Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 950mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke950 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S
The AirTAC SAIJ125X950-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 930 to 950 mm, allowing you to dial back the nominal stroke by up to 20 mm during machine commissioning without swapping the unit. The 125 mm bore delivers substantial thrust, generating 8590 N of push force at 0.7 MPa and reaching 11045 N at 0.9 MPa.
This variant includes a standard carbon steel piston rod and PT tapered port threads (G1/2). The integrated -S magnet supports position sensing via AirTAC CMSE reed and DMSE solid-state switches, which mount directly into the extruded aluminum barrel's dual sensor grooves. It shares the exact mounting dimensions of standard ISO 15552 cylinders but uses a reduced mounting accessory set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 950 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×950 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S Is Used
Large Part Machining Setup
Fine-tunes the 950 mm travel end by up to 20 mm during machine changeover to accommodate different raw casting lengths without adding external mechanical stops.
Heavy Material Diversion
Provides 8590 N of push force at 0.7 MPa to pivot heavy bulk material flows on a conveyor, using the rear adjuster to perfectly time the stroke endpoint.
Automated Assembly Pressing
Delivers up to 11045 N of thrust at 0.9 MPa for pressing bearings into large housings, with the 20 mm adjustment window allowing precise final position calibration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S the Right Cylinder?
Select this 125 mm bore when an application requires high force combined with variable end-stop positioning. If your setup demands less thrust, stepping down to a 100 mm bore yields 5497 N of push force at 0.7 MPa. The rear adjuster is strictly a mechanical stop for end-position tuning; it does not hold the load without live air pressure. For true load-holding without continuous pneumatic pressure, consider the SAIL pneumatic lock or BSAI clamp-lock series.
Because the 950 mm stroke is relatively long, the 32 mm diameter carbon steel rod will experience amplified leverage forces under any side load. An external guide rail is strongly recommended to prevent rod bending and premature seal wear. The operating speed for this bore is 30-500 mm/s, governed by the adjustable air cushions at both ends. To replace an existing ISO 15552 unit, match the 125 mm bore, 950 mm stroke, 20 mm adjustment, G1/2 PT port, desired mounting, and the -S magnet.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X950-20S FAQ
At 0.7 MPa operating pressure, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N. The maximum allowable operating pressure is 1.0 MPa.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from the 950 mm nominal stroke down to 930 mm. This allows precise end-position tuning at commissioning without replacing the cylinder. The adjuster is a travel stop, not a lock, and cannot hold the load without live air pressure.
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