The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-20S 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, 500mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X500-20S is a 63 mm bore double-acting single-rod cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. With a 500 mm nominal stroke and a push force of 1559 N at 0.5 MPa, it is sized for medium-duty positioning and clamping tasks that need fine mechanical end-stop tuning without changing the cylinder.
This model includes a built-in magnet (-S suffix) for direct mounting of CMSG/DMSG/EMSG sensors, enabling rod-position feedback. It uses a 20 mm rod, PT1/4 ports, and an M16x1.5 rod thread, with a 28 mm air cushion for smooth deceleration. The SCJ body length A for this bore is 197 mm, making it slightly longer than a fixed-stroke SC of the same size.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X500-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 500 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. |
| ×500 | 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 500 mm stroke end-stop by up to 20 mm during machine commissioning, eliminating the need to swap cylinders or fabricate external hard stops for precise positioning.
Quickly adjust the push stroke for different product sizes on a packaging line. The 20 mm adjustment range and 1559 N push force handle medium-weight product guides and diverters.
Compensate for tooling or pad wear over time by dialing the rear screw to advance the stroke end, maintaining consistent clamp force and engagement depth in automated assembly.
Choose the SCJ63 bore when the 50 mm bore’s 982 N push force at 0.5 MPa is marginal. If more force is needed, the 80 mm bore provides 2513 N. This adjustable-stroke unit is ideal for commissioning and format changeovers; if the stroke never needs field adjustment, a fixed-stroke SC63X500 is a simpler, lower-cost alternative. For loads that must hold position without air pressure, an external rod lock or pilot-operated check valve is required.
For a 500 mm stroke, assess side-load and rod bending. If the load is not perfectly guided, add an external guide rail or switch to a guided cylinder to protect the rod bearing and seal. A direct replacement must match the 63 mm bore, 500 mm nominal stroke, 20 mm adjust range, PT1/4 ports, basic mount, and the -S magnet option.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, the push force reaches 3118 N. The pull force is lower because the single rod reduces the effective piston area on the return stroke.
Yes, if you need the field-adjustable stroke feature. The SCJ63X500-20S has the same bore, nominal stroke, port size, and mounting footprint as the fixed-stroke SC63, but the rear adjusting screw adds 20 mm of stroke-end reduction. Ensure the slightly longer body length fits your machine and that you match the -S magnet option if sensors are used.
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