The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20STC 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, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-20STC is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 20 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston's stop position without removing the cylinder from the machine, ideal for commissioning and format changes. At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, driven by a 20 mm diameter piston rod.
This model is configured with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion (TC) mounting, supplied with the TCM1 bracket (order code F-SC63TC) for pivoting applications. The 63 mm bore body has a length of 197 mm and features an adjustable air cushion of 28 mm for smooth deceleration. It uses PT1/4 ports and an M16x1.5 rod thread, with TPU seals for standard -20 to +70 C operation.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 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. |
| ×75 | 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.
The 20 mm adjusting screw allows engineers to dial in the exact stroke end position during machine commissioning, compensating for assembly tolerances without needing to swap out fixed-stroke cylinders or fabricate custom stops.
On packaging or sorting lines, quickly adjust the cylinder's end stop to accommodate different box sizes or pallet heights. The centre trunnion mount allows the cylinder body to pivot, following the changing angle of a sorting gate.
Fine-tune the clamping depth for varying material thicknesses in a pressing or holding fixture. The 1559 N push force at 0.5 MPa provides a secure grip, and the magnet enables sensor feedback to confirm the clamp is in position.
Select the SCJ63 when your application needs a mid-range force of 1559 N push at 0.5 MPa and the ability to tweak the stroke end by up to 20 mm. If you require more force, step up to the 80 mm bore which provides 2513 N push; for a lighter, more compact solution, the 50 mm bore offers 982 N. This adjustable-stroke model is the right choice over a fixed-stroke SC when your process requires periodic end-position changes, such as adapting to different workpiece thicknesses.
For a direct replacement, match the 63 mm bore, 75 mm nominal stroke, 20 mm adjustable range, PT port thread, centre trunnion (TC) mounting, and the integrated magnet. For strokes of 300 mm or more, evaluate the rod's side-load capacity and consider adding an external guide rail or switching to a guided cylinder to prevent rod bending under high transverse forces.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 63 mm bore cylinder provides a push force of 1559 N and a pull force of 1402 N. The push force is higher because the single rod reduces the effective piston area on the pull stroke. The maximum theoretical force at 1.0 MPa is 2805 N push.
A rear-cap screw lets you shorten the stroke end by up to 20 mm from the 75 mm nominal maximum. It's a mechanical stop, not a force or speed control. Choose this SCJ over a fixed-stroke SC when you need to fine-tune the end position on the machine. For a direct replacement, ensure the new cylinder matches the 63 mm bore, 75 mm stroke, 20 mm adjust range, PT ports, TC mount, and magnet option.
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