The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-20S 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, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X450-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 1559 N of push force at 0.5 MPa. The rear-cap adjusting screw provides up to 20 mm of stroke shortening, letting you fine-tune the end position during commissioning or changeovers without swapping the cylinder. Its 20 mm rod and PT1/4 ports handle mid-range automation tasks, while the built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
This 63 mm bore model uses a tie-rod construction with an adjustable air cushion for smooth deceleration. The body length A(SCJ) is 197 mm, and the cylinder operates from 0.15 to 1.0 MPa. At the maximum operating pressure of 0.9 MPa, it generates 2805 N of push force, making it a versatile workhorse for positioning and clamping applications where the final stroke length needs to be dialed in precisely on the machine.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 450 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. |
| ×450 | 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 adjustment screw lets technicians dial in the exact stop position for a pusher or stop gate during initial machine setup, eliminating the need to shim or reposition the cylinder body.
On packaging lines, quickly adjust the stroke end to accommodate different box or product sizes. The 1559 N push force at 0.5 MPa is sufficient for diverting or stopping medium-weight packages.
The built-in magnet works with CMSG/DMSG sensors to confirm full extension, a critical feature in automated clamping fixtures where the stroke end has been fine-tuned for a specific part family.
Choose the SCJ63X450-20S when your application requires a 450 mm nominal stroke with the ability to trim the end position by up to 20 mm in the field. If you need more force, stepping up to an 80 mm bore provides 2513 N of push at 0.5 MPa; for a lighter, more compact solution, the 50 mm bore delivers 982 N. This model is ideal when you need sensor feedback, thanks to the integrated magnet. For a fixed, non-adjustable stroke, the standard SC series is a more economical choice. A direct replacement must match the 63 mm bore, 450 mm nominal stroke, 20 mm adjust range, PT ports, and the -S magnet option.
Given the 450 mm stroke length, be mindful of side-loading and potential rod buckling. If the load is not perfectly guided, consider adding an external guide rail or switching to a guided cylinder assembly to protect the rod bearings and ensure long service life.
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, the push force reaches 2805 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A rear-cap screw lets you shorten the stroke end by up to 20 mm from the 450 mm nominal maximum. It does not change the cylinder's force or speed. You can replace a fixed-stroke SC with this SCJ if the bore, port thread (PT), and mounting match, and you have space for the slightly longer SCJ body length A(SCJ) of 197 mm.
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