The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø63mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-75 is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly into the rear cap. Its 75 mm adjusting screw lets you dial the end position back from the 300 mm nominal stroke without unmounting the cylinder, making it a practical choice for commissioning trials or format changeovers on packaging and assembly lines. The 20 mm piston rod and PT1/4 ports deliver 1559 N of push force at 0.5 MPa, rising to 2805 N at the 0.9 MPa maximum operating pressure.
Built on the proven SC tie-rod platform, this adjustable-stroke version uses a 28 mm air cushion to decelerate the piston quietly. The body length A(SCJ) is 197 mm, which is slightly longer than the fixed-stroke SC of the same bore to house the rear adjustment mechanism. It operates on 40 µm filtered air from 0.15 to 1.0 MPa and handles ambient temperatures from -20 to +70 °C with its standard TPU seals.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 75 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. |
| -75 | 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 75 mm rear adjustment screw allows engineers to precisely set the stroke end position during machine commissioning without swapping cylinders or fabricating external hard stops.
On packaging lines that handle multiple product sizes, the adjustable stroke lets operators quickly change the pusher or stopper end position to match a new box or tray format.
In clamping or pressing fixtures, the stroke can be incrementally extended over time to compensate for pad wear or tooling compression, maintaining consistent contact force.
Step up to the 80 mm bore SCJ (2513 N push at 0.5 MPa) if this 63 mm unit's 1559 N push force is marginal for your load. For applications where the stroke is fixed and never needs field adjustment, the standard SC63X300 is a simpler, slightly shorter alternative. If the 300 mm stroke creates a risk of rod bending under side loads, pair this cylinder with an external guide rail or consider a guided cylinder.
This model is a direct dimensional replacement for any AirTAC SCJ63X300-75 with basic mounting, PT ports, and no magnet. When ordering a replacement, match the bore, 300 mm nominal stroke, 75 mm adjustment range, and port thread to ensure drop-in fit.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the pull force is lower because the 20 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, the push force reaches 2805 N.
A screw in the rear cap acts as an adjustable end stop for the piston. Turning the screw changes the retracted stroke end position by up to 75 mm, shortening the effective stroke from the 300 mm nominal maximum. It does not adjust the extend position, speed, or output force.
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