Metric Screws ø4.5 x 7.2mm Cone Head

The countersunk screws that make a difference in every assembly

In the world of modelling and slot racing, the small details define the quality of the assembly. The Metric Countersunk Screw ø4.5 x 7.2 mm BRM-S133A1 is one of those seemingly minor elements that, when well chosen, provide precision, reliability, and an impeccable finish to any project.

Features and function

These metric screws have a diameter of ø4.5 mm and a length of 7.2 mm. Their conical (countersunk) head allows it to sit flush with the surface once tightened, avoiding protrusions that may interfere with other components or affect the appearance of the assembly.

• Head type: conical (countersunk)
• Diameter: ø4.5 mm
• Length: 7.2 mm
• Reference: BRM-S133A1

Common applications

The conical head is especially useful when working with parts where the screws need to be flush: securing bodies, joining chassis parts, mounting bases, or any point where a conventional protruding head could cause interference or be unsightly.

In the realm of slot racing and competition modelling, poorly chosen screws can lead to vibrations, play, or even premature wear of threaded fittings. Having the correct size from the outset saves time in the workshop and avoids frustrations during preparation.

Assembly and recommendations

To make the most of the conical head, the receiving hole must be countersunk at the correct angle. If the part is already prepared from the factory for this type of screw, the fit will be perfect and the head will be completely flush. It is recommended to use the exact size wrench or screwdriver to avoid damaging the profile of the head during tightening.

• Always check that the hole is countersunk before assembly.
• Tighten with the appropriate tool to avoid rounding the head.
• Do not overtighten: in plastic or resin parts, excess torque can damage the thread.

Frequently asked questions

What is the difference between a countersunk screw and a cylindrical head screw?

The conical (countersunk) head is designed to sit flush with the surface, while the cylindrical or button head protrudes. The conical is preferable when a clean finish or the absence of protrusions is a priority.

What type of projects is this screw designed for?

It is suitable for any modelling, slot racing, or construction project where a discreet and flush fastening is required: chassis, bases, bodies, diorama structures, etc.

Is a countersunk hole necessary to use conical head screws?

Yes. For the head to sit perfectly flush, the receiving hole must be countersunk at the corresponding angle. If mounted in a standard straight drill, the head will not be flush and the conical edge could be damaged.

How many units are included in the package?

The exact quantity per package is not specified in the available information. We recommend checking it directly on the product page or contacting our team.

The BRM-S133A1 metric countersunk screw (ø4.5 x 7.2 mm) is a precision fastener designed for slot car, scale modelling and diorama applications where a flush finish is required. Its conical head sits perfectly level with the surface, eliminating unwanted protrusions and ensuring a clean, professional assembly on chassis, bodies and structural components.