The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X120-75 is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal 120 mm stroke, featuring a rear-cap adjusting screw that provides a 75 mm field-adjustable range. This allows you to fine-tune the stroke end position for commissioning or format changes without removing the cylinder. At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, using a 20 mm diameter piston rod.
Built as a durable tie-rod cylinder, the SCJ63X120-75 includes an adjustable air cushion (28 mm length) for smooth deceleration and operates on filtered air from 0.15 to 1.0 MPa. The standard PT1/4 port and M16x1.5 rod thread make integration straightforward. This model is a basic configuration with TPU seals, suitable for ambient temperatures from -20 to +70 °C.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 75 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. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment screw allows technicians to quickly recalibrate the stop position for a pusher arm on a conveyor system after a product changeover, eliminating the need for mechanical shims or hard-stop repositioning.
In clamping fixtures, the adjustable stroke can be gradually extended to compensate for the wear of gripper pads or tooling, maintaining consistent clamping force and cycle time without immediate part replacement.
On a packaging machine, the SCJ63X120-75 can be adjusted to handle different box sizes. The 75 mm range covers multiple formats, and the 1559 N push force at 0.5 MPa is sufficient for folding and sealing medium-weight cardboard.
Choose the SCJ63X120-75 when you need to dial in a precise stroke end point within a 75 mm window, a common requirement for material handling stops or packaging machine adjustments. If your force requirement is lower, stepping down to the 50 mm bore (982 N push at 0.5 MPa) can reduce air consumption. For higher force, the 80 mm bore provides 2513 N of push force. If the stroke does not need field adjustability, a fixed-stroke SC63X120 cylinder is a simpler, more cost-effective alternative.
For replacement, match this cylinder with another SCJ63 of identical 120 mm nominal stroke and 75 mm adjust range, with a PT port. The standard body length A(SCJ) for this bore is 197 mm. For strokes of 120 mm, side-loading is generally not a primary concern, but always ensure the load is guided if any lateral forces are present.
Adjustable-stroke checklist
A threaded screw in the rear cap acts as an internal, adjustable end-stop for the piston. Turning the screw changes the retracted stroke end position by up to 75 mm. This does not alter the cylinder's force or speed; it only shortens the effective stroke from its 120 mm maximum. The push force remains 1559 N and pull force 1402 N at 0.5 MPa.
No, the SCJ63X120-75 is a standard double-acting cylinder and will not hold its position without air pressure. The piston can drift or drop if the directional valve is centered or supply pressure is exhausted. To safely hold a load in place, you must add an external mechanical lock, a rod brake, or a pilot-operated check valve to the circuit.
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