Airtac SCJ50 Standard Cylinder SCJ50X350-20S
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X350-20S 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, 350mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke350 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X350-20S
The SCJ50X350-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you a 20 mm fine-tuning window on the 350 mm nominal stroke without swapping the unit. At 0.5 MPa it delivers 982 N push and 825 N pull, driven by a 20 mm piston rod through PT1/4 ports. The rear-cap screw lets commissioning teams dial in the exact end position, and the built-in magnet works with CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
Body length A for the SCJ50 series is 194 mm, and the adjustable cushion decelerates the piston smoothly over the last 21 mm of travel. This genuine AirTAC tie-rod cylinder operates on 40 µm filtered air from 0.15 to 1.0 MPa and is rated for -20 to +70 °C with its standard TPU seals. The 350 mm stroke is well within the 1200 mm maximum for the 50 mm bore.
Airtac SCJ50 Standard Cylinder SCJ50X350-20S Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X350-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 350 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 SCJ50X350-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×350 | 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 SCJ50X350-20S Is Used
Commissioning & Setup
During machine commissioning, the 20 mm rear adjuster lets technicians fine-tune the 350 mm stroke end position in seconds, eliminating the need to shim or reposition the entire cylinder for perfect alignment with mating tooling.
Wear Compensation
In high-cycle clamping or pressing fixtures, the adjustable stroke compensates for pad or tooling wear over time. Operators can simply turn the rear screw to restore the exact clamping depth without disassembling the station.
Product Changeover
On packaging or sorting conveyors that handle different box sizes, the SCJ50X350-20S allows a quick stroke-end adjustment for each product format. The built-in magnet provides positive sensor confirmation at the new stop position.
Is the Airtac SCJ50 Standard Cylinder SCJ50X350-20S the Right Cylinder?
Choose the SCJ50 when your application needs around 1 kN of push force at standard shop air. If you require more force, step up to the 63 mm bore (SCJ63) which provides 1559 N push at 0.5 MPa; for a lighter, more compact solution the 40 mm bore (SCJ40) offers 628 N. The adjustable-stroke feature is ideal when you need to fine-tune the end position during setup or after tooling wear, but if your stroke length is permanently fixed, a standard SC cylinder is a simpler, cost-effective alternative. For this specific model, a direct replacement must match the 50 mm bore, 350 mm nominal stroke, 20 mm adjust range, PT1/4 ports, and the built-in magnet. At 350 mm, be mindful of side loads—if the rod is pushing off-centre, add an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
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 SCJ50X350-20S FAQ
At 0.5 MPa, the cylinder produces 982 N of push force and 825 N of pull force. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 200 kgf. The rear adjusting screw only changes the stroke end position; it does not alter the cylinder's force output.
A screw in the rear cap sets the retract end position, shortening the nominal 350 mm stroke by up to 20 mm. It is a mechanical stop for the piston, not a speed or force control. This SCJ50X350-20S is a direct replacement for any AirTAC SCJ adjustable cylinder with a 50 mm bore, 350 mm nominal stroke, 20 mm adjustment range, PT1/4 ports, and a magnetic piston. It cannot replace a fixed-stroke SC or a different adjust range.
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