Airtac SCJ50 Standard Cylinder SCJ50X80-20SLB
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X80-20SLB is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke80 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X80-20SLB
The SCJ50X80-20SLB is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 982 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, allowing operators to fine-tune the piston stop position without removing the cylinder or adding external hard stops. The 50 mm bore houses a 20 mm diameter piston rod and uses PT1/4 ports, with a 21 mm air cushion at each end for smooth deceleration.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and is equipped with an LB-style axial foot mount (F-SC50LB) for secure surface installation. The body length A(SCJ) is 194 mm, making it a compact solution for applications where the working stroke must be precisely dialed in during commissioning or changeover. It operates on 40 µm filtered air within a 0.15–1.0 MPa pressure range and a standard temperature range of -20 to +70 °C.
Airtac SCJ50 Standard Cylinder SCJ50X80-20SLB Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X80-20SLB |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 20 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 SCJ50X80-20SLB
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ50X80-20SLB Is Used
Commissioning & Setup
The 20 mm adjustment screw allows technicians to dial in the exact stroke end during initial machine setup, compensating for minor assembly tolerances without swapping shims or stops.
Format Changeover
On packaging lines, quickly re-set the cylinder's end position to accommodate different box or product sizes, reducing downtime between production runs with a simple screw adjustment.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be used to take up slack caused by pad wear over time, maintaining consistent contact force without replacing the tooling.
Is the Airtac SCJ50 Standard Cylinder SCJ50X80-20SLB the Right Cylinder?
Select the SCJ50X80-20SLB when you need a mid-range force actuator with the ability to fine-tune the stroke end by up to 20 mm. If your force requirement is lower, stepping down to a 40 mm bore reduces push force to 628 N at 0.5 MPa; for higher demands, a 63 mm bore provides 1559 N. Choose this adjustable-stroke SCJ over a fixed-stroke SC when machine setup requires iterative end-position adjustment, such as aligning a stop point with a sensor or workpiece. For direct replacement, match the 50 mm bore, 80 mm nominal stroke, 20 mm adjust range, PT port thread, LB foot mount, and built-in magnet. If the application involves significant side loading, consider an external guide rail or a guided cylinder to protect the rod and bearings.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ50X80-20SLB FAQ
At 0.5 MPa, this 50 mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1767 N. The adjustable stroke screw does not alter the cylinder's force output.
A rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm, effectively changing the piston's stopping point in the field. An SC fixed-stroke cylinder has a non-adjustable end position. The SCJ is ideal for applications needing fine-tuning, while the SC is a simpler, cost-effective choice for fixed-motion tasks.
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