for slip fit. Example:

When procuring NAS1057 spacers, adherence to the NAS standard is mandatory.

Jack had been struggling to finish a custom shelving unit. The design required a series of precisely aligned shelves, and Jack was having trouble achieving the level of accuracy he wanted with the materials on hand. The NAS1057 spacers, with their accurately machined surfaces and corrosion-resistant coating, seemed like the perfect solution.