![]() If you want a deeper read, here is the 100 page NASA Fastener Design Manual. The chart on the last page is quite illuminating. Handle hardware (nut, lock washer, flat washer) 292-0036 SKU: 292-0036 Condition: New Availability: usually ships 1-5 days Shipping: Calculated at Checkout. This link contains quotes and a chart from the NASA paper. ![]() ![]() However, I'd like to add some content about split-ring "lock" washers.īoth the Germans in the (I think) 1930s and NASA in the (I think) 1960s determined that split-ring spring washers, aka split-ring "lock" washers, actually speed the loosening of a nut under vibration when no other method is used of locking the thread in place. It appears they provided locking nuts, the kind with a piece of nylon or fibrous material in it. It appears they did not provide any flat washers, is that correct? This is to prevent damage to the surface. ![]() They are normally installed so the split-ring "lock" washer is against the nut, and the flat washer is between the split-ring washer and the surface. ![]()
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