Metric Screws ø4.25 x 9.2mm Cone Head

Precision Screws for Those Who Leave Nothing to Chance

In the world of slot racing and competitive modelling, a poorly adjusted screw can make the difference between a perfectly rigid assembly and a part that vibrates, loses position, or outright fails on the track. The Metric Screw ø4.25 x 9.2 mm Conical Head BRM-S133B2 is designed to meet that demand: exact measurements, a conical head that sits flush with the surface, and the peace of mind of using the correct replacement.

Features and Function

• Diameter: ø4.25 mm
• Length: 9.2 mm
• Head Type: conical, for a clean flush fit with the mounting surface
• Reference: BRM-S133B2

The conical head allows the screw to be recessed in the housing without protruding, avoiding interference with other parts of the assembly. This is particularly useful in fastening points where space is limited or where the screw head could rub against another moving part.

Applications and Compatibility

This type of small diameter metric screw is commonly used in the assembly and adjustment of slot car chassis, securing motor mounts, assembling bodies, and adjusting mechanical assemblies in precision models. As a BRM reference, its most direct use is the replacement or substitution of the original screw in models and sets of that brand, ensuring that mounting tolerances remain within specification.

If you are preparing or repairing a BRM set and need to replace this screw, having the exact reference —both in measurements and code— is the only way to ensure a fit without play or unwanted tension.

Assembly and Preparation

When working with screws of these dimensions, we recommend:

• Using the appropriate screwdriver for the head type to avoid damaging the housing.
• Avoid over-tightening: in technical plastic or resin parts, the torque should be just enough to keep the assembly firm without stressing the material.
• If the housing is worn, consider using a low-strength thread locker to secure the position without hindering future disassemblies.
• Always keep a small stock of this type of screw: they are small parts that can easily be lost during bench work.

Frequently Asked Questions

What models or sets is this screw intended for?

As a BRM reference (BRM-S133B2), its primary application is the replacement of the original screw in products of that brand. If you have doubts about its compatibility with your specific set, consult the assembly manual or the parts breakdown of the model in question.

What advantage does the conical head have over a cylindrical head?

The conical head is recessed in the housing and does not protrude from the surface, eliminating potential interference with other parts and offering a cleaner visual finish. It is the usual solution when the working space is limited.

Is it sold in a pack or individually?

The available information corresponds to the reference BRM-S133B2 as provided by the manufacturer. We recommend checking the product sheet in-store to confirm the exact contents of the packaging.

Is it necessary to use any thread locker?

In most assemblies, it is not essential, but if the assembly is subjected to continuous vibrations —as occurs in slot cars on track— a low-strength thread locker can help maintain tightness without hindering future disassemblies.

BRM-S133B2 metric conical head screw ø4.25 x 9.2 mm, designed for precision assembly in slot car chassis, motor mounts and scale modelling kits. A direct replacement part for BRM sets, ensuring tight tolerances and rattle-free builds. Compatible with BRM original specifications for reliable performance on the track.