The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X125-10 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 10 mm range without swapping the cylinder. Ø50mm bore, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X125-10 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke, built around a 50mm bore and a 20mm diameter piston rod. A rear-cap adjusting screw lets you shorten the stroke end by up to 10mm, making it ideal for commissioning fine-tuning or taking up mechanical wear without replacing the cylinder. At a standard 0.5 MPa air supply, it delivers 982 N of push force and 825 N on the pull stroke, giving you a substantial force margin for clamping, pressing, and positioning tasks.
This tie-rod cylinder uses a PT1/4 port and an M16x1.5 rod thread, with a 21mm air cushion at each end to decelerate the piston quietly. The body length A(SCJ) is 194mm, slightly longer than a fixed-stroke SC of the same envelope. The 125mm nominal stroke is well within the 1200mm maximum standard stroke for the 50mm bore, so this is a standard, readily available configuration.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X125-10 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 125 mm |
| Stroke adjustment | Up to 10 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. |
| ×125 | Nominal (maximum) stroke length in mm. |
| -10 | 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 10mm adjustment screw allows technicians to fine-tune the actuator's end-of-stroke position during initial machine setup, eliminating the need to fabricate custom shims or reposition the entire cylinder.
In high-cycle clamping fixtures, the adjustable stroke can be periodically tweaked to compensate for wear on tooling or contact surfaces, maintaining consistent clamp force without replacing the cylinder.
For packaging or assembly lines that run multiple product sizes, the rear screw enables a quick stroke-length changeover, allowing a single cylinder model to handle different product heights or widths.
Choose the SCJ50X125-10 when you need to dial in a precise end position on a 50mm bore platform without adding external hard stops. If your force requirement is lower, stepping down to a 40mm bore (628 N push at 0.5 MPa) saves space and air consumption; for higher force, the 63mm bore provides 1559 N push. The adjustable stroke is a commissioning and maintenance feature—if your application has a fixed, unchanging stroke, the standard SC50X125 is a simpler, more cost-effective choice. For a direct replacement, match the 50mm bore, 125mm nominal stroke, 10mm adjust range, PT port thread, and basic mounting. The SCJ mounting system supports FA front flange, LB foot, or TC centre trunnion accessories from the F-SC50 series if your mounting needs change.
Adjustable-stroke checklist
At 0.5 MPa, this 50mm bore cylinder generates 982 N of push force and 825 N of pull force. The maximum operating force at 0.9 MPa is 1767 N push. The rear adjusting screw changes only the stroke end position, not the cylinder's output force.
Yes, the SCJ50X125-10 is dimensionally compatible with the SC series for the same bore and stroke. The body is slightly longer to house the adjustment mechanism. Ensure the 10mm adjustment range is sufficient for your application and that the mounting and port threads (PT1/4) match your existing setup.
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.