Airtac SCJ50 Standard Cylinder SCJ50X65-20
The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X65-20 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, 65mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Nominal stroke65 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM16×1.5
- CushionAdjustable, 21 mm
About the Airtac SCJ50 Standard Cylinder SCJ50X65-20
The SCJ50X65-20 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This 50 mm bore model delivers a push force of 982 N at 0.5 MPa and a pull force of 825 N, making it a robust mid-range actuator for tasks requiring fine-tuned positioning without swapping the cylinder.
Equipped with a 20 mm diameter piston rod and PT1/4 ports, the SCJ50X65-20 features an adjustable air cushion (21 mm cushion length) for smooth deceleration. The tie-rod body has a length of 194 mm, and the standard operating pressure spans 0.15–1.0 MPa. This genuine AirTAC unit is ideal for commissioning adjustments and format changeovers where the end position must be dialed in precisely.
Airtac SCJ50 Standard Cylinder SCJ50X65-20 Technical Specifications
| Model | Airtac SCJ50 Standard Cylinder SCJ50X65-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 65 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 SCJ50X65-20
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×65 | 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 SCJ50X65-20 Is Used
Commissioning & Setup
Fine-tune the end-stop position during machine commissioning without removing the cylinder. The 20 mm screw adjustment allows engineers to dial in the exact stroke needed for a new fixture or tool.
Format Changeovers
Quickly adapt to different product sizes on packaging or assembly lines. Operators can adjust the stroke end to accommodate a new box height or component length in minutes, minimizing downtime.
Wear Compensation
Compensate for mechanical wear in linkages or tooling over time. The adjustable stroke end lets you take up slack without replacing parts, maintaining consistent clamping or pressing force.
Is the Airtac SCJ50 Standard Cylinder SCJ50X65-20 the Right Cylinder?
Step up to a 63 mm bore SCJ if your application demands more than 982 N of push force at 0.5 MPa; the SCJ63 delivers 1559 N. If the stroke is fixed and will never need field adjustment, a standard SC50X65 single-rod cylinder is a simpler, cost-effective alternative. For direct replacement, match the 50 mm bore, 65 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting configuration. At this 65 mm stroke, side-loading is typically minimal, but for any off-axis force, an external guide rail is recommended to protect the rod bearing.
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 SCJ50X65-20 FAQ
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The maximum push force at the 0.9 MPa operating limit is 1767 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the rod area on the return side.
Yes, if you need the adjustable stroke feature. The SCJ50X65-20 shares the same 50 mm bore, port size, and mounting footprint as a fixed-stroke SC50, but adds a rear adjusting screw for 20 mm of stroke-end reduction. Ensure the slightly longer body length fits your machine envelope.
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