The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X120-20STC 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. Ø80mm bore, 120mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X120-20STC is an 80 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the working stroke by up to 20 mm from the nominal 120 mm maximum. Its 25 mm rod diameter and 28 mm air cushion length suit medium-force positioning tasks where the end stop must be dialled in precisely during commissioning or changeover.
At 0.5 MPa this cylinder delivers 2513 N push and 2268 N pull, rising to a robust 4523 N push at 0.9 MPa. The built-in magnet (-S) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for non-contact end-of-stroke sensing, while the centre trunnion mount (TC) with included TCM1 bracket (order code F-SC80TC) supports pivoting motion in a compact footprint.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X120-20STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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 | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 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. |
|---|---|
| 80 | Bore size in mm. |
| ×120 | 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 rear adjusting screw lets commissioning engineers dial in the exact stroke end on a new machine without cutting rods or adding external hard stops, speeding up factory acceptance tests.
When a packaging machine switches between box sizes, the SCJ80X120-20STC can be quickly re-set to a shorter stroke via the rear screw, eliminating mechanical change parts and reducing downtime.
In a pneumatic clamping station, the adjustable stroke compensates for jaw or pad wear over time; the operator simply turns the rear screw to restore full clamping force without replacing the cylinder.
Choose the SCJ80 bore when your application needs roughly 2500 N of push force at standard shop air; if you can work with about 1560 N, the smaller SCJ63 (1559 N push at 0.5 MPa) saves space and weight. For higher loads, the SCJ100 delivers 3927 N push at the same pressure. This SCJ model is the right pick when you need to adjust the stroke end mechanically on the machine—if the stroke is fixed and never changes, the standard SC80 fixed-stroke cylinder is a simpler, lower-cost alternative. For direct replacement, match an SCJ adjustable-stroke cylinder of 80 mm bore, 120 mm nominal stroke, -20 adjust range, PT port thread, centre trunnion mounting, and magnet option.
Adjustable-stroke checklist
At 0.5 MPa air pressure the cylinder produces 2513 N pushing force and 2268 N pulling force. At the maximum operating pressure of 1.0 MPa, push force reaches 5026 N. The push force is higher than the pull force because the single rod reduces the piston area on the return side.
Yes, if your existing cylinder is an AirTAC SCJ80 with a 120 mm nominal stroke, -20 adjustable range, PT ports, centre trunnion mount, and a magnet for sensors. The TC mount uses the F-SC80TC trunnion kit. Always verify the port thread (PT vs G) and mounting style before ordering a replacement.
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