Inox Grower Washer M2

Small detail, big difference: the M2 Grower washer in stainless steel

In the preparation of a slot car, every element counts. The M2 stainless steel Grower washer (ref. SP150090) is one of those minor components that makes the difference between a setup that withstands the most demanding sessions and one that ends up loosening during a race. Its function is simple yet critical: to generate tension under the head of the screw to prevent loosening due to vibration or continuous use.

Product features

• Material: stainless steel, resistant to oxidation and wear.
• Size: M2 x 4 Grower (split pressure washer).
• Contents: bag with 20 units.
• Reference: SP150090.

Function and performance

Grower washers —also known as spring or pressure washers— act as a safety element in bolted joints subjected to vibrations. When installed, the split spring compresses and exerts a constant force on the screw, making it difficult for it to loosen progressively. In the context of slot racing and competitive modelling, where cars endure repeated accelerations, braking, and vibrations, having this type of washer at critical anchoring points is a common practice among the most meticulous preparers.

The stainless steel ensures that the part does not oxidise or lose properties over time, even in environments with some humidity or in setups that are frequently disassembled and reassembled.

Compatibility and applications

Designed for M2 metric screws, it fits a wide variety of applications within the hobby: securing motor mounts, anchoring guides, mounting bodies, assembling chassis, and any point where this calibre of screws is used. Its use is not limited to slot racing: it is equally valid in static models, dioramas, and any modelling project requiring small-format bolted joints.

Installation and preparation

Its installation is immediate: simply place the washer between the screw and the part to be secured before tightening. No additional tools or prior treatments are required. When disassembling, it is advisable to check the condition of the washer; if it has lost tension or has deformed excessively, it is best to replace it —hence the advantage of purchasing them in a bag of 20 units.

Frequently asked questions

What is the difference between a flat washer and a Grower washer?

The flat washer distributes the tightening load over the surface, while the Grower (pressure or spring) also exerts a retaining force that makes loosening due to vibration more difficult. For joints subjected to movement or repeated impacts, the Grower offers greater security.

Is it possible to reuse Grower washers?

In principle, yes, as long as the washer has not lost its tension or has not completely flattened after tightening. In competitive applications where reliability is paramount, many preparers prefer to install new washers at each major inspection.

What size screw is this washer intended for?

It is designed for M2 metric screws, one of the most common sizes in precision screws used in slot cars and modelling in general.

How many units are included in the bag?

Each bag contains 20 units, allowing for a good stock of spares without the need for frequent orders.

Does stainless steel influence the total weight of the assembly?

At M2 scale, the weight difference compared to other materials is practically imperceptible. The choice of stainless steel is primarily due to its corrosion resistance and the durability of the part.

Stainless steel M2 Grower washers for slot car preparation and scale modeling. Pack of 20 units, reference SP150090. These spring washers prevent loosening caused by vibration, making them a reliable choice for motor mounts, guide fixings and chassis assembly in 1:32 and 1:24 slot racing.