Large Nuts and Bolts

Safety

Each nut and bolt must not fit the small parts test cylinder (1.25 in. wide × 2.25 in. deep); nuts at least 4 cm (1.6 in.) across and bolts at least 6 cm (2.4 in.) long do not fit. Real metal hardware nuts and bolts are not used.
Check wooden threads for cracks and splinters before each use.

1
Carry the tray to the table and sit beside the child, with the bolt and the nut apart on the tray.
2
Pick up the bolt by its head with your non-dominant hand, shaft pointing up.
3
Pick up the nut and set it flat on the tip of the shaft.
4
Turn the nut slowly to the right with your thumb and fingers until it catches the thread, then keep turning until it reaches the head. The nut moving down the shaft as you turn is the point of interest.
5
Turn the nut the other way until it comes off. Place it beside the bolt.
6
Invite the child to put the nut on and take it off.
7
When the child stops, put the nut back on the bolt or set them apart as found, and return the tray to the shelf.

Three sizes of nuts and bolts, each nut fitting only one bolt
Two nuts on one long bolt
Bolts fixed upright in a wooden board, so the child turns each nut with one hand

A nut set on at an angle does not catch the thread, and a nut of the wrong size does not turn on.