Home/Screws/Window Fabrication Screws/Other Window Screws/CSNK Machine Screws CSNK Machine Screws CSNK head metric thread machine screws.For fitting window hardware into pre-tapped holes in UPVC section. Available sizes: M5 x 20mm M5 x 30mm M5 x 40mm BZP Plating. Category: Other Window Screws Tags: CSNK head, Machine screws, Metric thread Related products Chipboard ScrewWood Screws Traditional Brass Woodscrews.Wood Screws Weather Bar ScrewOther Window Screws A2 Stainless Steel WoodscrewsWood Screws