Airtac SCJ50 Standard Cylinder SCJ50X125-100TC
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-100TC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 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-100 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-100TC
The SCJ50X125-100TC is a double-acting, single-rod pneumatic cylinder with a 50mm bore and a nominal stroke of 125mm, featuring a rear-cap adjusting screw that provides a 100mm field-adjustable stroke-end range. This allows machine builders to fine-tune the piston stop position without swapping the cylinder, making it ideal for commissioning trials and format changeovers. The centre trunnion (TC) mount, supplied with its TCM1 bracket, enables the cylinder to pivot, absorbing misalignment in swinging applications.
At 0.5 MPa air pressure, this cylinder delivers 982 N of push force and 825 N of pull force, with a maximum push thrust of 1767 N at 0.9 MPa. It uses a 20mm diameter piston rod with an M16x1.5 male thread and PT1/4 ports. The standard adjustable air cushion decelerates the piston over the final 21mm of travel, and the body length (A dimension) is 194mm, slightly longer than the fixed-stroke SC version to accommodate the adjusting mechanism.
Airtac SCJ50 Standard Cylinder SCJ50X125-100TC Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-100TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 100 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 SCJ50X125-100TC
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ50X125-100TC Is Used
Format Changeovers
Quickly adjust the end-stop position for different product sizes on packaging or assembly machines without mechanical modifications, reducing downtime between batches.
Diverter Gates
Fine-tune the stroke end of a pivoting diverter arm on a conveyor line to ensure precise alignment with multiple chute positions, using the TC mount for the swinging motion.
Clamping & Pressing
Set a precise, repeatable clamping depth for workpieces of varying thicknesses in a welding or bonding fixture, using the 100mm adjustment range to accommodate different tooling setups.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-100TC the Right Cylinder?
Choose the SCJ50X125-100TC when your application requires a 125mm maximum stroke with the ability to shorten the end position by up to 100mm on the machine. If you need more force, stepping up to a 63mm bore provides 1559 N of push force at the same 0.5 MPa pressure. For applications that do not require stroke adjustment, the fixed-stroke SC50X125 is a simpler and more cost-effective alternative. This model is a direct replacement for another AirTAC SCJ adjustable-stroke cylinder with a 50mm bore, 125mm nominal stroke, 100mm adjustment range, PT ports, and a TC centre trunnion mount.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ50X125-100TC FAQ
A screw mechanism in the rear cap allows you to shorten the piston's stroke end position by up to 100mm from its nominal 125mm maximum. This sets a new mechanical stop, so the cylinder consistently retracts to the adjusted position. It does not change the cylinder's force or speed.
The theoretical push force is 982 N at 0.5 MPa and 1767 N at 0.9 MPa. The pull force is lower due to the single 20mm rod: 825 N at 0.5 MPa. For applications requiring a holding function when air pressure is lost, an external rod lock or pilot-operated check valve must be used, as the air cushion and stroke adjuster do not lock the piston.
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