AirTAC SIL125 End-Lock ISO Cylinder, 125 mm Bore
Every AirTAC SIL125 configuration on one page: 65 stock order codes with strokes from 25 to 1150 mm, 5 mounting styles and magnet versions, from $302.86. Pick a stroke, mounting and version to see the exact order code and price. Front-lock (F) and rear-lock (B) versions are listed separately. Discontinued series: orders ship as the SAILF/SAILB with the same code.
This combination is not a stock order code. Request a quote and we will confirm availability and price.
- 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 SIL125
Discontinued: AirTAC has replaced the SILF/SILB series with the SAILF/SAILB series. Every SILF/SILB code on this page is supplied as the current SAILF/SAILB with the same code after the prefix, for example SILF125X25 ships as SAILF125X25. The specifications on this page are those of the SAILF/SAILB you receive. Older hyphenated codes are the same code: SILF125X50-S ships as SAILF125X50S.
The AirTAC SIL125 is a double-acting end-lock ISO 15552 cylinder with a 125 mm bore and a 32 mm piston rod. At 0.5 MPa it pushes 6136 N and pulls 5734 N; at 0.7 MPa that rises to 8590 N push and 8027 N pull. Force depends on bore and pressure only, so every stroke on this page gives the same output.
All SIL125 versions share 1/2" air ports, an M27×2 rod thread and adjustable air cushions. The cylinder runs on filtered air between 0.15 and 1.0 MPa (proof 1.5 MPa), from -20 to +70 °C, at 30 to 800 mm/s. This page lists 65 stock order codes with strokes from 25 to 1150 mm; catalog standard strokes run up to 1500 mm.
The SIL125 adds a mechanical lock to one end cover: SILF codes have it in the front (rod-end) cover and SILB codes in the rear cover. The lock holds the piston at that end of the stroke while the port on the lock side is exhausted, so the rod does not move if the air supply is lost; air on that port releases it automatically, and a hand lever releases it manually. The catalog gives no holding-force figure for the lock.
SIL125 Technical Specifications
| Bore size | Ø125 mm |
|---|---|
| Stock strokes | 25 – 1150 mm |
| Catalog standard stroke | up to 1500 mm (longer on request) |
| Acting type | Double acting, with end lock |
| Lock position | Front cover (F) or rear cover (B) |
| Lock release | Automatic (air on the lock-side port) or manual lever |
| Port size | 1/2" (PT standard) |
| Piston rod / rod thread | Ø32 mm / M27×2 |
| Fluid | Air (filtered by 40 µm 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 air cushions |
Source: AirTAC Products Catalog 2026A (PDF01-P0376/P0377), SAIL specifications and ordering code; body as SAI. The SILF/SILB series is discontinued; these are the SAILF/SAILB specifications.
Theoretical output force (Ø125 mm)
| Pressure | Push | Pull |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | 8027 N |
Push = pressure × bore area; pull subtracts the Ø32 mm rod area. Usable force is lower because of friction and back-pressure.
How the SIL125 Order Code Is Built
| SIL | Series: SI ISO 15552 cylinder with end lock |
|---|---|
| F / B | Lock position: F = front (rod-end) cover, B = rear cover |
| 125 | Bore in mm |
| X100 | Stroke in mm |
| S | Built-in magnet for position sensors (blank = none) |
| LB / FA / CB / TC / FTC | Mounting: LB foot, FA front flange, CB double clevis, TC center trunnion, FTC front trunnion |
| G | Port thread: G = G (BSPP), blank = PT |
All AirTAC SIL125 Order Codes (65)
Each order code links to its own datasheet page. Use Select to load it into the configurator above.
