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When a shaft needs reliable radial support in a compact, bolt-down package, a loose bearing alone won't cut it. Maintenance technicians, machine builders, and DIY fabricators working on conveyor frames, agricultural equipment, and light industrial assemblies need a mounted unit that installs fast, stays put, and tolerates the occasional splash or dust exposure. These two-bolt flange mounted ball bearings deliver exactly that — a pre-assembled bearing-in-housing solution ready to bolt onto any flat surface.
Each unit consists of a deep-groove ball bearing insert pressed into a kirsite (zinc alloy die-cast) two-bolt flange housing. Two series are available: the KFL series (oval flange plate) and the KP series (round flange plate), covering bore diameters from 8mm (~0.31 in) to 35mm (~1.38 in). The set-screw locking collar secures the shaft directly inside the bore, and the two mounting holes accept standard bolts for rigid surface attachment.
Typical use cases include light conveyor roller shafts, fan and blower shaft supports, small agricultural machinery pivot points, and DIY workshop jigs where a bolt-down bearing block is needed. The KFL oval flange suits narrow mounting rails, while the KP round flange works well on flat plates and brackets — making these two-bolt flange mounted ball bearings a versatile choice across multiple project types.
Oval (KFL) or round (KP) flange plate with two bolt holes allows rigid, vibration-resistant mounting to any flat surface without additional brackets.
Die-cast kirsite housing offers a favorable strength-to-weight ratio and resists light corrosion from moisture and dust in indoor or sheltered outdoor environments.
Nine bore sizes per series (8 / 10 / 12 / 15 / 17 / 20 / 25 / 30 / 35mm) cover the majority of light-duty shaft diameters used in conveyor, fan, and fabrication applications.
Integrated set-screw collar locks the bearing insert onto the shaft without requiring a machined shoulder, simplifying installation on plain round bar stock.
The inner bearing insert handles radial loads and limited axial loads in both directions, suitable for moderate-speed, light-to-medium duty rotating shaft applications.
Available in 1-piece or 5-piece packs — order a single unit for a repair job or a 5-pack for multi-point shaft support on longer conveyor or drive systems.
| Series | KFL (oval flange) / KP (round flange) |
|---|---|
| Bore Diameter Range | 8mm – 35mm (0.31 in – 1.38 in) |
| Available Bore Sizes | 8 / 10 / 12 / 15 / 17 / 20 / 25 / 30 / 35mm |
| Housing Material | Kirsite (zinc alloy die-cast) |
| Bearing Insert Type | Deep-groove ball bearing |
| Shaft Locking Method | Set screw |
| Number of Mounting Bolts | 2 |
| Flange Style | See variant options |
| Overall Housing Width | See variant options |
| Bolt Hole Spacing | See variant options |
| Load Type | Radial; limited axial (both directions) |
| Lubrication | Pre-lubricated (grease-filled) |
| Packing Quantity | 1 Pcs or 5 Pcs (see variant options) |
The KFL series features an oval two-bolt flange plate, which is narrower and fits better on mounting rails or channels with limited width. The KP series uses a round two-bolt flange plate, which provides a larger footprint and is better suited for flat plates, brackets, or surfaces where bolt-hole placement flexibility matters. Both series share the same bore sizes and locking mechanism — the choice comes down to your mounting surface geometry.
Order the bore size that matches your shaft's outer diameter exactly. For example, if your shaft is 20mm in diameter, select the 20mm bore variant (KFL004 or KP004). A bore that is too large will allow the shaft to wobble even with the set screw tightened; a bore that is too small will not accept the shaft. If your shaft is in inches, convert to millimeters first (1 inch = 25.4mm) and select the closest available bore size.
Kirsite (zinc alloy) housing is lighter than cast iron and adequate for light-to-medium duty applications such as conveyor rollers, fans, and small agricultural equipment. It is not recommended for heavy shock loads, high-vibration industrial machinery, or applications where the housing itself bears significant structural load. For heavy-duty environments, consider cast iron or pressed-steel housed units instead.
The kirsite housing resists light moisture and dust exposure in sheltered outdoor settings. However, these units are not rated for continuous immersion, washdown environments, or highly corrosive atmospheres. For outdoor use, ensure the bearing is shielded from direct rain and consider applying a light coat of grease around the housing seam to extend service life. For fully wet or corrosive environments, stainless steel housed units are a more appropriate choice.
Yes. The set-screw locking collar is designed to grip plain round bar stock directly, so no machined shoulder, keyway, or snap-ring groove is required. Tighten the set screw firmly against the shaft using the appropriate hex key. For best results, ensure the shaft surface is clean and free of oil or grease at the locking point before tightening.
Order a single unit if you need one bearing point — for example, replacing a failed unit on an existing machine or supporting one end of a short shaft. Choose the 5-pack if your project requires multiple support points along a conveyor, drive shaft, or multi-roller assembly, or if you want to keep spares on hand for maintenance. The 5-pack offers a lower per-unit cost compared to buying five individual pieces separately.
