The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X70-20S 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, 70mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X70-20S is an 80 mm bore double-acting single-rod cylinder that lets you fine-tune the stroke end position on the machine by up to 20 mm via the rear adjusting screw. With a 25 mm piston rod and PT3/8 ports, it delivers 2513 N of push force at 0.5 MPa and 4523 N at 0.9 MPa, suiting medium-force clamping, pressing, and positioning tasks where the stroke needs quick, tool-free adjustment.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for end-of-stroke sensing. The body length A is 239 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. The stroke end is set by the rear screw within the 20 mm range—the nominal 70 mm stroke remains the maximum.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X70-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 70 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. |
| ×70 | 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.
Fine-tune the end position of a stop gate or pusher during line commissioning without fabricating new brackets or shims. The 20 mm rear screw adjustment lets technicians dial in the exact stroke end on the fly.
Quickly adjust a diverter or reject station stroke when switching between product sizes on a packaging line. The SCJ80X70-20S eliminates the need to swap cylinders or mechanical stops for small stroke changes.
The built-in magnet allows CMSG/DMSG sensors to confirm full clamp extension. Adjust the stroke end to set precise clamp pressure depth on a gluing or assembly fixture, with 4523 N of force available at 0.9 MPa.
Choose the SCJ80 when you need around 2513 N of push force at standard plant pressure. If your load is lighter, stepping down to the 63 mm bore (1559 N push at 0.5 MPa) saves air and space; for heavier work, the 100 mm bore delivers 3927 N. The SCJ is the right pick when you need to dial in the stroke end on the machine—during commissioning, format changes, or to take up wear—without swapping cylinders. If the stroke is fixed and never needs field adjustment, the standard SC80 fixed-stroke cylinder is a simpler, lower-cost alternative.
For a direct replacement, match an AirTAC SCJ cylinder of the same 80 mm bore, 70 mm nominal stroke, 20 mm adjust range, PT3/8 ports, basic mounting, and built-in magnet (-S). At 70 mm stroke, rod bending from side load is not a primary concern, but always guide the load externally if any lateral force is present.
Adjustable-stroke checklist
The output force depends only on bore and air pressure, not the stroke adjustment. At 0.5 MPa, it produces 2513 N push and 2268 N pull (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.
The SCJ80 is an adjustable-stroke version of the SC80. It can replace an SC80 if you need the stroke-end adjustment feature and the slightly longer body length (239 mm A-dimension for SCJ) fits your machine. You must match the 80 mm bore, 70 mm nominal stroke, PT3/8 ports, and the -S magnet option. The mounting accessories (FA, LB, TC) are shared between SC and SCJ.
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