Also known as elastic stop nuts, this self locking nut uses a nylon collar that resists turning. The nylon insert collar retains its locking ability up to 250 degrees F (121 degrees C). A4 stainless steel is functionally equivalent to 316 grade and is also known as "marine grade". Stainless steel significantly improves resistance to tarnishing or corrosion.DIMENSIONAL ATTRIBUTES Diameter (Nominal): M5 Thread Pitch: 0.8 Diameter (Dimension): 5mm Thread Length (Nominal): 6.3mm Across Flats (Basic): 8mm Height (Basic): 6.3mmPRODUCT ATTRIBUTES Category: High Hex Nylon Insert Stop Lock Nuts System of Measurement: Metric Brand: Aspen Fasteners® Drive Style: External Hex Drive Thread Length: Full Thread Thread Direction: Right-Hand Thread Material: Stainless Steel Material Grade: A4 Stainless Steel Coating: Uncoated Standards and Specifications: DIN 982