Airtac SCJ40 Standard Cylinder SCJ40X400-100S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-100S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-100S
The SCJ40X400-100S is a 40 mm bore double-acting single-rod cylinder with a generous 100 mm rear-end stroke adjustment, letting you dial in the exact end position on the machine without swapping the cylinder. At 0.5 MPa it delivers 628 N push and 528 N pull, driven by a 16 mm diameter piston rod through PT1/4 ports, with a 21 mm air cushion at each end for smooth deceleration.
This model includes a built-in magnet, so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 400 mm nominal stroke is well within the 1200 mm maximum for this bore, and the body length A(SCJ) is 185 mm plus stroke, making it a compact solution for format-changeover stations where the stop position must be tuned frequently.
Airtac SCJ40 Standard Cylinder SCJ40X400-100S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X400-100S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X400-100S Is Used
Format Changeover Stops
The 100 mm adjustment range lets operators quickly reset the end position for different box or pallet sizes on packaging lines, eliminating the need to swap cylinders or add mechanical stops.
Commissioning & Trial Runs
During machine setup, engineers can fine-tune the push stroke in small increments to find the optimal engagement point for pressing, clamping, or ejecting parts without re-machining any brackets.
Wear Compensation
As tooling or gripper pads wear over thousands of cycles, the rear adjusting screw can be advanced to take up the resulting slack, maintaining consistent contact pressure without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-100S the Right Cylinder?
Step up to a 50 mm bore (982 N push at 0.5 MPa) if the 628 N output of this 40 mm unit is marginal for your load, or drop to a 32 mm bore (402 N) when a smaller, lighter actuator will do. Choose this SCJ adjustable-stroke model over a fixed-stroke SC when you need to fine-tune the stroke end during commissioning, after tooling wear, or between product batches—the rear screw gives you up to 100 mm of field adjustment. For strokes of 400 mm, be mindful of side loading on the 16 mm rod; if the load is not guided, add an external linear guide or consider a guided cylinder to protect the rod bearing and seal. A direct replacement must match the 40 mm bore, 400 mm nominal stroke, 100 mm adjust range, PT thread, and the -S magnet option.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X400-100S FAQ
At 0.5 MPa air pressure the cylinder provides 628 N pushing force and 528 N pulling force. The push force is higher because the single rod reduces the effective piston area on the pull side. At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1280 N.
A rear-cap screw lets you shorten the stroke end by up to 100 mm from the 400 mm nominal maximum. You turn the screw to set the exact stop position. Pick this SCJ model when you need to tune the stroke on the machine—for different products, after maintenance, or to compensate for wear—without changing the cylinder. If your stroke is fixed and never needs field adjustment, the standard SC series is a more economical choice.
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