Airtac SCJ100 Standard Cylinder SCJ100X25-20H
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X25-20H 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. Ø100mm bore, 25mm nominal stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Nominal stroke25 mm
- Stroke adjust-20 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X25-20H
The AirTAC SCJ100X25-20H is a double-acting, single-rod pneumatic cylinder with a rear adjusting screw that provides up to 20 mm of field-adjustable stroke reduction. This allows precise end-stop tuning for a 25 mm nominal stroke without replacing the cylinder. At 0.5 MPa, it delivers 3927 N of push force and 3681 N of pull force, driven by a 25 mm diameter piston rod through PT1/2 ports.
This model is equipped with Viton (FKM) seals, designated by the 'H' suffix, extending the operating temperature range from 0 to +150°C for demanding hot environments. The tie-rod construction incorporates an adjustable air cushion for smooth deceleration. The body length for this 100mm bore SCJ series is 245 mm, making it a compact solution for applications requiring high force and fine stroke adjustment.
Airtac SCJ100 Standard Cylinder SCJ100X25-20H Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X25-20H |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 25 mm |
| Stroke adjustment | Up to 20 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 SCJ100X25-20H
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×25 | 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.
Where the Airtac SCJ100 Standard Cylinder SCJ100X25-20H Is Used
End-Stop Calibration
Fine-tune the retract stroke end position during machine commissioning to perfectly align tooling or stops, using the 20 mm adjustment range to dial in the exact position required.
High-Temp Clamping
Provides consistent, adjustable clamping force in heated presses or thermoforming tools, where the Viton seals reliably operate at temperatures up to 150°C.
Wear Compensation
Adjust the stroke end to compensate for wear on contact surfaces or tooling over time, maintaining precise machine cycles without replacing the cylinder or adding external shims.
Is the Airtac SCJ100 Standard Cylinder SCJ100X25-20H the Right Cylinder?
Choose the SCJ100X25-20H when you need substantial clamping or pressing force with the ability to fine-tune the stroke end position on the machine. If 3927 N of push force at 0.5 MPa is insufficient, stepping up to the 125 mm bore provides 6136 N. For a lighter, more compact solution, the 80 mm bore offers 2513 N. This adjustable-stroke model is ideal for commissioning and format changes; if a fixed stroke is sufficient, the standard SC series is a simpler alternative. For strokes of 300 mm or more, evaluate side-loading on the 25 mm rod and consider an external guide.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ100X25-20H FAQ
A screw in the rear cap limits the piston's retraction, allowing you to shorten the stroke end by up to 20 mm. The 25 mm is the maximum nominal stroke. This adjustment is mechanical and does not change the cylinder's force output, which is 3927 N push and 3681 N pull at 0.5 MPa.
A direct replacement must match the SCJ adjustable-stroke series with a 100 mm bore, 25 mm nominal stroke, and a 20 mm adjustment range. It must also have PT1/2 ports and Viton seals (suffix 'H'). Mounting accessories like FA, LB, or TC trunnion must be ordered separately using the F-SC100 code pattern.
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