Check the listing for details. 3.1mm ID Metric Split Lock Washer Part # C30990. Condition: New. Listed at 4.23 USD. Questions? Message Us! If you are not sure this will fit your application please contact us with your model and ser #. We are not responsible for shipping on returns for wrong parts if you don't contact us first. 3.1mm ID Metric Split Lock Washer Part # C30990 3.1mm ID Metric Split Lock Washer Part # C30990 Product M3 Screw 3.1mm ID Grade 8 Spring Steel Metric Split Lock Washer Zinc Plated Finish, 3.1 to 3.4mm ID x 6.2mm Max OD, 0.8mm Thick Specifications Screw Size M3 Material Spring Steel Inside Diameter (mm) 3.10 Outside Diameter (mm) 6.20 Thickness (mm) 0.80 Hardness 44-51 HRC Material Grade 8 Military Specification Does Not Meet Military Specifications Minimum Inside Diameter (mm) 3.10 Maximum Inside Diameter (mm) 3.40 Minimum Outside Diameter (mm) 6.20 Maximum Outside Diameter (mm) 6.20 Maximum Thickness (mm) 0.80 Fastener Standard DIN 127 System Of Measurement Metric Finish Coating Zinc UNSPSC Code 31161801 Shipping Shipping cost: Varies Delivery time:Ships within one business day. Payment We accept the following payment methods: PayPal Please contact us if you have any questions. Service If you are not sure this will fit your application please contact us with your model and ser #. We are not responsible for shipping on returns for wrong parts if you don't contact us first.