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KP-08 pillow block bearing, flange mount, for 8mm shaft, zinc alloy housing, 42mm between mounting holes
Ideal for supporting and precisely guiding an 8mm shaft in industrial and DIY applications, this flange-type pillow block bearing offers quick and rigid mounting, smooth and stable operation, enhanced dust protection thanks to its seals, and compatibility with 42mm mounting holes for easy alignment in compact assemblies.
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The KP-08 pillow block bearing is a mounting block that combines a zinc alloy housing with a self-aligning ball bearing, designed to support a shaft, rod or screw of 8 mm. It is used at the ends of the T8 trapezoidal lead screw, on rotating shafts and transmission mechanisms, in 3D printers, small CNC machines and laboratory conveyor belts.
The outer ring of the bearing has a spherical shape and sits in a seat of the same shape in the housing, so the bearing can tilt slightly and compensate for a small misalignment between the shaft and the support. The inner ring has a bore of 8 mm and is fixed on the shaft with a set screw. The distance between the two mounting holes is 42 mm, and the shaft is located at the middle of this distance.
The main features include the zinc alloy housing with two mounting ears, the sealed ball bearing with black seals on both sides, the inner ring extended with the set screw and the P08 marking on the housing. The product is purely mechanical and does not require a power supply.
Specifications:
Model: KP08 (P08 marking on the housing)
Shaft diameter: 8 mm
Distance between mounting holes: 42 mm
Housing material: Zinc alloy
Bearing type: Ball, sealed, self-aligning
Shaft locking: Set screw on the inner ring
Dimensions: 55 x 13 x 28 mm
Layout:
| Element | Function |
|---|---|
| Housing with mounting ears | Supports the bearing and is fixed to the mounting surface by two screws, with the holes 42 mm apart. |
| Mounting holes (left and right) | Take the screws that secure the housing to the support and carry the load transmitted by the shaft. |
| Ball bearing with black seals | Guides the shaft and allows free rotation. The seals protect the balls from dust. |
| Spherical outer ring | Allows a slight tilt of the bearing in the housing and compensates for the misalignment between shaft and support. It is not adjusted separately. |
| Inner ring bore, 8 mm | Receives the 8 mm shaft, rod or screw. |
| Set screw on the inner ring | When tightened, fixes the inner ring to the shaft and prevents axial sliding. When loosened, allows the bearing to be moved along the shaft. It is operated with a small Allen key. |
| P08 marking | Indicates the housing type and serves only for identification. |
Usage:
Measure the mounting holes with a caliper and choose screws and nuts suited to their diameter.
Mark the hole positions on the support 42 mm apart, with the shaft in the middle, that is 21 mm from each hole, then drill. When mounting two bearings, check that the axes of the two are on the same line.
Clean the shaft of old oil and chips, then check that it has a diameter of 8 mm and a smooth surface, without burrs.
Starting with the slightly loosened set screw, insert the shaft through the 8 mm bore to the desired position. When mounting two bearings, pass the shaft through both before tightening the mounting screws.
Fit the mounting screws with washers under the head and tighten them only lightly at first. Turn the shaft by hand and let the bearing settle by itself, then tighten the screws evenly, a little at a time, alternating.
Do not tighten the screws with great force, as the zinc alloy may crack.
Finally, tighten the set screw clockwise until you feel resistance, then a little more, without excessive force. Turn the shaft again. If it rotates smoothly, without jamming, and the inner ring no longer slides on the shaft, the assembly is correct.
For stable results, keep the shaft straight and without large radial loads, and to move the bearing along the shaft, first loosen the set screw.
- Dimensions
- 55 x 13 x 28 mm
- Model
- KP08
- Type
- Ball bearing, sealed, self-aligning
- Housing material
- Zinc alloy
- Shaft diameter
- 8 mm
- Mounting hole spacing
- 42 mm
Produs destinat utilizarii in proiecte electronice, automatizari, prototipare, educatie si cercetare.
