The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X40-40 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X40-40 is a double-acting, single-rod pneumatic cylinder that puts a 40 mm field-adjustable stroke range at your fingertips. With a 63 mm bore delivering 1559 N of push force at 0.5 MPa, it handles clamping, pressing, and positioning tasks where the end stop needs regular fine-tuning. The rear adjusting screw lets you shorten the nominal 40 mm stroke by up to 40 mm, making machine commissioning and format changeovers far quicker.
Built on the rugged SC tie-rod platform, this cylinder uses a 20 mm diameter piston rod and PT1/4 ports. The adjustable air cushion, with a 28 mm cushion length, decelerates the piston smoothly, while the body length A(SCJ) of 197 mm keeps the package compact. At 0.9 MPa, it pushes with 2805 N, giving you a robust force reserve for demanding industrial sequences.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X40-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 40 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. |
| ×40 | 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.
During machine setup, the 40 mm adjustment screw allows engineers to precisely set the retract end position for part ejection or clamping, eliminating trial-and-error with fixed hard stops.
On packaging lines, quickly adjust the stroke end to accommodate different box heights or product sizes without mechanically reconfiguring the actuator, reducing downtime between batches.
In pressing or staking operations, the screw compensates for tooling wear over time, maintaining consistent press depth and part quality without replacing the cylinder or adding shims.
Choose the SCJ63X40-40 when you need to dial in a precise stroke end without changing the cylinder. If 1559 N of push force is slightly low, stepping up to the 80 mm bore provides 2513 N at the same pressure. For applications where the stroke is permanently fixed, the standard SC63X40 is a simpler, cost-effective alternative. This model is a direct replacement for any AirTAC SCJ63 cylinder with a 40 mm nominal stroke and a 40 mm adjust range, using PT ports and a basic mount. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod; an external guide or a guided cylinder may be necessary to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, it delivers 1559 N pushing and 1402 N pulling. The maximum push force at the 0.9 MPa operating limit is 2805 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
Yes, if you need field adjustability. The SCJ63X40-40 has the same bore, port size (PT1/4), and tie-rod mounting footprint as an SC63. The key difference is the rear adjusting screw, which adds slightly to the overall length but lets you shorten the stroke end by up to 40 mm.
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