The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-20STC 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X50-20STC is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw gives you up to 20 mm of adjustment, so commissioning staff can dial in the exact stop position without swapping the cylinder or fabricating external hard stops. The 63 mm bore delivers 1559 N of push force at 0.5 MPa, making it a strong mid-range actuator for pressing, clamping and positioning tasks.
This model is factory-configured with a built-in magnet (-S) and a centre trunnion mounting (-TC). The magnet lets you clip CMSG or DMSG sensors directly onto the tie-rod barrel for end-of-stroke or mid-stroke position feedback. The TC trunnion, supplied with the TCM1 bracket, allows the cylinder to pivot, absorbing any slight misalignment in swinging or articulating linkages. With a 20 mm piston rod, M16x1.5 rod thread and PT1/4 ports, it shares the same robust tie-rod construction as the fixed-stroke SC series, just with an adjustable rear head.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 50 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. |
| ×50 | 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.
Fine-tune the retract stop position during machine commissioning. The 20 mm adjustment screw lets technicians dial in the exact stroke end for part contact without iterative cylinder swaps.
Quickly adapt to different product sizes on packaging or assembly lines. Operators can adjust the stroke end to handle a new box height or component thickness in seconds.
Take up mechanical play or tooling wear over time. The adjustable rear head lets you extend the effective stroke slightly to maintain consistent pressing or clamping force.
Step up to an 80 mm bore SCJ if your application needs more than 1559 N of push force at 0.5 MPa; the SCJ80 series provides 2513 N at the same pressure. If the stroke never needs field adjustment, the simpler fixed-stroke SC63 is a more economical choice. For applications requiring a guided load to prevent rod rotation, consider an SCJ with external guide rods or a dedicated guided cylinder.
A direct replacement must match the 63 mm bore, 50 mm nominal stroke, 20 mm adjustment range, PT port thread, centre trunnion mount (F-SC63TC) and the magnet option. The mounting kit code is F-SC63TC, which includes the TCM1 bracket. Ensure the replacement cylinder's adjustable range covers your current set-point.
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 1.0 MPa, the theoretical push force is 3118 N. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the rod area.
Yes, if the adjustable stroke feature is acceptable. The SCJ63X50-20STC has the same 63 mm bore, 50 mm maximum stroke and tie-rod body as an SC63X50, but the rear head is longer to house the adjusting screw. You must ensure the extra body length (A=197 mm) fits your machine and that the centre trunnion mount (F-SC63TC) and magnet sensor match your existing setup.
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