Airtac SCJ50 Standard Cylinder SCJ50X125-75TC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-75TC 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. Ø50mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke125 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-75TC
The SCJ50X125-75TC is a double-acting, single-rod pneumatic cylinder with a 75 mm rear adjusting screw, letting you fine-tune the stroke end on the fly without swapping the unit. Its 50 mm bore delivers 982 N of push force at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa, making it a solid mid-range actuator for tasks that need both power and precise end-position setup.
This model ships with a centre trunnion (TC) mount and the matching TCM1 bracket, so it can pivot as the load moves—ideal for swinging arms or articulating linkages. The 20 mm piston rod, PT1/4 ports, and 21 mm air cushion are standard for the SCJ50 series, and the body length A(SCJ) is 194 mm. It uses the default TPU seals for reliable service from -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X125-75TC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-75TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 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, 21 mm |
| Max stroke | Up to 1200 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.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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.
Model Code: Airtac SCJ50 Standard Cylinder SCJ50X125-75TC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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.
Where the Airtac SCJ50 Standard Cylinder SCJ50X125-75TC Is Used
Format Changeover Stops
The 75 mm adjustment range lets operators quickly reset a mechanical end-stop for different product sizes on packaging or labelling lines, eliminating the need for multiple fixed-stroke cylinders.
Wear Take-Up in Clamping
In a pneumatic clamping fixture, the adjusting screw can be advanced over time to compensate for pad wear or workpiece variation, maintaining consistent clamping force without reprogramming.
Commissioning & Trial Runs
During machine commissioning, engineers can fine-tune the actuator's stroke end to perfectly match the tooling, then lock it down. The TC mount handles the pivoting motion of a press transfer arm.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-75TC the Right Cylinder?
Step up to the SCJ63 bore for 1559 N of push force at 0.5 MPa if your load is marginal, or down to the SCJ40 (628 N) to save space and air. This SCJ50X125-75TC is the right call when you need to dial in a stroke end repeatedly—commissioning a new fixture, accommodating part tolerance stack-up, or changing between product formats. If your application never needs stroke adjustment, the fixed-stroke SC50X125 is a simpler, lower-cost alternative.
For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 50 mm bore, 125 mm nominal stroke, 75 mm adjust range, PT ports, and a TC centre trunnion mount. The 125 mm stroke is well within the 1200 mm maximum for this bore, so side-load concerns are minimal, but always align the rod with the load axis to prevent bending.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ50 Standard Cylinder SCJ50X125-75TC FAQ
At 0.5 MPa, it delivers 982 N pushing and 825 N pulling. The push force increases to 1767 N at the maximum operating pressure of 0.9 MPa. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area.
Yes, if you need field-adjustable stroke control. The SCJ50X125-75TC matches the mounting footprint of an SC50 with a TC mount but adds a rear screw to shorten the stroke end by up to 75 mm. Ensure your machine can accommodate the slightly longer body length A(SCJ) of 194 mm.
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