The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X15-20 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, 15mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X15-20 is a 63 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that lets you shorten the stroke end by up to 20 mm without swapping the unit. At 0.5 MPa it delivers 1559 N push and 1402 N pull, suiting short-throw clamping and positioning tasks where the final stop must be dialled in precisely during commissioning.
This model uses a 20 mm piston rod with M16x1.5 male threads, PT1/4 ports, and a 28 mm air cushion for smooth deceleration. The tie-rod body length A(SCJ) is 197 mm, and the adjustable screw sets only the stroke end—it does not alter the cylinder's force rating or speed capability.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X15-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 15 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. |
| ×15 | 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.
Dial in the exact stroke end on a new assembly fixture without removing the cylinder. The 20 mm adjust range lets technicians compensate for tolerance stack-up during initial setup.
Set a precise clamp gap on a welding or gluing jig. The 1559 N push force at 0.5 MPa holds workpieces firmly, and the screw prevents over-travel that could damage parts.
As mechanical end stops wear over time, the rear adjusting screw can be turned to restore the original stroke end position, extending the fixture's service life without new tooling.
Choose the SCJ63X15-20 when you need to fine-tune a short stroke end stop on a fixture or press. If you require more push force, step up to the 80 mm bore (2513 N push at 0.5 MPa); for a lighter, more compact solution the 50 mm bore offers 982 N. When the stroke is fixed and never needs field adjustment, the standard SC63 cylinder is a simpler, lower-cost alternative. For direct replacement, match bore (63 mm), nominal stroke (15 mm), adjust range (-20), PT port thread, and basic mounting. If a built-in magnet is needed for sensors, specify the -S suffix.
Adjustable-stroke checklist
At 0.5 MPa the push force is 1559 N and pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, push reaches 3118 N and pull 2804 N. Because it is a single-rod cylinder, push force is always greater than pull force.
Only if you need the adjustable stroke feature. The SCJ63X15-20 has a longer body to house the adjusting screw (A length 197 mm). Ensure the mounting space accommodates this extra length. The port size, rod thread, and force output are identical to the fixed-stroke SC63.
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