The standard executions NSF is in flanged nut with single-start trapezoidal thread, right-hand tightening direction. The NSF-W is in polyamide-based self-lubricating technopolymer, beige colour and NSF-F is in acetal resin based self-lubricating technopolymer, produced from FDA compliant raw material (FDA EU 10/2011), white colour. Thanks to the high wear resistance of the material, NSF-W nuts are particularly suitable for use in the presence of processing residues and dust such as those coming from woodworking machines and laboratory instruments. Thanks to its material that has been approved for contact with food (FDA EU 10/2011), NSF-F nuts are particularly suitable for use in the food and pharmaceutical industries.