The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X20-20 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, 20mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X20-20 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position by up to 20 mm without swapping the unit. With a 63 mm bore and a 20 mm rod, it delivers 1559 N of push force at 0.5 MPa and can reach 2805 N at the maximum operating pressure of 0.9 MPa.
This model uses a PT1/4 port and an M16x1.5 rod thread, with a 28 mm air cushion at each end for smooth deceleration. The tie-rod body has an SCJ-specific length of 197 mm, slightly longer than a fixed-stroke SC of the same bore to house the rear adjusting screw. It ships with a basic mount and the default TPU seal for standard -20 to +70 °C operation.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X20-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 20 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. |
| ×20 | 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.
Perfect for assembly fixtures where a press-fit depth or insertion distance needs to be dialed in precisely during initial setup, with the 20 mm screw allowing fine resolution without changing the cylinder.
Ideal for packaging lines running multiple product sizes. Operators can quickly adjust the stroke end by up to 20 mm to accommodate different box heights or pallet sizes without mechanical rework.
In high-cycle clamping or pressing operations, the adjustable stroke can be used to take up slack caused by pad or tooling wear over time, maintaining consistent contact force without replacing components.
Choose the SCJ63X20-20 when you need to dial in a precise end position during commissioning or after tooling wear, as the 20 mm adjustment range eliminates the need for external hard stops. If your application requires more force, stepping up to the 80 mm bore provides 2513 N of push at 0.5 MPa; for a lighter, more compact solution, the 50 mm bore offers 982 N. This cylinder is a direct replacement for another AirTAC SCJ63 cylinder with a 20 mm nominal stroke, 20 mm adjustment, PT ports, and basic mounting. For applications needing a fixed, non-adjustable stroke, the standard SC63 series is a simpler alternative. If the load applies significant side forces, consider adding an external guide rail or switching to a guided cylinder, as the single rod is not designed to bear lateral loads.
Adjustable-stroke checklist
At a standard factory air pressure of 0.5 MPa, this 63 mm bore cylinder generates 1559 N of push force and 1402 N of pull force. The push force increases to 2805 N at the maximum operating pressure of 0.9 MPa.
Yes, the SCJ63X20-20 can replace an SC63 with a 20 mm stroke, provided you have space for the slightly longer body (197 mm). The adjustable screw lets you set the exact end position, but the mounting footprint and port locations are compatible with the same SC-series mounting accessories.
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