The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X80-100 is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly on the machine. Its rear-cap adjusting screw provides up to 100mm of retraction from the 80mm nominal maximum, letting you dial in the exact stop position during commissioning or changeover without swapping the cylinder. With a 16mm piston rod and PT1/4 ports, it delivers a push force of 628N at 0.5MPa.
This tie-rod cylinder measures 185mm in body length (A dimension) and uses an adjustable air cushion to decelerate the piston smoothly. The operating range spans 0.15–1.0MPa, and the standard TPU seals handle temperatures from -20 to +70°C. It is a genuine AirTAC unit, built for repeatable performance in light-to-medium industrial tasks where the stroke must be field-tuned.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 100 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -100 | 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 100mm rear adjuster lets technicians quickly find the optimal stroke end for a new fixture or product without cutting guide rails or machining hard stops, accelerating machine bring-up.
When switching between box sizes or tray depths, the operator adjusts the screw to match the new product height, eliminating the need to stock multiple fixed-stroke cylinders for each format.
In repetitive clamping or pressing, the 628N push force is sufficient for many fixtures, and the adjustable stroke compensates for jaw or pad wear over thousands of cycles, maintaining consistent clamp pressure.
Choose the SCJ40X80-100 when your application benefits from a 40mm bore's 628N push force at 0.5MPa and you need to fine-tune the stroke end by up to 100mm on the fly. If the force is marginal, stepping up to a 50mm bore (SCJ50, 982N push at 0.5MPa) adds capacity; if the 100mm adjustment range is insufficient for your retraction needs, a longer nominal stroke SCJ40 with a smaller adjust range may be a better fit. For a fixed, non-adjustable stroke, the standard SC40 cylinder is the direct alternative.
A direct replacement must match the 40mm bore, 80mm nominal stroke, 100mm adjust range, PT port thread, and basic mounting. This SCJ model accepts the SCJ mounting subset: FA front flange, LB foot, or TC centre trunnion with TCM1 bracket, but no FB flange or CA/CB clevis. The 80mm stroke is well within the 1200mm maximum for this bore, so rod bending is not a primary concern for this configuration.
Adjustable-stroke checklist
At 0.5MPa, the push force is 628N and the pull force is 528N (the difference is due to the single 16mm rod). At the maximum operating pressure of 0.9MPa, the push force reaches 1130N. The theoretical maximum at 1.0MPa is 128kgf.
A rear-cap screw lets you shorten the stroke end by up to 100mm from the 80mm nominal maximum. It does not change the cylinder's force or speed. If you set the screw fully out, it functions at the full 80mm stroke, but it is physically longer than a fixed-stroke SC40. For a non-adjustable application, the standard SC40 is the simpler, more compact choice.
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