The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X100-20S 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. Ø40mm bore, 100mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X100-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you up to 20 mm of fine-tuning range via the rear-cap screw. With a 40 mm bore and a 16 mm piston rod, it delivers 628 N of push force at 0.5 MPa, making it a strong performer for mid-range positioning tasks where the stroke needs to be dialled in precisely during commissioning or changeover.
This model includes a built-in magnet (-S suffix), so you can mount CMSG, DMSG, or EMSG reed and solid-state sensors directly on the tie-rod barrel for reliable end-of-stroke detection. The standard PT1/4 port, TPU seals, and a body length of 185 mm (A dimension) keep it compact, while the adjustable air cushion at both ends ensures smooth deceleration across the 30-800 mm/s speed range.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X100-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 100 mm |
| Stroke adjustment | Up to 20 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. |
| ×100 | 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 adjustment screw lets technicians fine-tune the end-stop position on a new assembly line without depressurising the system, speeding up the initial machine setup and alignment process.
On a packaging machine, operators can quickly adjust the stroke end to accommodate a new box size, eliminating the need to swap out the cylinder and reducing downtime between production runs.
In a clamping or pressing fixture, the adjustable stroke can be extended slightly over time to compensate for pad wear, maintaining consistent clamping force without replacing the tooling.
Choose the SCJ40X100-20S when you need a 100 mm maximum stroke that can be shortened by up to 20 mm without swapping the cylinder. If your force requirement is lower, stepping down to a 32 mm bore (402 N push at 0.5 MPa) saves space; for higher force, the 50 mm bore provides 982 N push. If the stroke never needs field adjustment, a fixed-stroke SC40X100 is a simpler, slightly shorter alternative.
For a direct replacement, match the 40 mm bore, 100 mm nominal stroke, 20 mm adjustment range, PT1/4 ports, and ensure the replacement also has the -S magnet for sensor compatibility. This basic mount cylinder uses the rod's M12x1.25 male thread for knuckle attachment; if you need a pivoting mount later, the TC centre trunnion kit (F-SC40TC) can be added.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N, due to the area of the 16 mm rod. The maximum push force at the 0.9 MPa operating limit is 1130 N. Always design your application using the pull force if the cylinder is pulling a load.
Yes, the SCJ40X100-20S has the same bore, port, and mounting dimensions as an SC40X100, but the body is slightly longer to house the adjusting screw. Ensure the extra length fits your machine and that you need the 20 mm adjustable stroke feature, as the SCJ is designed for applications requiring field-tunable end positions.
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