The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-20 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-20 is a double-acting, single-rod pneumatic cylinder with a 20 mm rear adjusting screw, letting you fine-tune the stroke end position on the fly during commissioning or format changes. With a 63 mm bore and 400 mm nominal stroke, it delivers 1559 N of push force at 0.5 MPa and up to 2805 N at the maximum operating pressure of 0.9 MPa, suiting medium-force positioning and clamping tasks.
This tie-rod cylinder uses a 20 mm piston rod, PT1/4 ports, and an M16x1.5 rod thread, with a 28 mm air cushion at each end to decelerate the piston smoothly. The body length A(SCJ) is 197 mm, and the adjustable screw shortens the stroke end by up to 20 mm without altering the cylinder's force rating or requiring external hard stops.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 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. |
| ×400 | 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.
The 20 mm rear screw lets technicians dial in the exact stroke end position during machine commissioning without swapping cylinders or machining custom stops, saving hours of downtime.
On packaging or assembly lines running multiple product sizes, operators can quickly adjust the cylinder stroke to match a new format, eliminating the need for a full cylinder changeout.
In clamping or pressing fixtures where tooling wears over time, the adjustable stroke end compensates for material loss, maintaining consistent contact pressure without reprogramming the machine.
Choose the SCJ63X400-20 when you need to dial in a precise stroke end within a 20 mm window on a 400 mm nominal stroke. If 1559 N of push force at 0.5 MPa is insufficient, step up to the 80 mm bore (2513 N push at 0.5 MPa); if the force is excessive for a lighter fixture, the 50 mm bore provides 982 N. For a fixed, non-adjustable stroke, the standard SC63X400 is a simpler alternative. A direct replacement must match the 63 mm bore, 400 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting.
At a 400 mm stroke, side-loading can cause rod deflection or premature seal wear. If the load is not guided externally, pair the cylinder with a linear guide or consider a guided cylinder to protect the rod and bearing.
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 0.9 MPa, push force reaches 2805 N. The pull force is lower because the piston rod reduces the effective area on the return stroke.
Yes, if you need the 20 mm field-adjustable stroke-end feature. The SCJ shares the same bore, rod diameter, port size, and mounting accessories as the SC. Ensure the slightly longer body length of the SCJ fits your machine envelope and that the adjusting screw is accessible.
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