Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20
The AirTAC SAIJ125X115-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 95-115mm, allowing you to dial back the nominal 115mm stroke by up to 20mm during commissioning without swapping the cylinder. This 125mm bore size generates a substantial 6136N push force at 0.5MPa, scaling up to 11045N at 0.9MPa.
This model is equipped with a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and features PT tapered port threads (G1/2). The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. It supports speeds of 30-500mm/s and uses a mounting interface subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125AX115-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125AX115-20 Is Used
Heavy Press Tuning
Dial in the exact 95-115mm end-stop for high-force pressing operations without machining external stopper blocks.
Product Changeover
Quickly adjust the retract position up to 20mm on packaging lines when switching to a different product size.
Machine Setup
Fine-tune the final end position during commissioning to perfect the kinematics of heavy-duty machinery.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20 the Right Cylinder?
Select this 125mm bore adjustable cylinder when your application requires high thrust and precise end-position tuning on the fly. If you need less force, stepping down to an 80mm bore yields 2513N at 0.5MPa, but the SAIJ125X115-20 is ideal for heavy loads requiring exact 95-115mm travel limits. The rear screw acts as a travel stop and deceleration aid, not a lock; it cannot hold the load without live air. For true load-holding, consider a SAIL or BSAI cylinder.
Because the stroke is 115mm, side-load risks are minimal, but an external guide is still recommended for heavy lateral loads. To match this exact ISO 15552 replacement, specify: 125mm bore, 115mm stroke, 20mm adjustment, PT port threads, the reduced SAIJ mounting set, and no magnet (-S omitted).
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 SAIJ125AX115-20 FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. If you increase the operating pressure to 0.9 MPa, the push force scales up to 11045N.
The rear adjuster screw lets you shorten the effective stroke from its nominal 115mm down to 95mm. This creates a 95-115mm travel window, allowing you to fine-tune the retract end position without adding external stops.
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