Airtac SCJ100 Standard Cylinder SCJ100X70-20S
The AirTAC Airtac SCJ100 Standard Cylinder SCJ100X70-20S 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. Ø100mm bore, 70mm nominal stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ100 mm
- Nominal stroke70 mm
- Stroke adjust-20 mm
- Port sizePT1/2
- Rod threadM20×1.5
- CushionAdjustable, 29 mm
About the Airtac SCJ100 Standard Cylinder SCJ100X70-20S
The SCJ100X70-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, giving you a 20 mm fine-tuning range on the 70 mm nominal stroke. Its 100 mm bore delivers a substantial 3927 N of push force at 0.5 MPa, rising to 7068 N at 0.9 MPa, making it suitable for heavy pressing, clamping, or positioning tasks where the end stop must be dialed in precisely during commissioning or changeover.
This model includes a built-in magnet (-S suffix), so you can mount CMSG, DMSG, or EMSG reed or solid-state sensors directly onto the tie-rod barrel for non-contact position sensing. The rod diameter is 25 mm with an M20x1.5 thread, and the PT1/2 port supplies the air. The adjustable cushion decelerates the piston smoothly, and the body length A(SCJ) is 245 mm.
Airtac SCJ100 Standard Cylinder SCJ100X70-20S Technical Specifications
| Model | Airtac SCJ100 Standard Cylinder SCJ100X70-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø100 mm |
| Nominal stroke | 70 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 SCJ100X70-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 100 | Bore size in mm. |
| ×70 | 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 SCJ100X70-20S Is Used
Commissioning & Setup
Engineers can fine-tune the final stop position of a heavy pressing tool by up to 20 mm without re-machining any hard stops, speeding up machine commissioning.
Format Changeovers
On packaging lines, the stroke end can be quickly adjusted to accommodate different box or pallet sizes, minimizing downtime between production runs.
Wear Compensation
The adjusting screw can be used to take up mechanical play that develops over time in a linkage or tooling, maintaining precise end-position accuracy without replacing the cylinder.
Is the Airtac SCJ100 Standard Cylinder SCJ100X70-20S the Right Cylinder?
Choose this 100 mm bore when you need force in the 3927 N (push at 0.5 MPa) class. If your load is lighter, stepping down to an 80 mm bore (2513 N push) can reduce air consumption and cost. For higher force demands, the 125 mm bore provides 6136 N of push. The SCJ adjustable-stroke design is the right choice when the machine's end position needs field tweaking—unlike a fixed-stroke SC cylinder. If the load has significant side forces, especially with this 70 mm stroke, use an external guide or switch to a guided cylinder to protect the rod bearing. For a direct replacement, match the 100 mm bore, 70 mm nominal stroke, 20 mm adjust range, PT port thread, and the built-in magnet option.
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 SCJ100X70-20S FAQ
The push force is 3927 N at 0.5 MPa and 7068 N at 0.9 MPa. The pull force is lower due to the single 25 mm rod, providing 3681 N at 0.5 MPa and 6626 N at 0.9 MPa.
Yes, if you need the ability to adjust the stroke end. You must match the 100 mm bore, 70 mm nominal stroke, PT1/2 port, and ensure the SCJ's slightly longer body length fits your mounting space. The built-in magnet must also be matched if your existing setup uses sensors.
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