This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI50X838H, 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 SI50 Standard Cylinder SI50X838H
The AirTAC SI50 Standard Cylinder SI50X838H is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 838mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI50X838H, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke838 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → SAI50X838H
- 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 SI50 Standard Cylinder SI50X838H
The AirTAC SI50X838H is a discontinued double-acting ISO 15552 profile cylinder with an 838 mm stroke. It delivers 982 N push force at 0.5 MPa, features a 20 mm rod, M16x1.5 thread, G1/4 port, and a Viton H seal for 0-150 C high-temp environments. The direct replacement is the SAI50X838H, matching the exact interface, force, and port.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. This non-magnet SKU cannot take a sensor, unlike the CS1-B/DS1-B switches used on -S models.
Airtac SI50 Standard Cylinder SI50X838H Technical Specifications
| Model | Airtac SI50 Standard Cylinder SI50X838H |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI50X838H |
| Bore size | Ø50 mm |
| Stroke | 838 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI50X838H carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The SAI50X838H produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI50 Standard Cylinder SI50X838H
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×838 | 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 SI50 Standard Cylinder SI50X838H Is Used
High-Temp Ejection
Uses the Viton H 0-150 C seal to push heated parts off a conveyor line over the 838 mm travel distance.
Long-Reach Gating
Actuates a distant safety gate or diverter arm where the 838 mm stroke and 982 N force at 0.5 MPa are required.
Replacing the Airtac SI50 Standard Cylinder SI50X838H with the SAI50X838H
To replace this SI50X838H, order the SAI50X838H. Verify the ISO 15552 mounting interface, 50 mm bore, 838 mm stroke, G1/4 port, and Viton H high-temperature seal. Because this is a non-S SKU, it cannot accept a magnetic sensor. For sizing both ways, neighboring bores (40 mm and 63 mm) offer 628 N and 1559 N push at 0.5 MPa respectively. At 838 mm, side-load and rod-bending risks are high, so use external guides to prevent premature wear. A plain cylinder drifts on air loss; for load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI50X838H
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI50 Standard Cylinder SI50X838H FAQ
Yes, the AirTAC SI50X838H is discontinued. The direct replacement is the SAI50X838H. It is dimensionally interchangeable per ISO 15552, retaining the same 50 mm bore, 838 mm stroke, G1/4 port, and mounting interface.
This double-acting cylinder has a G1/4 air port. It delivers 982 N push and 825 N pull at 0.5 MPa, 1374 N push at 0.7 MPa, and a theoretical maximum of 200 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI50X838H
Send us the quantity and destination. We confirm price, stock and lead time on the SAI50X838H replacement — usually within 7-8 hours.