Shelf pin sizes: 5 mm vs. 1/4 inch

Which dimension should you measure?

Measure the small stud that enters the cabinet side, not the platform or spoon that carries the shelf. A support can have a broad resting surface and a much smaller insertion stud. Its overall length also does not necessarily equal its drilling depth.

A larger pin will not fit a smaller hole as intended. A smaller pin in a larger hole leaves a loose fit; it is not a conversion method. Measure carefully and compare the actual hardware documentation before modifying existing furniture.

Shelf pins and furniture connector pins do different jobs

A removable shelf rests on shelf supports. A furniture connector pin enters mating holes in two panels to locate a joint. Choosing 8 × 30 mm furniture pins for a case does not tell you which shelf-support diameter to buy. Cam locks, sleeves and other fittings are separate hardware systems.

In Plan Studio, case connections and removable shelf supports therefore have separate settings. Choose removable shelves first. Open the optional shelf hardware settings only if you need a different support shape or stud size.

Hole spacing is not hole diameter

The distance between holes in a row is a separate dimension. Kreg documents a 32 mm pitch on the referenced jig. That does not mean the holes are 32 mm wide, and it does not establish the setback or capacity for every cabinet. GrainBench’s current case plans show support holes at selected shelf heights; they do not generate a continuous adjustment grid.

Check the resting surface before drilling

Round pins, flat spoon supports and L-shaped supports can hold the shelf at different heights relative to the hole center. For shaped hardware, measure the insertion length, projection into the case and height of the resting surface. Four supports need to place the same shelf in one level plane.

• Identify the stud diameter and the matching drill requirement.
• Check insertion depth against the actual side thickness and drill tip.
• Confirm that the shelf has enough bearing beyond its end gap.
• Test the hardware in an offcut and check the shelf fit before drilling the case.

Continue with adjustable versus fixed shelves or calculate equal shelf spacing.