SAIMA is dealing the screw with washer series named 310w/Washers. We receive the quotation request from 2-3 companies every day. As you may know the screw production lot is to be approx. 30Kpcs. How are the assembled washers like spring washers, flat washers, external washers and internal washers? It is said over 100K-200K pcs (it depends on the size…) for one size…   SAIMA sells these assembled screws in small amount.   Please visit and check our line card https://www.saima.co.jp/en/Product/Machine-Screws-w.php   If you have any problems purchasing in small lots, please contact SAIMA.   Purchasing from below. https://saima-shop.com/pages/310w-washers-all