Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20
The AirTAC SAIJ125X135-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 115 to 135 mm, allowing you to dial in the exact retract position without swapping out the hardware. In this configuration, the 125 mm bore delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa.
This specific SKU is built with an SUS420J2 stainless steel piston rod (material code A) for superior corrosion and scratch resistance compared to standard carbon steel. It uses PT tapered port threads (G1/2), and because no magnet is specified, it relies solely on its external mechanical stop for position control rather than internal CMSE or DMSE electronic sensors.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / 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 | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20 Is Used
End-Stop Calibration
Dial in the exact 115-135 mm retract position during machine commissioning to perfectly align pressing or clamping forces without machining new hard stops.
Product Changeover
Quickly adapt the effective stroke on a packaging line when switching to a different package size, using the rear screw to accommodate varying material heights.
Heavy Forming Operations
Leverage the 6136 N push force at 0.5 MPa for heavy-duty forming or holding tasks, tuning the travel end to prevent over-travel and tooling damage.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20 the Right Cylinder?
Selecting this 125 mm bore makes sense when a 100 mm bore (offering 3927 N push at 0.5 MPa) cannot generate enough force, but stepping up to a 160 mm bore (10053 N at 0.5 MPa) would be excessive overkill. The adjustable 115-135 mm travel window is ideal for machine setups requiring fine end-position calibration during commissioning or product changeover, which a fixed-stroke SAI cylinder cannot provide without adding external stops.
When ordering a replacement, match the 125 mm bore, 135 mm nominal stroke, 20 mm adjustment range, PT thread type, and SUS420J2 rod material. Because the nominal stroke is 135 mm, you bypass the need for external side-load guides required on longer strokes, though the 32 mm rod diameter already handles high bending loads. Remember that the rear adjuster is a travel stop, not a lock; if you need to hold a load securely without live air pressure, look to the SAIL or BSAI series instead.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-20 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If you increase the pressure to 0.9 MPa, the push force rises to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you trim the effective travel back by up to 20 mm. This creates a usable stroke window of 115 to 135 mm, allowing you to fine-tune the end position at commissioning without changing the cylinder.
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