Montessori Bolt Block Acorn Nut

$ 19.99

Only 1 left in stock

Unique high quality Montessori Bolt Block handcrafted from maple wood. Varnished with non toxic water based finishes. Also available as a set of 3.

Practical Life Activity

This Montessori Practical Life activity is typically used in the 3-6 year old classroom. This material helps develop and strengthen hand and finger muscles of the pincer grip. It is one of the many examples of how design in Montessori materials indirectly prepare for a future skill – in this case for holding a pencil. In addition, the practical life aspect helps a child to learn how to thread, tighten and loosen a bolt and nut!

An excellent addition to any preschool or homeschool classroom that is both intriguing to children and develops concentration.

This bolt is considered challenging in difficulty, or Number 3 in the set of 3.


  • 3/8″ Bolt and corresponding Acorn Nut with an oversized Washer
  • Base is approximately 2-3/8″ square (6cm) and 1″ thick (1cm) allowing it to be comfortably held in the hand

The acorn nut is small and therefore more challenging to pick up and hold in position in the hand. Its shape makes it a little slippery to grip, with one smooth domed side. It is also unevenly weighted (heavier in the base than the dome) so it tends to roll around in your hand. The post on this block is very short, adding to the fine motor control skill necessary to be able to start threading.   These characteristics contribute to the higher level of difficulty. Finger dexterity and pincer grip continue to be developed through the action of being able to hold the small nut and mastering the twist needed to get the first few threads to catch on the bolt.


One Bolt block

One Acorn Nut

One Washer

Weight 0.095 kg
Dimensions 2.75 × 2.75 × 2 cm


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