The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ63X300-30S is a double-acting, single-rod tie-rod cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows engineers to fine-tune the piston stop position for commissioning, format changes, or wear take-up without replacing the cylinder or adding external hard stops. The built-in magnet enables direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
With a 63 mm bore, this unit delivers 1559 N of push force and 1402 N of pull force at 0.5 MPa, making it a strong mid-range actuator. The 20 mm diameter piston rod features an M16x1.5 male thread, and the cylinder body has a length A of 197 mm. It includes a 28 mm air cushion for smooth deceleration and operates on filtered air from 0.15 to 1.0 MPa.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 30 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. |
| ×300 | Nominal (maximum) stroke length in mm. |
| -30 | 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 30 mm adjusting screw allows precise setting of the actuator's end-stop to match tooling or fixture locations without re-machining mounting brackets.
On packaging or sorting lines, operators can quickly adjust the stroke end for different product sizes by turning the rear screw, minimizing downtime between batch runs.
In clamping or pressing operations, the adjustable stroke can be used to take up mechanical wear in linkages or tooling over time, maintaining consistent contact force and cycle timing.
Select the SCJ63X300-30S when you need a 300 mm nominal stroke with the ability to shorten the end position by up to 30 mm on the machine. If your force requirement is lower, stepping down to a 50 mm bore reduces the push force to 982 N at 0.5 MPa; for higher force, an 80 mm bore provides 2513 N. This model is a direct replacement for any AirTAC SCJ63X300-30S with a PT port and built-in magnet. For fixed-stroke applications where field adjustment is not needed, the standard SC63X300 is a simpler alternative.
At a 300 mm stroke, be mindful of side-loading on the 20 mm rod. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the cylinder produces a push force of 1559 N and a pull force of 1402 N. The pull force is lower due to the area of the 20 mm piston rod. The maximum push force at 0.9 MPa is 2805 N.
Yes, the SCJ63X300-30S is dimensionally compatible with the SC63 series mounting accessories (FA, LB, TC) and has the same port and rod thread. It can replace an SC63X300 if you need the added benefit of a 30 mm field-adjustable stroke end, provided there is clearance for the slightly longer rear adjusting screw housing.
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