The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X70-30S 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. Ø80mm bore, 70mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X70-30S is an 80 mm bore, single-rod double-acting cylinder with a rear adjusting screw that provides up to 30 mm of field-adjustable stroke-end retraction. This lets you fine-tune the piston stop position without changing the cylinder body or adding external hard stops. The built-in magnet (S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
At 0.5 MPa, the cylinder delivers 2513 N of push force and 2268 N of pull force, with a 25 mm diameter piston rod and PT3/8 ports. The 28 mm air cushion decelerates the piston smoothly at each end of travel. Its body length A is 239 mm, making it a compact solution for machinery where stroke length must be dialled in precisely during commissioning or changeover.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X70-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 30 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. |
| ×70 | 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.
Dial in the exact stroke end position during machine commissioning without swapping cylinders or machining custom stops. The 30 mm adjustment range allows for fine-tuning of actuator travel to match tooling or workpiece variations.
Quickly adapt to different product sizes on packaging or assembly lines. The rear screw adjusts the stroke end to accommodate new box heights or pallet dimensions, reducing downtime between production runs.
Take up mechanical wear in linkages or tooling over time by slightly extending the effective stroke. The screw adjustment compensates for component play without requiring a full cylinder replacement.
Step up to the SCJ100 bore for 3927 N of push force at the same 0.5 MPa if your load exceeds the 2513 N capability of this 80 mm unit. For lighter, faster applications, the SCJ63 bore provides 1559 N push. If your application does not require stroke adjustability, the fixed-stroke SC80 cylinder offers the same force in a slightly shorter body. This SCJ80X70-30S is a direct replacement for any AirTAC SCJ80 cylinder with a 70 mm nominal stroke, 30 mm adjust range, PT3/8 ports, and a built-in magnet. For strokes of 300 mm or longer, evaluate side-loading on the 25 mm rod and consider an external guide rail or a guided cylinder to prevent rod bending.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N. At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N. The pull force is lower because the piston rod reduces the effective area on the return stroke.
A screw in the rear cap sets the stroke end position. You can shorten the nominal 70 mm stroke by up to 30 mm. This adjusts the piston stop point, not the force or speed. It is ideal for fine-tuning travel during setup or changeovers without replacing the cylinder.
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