BIESSE Rubber Sealing Ring Gasket Fittings Suction Cup Sealing Ring

When a vacuum pod stops holding a panel, the sealing ring is usually the part that has failed, not the vacuum pump. These rings are black rubber seals for Biesse vacuum blocks, in three sizes: FNAW550129 (132x146x6 mm), FNAW550128 (132x75x6 mm) and FNAW550127 (132x54x6 mm). All three are 6 mm thick with a 132 mm common length, so the width is what separates them.

A vacuum pod that leaks is easy to misread. The panel moves during machining, the cut comes out 0.2 mm off, and the first suspicion is the pump or the valve. Most of the time it is the rubber ring under the pod: it has taken a set or been cut by a panel edge, and vacuum escapes through a gap you cannot see from above.

These rings replace that rubber on Biesse vacuum blocks, in three sizes: FNAW550129 at 132 x 146 x 6 mm, FNAW550128 at 132 x 75 x 6 mm, and FNAW550127 at 132 x 54 x 6 mm. The 132 mm length and the 6 mm thickness are common to all three, so the number that decides which ring you need is the width.

Black rubber is the whole construction. What matters in use is that the ring compresses by the same amount all the way round: a ring hardened at one corner leaks there even though it looks intact. That is why the symptom is position-dependent, with some pods holding and others not on the same machine.

Measure the old ring before ordering, not the pod. Length, width and thickness are the three numbers, and the width separates the three part numbers. If the ring is still in place and no model number is readable, measure it and send the figures.

What separates the three sizes, and what stays the same:

• Three sizes, one family — FNAW550127, FNAW550128 and FNAW550129 cover three pod footprints.
• 132 x 146 x 6 mm — FNAW550129, the widest of the three rings.
• 132 x 75 x 6 mm — FNAW550128, the mid-width ring.
• 132 x 54 x 6 mm — FNAW550127, the narrowest of the three.
• 6 mm thickness — the same on all three, so pod clearance does not change between sizes.
• Black rubber — the sealing face that compresses against the panel.
• Biesse vacuum block fit — listed as a rubber seal gasket fitting for Biesse machines, seated under the pod.
• Ring, not the pod — these are the replaceable seals; the vacuum blocks themselves are a separate item.
• Seated under the pod — the ring sits between the pod and the panel, which is why it takes damage from panel edges before anything else in the assembly.
• Thickness sets clearance — 6 mm is the same on all three sizes, so changing a ring does not change how high the pod sits on the table.
• Three numbers, one order — length, width and thickness off the old ring are enough to pick the part number without knowing the machine serial.

Why the ring is worth checking before the pump:

• The cheap half of a vacuum problem. A 6 mm ring costs a fraction of a pump, and a leaking pod usually traces back to the ring rather than to vacuum supply.
• Width decides, not length. All three rings share 132 mm length and 6 mm thickness, so one measurement — width — tells you which part number you need.
• Holds pods at the same height. Because thickness is common to the three sizes, replacing a ring does not change how the pod sits against the panel.
• Position diagnosis. A ring that has hardened in one zone is why one pod leaks and the next one holds; replacing the ring removes that difference.
• Consumable planning. Rings are wear parts and take damage from panel edges. Keeping a set per machine avoids waiting on a single ring.
• Fit confirmed before ordering. Send the measured length, width and thickness of the old ring, and the part number is matched to those figures.
• Seals age, they do not fail suddenly. A ring that has been on a pod for years compresses less than a new one, so a machine loses grip gradually rather than all at once.

Measure the old ring. All three are 6 mm thick and 132 mm long: 146 mm wide is FNAW550129, 75 mm wide is FNAW550128, 54 mm wide is FNAW550127.

If some pods hold and others do not on the same machine, the supply is working and the ring is the difference. A hardened or cut ring leaks at one zone.

Black rubber. The ring is the compressible element between the pod and the panel.

No. This listing is the sealing ring. The Biesse vacuum blocks are supplied as a separate item.

They are listed for Biesse vacuum blocks. On another machine, measure the ring and compare against the three sizes before ordering.

6 mm on all three sizes, which is also the clearance figure that has to match your pod.

They are ordered per part number and size. Mixed sets are arranged by ordering the quantity of each size your machine uses.

The measured length, width and thickness of the old ring, the part number if readable, how many pods the machine has, and the machine model.