The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X150-50STC 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, 150mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X150-50 is a double-acting, single-rod pneumatic cylinder that puts 1559 N of push force at 0.5 MPa behind a 20 mm diameter piston rod. Its defining feature is the rear-cap adjusting screw, which provides up to 50 mm of field-adjustable stroke-end reduction, letting you fine-tune the stopping position without swapping the cylinder or adding external hard stops.
This model ships with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion mount (TC) with the TCM1 bracket (order code F-SC63TC) for pivoting applications. The PT1/4 port and 28 mm air cushion ensure smooth deceleration, while the tie-rod construction keeps the 197 mm body length (A dimension) serviceable.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X150-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 150 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. |
| ×150 | 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.
During machine commissioning, the 50 mm adjust range allows engineers to dial in the exact stroke end position for grippers or pushers without cutting brackets, saving hours of mechanical rework.
On packaging lines that switch between box sizes, the adjustable stroke lets operators quickly reset the push distance for different product widths, minimizing downtime between batches.
In clamping or pressing fixtures, the screw can be advanced over time to compensate for pad wear or material compression, maintaining consistent clamping force without replacing the cylinder.
Step up to the SCJ80 bore if you need more than 1559 N push at 0.5 MPa—the 80 mm bore delivers 2513 N. If your application does not require a field-changeable stroke end, the fixed-stroke SC63 is a simpler, cost-effective alternative. For exact replacement, match the SCJ63 bore, 150 mm nominal stroke, 50 mm adjust range, PT port thread, TC centre trunnion mounting, and the -S magnet option.
At a 150 mm stroke, rod bending is typically not a concern for this 20 mm rod under axial loads, but if the load applies significant side force, consider an external guide rail or a guided cylinder to protect the rod bearings and seal.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder delivers 1559 N pushing force and 1402 N pulling force. The pull force is lower due to the 20 mm rod reducing the effective piston area on the return stroke.
Yes, if the mounting and porting match. The SCJ body is slightly longer to house the adjusting screw. Ensure you have clearance for the rear screw mechanism and that the 50 mm adjustment range covers your stroke reduction needs.
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