delivers 1559 N of push force and 1402 N on the pull stroke, making it a strong mid-range actuator for tasks that need fine end-position tuning without swapping hardware.
This 63 mm bore model uses a 20 mm diameter piston rod, PT1/4 ports, and an M16x1.5 rod thread for easy tooling attachment. The integrated air cushion provides a 28 mm deceleration zone at each end, and the tie-rod construction keeps the body length to 197 mm for the SCJ variant, slightly longer than a fixed-stroke SC to house the adjusting mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X175-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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.
A packaging line switching between box heights uses the 75 mm rear screw to dial in the exact pressing depth for each SKU, eliminating manual stop adjustments and reducing changeover time.
In a woodworking jig, the adjustable stroke end compensates for tooling wear or material thickness variation over a production run, maintaining consistent clamp force without reprogramming the PLC.
During machine commissioning, engineers fine-tune the actuator's end position across the full 75 mm range to find the optimal stroke for a new assembly sequence before locking in the final parameter.
Step up to an 80 mm bore (2513 N push at 0.5 MPa) if the 1559 N force is marginal after factoring in the pull reduction, or down to a 50 mm bore (982 N) to save air and space. The 75 mm adjust range on this model is ideal for commissioning trials and format changeovers; if you never need to alter the stroke after setup, the fixed-stroke SC63X175 is a simpler, lower-cost alternative. For exact drop-in replacement, match a genuine AirTAC SCJ cylinder with 63 mm bore, 175 mm nominal stroke, a -75 adjust range, PT ports, and the same basic mounting configuration.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it generates 1559 N pushing out and 1402 N pulling in. At the maximum 0.9 MPa, the push force reaches 2805 N. The pull force is always lower because the rod takes up part of the piston area on the return side.
Yes, provided the mounting and porting match. The SCJ63X175-75 has the same envelope as an SC63X175 but adds a rear adjusting screw. You must ensure there is clearance behind the rear cap for the screw and access for a wrench. The mounting foot, flange, or trunnion brackets from the SC series fit this SCJ model.
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