Airtac SCJ100 Standard Cylinder SCJ100X400-75
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X400-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø100mm bore, 400mm nominal stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Nominal stroke400 mm
- Stroke adjust-75 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X400-75
The SCJ100X400-75 delivers a robust 3927 N push force at 0.5 MPa from its 100 mm bore, making it a workhorse for heavy-duty clamping and pressing tasks. Its defining feature is the rear-cap adjusting screw, which provides up to 75 mm of stroke-end fine-tuning without removing the cylinder, letting you dial in the exact stopping position on the fly.
This double-acting, single-rod cylinder uses a 25 mm diameter rod and PT1/2 ports, with an adjustable air cushion to decelerate the piston smoothly. The tie-rod construction and 245 mm body length (A dimension) offer a rigid, serviceable package, and the 400 mm nominal stroke is well within the 1500 mm maximum for this bore.
Airtac SCJ100 Standard Cylinder SCJ100X400-75 Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X400-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 75 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/2 |
| 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, 29 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.
Theoretical Output Force (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 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 SCJ100 Standard Cylinder SCJ100X400-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ100 Standard Cylinder SCJ100X400-75 Is Used
Format Changeovers
Quickly adjust the end stop for different product sizes on a packaging machine without changing the cylinder or adding external hard stops.
Clamping Stroke Tuning
Dial in the exact clamping depth on a welding fixture to compensate for part tolerance variations or electrode wear over time.
Diverter Gate Positioning
Fine-tune the open and closed positions of a heavy-duty diverter gate on a conveyor line to ensure reliable product routing.
Is the Airtac SCJ100 Standard Cylinder SCJ100X400-75 the Right Cylinder?
For applications needing a bit less force, stepping down to a 80 mm bore provides 2513 N of push at 0.5 MPa, while moving up to a 125 mm bore jumps to 6136 N. This SCJ model is the right choice when you need to fine-tune the stroke end for format changes or wear compensation, unlike a fixed-stroke SC cylinder. If the 400 mm stroke creates a risk of rod buckling under side loads, pair the cylinder with an external guide rail or consider a guided cylinder assembly.
For a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder with a 100 mm bore, 400 mm nominal stroke, and a 75 mm adjustment range. Ensure the port thread is PT and the mounting style is basic, as this model has no magnet or special seals.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ100 Standard Cylinder SCJ100X400-75 FAQ
At the standard 0.5 MPa operating pressure, the push force is 3927 N and the pull force is 3681 N. The maximum push force at 1.0 MPa is 7068 N. Because it is a single-rod cylinder, the push force is always greater than the pull force.
Yes, the SCJ100X400-75 can replace a fixed-stroke SC cylinder of the same bore and nominal stroke, but you gain the ability to shorten the stroke end by up to 75 mm. Ensure the mounting, port thread (PT), and lack of a magnet match your existing setup.
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