Thank you for your cooperation with SAIMA and Export division 310express. After emailed Vol229, we have received many inquiries from customers.   【Why customer uses 310w/washers？】 By expanding bearing surface, it is possible to prevent bearing surface depression. Once depression starts, fastener is loosen easily. Many customers are using these screws in their product. with Spring Washer with Spring Washer + Flat Washer(JIS/ISO) with Spring Washer + Small Flat Washer(JIS/ISO)   Factory must purchase spring washers or flat washers for assembly type many pieces. SAIMA has stock different kind of washer assembled screw as 310w/washers.   310w/washers Applications from our FACEBOOK page https://www.facebook.com/SAIMACORPORATION.E   Please visit our web catalog *310express […]

Thank you for your corporation with SAIMA and Export division 310express. We are proud to present our new line-up of 310 fasteners today! 310w/washers, a screw or bolt with captive washers, would help you to save cost and workload as washers are already assembled and prevent loosing since the screw diameter is larger than washer hole. All in stock, economy pack 100pcs/pack, credit card payment available for quick shipment. Available on online store soon. 310w/washers Catalog(full-line 50items): https://www.310ex.com/image/310w_washers.pdf 310w/washers product page: https://www.310ex.com/product/washer-assembled-fasteners-310w-washers/ Please feel free to contact 310express today: info@310ex.com