The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-20 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X300-20 delivers a robust 982 N push force at 0.5 MPa, making it a reliable workhorse for mid-range pneumatic applications requiring a 300 mm nominal stroke. Its key differentiator is the rear-cap adjusting screw, which provides a 20 mm field-adjustable range to fine-tune the stroke end position without removing the cylinder.
This double-acting, single-rod cylinder uses a 20 mm diameter piston rod and PT1/4 ports, with an adjustable air cushion for smooth deceleration. The tie-rod construction ensures durability, while the 194 mm body length (A dimension) allows for straightforward integration into machine frames.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 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.
| 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.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 50 | Bore size in mm. |
| ×300 | 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.
The 20 mm adjustment screw lets commissioning engineers dial in the precise end-stop position on a new assembly line without swapping out cylinders or machining custom stops.
Quickly adjust the push stroke for different box sizes on a packaging conveyor, reducing downtime between production runs with a simple screw turn.
As gripper pads or tooling tips wear down over time, the adjustable stroke can be extended to compensate, maintaining consistent clamping force and part engagement.
For applications needing more force, stepping up to the 63 mm bore SCJ63X300-20 provides a significant jump to 1559 N push at 0.5 MPa. If a fixed, non-adjustable stroke is sufficient for the task, the standard SC50X300 is a simpler alternative. This SCJ model is a direct replacement for any AirTAC SCJ50X300-20 cylinder with PT ports and basic mounting. For a 300 mm stroke, ensure the load is guided externally if significant side forces are present to prevent rod bending.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, it provides 982 N of pushing force and 825 N of pulling force. The maximum push force at 0.9 MPa is 1767 N.
A screw in the rear cap acts as an adjustable end-stop for the piston. Turning it changes the stroke end position by up to 20 mm, allowing you to shorten the 300 mm nominal stroke without affecting the cylinder's force or speed.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.