| Order code | Stroke (mm) | Mounting | Magnet · Thread | Price | Select |
|---|---|---|---|---|---|
| SILF125X25 | 25 mm | Basic (no mounting) | Front lock (F) · - · PT | $302.86 | |
| SILF125X25S | 25 mm | Basic (no mounting) | Front lock (F) · S · PT | $308.90 | |
| SILF125X40S | 40 mm | Basic (no mounting) | Front lock (F) · S · PT | $313.35 | |
| SILF125X50 | 50 mm | Basic (no mounting) | Front lock (F) · - · PT | $307.30 | |
| SILF125X50-S | 50 mm | Basic (no mounting) | Front lock (F) · S · PT | $313.51 | |
| SILF125X60S | 60 mm | Basic (no mounting) | Front lock (F) · S · PT | $320.79 | |
| SILF125X70 | 70 mm | Basic (no mounting) | Front lock (F) · - · PT | $314.75 | |
| SILF125X75 | 75 mm | Basic (no mounting) | Front lock (F) · - · PT | $314.75 | |
| SILF125X75S | 75 mm | Basic (no mounting) | Front lock (F) · S · PT | $320.79 | |
| SILF125X80 | 80 mm | Basic (no mounting) | Front lock (F) · - · PT | $322.40 | |
| SILF125X80S | 80 mm | Basic (no mounting) | Front lock (F) · S · PT | $328.45 | |
| SILF125X100 | 100 mm | Basic (no mounting) | Front lock (F) · - · PT | $322.40 | |
| SILF125X100-S | 100 mm | Basic (no mounting) | Front lock (F) · S · PT | $328.50 | |
| SILF125X100-TC | 100 mm | TC center trunnion | Front lock (F) · - · PT | $394.67 | |
| SILF125X125 | 125 mm | Basic (no mounting) | Front lock (F) · - · PT | $329.84 | |
| SILF125X125S | 125 mm | Basic (no mounting) | Front lock (F) · S · PT | $335.89 | |
| SILB125X130-S | 130 mm | Basic (no mounting) | Rear lock (B) · S · PT | $343.49 | |
| SILF125X150 | 150 mm | Basic (no mounting) | Front lock (F) · - · PT | $337.29 | |
| SILF125X150-S | 150 mm | Basic (no mounting) | Front lock (F) · S · PT | $343.49 | |
| SILF125X160 | 160 mm | Basic (no mounting) | Front lock (F) · - · PT | $344.99 | |
| SILF125X160S | 160 mm | Basic (no mounting) | Front lock (F) · S · PT | $351.04 | |
| SILF125X160FTC | 160 mm | FTC front trunnion | Front lock (F) · - · PT | $410.13 | |
| SILF125X170 | 170 mm | Basic (no mounting) | Front lock (F) · - · PT | $344.99 | |
| SILF125X175 | 175 mm | Basic (no mounting) | Front lock (F) · - · PT | $344.99 | |
| SILF125X175S | 175 mm | Basic (no mounting) | Front lock (F) · S · PT | $351.04 | |
| SILF125X200 | 200 mm | Basic (no mounting) | Front lock (F) · - · PT | $352.44 | |
| SILF125X200-S | 200 mm | Basic (no mounting) | Front lock (F) · S · PT | $358.48 | |
| SILF125X200STC | 200 mm | TC center trunnion | Front lock (F) · S · PT | $430.60 | |
| SILF125X225S | 225 mm | Basic (no mounting) | Front lock (F) · S · PT | $365.93 | |
| SILF125X230S | 230 mm | Basic (no mounting) | Front lock (F) · S · PT | $373.37 | |
| SILF125X250 | 250 mm | Basic (no mounting) | Front lock (F) · - · PT | $367.32 | |
| SILF125X250-S | 250 mm | Basic (no mounting) | Front lock (F) · S · PT | $373.48 | |
| SILF125X270S | 270 mm | Basic (no mounting) | Front lock (F) · S · PT | $388.47 | |
| SILF125X300 | 300 mm | Basic (no mounting) | Front lock (F) · - · PT | $382.42 | |
| SILF125X300-S | 300 mm | Basic (no mounting) | Front lock (F) · S · PT | $388.47 | |
| SILF125X300SLB | 300 mm | LB foot | Front lock (F) · S · PT | $435.00 | |
| SILF125X350 | 350 mm | Basic (no mounting) | Front lock (F) · - · PT | $397.57 | |
| SILF125X350S | 350 mm | Basic (no mounting) | Front lock (F) · S · PT | $403.62 | |
| SILF125X400 | 400 mm | Basic (no mounting) | Front lock (F) · - · PT | $412.45 | |
| SILF125X400-S | 400 mm | Basic (no mounting) | Front lock (F) · S · PT | $418.45 | |
| SILF125X410-CB | 410 mm | CB double clevis | Front lock (F) · - · PT | $481.01 | |
| SILF125X450 | 450 mm | Basic (no mounting) | Front lock (F) · - · PT | $427.55 | |
| SILF125X450S | 450 mm | Basic (no mounting) | Front lock (F) · S · PT | $433.60 | |
| SILF125X465-S | 465 mm | Basic (no mounting) | Front lock (F) · S · PT | $448.44 | |
| SILF125X480-S | 480 mm | Basic (no mounting) | Front lock (F) · S · PT | $448.44 | |
| SILF125X500 | 500 mm | Basic (no mounting) | Front lock (F) · - · PT | $442.44 | |
| SILF125X500-S | 500 mm | Basic (no mounting) | Front lock (F) · S · PT | $448.44 | |
| SILF125X500SLB | 500 mm | LB foot | Front lock (F) · S · PT | $495.02 | |
| SILF125X550 | 550 mm | Basic (no mounting) | Front lock (F) · - · PT | $474.34 | |
| SILF125X550SFA | 550 mm | FA front flange | Front lock (F) · S · PT | $526.91 | |
| SILF125X600 | 600 mm | Basic (no mounting) | Front lock (F) · - · PT | $474.34 | |
| SILF125X600S | 600 mm | Basic (no mounting) | Front lock (F) · S · PT | $480.38 | |
| SILF125X600STC | 600 mm | TC center trunnion | Front lock (F) · S · PT | $552.50 | |
