Bore Reducers
Top hats (bore) allow for a smaller axle or bolt to be used than the nominal size.
What Are Top Hats?
Top hats (bore reducers) are designed to fit precisely inside a ball bearing or castor bolt hole. The internal diameter of top hats have an open tolerance allowing for a smaller axle to be used than the nominal bearing size. This also allows for non-precision axles to be used, such as a commercial bolts. Top hats allow for a larger sized bearings to be used in a wheel for more load capacity. As in the below example, a wheel within a bracket using a bolt and nut should be paired with a bearing spacer, as this prevents the tightening force of the bolt and nut pushing the bearings together which will prevent them spinning freely.
Using Richmond’s top hats you will have complete flexibility to correctly fit a wheel to a smaller metric or imperial shaft. Please note, a wheel with top hats should always be a snug with an axle (never a sloppy fit). Our range of reducers makes this easy for you.
Steel Top Hat Reducer Range
| Part Number | Bearing Bore (mm) | Top Hat Bore (mm) | Top Hat Length (mm) | Overall Length (mm) | Flange Width (mm) | Flange Diameter (mm) |
|---|---|---|---|---|---|---|
| RED006UTI | 10 | 6 | 4 | 9.7 | 5.7 | 20 |
| RED1008UTI | 10 | 8 | 4 | 9.7 | 5.7 | 20 |
| RED1208OBT | 12 | 8 | 13.5 | 16.5 | 3 | 20 |
| RED1210OBT | 12 | 10 | 13.5 | 16.5 | 3 | 20 |
| RED-500-37 | 1/2 inch (12.77mm) | 3/8 inch (9.52mm) | 20 | 23.5 | 3.5 | 16 |
| RED625-50 | 5/8 inch (15.87mm) | 1/2 inch (12.7mm) | 28 | 31 | 3 | 22 |
| RED15X12 | 15 | 12 | 20 | 23 | 3 | 20 |
| RED15X50 | 15 | 1/2 inch (12.7mm) | 20 | 23 | 3 | 20 |
| RED20X12.8 | 20 | 1/2 inch (12.7mm) | 29 | 32 | 3 | 30 |
| RED20X62 | 20 | 5/8 inch (15.87mm) | 12.5 | 15.5 | 3 | 30 |
| RED25-4-62 | 25.4 | 5/8 inch (15.87mm) | 20 | 23 | 3 | 35 |
| RED25-4-19 | 25.4 | 3/4 inch (19.05mm) | 20 | 22 | 2 | 35 |
| RED25-4-20 | 25.4 | 20 | 15 | 18 | 2 | 35 |
| RED3020 | 30 | 20 | 35 | 38 | 3 | 40 |
| RED3025 | 30 | 25 | 35 | 38 | 3 | 40 |
| RED4020 | 40 | 20 | 49.5 | 54.5 | 5 | 50 |
| RED4025 | 40 | 25 | 49.5 | 54.5 | 5 | 50 |
High Impact Nylon Polymer Reducer Range
These are primarily used to reduce the bore size of Richmond’s pneumatic and puncture proof wheels.
| Part Number | Bearing Bore (mm) | Reducer Bore (mm) | Reducer Length (mm) | Overall Length (mm) | Flange Width (mm) | Flange Diameter (mm) |
|---|---|---|---|---|---|---|
| NRR001 | 3/4 inch (19.05mm) | 3/8 inch (9.52mm) | 15 | 17 | 2 | 30 |
| NRR002 | 3/4 inch (19.05mm) | 1/2 inch (12.7mm) | 15 | 17 | 2 | 30 |
| NRR003 | 3/4 inch (19.05mm) | 5/8 inch (15.87mm) | 15 | 17 | 2 | 30 |
| NRR004 | 1 inch (25.4mm) | 5/8 inch (15.87mm) | 15 | 17 | 2 | 35 |
| NRR005 | 1 inch (25.4mm) | 3/4 inch (19.05mm) | 15 | 17 | 2 | 35 |
| NRR006 | 1 inch (25.4mm) | 20 | 15 | 17 | 2 | 35 |
| NRR007 | 2 inch (50.8mm) | 20mm | 17 | 19 | 2 | 60 |
Need Some Assistance?
Fill out the form below and a member of our team will be in touch to find a solution for you.
Or call 1300 474 246 to talk to somebody in your state.
Showing 1–12 of 26 results
-
1/2 Inch Reduction Top Hat to sit 3/8 Inch Fittings (RED-500-37)
Add to cart Add to Quote -
15mm Top Hat (Bore Reducer) to suit 1/2 inch Fittings (RED15X50)
Add to cart Add to Quote -
15mm Top Hat (Bore Reducer) to suit 12mm Fittings (RED15X12)
Add to cart Add to Quote -
20mm Top Hat (Bore Reducer) to suit 1/2 Inch Fittings (RED20X12.8)
Add to cart Add to Quote -
20mm Top Hat (Bore Reducer) to suit 5/8 Inch Fittings (RED20X62)
Add to cart Add to Quote -
25.4mm Top Hat (Bore Reducer) to suit 5/8 Inch Fittings (RED25-4-62)
Add to cart Add to Quote -
30mm Top Hat (Bore Reducer) to suit 25mm Fittings (RED3025)
Read more Add to Quote -
40mm Top Hat (Bore Reducer) to suit 20mm Fittings (RED4020)
Add to cart Add to Quote -
40mm Top Hat (Bore Reducer) to suit 25mm Fittings (RED4025)
Add to cart Add to Quote -
Mild Steel Sleeve (SL148)
Add to cart Add to Quote -
Mild Steel Sleeve (SL151)
Add to cart Add to Quote -
Nylon Reducer 3/4″ OD x 3/8″ ID (NRR001)
Add to cart Add to Quote
Showing 1–12 of 26 results