The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-20S 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, 85mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X85-20S is a double-acting, single-rod pneumatic cylinder that puts 1559 N of push force at 0.5 MPa behind a 20 mm diameter rod, giving you the muscle of a standard SC63 in a field-tunable package. Its rear-cap adjusting screw lets you shorten the stroke end by up to 20 mm without swapping the cylinder, while the built-in magnet allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for clean end-of-stroke signalling.
With a 28 mm air cushion at each end and a body length A of 197 mm, this 63 mm bore actuator handles operating pressures from 0.15 to 1.0 MPa across a -20 to +70 °C range. The PT1/4 ports and M16x1.5 rod thread keep it compatible with common pneumatic fittings and rod-end accessories, making it a direct, adjustable replacement for fixed-stroke SC63 cylinders where fine-tuning is needed.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X85-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 85 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. |
| ×85 | 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.
During machine bring-up, adjust the stroke end by up to 20 mm to dial in the exact stop position for a clamp or ejector without machining new stops or reprogramming the controller.
On packaging lines where mechanical end-stops wear over time, the SCJ63X85-20S lets maintenance teams compensate for material loss by simply turning the rear screw, restoring precise positioning.
When a production line switches between product sizes, use the 20 mm adjustment range to shift a pusher or gate's end position quickly, reducing changeover time compared to swapping fixed-stroke cylinders.
Step up to an 80 mm bore SCJ if your load exceeds the SCJ63's 1559 N push at 0.5 MPa; the SCJ80 delivers 2513 N. For purely fixed-stroke applications, a standard SC63 eliminates the adjusting screw and is slightly shorter. The SCJ63X85-20S is a drop-in replacement for any AirTAC SCJ63 with an 85 mm nominal stroke and 20 mm adjust range using PT ports and a basic mount—ensure the magnet option matches if sensor feedback is required. At 85 mm stroke, rod bending is not a primary concern, but for longer strokes always centre the load on the rod axis.
Adjustable-stroke checklist
Because it is a single-rod cylinder, push and pull forces differ. At 0.5 MPa, push force is 1559 N and pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The adjustable stroke screw does not alter these force values.
Yes, if you need field-adjustable stroke. The SCJ63X85-20S has the same bore, rod diameter (20 mm), and port size (PT1/4) as an SC63. The body length A is 197 mm, which is slightly longer than the fixed-stroke version to accommodate the adjusting screw. Ensure your mounting and sensor requirements match.
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