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Product Description Hillman Stainless Steel Nylon Insert Coarse Thread Lock Nut - Stainless steel. Hex stop nut. Coarse thread. Low-carbon steel. - Material: Stainless Steel, Thread Diameter: 1/4", Thread Density: Coarse, Threads Per Inch: 20 tpi, Finish: Zinc, Pkg Qty: 50, Package Type: Box From the Manufacturer Nylon Insert Lock Nuts are also known as stop nuts. Lock nuts are used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material are located at the top of the nut. The purpose of the nylon insert is to prevent backing off or loosening from vibration.