The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X450-75 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw lets you shorten the effective stroke by up to 75 mm from the 450 mm nominal maximum, providing 1559 N of push force at 0.5 MPa without swapping the cylinder body.
This 63 mm bore model uses a 20 mm diameter piston rod, PT1/4 ports, and an M16x1.5 rod thread for easy tooling attachment. Its 28 mm air cushion decelerates the piston quietly at stroke end, and the tie-rod construction keeps the 197 mm body length serviceable in demanding industrial settings.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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 75 mm adjustment range allows engineers to dial in the exact stroke end position on a new machine without fabricating custom mechanical stops, accelerating factory acceptance testing.
On packaging lines, the stroke can be quickly reset to accommodate different box sizes or pallet patterns, minimizing downtime during format changes with a simple screw adjustment.
In clamping or pressing fixtures, the adjustable screw can be advanced to take up for tooling wear or material thickness variations over time, maintaining consistent clamp force without replacing the cylinder.
Choose the SCJ63 when you need to fine-tune a stroke end position during commissioning or format changes, delivering 1559 N push at 0.5 MPa. If your force requirement drops, the 50 mm bore SCJ50 offers 982 N push, saving space and air consumption. For higher force, step up to the 80 mm bore SCJ80 at 2513 N push.
At a 450 mm stroke, rod deflection under side load is a real concern. If the load is not guided externally, consider pairing this cylinder with a linear guide or switching to a guided cylinder to prevent rod bending and premature seal wear. For direct replacement, match the 63 mm bore, 450 mm nominal stroke, 75 mm adjust range, PT port thread, and basic mounting configuration of another AirTAC SCJ63X450-75.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 63 mm bore cylinder generates 1559 N of push force and 1402 N of pull force. The maximum push force at 0.9 MPa is 2805 N. The pull force is lower due to the area of the 20 mm piston rod.
Only if you need the adjustable stroke feature. The SCJ63X450-75 has a longer body (197 mm) than a fixed-stroke SC63 to house the adjusting screw. It is a direct dimensional replacement only for another AirTAC SCJ63 with the same 450 mm nominal stroke, 75 mm adjust range, and PT port thread.
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