Produsul trebuie utilizat numai conform specificatiilor tehnice mentionate in descriere si/sau in documentatia produsului.
Avertismente generale de siguranta:
Nu utilizati produsul la tensiuni, curenti sau temperaturi peste valorile specificate.
Montajul si conectarea trebuie realizate de persoane cu cunostinte tehnice minime in domeniul electric/electronic.
Evitati scurtcircuitele, inversarea polaritatii si conectarea gresita a alimentarii.
Nu lasati produsul alimentat nesupravegheat in timpul testelor.
Produsul nu este jucarie si nu este destinat copiilor.
Pentru modulele electronice, se recomanda utilizarea in carcase, panouri sau montaje protejate, dupa caz.
Identificare produs:
Denumirea produsului, codul/SKU-ul si caracteristicile tehnice sunt mentionate in pagina produsului si/sau pe eticheta ambalajului.
Producator / Importator / Distribuitor:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Website: www.sigmanortec.ro
Persoana responsabila in UE:
Sigmanortec S.R.L.
Calea Bucuresti nr. 9, Targu Jiu, Gorj, Romania
E-mail: [email protected]
Documentatie si siguranta:
Pentru informatii suplimentare, fise tehnice, declaratii de conformitate sau instructiuni, ne puteti contacta la [email protected].
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The KP-08 pillow block bearing is a flange mount support for an 8 mm shaft. It is a purely mechanical product, so this tutorial shows how to choose the location, how to fix the housing and how to lock the shaft, step by step.
It is used in maker projects to support the ends of a T8 trapezoidal screw, a rod or a rotating 8 mm shaft. You will often find it on 3D printers, small CNC machines, transmission mechanisms and laboratory conveyor belts.
How it works:
The product has two parts. The first is the housing made of zinc alloy, with two mounting ears. The second is a sealed ball bearing fitted inside the housing. The outer ring of the bearing has a spherical shape and sits in a matching seat inside the housing. For this reason the bearing can tilt slightly and find its own position if the shaft is not perfectly aligned with the support. The inner ring has the 8 mm bore and a set screw that locks it onto the shaft.
The distance between the two mounting holes is 42 mm, and the shaft is located at the midpoint of this distance, so it is 21 mm from each hole. With this value you calculate the position of the holes on the plate where you mount the bearing. If the shaft must pass through a point with coordinate X, the mounting holes are made at X - 21 mm and at X + 21 mm.
Example for a T8 screw supported at both ends, with the axes of the two bearings 300 mm apart. For the first bearing, with its axis at 0 mm, the holes are made at - 21 mm and at + 21 mm. For the second one, the holes are made at 300 - 21 = 279 mm and at 300 + 21 = 321 mm, measured on the same line from the axis of the first.
Connection:
The product has no electrical connection, so there is no power supply and no logic levels. The connection is mechanical, between the mounting surface, the housing and the shaft. In the table, instead of pins, there are the elements that are joined.
| Product pin | Connects to | Role |
|---|---|---|
| Left mounting hole | Mounting surface, via screw and nut | Fixes the housing and takes the load transmitted by the shaft. |
| Right mounting hole | Mounting surface, via screw and nut | Fixes the housing on the other side, 42 mm from the first hole. |
| Inner ring bore, 8 mm | The 8 mm shaft, rod or screw | Guides the shaft and allows free rotation. |
| Set screw on the inner ring | The 8 mm shaft | Fixes the inner ring to the shaft so it does not slide axially. |
Choose screws and nuts that match the diameter of the mounting holes, and measure the holes with a caliper before buying the screws. To avoid deforming the housing, use washers under the screw heads.