| SILF125X625S | 625 mm | Basic (no mounting) | Front lock (F) · S · PT | $512.23 | |
| SILF125X650S | 650 mm | Basic (no mounting) | Front lock (F) · S · PT | $512.23 | |
| SILF125X700 | 700 mm | Basic (no mounting) | Front lock (F) · - · PT | $506.18 | |
| SILF125X700-S | 700 mm | Basic (no mounting) | Front lock (F) · S · PT | $512.02 | |
| SILF125X700-TC | 700 mm | TC center trunnion | Front lock (F) · - · PT | $813.42 | |
| SILF125X800 | 800 mm | Basic (no mounting) | Front lock (F) · - · PT | $538.08 | |
| SILF125X800-S | 800 mm | Basic (no mounting) | Front lock (F) · S · PT | $544.08 | |
| SILF125X900 | 900 mm | Basic (no mounting) | Front lock (F) · - · PT | $569.93 | |
| SILF125X900-S | 900 mm | Basic (no mounting) | Front lock (F) · S · PT | $576.13 | |
| SILF125X1000 | 1000 mm | Basic (no mounting) | Front lock (F) · - · PT | $601.57 | |
| SILF125X1000S | 1000 mm | Basic (no mounting) | Front lock (F) · S · PT | $607.61 | |
| SILF125X1150S | 1150 mm | Basic (no mounting) | Front lock (F) · S · PT | $674.15 |
Need a combination that is not listed? Request a quote.
Where the SIL125 Is Used
High-force actuation
Over 6.1 kN at 0.5 MPa for presses, lifting tables and dampers.
Holding at the stroke end
The lock keeps the rod at the locked end when the air supply is cut.
Vertical and inclined axes
Lifting units that must not drift down from the locked end when the air is off.
Choosing the Right SIL125 Configuration
Start with the stroke. Pick the exact travel your machine needs; a longer stroke adds length, weight and air consumption without adding force. If your length is not listed, request a quote and we will confirm whether it can be built.
Then choose the mounting. Basic (no code) uses the cylinder's own mounting holes. This bore is stocked with LB foot, FA front flange, CB double clevis, TC center trunnion, FTC front trunnion. Foot and flange mountings hold the cylinder rigid for straight-line loads; clevis and trunnion mountings let it pivot when the load moves in an arc.
Finally pick the version. It starts with the lock position: F locks the piston at the front (rod-end) cover, B at the rear cover, so choose the end where the load must be held. Then: S adds a magnet for position sensors.
AirTAC SIL125 FAQ
Discontinued: AirTAC has replaced the SILF/SILB series with the SAILF/SAILB series. Every SILF/SILB code on this page is supplied as the current SAILF/SAILB with the same code after the prefix, for example SILF125X25 ships as SAILF125X25. The specifications on this page are those of the SAILF/SAILB you receive. Older hyphenated codes are the same code: SILF125X50-S ships as SAILF125X50S.
The position of the lock. F has it in the front (rod-end) cover and holds the piston at that end of the stroke; B has it in the rear cover and holds the piston at the other end. Bore, force and mountings are the same.
Supply air to the port on the lock side and the lock releases automatically; it can also be released by hand with the lever. AirTAC advises against 3-position valves (closed or pressure center) for this cylinder, because pressure trapped on the lock side stops the lock from engaging.
No. Every SIL125 gives about 6136 N push and 5734 N pull at 0.5 MPa, whatever the stroke.
1/2" ports, PT thread as standard.
Basic plus LB foot, FA front flange, CB double clevis, TC center trunnion, FTC front trunnion. Use foot or flange for straight-line loads, clevis or trunnion when the cylinder must pivot.
Usually yes. Request a quote with the stroke, mounting and version and we will confirm whether it can be built, plus price and lead time.
0.15 to 1.0 MPa operating pressure (proof 1.5 MPa) and -20 to +70 °C on filtered air.
No. You can order a single SIL125. Orders are processed and handed to the carrier within 3-5 business days.
Buying the SIL125 from AirtacDistr
Genuine AirTAC parts
Every order code on this page is the AirTAC factory part number. Specifications follow the AirTAC Products Catalog 2026A. About us
Ready in 3-5 business days
That is our time to process the order and hand it to the carrier. No minimum order: a single piece can be ordered.
14-day returns, 1-year warranty
Return within 14 days of delivery; the buyer pays return shipping. The warranty covers defects not caused by misuse. Return policy
Engineering help
Send your application details and we will confirm the right order code, usually within 7-8 hours. Ask us
Page data checked against the live catalog on 2026-11-11.
Request a Quote for the SIL125
Send the order code, quantity and destination. We confirm price, stock and lead time, usually within 7-8 hours.