Metric Screws ø4.5 x 9.2mm Tapered Head

Metric Countersunk Screws for Error-Free Assemblies

When it comes to preparing a chassis, adjusting a mechanical assembly, or assembling parts with tight tolerances, the screws make a difference. The metric screws BRM-S133A2, with a diameter of ø4.5mm and a length of 9.2mm, meet this need with a conical head geometry that allows for a clean and flush fit in the receiving part.

Product Features

• Reference: BRM-S133A2
• Diameter: ø4.5 mm
• Length: 9.2 mm
• Head Type: conical (countersunk)
• Thread: metric

Function and Performance

The conical head —also known as countersunk— is designed to sit flush with the surface once tightened, avoiding protrusions that may interfere with other parts or the aerodynamics of the assembly. This type of screw is common in applications where space is limited and the visual cleanliness of the assembly is as important as the strength of the joint.

In the realm of slot racing and competition modelling, every tenth of a millimetre counts. A poorly sized screw can create play, vibrations, or unwanted friction that detracts from the performance of the assembly. With the exact measurements of ø4.5 x 9.2mm, this screw falls into the category of precision screws aimed at specific applications.

Assembly and Preparation

For proper tightening without damaging the thread or the part, we recommend always using the screwdriver or wrench suitable for the type of drive of the head. In assemblies on technical plastic or machined aluminium —common materials in slot car chassis and modelling bases— it is important not to exceed the tightening torque: the conical head distributes the load well, but the receiving material has its own limits.

If you are going to reuse these screws in several preparation sessions, periodically check the condition of the thread to ensure that the tightening remains reliable.

Compatibility

As a standard metric thread screw, its compatibility depends on the thread pitch and size of the component in which it is installed. Always consult the technical data sheet of the receiving element before placing an order to ensure that the measurements fit your specific application.

Frequently Asked Questions

What is the difference between a conical head and a cylindrical head?

The conical head (countersunk) is designed to be flush with the surface of the part when tightened in a conical-shaped housing. The cylindrical head, on the other hand, sits above the surface. The conical head is preferable when a low profile and no protrusions are required.

Does this screw have anti-corrosion treatment?

The manufacturer's description does not specify a specific surface treatment. If your application requires resistance to moisture or chemical agents, please consult us before placing your order.

Are they sold in packs or individually?

The quantity per unit of sale is indicated in the store sheet. Check the product description or contact us if you need clarification before purchasing.

Can I use these screws in slot car chassis printed in resin or technical plastic?

It depends on the thread pitch and the diameter of the housing intended in the chassis. The measurements ø4.5 x 9.2mm are specific, so it is essential to verify that the receiving component is designed for this screw before proceeding with the assembly.

What tool is used for tightening?

The type of drive (slotted, Phillips, Torx, hex…) is not specified in the manufacturer's information. Consult the complete technical data sheet or contact Ministry of Hobby to obtain this information before placing your order.

The BRM-S133A2 is a metric countersunk (conical head) screw measuring ø4.5 x 9.2mm, designed for precision assembly in slot car preparation, static model kits and high-detail hobby applications. Its flush-fit conical head ensures a clean, snag-free finish on chassis, brackets and mechanical assemblies where tolerances are tight and every millimetre matters. Available at Ministry of Hobby, your specialist for slot racing parts, modelling supplies and competition accessories in Spain and Europe.