This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X900-40S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 900mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X900-40S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X900-40S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S
The AirTAC SIJ125X900-40S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 900 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 40 mm on-site, yielding a usable 860-900 mm extension. The stop sets the end position; it is not a load lock. The direct replacement is the SAIJ125X900-40S, sharing the same interface, force, and mounting.
The SAIJ successor adopts an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life. This -S model includes a piston magnet for legacy CS1-B/DS1-B switches. Note that plain cylinders drift on air loss; for held loads use an external rod lock or SAIL/BSAI variant. At 900 mm, mind rod bending and use external guides.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X900-40S |
| Bore size | Ø125 mm |
| Stroke | 900 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2.0 |
| 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 standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAIJ125X900-40S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The SAIJ125X900-40S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×900 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S Is Used
Press Tonnage Calibration
Needs field stroke tuning to dial in the exact 860-900 mm extend contact point on varying workpiece heights without re-engineering the fixture.
Variable-Length Diverter
Requires trimming the extend stroke by up to 40 mm on-site to accommodate different package sizes on the fly at the end of a 900 mm run.
Adjustable Pusher Arm
Demands a 900 mm maximum reach with a 40 mm external stop window to fine-tune the final resting position of pallets into a strapper.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S with the SAIJ125X900-40S
To replace the discontinued SIJ125X900-40S, order the exact direct replacement SAIJ125X900-40S, preserving the 125 mm bore, 900 mm stroke, 40 mm adjust window, G1/2 port, and -S magnet. Choose the 40 mm adjust window if your extend stroke needs 860-900 mm of field tuning; the stop screw sets end position but is not a lock. Reuse FA, LB, or TC ISO 15552 mounts. For this 900 mm stroke, verify side-load limits and add external guides to prevent rod bending. The -S magnet supports legacy CS1-B/DS1-B sensors; the SAIJ uses current switches.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X900-40S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-40S FAQ
Yes, the SIJ125X900-40S is discontinued. The direct replacement is the SAIJ125X900-40S. It shares the same ISO 15552 interface, 125 mm bore, 900 mm stroke, 40 mm adjust window, G1/2 port, and mounting, but adds an upgraded piston seal.
The external stop screw window is 40 mm, allowing you to trim the extend stroke from 900 mm down to 860 mm on-site. The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X900-40S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X900-40S replacement — usually within 7-8 hours.