This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X75-20S, 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 SIJ125X75-20S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 75mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X75-20S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke75 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X75-20S
- 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 SIJ125X75-20S
The AirTAC SIJ125X75-20S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. An external stop screw lets you trim the extend stroke by up to 20 mm on-site, giving a usable 55-75 mm extension out of the 75 mm nominal maximum. The direct replacement is the SAIJ125X75-20S, matching the interface, force, and mounting.
The SAIJ successor retains the dimensions but adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life. The -S suffix denotes a piston magnet for legacy CS1-B/DS1-B sensors. Remember the stop screw sets end position only; it is not a lock, so use an external rod lock for load holding.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X75-20S |
| Bore size | Ø125 mm |
| Stroke | 75 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 SAIJ125X75-20S 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 SAIJ125X75-20S 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 SIJ125X75-20S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SIJ125X75-20S Is Used
Press Fit Tuning
Allows operators to dial in the exact 55-75 mm extend position for pressing bearings without machining hard stops.
Variable Carton Flaps
Adjusts the extend end-position on the fly to accommodate varying box heights in packaging lines.
Tooling Setup
Fine-tunes the extend stroke during machine changeovers to position end-effectors precisely.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X75-20S with the SAIJ125X75-20S
To replace the discontinued SIJ125X75-20S, order the direct replacement SAIJ125X75-20S, which preserves the G1/2 port, 32 mm rod, and ISO 15552 mounting interfaces (Basic, FA, LB, TC). Choose the 20 mm adjust window if your end-position needs on-site tuning between 55 and 75 mm. Select FA, LB, or TC mounts based on your frame, and ensure the -S magnet is specified if you need switch detection. For this 75 mm stroke, side-load is minimal, but always verify guide alignment. The external stop is not a load lock; for held loads, specify the SAIL or BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X75-20S
- ✓ 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 SIJ125X75-20S FAQ
Yes, the SIJ125X75-20S is discontinued. The direct replacement is the SAIJ125X75-20S. It shares the same ISO 15552 interface, 125 mm bore, 75 mm stroke, 20 mm adjust window, G1/2 port, and mounting options, but features an upgraded piston seal.
The external stop screw provides a 20 mm adjust window, allowing the extend stroke to be shortened from the 75 mm nominal maximum down to 55 mm. The stop sets end position only and is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X75-20S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X75-20S replacement — usually within 7-8 hours.