The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X120-30 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, 120mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X120-30 is an 80 mm bore double-acting single-rod cylinder whose rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm without swapping the unit. It delivers 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa, making it a solid mid-range workhorse for applications that need fine end-position tuning after installation.
This model has a 25 mm diameter piston rod, PT3/8 pneumatic ports, and a 28 mm air cushion at each end for smooth deceleration. The tie-rod body length (A dimension) is 239 mm, and the standard stroke range for the 80 bore extends to 1500 mm. The cylinder runs on 40 µm filtered air at 0.15–1.0 MPa and operates from -20 to +70 °C with its default TPU seals.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X120-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 120 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. |
| ×120 | 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.
A packaging machine uses the 30 mm screw adjustment to shift the pusher end-stop between small and medium carton sizes in under a minute, eliminating mechanical stop changes.
During press-feed setup, technicians adjust the SCJ80's stroke end on the fly to find the exact insertion depth, then lock the screw—no need to swap cylinders or machine hard stops.
A woodworking clamp jig uses the adjustable stroke to take up pad wear over thousands of cycles, maintaining consistent clamping pressure without reprogramming the PLC.
Choose this 80 mm bore when the 63 mm bore's 1559 N push at 0.5 MPa is marginal for your load. If your motion profile is fixed and you never need to tweak the end position, the simpler fixed-stroke SC80X120 cuts cost and lead time. For a drop-in replacement, match the 80 mm bore, 120 mm nominal stroke, 30 mm adjust range, PT3/8 ports, basic mounting, and no magnet.
At 120 mm of stroke, rod buckling is rarely a concern for axial loads, but if the application introduces a side load, add an external linear guide or switch to a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
At 0.5 MPa, push force is 2513 N and pull force is 2268 N (the pull force is lower because the 25 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N.
Yes, provided the old cylinder is also an AirTAC SCJ80 with a 120 mm nominal stroke and a 30 mm adjust range. Match the port thread (PT), mounting style (basic), and magnet option (none) for a bolt-in replacement. Always verify the mounting footprint against the current F-SC80 accessory dimensions.
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