The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X175-50STC 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, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X175-50STC is a double-acting, single-rod tie-rod cylinder that lets you fine-tune the stroke end position by up to 50 mm without removing the cylinder from the machine. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa (2805 N at 0.9 MPa), driven by a 20 mm piston rod and cushioned over a 28 mm length for smooth deceleration.
This specific model is factory-configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion pivot (TC) that ships with the TCM1 bracket (order code F-SC63TC). The body length A(SCJ) is 197 mm, and the PT1/4 port supplies filtered air from 0.15 to 1.0 MPa. It is a genuine AirTAC adjustable-stroke unit sourced through authorised distribution.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X175-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 175 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. |
| ×175 | 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.
The 50 mm rear screw adjustment allows engineers to dial in the exact stroke end position during machine setup without swapping cylinders or machining external stops, saving hours of commissioning time.
On packaging or assembly lines that handle multiple product sizes, the adjustable stroke lets operators quickly reset the cylinder's end position for a new format, reducing changeover downtime.
In clamping or pressing fixtures, the stroke can be incrementally extended over the cylinder's service life to compensate for tooling or pad wear, maintaining consistent contact force without mechanical shimming.
Choose the SCJ63 when a 50 mm adjustable stroke range is needed for commissioning or format changes in the 63 mm bore class. If your force requirement is lower, the 50 mm bore SCJ50 provides 982 N push at 0.5 MPa; for higher force, the 80 mm bore SCJ80 steps up to 2513 N. This model's centre trunnion mounting suits pivoting applications where the cylinder body needs to swing.
For a direct replacement, match the 63 mm bore, 175 mm nominal stroke, 50 mm adjust range, PT1/4 port, TC trunnion mount, and built-in magnet. At a 175 mm stroke, rod deflection is minimal under axial loading, but if the application introduces side forces, pair the cylinder with an external guide rail or consider a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the difference is due to the 20 mm single rod). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The theoretical maximum at 1.0 MPa is 318 kgf.
Yes, if you need the 50 mm adjustable stroke feature. The SCJ63X175-50 shares the same bore, port (PT1/4), and rod dimensions as the SC63, but the body is slightly longer to house the rear adjusting screw. Ensure your mounting arrangement accommodates the A(SCJ) length of 197 mm and that you match the TC trunnion and magnet option if present on the original.
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