This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAIJ125X500-30S, 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 SIJ125X500-30S
The AirTAC SIJ125 Double Rod Adjustable Cylinder SIJ125X500-30S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø125mm bore and 500mm stroke, G1/2 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAIJ125X500-30S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ125 mm
- Stroke500 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2.0
- StatusDiscontinued → SAIJ125X500-30S
- 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 SIJ125X500-30S
The AirTAC SIJ125X500-30S is a discontinued double-acting double-rod ISO 15552 adjustable-stroke cylinder. A G1/2 port and Ø32 mm rod accompany the 125 mm bore. The external stop screw lets you trim the extend stroke by up to 30 mm on-site, yielding a usable 470-500 mm window from the 500 mm nominal maximum. The stop sets the end position but is not a load lock. The direct replacement is the SAIJ125X500-30S, retaining the same interface, force, and mounting.
Upgrading to the SAIJ brings an upgraded two-piece Y-shaped piston seal for lower start-up pressure, and the broader SAI family introduces lock variants like the SAIL and BSAI absent in the legacy SI line.
Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-30S Technical Specifications
| Model | Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-30S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAIJ125X500-30S |
| Bore size | Ø125 mm |
| Stroke | 500 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 SAIJ125X500-30S 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 SAIJ125X500-30S 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 SIJ125X500-30S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 125 | Bore size in mm. |
| ×500 | 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 SIJ125X500-30S Is Used
Press Fit Tuning
Final insertion depth of bearings requires on-site calibration; trimming the extend stroke by up to 30 mm prevents over-travel without re-machining stops.
Divertor Gate Adjustment
Pneumatic diverters handling varying package sizes use the 470-500 mm stroke window to alter gate extension and accurately route products.
Replacing the Airtac SIJ125 Double Rod Adjustable Cylinder SIJ125X500-30S with the SAIJ125X500-30S
To replace the discontinued SIJ125X500-30S, specify the direct replacement SAIJ125X500-30S, keeping the 30 mm adjust window, 500 mm nominal stroke, and -S magnet for legacy CS1-B/DS1-B switches. If your mechanism requires true load holding on air loss, do not rely on the adjustable stop or the 40 mm air cushions; select a pilot-operated check valve or transition to the SAIL/BSAI lock variant. The ISO 15552 mounting interface allows direct reuse of FA, LB, and TC brackets. Because the 500 mm stroke exceeds 300 mm, verify side-load conditions and support the rod with external guides to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → SAIJ125X500-30S
- ✓ 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 SIJ125X500-30S FAQ
Yes, the AirTAC SIJ125X500-30S is discontinued. The direct replacement is the SAIJ125X500-30S. It shares the identical ISO 15552 interface, 125 mm bore, 500 mm stroke, 30 mm adjust window, G1/2 port, and mounting options, but features an upgraded piston seal.
The external stop screw provides a 30 mm adjust window, allowing the extend stroke to be shortened from 500 mm down to 470 mm. The stop sets position only; it is not a load lock.
Related AirTAC SAI Cylinders
Request a Quote for the SAIJ125X500-30S
Send us the quantity and destination. We confirm price, stock and lead time on the SAIJ125X500-30S replacement — usually within 7-8 hours.