The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-20 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. Ø63mm bore, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-20 delivers a robust 1559 N of push force at 0.5 MPa, making it a workhorse for medium-duty automation tasks that require field-adjustable end positions. Its rear-mounted adjusting screw provides up to 20 mm of stroke-end reduction, allowing technicians to dial in the exact stopping point during commissioning or after mechanical wear without changing the cylinder body.
Built on a durable tie-rod design with a 20 mm piston rod and M16x1.5 rod thread, this double-acting, single-rod unit handles operating pressures up to 1.0 MPa. The 28 mm air cushion at each end decelerates the piston smoothly, protecting the end caps during high-cycle applications. The PT1/4 ports ensure straightforward pneumatic integration.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 275 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, 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. |
| ×275 | 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.
Fine-tune the end-of-stroke position during initial machine build-out without fabricating custom hard stops. The 20 mm adjustment range absorbs tolerance stack-up in welded frames.
On conveyor diverters or pushers, the screw can be advanced to compensate for gradual wear on contact pads, maintaining precise alignment over thousands of cycles.
Quickly adapt the cylinder stroke for different product sizes on a packaging line by adjusting the rear screw, eliminating the need to swap out the entire actuator.
Choose the SCJ63X275-20 when you need the 63 mm bore's 1559 N push force at 0.5 MPa but require the ability to tweak the stroke end by up to 20 mm on the machine. If you need more force, stepping up to the 80 mm bore provides 2513 N of push. For applications where the stroke is permanently fixed, the standard SC63 series offers the same force profile without the rear adjustment mechanism. This model is a direct replacement for any AirTAC SCJ63 cylinder with a 275 mm nominal stroke and a 20 mm adjustment range, using PT threads and basic mounting.
Adjustable-stroke checklist
A threaded screw in the rear cap acts as an internal stop for the piston. Turning it changes the retracted end position by up to 20 mm, effectively shortening the 275 mm nominal stroke. It does not alter the cylinder's bore size, output force, or operating speed.
It is a direct dimensional match for another AirTAC SCJ63X275-20. It can replace an SC63 fixed-stroke cylinder if you need the adjustment feature, but you must ensure the slightly longer body length (197 mm A-dimension) fits your machine and that the rear screw is accessible.
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