The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X275-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X275-40S delivers a nominal 275 mm stroke with a 40 mm field-adjustable range via the rear-cap screw, letting you fine-tune the stroke end without swapping the cylinder. At 0.5 MPa, this single-rod double-acting unit produces 1559 N push and 1402 N pull, driven through a 20 mm rod and PT1/4 ports.
The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG sensors on the tie-rod barrel for reliable end-of-stroke detection. With a 28 mm air cushion, 197 mm base body length, and a maximum standard stroke of 1500 mm, this 63 mm bore cylinder is a versatile workhorse for commissioning and format-change applications.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X275-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 275 mm |
| Stroke adjustment | Up to 40 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. |
| -40 | 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 40 mm adjust range allows engineers to dial in the exact stroke end during machine commissioning without cutting or replacing hard stops, saving hours of setup time on new assembly lines.
Quickly adapt the cylinder stroke for different product sizes on packaging or sorting conveyors. The rear screw adjustment eliminates the need to stock multiple fixed-stroke cylinders for each format.
In clamping or pressing fixtures, the adjustable stroke compensates for tooling wear or material thickness variations over time, maintaining consistent clamp force without reprogramming the machine.
Choose the SCJ63 bore when your load requires roughly 1560 N push at 0.5 MPa. If you need more force, step up to the 80 mm bore which delivers 2513 N push at the same pressure. For a fixed-stroke application without the need for field adjustment, the standard SC63 series is a simpler, cost-effective alternative. When replacing this unit, match the bore (63 mm), nominal stroke (275 mm), adjust range (40 mm), PT port thread, and the -S magnet option.
At a 275 mm stroke, consider external guides or a guided cylinder if the rod faces significant side loads. The 20 mm rod provides good column strength, but unsupported transverse forces can cause premature seal wear or rod bending.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa. The pull force is 1402 N at 0.5 MPa, reduced by the 20 mm rod area. All force values are theoretical; multiply by 0.8 for a dynamic safety factor.
Yes, if your old cylinder is an AirTAC SCJ63 with a 275 mm nominal stroke, a 40 mm adjust range, PT ports, and a magnet. Verify the mounting style matches your bracket; this basic model has no attached bracket, so you would reuse your existing FA, LB, or TC mounting hardware.
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