The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 450mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X450-50 delivers a nominal 450 mm stroke with a rear-cap adjusting screw that lets you shorten the stroke end by up to 50 mm in the field, giving commissioning engineers a fast way to dial in the exact stop position without swapping the cylinder. Its 63 mm bore generates 1559 N of push force at 0.5 MPa (2805 N at 0.9 MPa), while the 20 mm piston rod and 28 mm air cushion handle deceleration smoothly.
This is a double-acting, single-rod tie-rod cylinder with a PT1/4 port and an M16x1.5 rod thread. The SCJ body length A is 197 mm, slightly longer than the fixed-stroke SC to house the adjustment mechanism. It runs on 40 µm filtered air from 0.15 to 1.0 MPa and operates at speeds of 30-800 mm/s across a -20 to +70 °C temperature range with the standard TPU seal.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X450-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 450 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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.
Operators adjust the stroke end by up to 50 mm to accommodate different box or carton sizes without stopping the line for a cylinder swap, keeping changeover times under a minute.
On a welding fixture, the 50 mm adjust range lets you take up slack as clamping pads wear, maintaining consistent 1559 N clamping force at 0.5 MPa without shimming or replacing the cylinder.
A 450 mm stroke pusher on a conveyor diverter uses the rear screw to fine-tune the gate's closed position, ensuring flush alignment with the rail after installation and during maintenance.
Choose the SCJ63 bore when your application needs roughly 1500-2800 N of push force. If you need more force, step up to the SCJ80 (2513 N push at 0.5 MPa); if you need less, the SCJ50 delivers 982 N. This adjustable-stroke model is ideal when the exact stop position must be tuned on the machine, but if your stroke is fixed and never changes, the standard SC63 is a simpler, lower-cost alternative. For a direct replacement, match the 63 mm bore, 450 mm nominal stroke, 50 mm adjust range, PT1/4 port thread, basic mounting, and no magnet.
At 450 mm of stroke, the piston rod is extended significantly. If the load applies any side force, add an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
The push force is 1559 N at 0.5 MPa, 2182 N at 0.7 MPa, and 2805 N at the 0.9 MPa maximum operating pressure. The pull force is lower because of the single 20 mm rod: 1402 N at 0.5 MPa. The theoretical maximum at 1.0 MPa is 318 kgf of push force.
A rear-cap screw lets you shorten the stroke end by up to 50 mm without dismounting the cylinder. Pick the SCJ when you need to fine-tune the stop position during commissioning, for format changes, or to compensate for wear. If your stroke is fixed and will never need adjustment, the standard SC63 is the more economical choice.
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