Airtac SCJ50 Standard Cylinder SCJ50X125-40
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 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-40 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X125-40
The SCJ50X125-40 delivers 982 N of push force at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa, using a 20 mm diameter piston rod. Its 40 mm rear adjusting screw allows the effective stroke to be tuned down from the nominal 125 mm, providing flexibility during setup without replacing the cylinder.
With a PT1/4 port, an M16x1.5 rod thread, and a 21 mm air cushion, this double-acting, single-rod cylinder fits into compact spaces with a body length of 194 mm. The tie-rod construction makes it a robust choice for general industrial automation tasks requiring on-machine stroke adjustment.
Airtac SCJ50 Standard Cylinder SCJ50X125-40 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 40 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 SCJ50X125-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -40 | 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 SCJ50X125-40 Is Used
Format Changeovers
Quickly adjust the end stop by up to 40 mm when a packaging machine switches between different box sizes, eliminating manual stop repositioning.
Commissioning Trials
Fine-tune the actuator stroke during initial machine setup to dial in the perfect clamping or pressing depth without swapping shims.
Wear Compensation
Take up mechanical play or tooling wear over time by slightly extending the effective stroke, maintaining consistent process quality.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-40 the Right Cylinder?
Choose the SCJ50X125-40 when you need to fine-tune the end position by up to 40 mm on a machine. If your force requirements increase, stepping up to the 63 mm bore provides 1559 N of push at 0.5 MPa. For applications where the stroke is fixed and will never need field adjustment, the standard SC50X125 is a simpler, cost-effective alternative. A direct replacement must match the 50 mm bore, 125 mm nominal stroke, 40 mm adjust range, and PT port thread.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ50X125-40 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 1767 N.
A rear-cap adjusting screw lets you shorten the stroke end by up to 40 mm. This sets a new mechanical stop for the piston, reducing the effective stroke from the 125 mm nominal maximum without changing the cylinder's force or speed.
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Related AirTAC SCJ Adjustable-Stroke Cylinders
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