Check the listing for details. External Tooth Lock Washers Stainless Steel All Sizes and Quantities in Listing. Condition: New. Listed at 7.75 USD. External Tooth Lock Washers 410 Stainless Steel External Tooth Lock Washers are a hardened curcular washer that have twisted prongs cslled "teeth" which extend out from the outer edge of the washers. These lock washers offer the greatest locking efficiency since the teeth are on the largest radius and provide greater torsional resistance. External tooth lock washers are the most preferable of all types of tooth style lock washers. General Product Information (View Full 2D Dimensional Drawing File By Selecting Desired Length in Drop Down Menu) Nominal Washer Size Inside Diameter Outside Diameter Thickness Minimum Thickness Maximum #2 0.095" 0.189" 0.010" 0.013" #4 0.123" 0.260" 0.012" 0.018" #6 0.150" 0.320" 0.016" 0.022" #8 0.176" 0.381" 0.018" 0.023" #10 0.204" 0.410" 0.018" 0.024" #12 0.231" 0.475" 0.020" 0.027" 1/4" 0.267" 0.510" 0.023" 0.028" 5/16" 0.332" 0.610" 0.028" 0.034" 3/8" 0.398" 0.694" 0.032" 0.040" 1/2" 0.530" 0.900" 0.037" 0.045" 5/8" 0.663" 1.070" 0.042" 0.050" 3/4" 0.795" 1.260" 0.047" 0.055" Material 410 Stainless Steel : The lock washers in this listing are made of a 410 grade stainless steel which has a higher iron content giving great strength but also making the washer Magnetic Shipping: All orders placed before 3:30 pm EST Will Ship Same Day Tracking is provided on ALL Orders Priority Mail Shipping service is offered at a discount of only $3.95 UPS Ground UPS Next Day Air is available, Please inquire for pricing Returns : ALL returns are accepted if returned within 60 days. Money Back or exchange guaranteed. NO Restocking Fees. For YOU, we constantly strive to find ways of improving our performance.