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

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Showing 1–12 of 26 results

  • 1/2 Inch Reduction Top Hat to sit 3/8 Inch Fittings (RED-500-37)

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  • 15mm Top Hat (Bore Reducer) to suit 1/2 inch Fittings (RED15X50)

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  • 15mm Top Hat (Bore Reducer) to suit 12mm Fittings (RED15X12)

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  • 20mm Top Hat (Bore Reducer) to suit 1/2 Inch Fittings (RED20X12.8)

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  • 20mm Top Hat (Bore Reducer) to suit 5/8 Inch Fittings (RED20X62)

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  • 25.4mm Top Hat (Bore Reducer) to suit 5/8 Inch Fittings (RED25-4-62)

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  • 30mm Top Hat (Bore Reducer) to suit 25mm Fittings (RED3025)

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  • 40mm Top Hat (Bore Reducer) to suit 20mm Fittings (RED4020)

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  • 40mm Top Hat (Bore Reducer) to suit 25mm Fittings (RED4025)

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    Mild Steel Sleeve (SL148)

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    Mild Steel Sleeve (SL151)

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  • Nylon Reducer 3/4″ OD x 3/8″ ID (NRR001)

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Showing 1–12 of 26 results

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