Reamer 2.37 mm

H7 Precision in Every Pass: The Straight Reamer Demanded by Slot Preparers

The Sloting Plus HSS Ø2.37 mm SP143725 Reamer is a precision tool made from HSS (High Speed Steel), designed for the tuning and preparation of aluminium and plastic parts in the slot racing world. With H7 tolerance, it ensures that the resulting hole is exactly sized throughout its length, without variations or taper.

Technical Features

• Material: HSS (High Speed Steel)
• Diameter: Ø2.37 mm
• Precision: H7
• Contents: Bag with 1 unit
• Reference: SP143725

Why a Straight Reamer and Not a Tapered One

This is one of the most common questions in the preparation workshop. The difference is significant: it directly affects the precision of the fit and the lifespan of the worked piece.

• Consistent Precision: The cutting diameter is identical from the start to the end of the tool, something that a tapered reamer cannot offer due to its own geometry.
• Total Accuracy: The reamed hole is perfectly sized throughout its length. There is no risk of one end being more open than the other.
• Secure Axle Fit: The axle housed in the hole contacts uniformly along the entire length of the bore, not just at one point, which improves stability and reduces play.
• No Risk of Ruining the Piece: With a tapered reamer, there is a real danger of excessively enlarging one end of the hole, ruining the piece. With this straight reamer, that risk disappears.

Applications in Slot Preparation

This reamer is specifically designed to work on aluminium and plastic, the most common materials in chassis, mounts, motor supports, and other preparation parts in slot racing. The H7 tolerance makes it particularly suitable for precision adjustments where the play between axle and housing must be minimal and controlled.

It is the right tool when there is a need to ream an existing hole to an exact dimension, for example when adapting axles, bushings, or bearings of specific sizes.

Recommended Mounting and Use

To achieve the best results, it is recommended to use the reamer at low speeds and with light lubrication when working on aluminium. For plastic, dry use usually yields optimal results. It is essential that the pre-existing hole is already very close to the final size: the reamer removes very little material and is not designed to drill from scratch.

Frequently Asked Questions

What axle diameter is this Ø2.37 mm reamer useful for?

It is particularly practical for adjusting housings intended for axles or bushings with a nominal size around 2.37 mm. The H7 tolerance ensures a sliding fit or minimal tightening, depending on the actual diameter of the axle to be housed.

Does it work on other materials besides aluminium and plastic?

Sloting Plus specifically designs and recommends it for aluminium and plastic. On harder materials, the tool may not perform optimally and its lifespan could be compromised.

How many units does the bag contain?

The bag contains 1 unit.

What is the difference between H7 precision and other tolerances?

H7 is an ISO standard tolerance that defines a fitting hole with a very small deviation from the nominal diameter. It is the usual reference for precision sliding fits in mechanics, where it is necessary for parts to fit without excessive play but without interference.

Do I need any special tool holder to use it?

The reamer can be used with a standard chuck or collet compatible with its shank diameter. For greater precision, a concentric tool holder is recommended, and working at low speeds.

The Sloting Plus SP143725 is a 2.37 mm HSS straight reamer with H7 precision tolerance, purpose-built for slot car preparation work on aluminium and plastic parts. Unlike tapered reamers, it delivers consistent diameter from tip to end, ensuring perfectly sized holes with no risk of taper or oversizing. An essential precision tool for slot car builders and tuners seeking reliable, repeatable results in axle and bushing fitting.