Airtac SCJ50 Standard Cylinder SCJ50X125-40SLB
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-40SLB 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 SCJ50X125-40SLB
The SCJ50X125-40SLB is a double-acting, single-rod pneumatic cylinder offering 40 mm of field-adjustable stroke reduction via a rear-cap screw, letting you fine-tune the 125 mm nominal stroke end without removing the unit. Its 20 mm rod and PT1/4 ports deliver 982 N of push force at 0.5 MPa, making it a versatile mid-range actuator for tasks that need on-machine tweaking.
This model includes a built-in magnet for CMSG/DMSG/EMSG sensors and comes with an LB foot-mount bracket (F-SC50LB) for stable surface installation. The tie-rod body has a 194 mm base length and 21 mm of air cushioning, ensuring controlled deceleration even after you dial in the exact stop position.
Airtac SCJ50 Standard Cylinder SCJ50X125-40SLB Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-40SLB |
|---|---|
| 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 SCJ50X125-40SLB
| 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 SCJ50X125-40SLB Is Used
Format Changeover Stops
On packaging lines, quickly adjust the end position for different box sizes by turning the rear screw, avoiding mechanical stop changes.
Dispenser Calibration
Fine-tune the stroke end of a glue or paste dispenser during commissioning to achieve precise bead placement without reprogramming.
Wear Compensation
Compensate for seal or tooling wear over time by slightly extending the effective stroke, maintaining consistent clamping or pressing force.
Is the Airtac SCJ50 Standard Cylinder SCJ50X125-40SLB the Right Cylinder?
Choose this 50 mm bore when 982 N of push at 0.5 MPa fits your load; if you need more force, step up to the 63 mm bore which provides 1559 N. For applications that never require stroke adjustment, a fixed-stroke SC50X125 may simplify the bill of materials. This SCJ replaces another SCJ of identical 50 mm bore, 125 mm nominal stroke, 40 mm adjustment range, PT thread, and LB mount—matching the magnet option is essential for sensor compatibility.
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 SCJ50X125-40SLB FAQ
At 0.5 MPa, it generates 982 N pushing and 825 N pulling. Maximum push force at 0.9 MPa is 1767 N. The 40 mm adjustment screw only changes the stroke end position, not the output force.
Yes, the -S suffix means a magnet is built into the piston, so you can clamp CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the barrel for end-of-stroke detection.
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