The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X140-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 140mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X140-50S is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal 140 mm stroke, field-adjustable by up to 50 mm via a rear-cap screw. This model delivers a push force of 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa, making it a robust choice for positioning tasks that require fine end-stop tuning.
Equipped with a built-in magnet (-S suffix), it accepts standard CMSG/DMSG/EMSG reed and solid-state sensors directly on the tie-rod barrel for reliable end-of-stroke detection. The cylinder uses a 20 mm diameter piston rod with M16x1.5 threads, PT1/4 ports, and an adjustable air cushion length of 28 mm to decelerate the piston smoothly.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X140-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 140 mm |
| Stroke adjustment | Up to 50 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, 28 mm |
| Max stroke | Up to 1500 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×140 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Field technicians can dial in the exact 140 mm stroke end position with the 50 mm adjustment screw during initial machine setup, eliminating the need to stock multiple fixed-stroke cylinders for trial runs.
On a packaging line, the adjustable stroke allows operators to quickly reset a pusher or gate cylinder's end-stop when switching between product sizes, reducing downtime without mechanical modifications.
In clamping or pressing fixtures, the 50 mm adjustment range can be used to take up slack from worn tooling or workpiece variations over time, maintaining consistent contact force without reprogramming the machine.
Select the SCJ63 when you need push force in the 1559 N (at 0.5 MPa) class and the ability to fine-tune the stroke end position without replacing the cylinder. If your application requires more force, step up to the 80 mm bore SCJ80, which provides 2513 N of push at the same pressure. For a fixed, non-adjustable stroke, the standard SC63 cylinder is a lighter and more compact alternative.
This SCJ63X140-50S is a direct replacement for any AirTAC SCJ63 adjustable-stroke cylinder with a 140 mm nominal stroke, a 50 mm adjustment range, PT ports, a built-in magnet, and basic mounting. For strokes over 300 mm in this bore, consider an external guide rail to protect the 20 mm rod from side-loading and bending.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder provides 1559 N of push force and 1402 N of pull force. At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. The pull force is always lower due to the area of the 20 mm piston rod.
It is a direct dimensional and functional match for an AirTAC SCJ63 with a 140 mm nominal stroke, a 50 mm adjustment range, PT ports, and a magnet. To replace a cylinder from another brand, you must verify the bore, stroke, adjust range, port type, and mounting dimensions match, as the SCJ is a tie-rod design and not an ISO 15552 profile cylinder.
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.