This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X400-100S, 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 SIJ125X400-100S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X400-100S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 400mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X400-100S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X400-100S
- 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 SIJ125X400-100S
The AirTAC SIJ125X400-100S is a discontinued double-acting double-rod adjustable-stroke ISO 15552 cylinder. An external stop screw lets you trim the extend stroke by up to 100 mm on-site, yielding a usable 300-400 mm stroke from the 400 mm nominal maximum. The direct replacement is the SAIJ125X400-100S, sharing the same interface, force, and mounting.
The SAIJ successor retains the ISO 15552 mounting footprint for direct reuse of FA, LB, and TC brackets, and upgrades the piston seal to two Y-shaped one-way elements for lower start-up pressure and longer life. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. The stop screw sets the end position but is not a load lock; use an external rod lock or SAIL/BSAI variant for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-100S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-100S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X400-100S |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-100S 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 SAIJ125X400-100S 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 SIJ125X400-100S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SIJ125X400-100S Is Used
Variable Press Stroke
Trimming the extend stroke by up to 100 mm on-site allows a 125 mm bore press to accommodate varying material thicknesses without re-mounting the ISO 15552 body.
Adjustable Diverter Arm
A 400 mm diverter can be fine-tuned down to 300 mm to redirect different package sizes on a line, using the external stop screw to set the exact end position.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X400-100S with the SAIJ125X400-100S
To replace the discontinued SIJ125X400-100S, specify SAIJ125X400-100S directly—it is a direct match for the 125 mm bore, 400 mm nominal stroke, 100 mm adjust window, G1/2 port, and M27x2 rod thread. Choose the 100 mm adjust window if your fixture tuning requires trimming up to 100 mm off the extend stroke. The -S magnet supports legacy CS1-B/DS1-B sensors. Because the 400 mm stroke invites rod bending, verify side-load limits and use external guides to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X400-100S
- ✓ 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 SIJ125X400-100S FAQ
Yes, the SIJ125X400-100S is discontinued. The direct replacement is the SAIJ125X400-100S. It shares the same ISO 15552 interface, 125 mm bore, 400 mm stroke, 100 mm adjust window, G1/2 port, and mounting options, but features an upgraded two-piece Y-shaped piston seal for longer life.
The external stop screw provides a 100 mm adjust window, allowing the 400 mm extend stroke to be shortened to 300 mm on-site. The stop sets end position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X400-100S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X400-100S replacement — usually within 7-8 hours.