This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X900-30S, 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 SIJ125X900-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X900-30S 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 SAIJ125X900-30S, 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 → SAIJ125X900-30S
- 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 SIJ125X900-30S
The AirTAC SIJ125X900-30S is a double-acting double-rod ISO 15552 adjustable-stroke cylinder, now discontinued and replaced by the SAIJ125X900-30S. Its external stop screw lets you trim the extend stroke by up to 30 mm on-site, giving a usable 870-900 mm window from the 900 mm nominal maximum. The stop sets end position only; it is not a load lock.
The SAIJ direct keeps the ISO 15552 mounting interface, force, and adjust window, but upgrades to a two Y-shaped one-way piston seal for low start-up pressure and long life. A plain cylinder drifts on air loss; use an external rod lock or SAIL/BSAI variant for held loads. The -S suffix provides a piston magnet for legacy CS1-B/DS1-B switches.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X900-30S |
| 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 SAIJ125X900-30S 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 SAIJ125X900-30S 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 SIJ125X900-30S
| 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 SIJ125X900-30S Is Used
Press Tooling Setup
Dialing in the exact extend end position on large press tooling, where the 30 mm on-site stop trim absorbs mechanical tolerance stack-up without remachining stops.
Pallet Positioning Gates
Adjusting the stroke end position for diverter gates handling varying pallet sizes, using the external stop to shorten extend length precisely.
Heavy Load Push-Off
Tuning the extend reach for heavy-duty push-off mechanisms in automated storage systems, ensuring the 125 mm bore force meets the exact transfer point.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X900-30S with the SAIJ125X900-30S
To replace the discontinued SIJ125X900-30S, order the exact direct replacement SAIJ125X900-30S, which preserves the 125 mm bore, 900 mm stroke, 30 mm adjust window, G1/2 port, and ISO 15552 mounting. The 30 mm adjust window is ideal for fine-tuning the extend end position without machining. Mounting options include FA, LB, and TC brackets. The -S suffix includes a piston magnet for position sensing. Because the stroke is 900 mm, you must account for side-load and rod-bending risks, requiring external guides to prevent premature seal wear.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X900-30S
- ✓ 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 SIJ125X900-30S FAQ
Yes, the SIJ125X900-30S is discontinued. The direct replacement is the SAIJ125X900-30S. It shares the same ISO 15552 interface, 125 mm bore, 900 mm stroke, 30 mm adjust window, G1/2 port, and mounting, but adds an upgraded piston seal.
The nominal 900 mm extend stroke can be shortened by up to 30 mm on-site (870-900 mm usable window). The stop sets end position and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X900-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X900-30S replacement — usually within 7-8 hours.