Nylon Insert Flange Lock Nut DIN 6926 The inch Nylon Insert Flange is a hex drive nut and washer combination and is gaining popularity since it’s introduction to the marketplace about 2002. This product combines the best attributes of both common hex nylon insert and flange type lock nuts and requires sufficient thickness to accommodate wrenching height and nylon collar height. The flange makes the Nylon Insert Flange lock nut ideal when assembling components that consist of thin materials, slots or non-precision oversize holes. Mating part must extend at least one thread past the flange nut top surface to assure locking element engagement. The flange will typically require more torque to produce a clamp load than non-flange nuts.