Buttons, adjustments and indicators:
| Element | What it does | How to use it |
|---|---|---|
| Set screw on the inner ring | Tightens the inner ring onto the shaft and fixes it in the desired position. | Tighten it with a small Allen key, after the shaft has been inserted and the bearing has been aligned. Loosen it to move the bearing along the shaft. |
| Spherical outer ring | Allows a slight tilt of the bearing in the housing and compensates for misalignment. | It is not adjusted separately. Let it settle on its own while the set screw is loosened and the housing is not fully tightened. |
| P08 marking on the housing | Indicates the type of housing. | Used for identification only. |
The product has no potentiometers, jumpers, switches, LEDs or display. The only element that is adjusted is the set screw.
To adjust the set screw, start with the screw slightly loosened, just enough to let the inner ring slide on the shaft. Insert the shaft through the bore to the desired position and turn it by hand to check that it rotates freely. Tighten the screw clockwise until you feel resistance, then a little more, without excessive force. Turn the shaft again. If it rotates smoothly and the inner ring no longer slides on the shaft, the locking is correct.
Configuration:
This section describes the mounting of the bearing. The parameters to check are in the table below.
| Parameter | Value | What you should check |
|---|---|---|
| Shaft diameter | 8 mm | The shaft must have a diameter of 8 mm and a smooth surface, without burrs. |
| Distance between mountings | 42 mm | The holes on the support are made at this distance, measured between the centers of the holes. |
| Housing material | Zinc alloy | Do not overtighten the mounting screws, so that the housing does not crack. |
| Locking on the shaft | Set screw | Tighten it after alignment. |
Mark the positions of the mounting holes on the support, 42 mm apart and with the shaft in the middle, then drill. For two supports, check that the two axes are on the same line.
Clean the shaft of old oil and chips. Loosen the set screw of the bearing by half a turn.
Insert the shaft through the 8 mm bore. When mounting two bearings, pass the shaft through both before tightening the mounting screws.
Place the mounting screws with washers, but tighten them only lightly at first. Turn the shaft by hand and let the bearing settle on its own. Then tighten the mounting screws evenly, a little at a time, alternating between them.
At the end, tighten the set screw on the shaft and turn the shaft by hand. The rotation must be smooth, without blockages. The product has no electronic settings, so there is nothing to save after mounting.
Usage example:
Supporting the end of a T8 trapezoidal screw on the Z axis of a 3D printer or a small CNC machine. Use two KP-08 bearings, one at the top end and one at the bottom end of the screw, both mounted on rigid plates.
The values used are an 8 mm shaft, a distance between mountings of 42 mm and a set screw loosened at the beginning. The holes on each plate are made 21 mm on either side of the screw axis.
Place the two supports in line and insert the screw through both bearings. Fit the mounting screws with washers, tighten them lightly, turn the screw by hand, then tighten them evenly. At the end, tighten the set screw only on the bearing that must take the axial load, and check that the trapezoidal screw rotates smoothly along its entire length.
Common problems:
The shaft rotates with difficulty or gets stuck. The usual cause is misalignment of the two supports, or mounting screws tightened before the bearing has settled. Loosen the mounting screws, turn the shaft by hand until the bearing settles, then tighten evenly again.
The inner ring slides on the shaft. The set screw is not tightened enough, or the shaft surface is worn. Tighten the set screw until you feel resistance and check that the shaft has a diameter of 8 mm.
The holes on the support do not match the housing holes. The measured distance was not 42 mm between centers. Measure again between the centers of the holes, not between the edges, and redo the markings.
The housing has cracked near the holes. The screws were tightened with too much force or without washers. Replace the support and use washers under the screw heads, tightening evenly.
The bearing makes noise or heats up. The shaft has burrs or chips, or the lubrication is missing. Clean the shaft and check the lubrication of the bearing periodically.
Limitations and tips:
The KP-08 bearing is suitable for moderate loads and low or medium speeds, on 8 mm shafts. The zinc alloy housing does not tolerate excessive tightening or large shocks, and the tilt allowed by the spherical ring is small, so align the supports as well as possible.
With two such bearings you can build supports for a T8 trapezoidal screw, transmission shafts or rollers for laboratory mechanisms. For a longer service life, keep the shaft clean and lubricated, and avoid large radial loads.
