This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X220-50S, 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 SIJ125X220-50S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X220-50S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 220mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X220-50S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke220 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X220-50S
- 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 SIJ125X220-50S
The AirTAC SIJ125X220-50S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder with a 125 mm bore and 220 mm maximum stroke. An external stop screw lets you trim the extend stroke by up to 50 mm on-site, giving a usable 170-220 mm window. The direct replacement is the SAIJ125X220-50S, sharing the same interface, force, and mounting.
The SAIJ successor retains the adjustable 40 mm cushions and adds an upgraded two Y-shaped one-way piston seal for lower start-up pressure and longer life. The -S suffix denotes a built-in piston magnet for legacy CS1-B/DS1-B switches. Remember the stop screw sets end position only; it is not a load lock, so use SAIL or an external rod lock for held loads.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X220-50S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X220-50S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X220-50S |
| Bore size | Ø125 mm |
| Stroke | 220 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 SAIJ125X220-50S 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 SAIJ125X220-50S 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 SIJ125X220-50S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×220 | 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 SIJ125X220-50S Is Used
Press Fit Tuning
Allows on-site extend stroke trimming by up to 50 mm to dial in exact press-fit depths for large bearings without machining hard stops.
Variable Pitch Sealing
Adjusts the extend endpoint in packaging lines to accommodate varying carton heights, ensuring consistent sealing pressure across batches.
Mold Alignment Stops
Provides a field-tunable end position for heavy mold closing, letting operators shift the 220 mm nominal stroke down to 170 mm for setup flexibility.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X220-50S with the SAIJ125X220-50S
To replace the discontinued SIJ125X220-50S, order the direct replacement SAIJ125X220-50S, reusing your existing FA, LB, or TC ISO 15552 mounts. The 50 mm adjust window is ideal if your end-of-stroke target needs on-site tuning between 170 and 220 mm. The -S magnet supports legacy CS1-B/DS1-B sensors. For strokes at or above 300 mm, verify side-load limits to prevent guide wear. The external stop never locks the load; for air-loss holding choose SAIL, BSAI, or an external rod lock.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X220-50S
- ✓ 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 SIJ125X220-50S FAQ
Yes, the SIJ125X220-50S is discontinued. The direct replacement is the SAIJ125X220-50S. It shares the same ISO 15552 interface, 125 mm bore, 220 mm stroke, 50 mm adjust window, G1/2 port, and mounting options, but features an upgraded piston seal for longer life.
The external stop screw lets you trim the extend stroke by up to 50 mm on-site (usable 170-220 mm). The stop sets end position only and is not a load lock; speed is 30-500 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X220-50S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X220-50S replacement — usually within 7-8 hours.