HARDENED STEEL WOODSCREWS (Supafast range) The Nettlefolds Supafast range of hardened woodscrews has been developed for the more demanding applications. Product features include:- e Fast helix twinstart threadform for fast, balanced screw insertion e@ Sharp point for easy starting. @ Deep threadform to avoid splitting of timber @ Through hardened to enhance performance and reduce screw abuse. DESIGN CONSIDERATIONS 4 in many applications the Supafast range of screws can be used without pilot holes especially in all soft woods and some hard wood applications. In the case of harder timbers pilot holes may be required. Pilot Hole sizes and spacing Article No. 503 Countersunk Supascrew CLEARANCE HOLE APPROX. EQUAL TO NOMINAL SCREW DIA. LENGTH OF SCREW 'L PILOT HOLE 2 Toobtain the maximum performance from the woodscrews, spacing and edge distance needs to Hard Woods Saft Woods High Density Boards Low Density Boards be considered {tis recommended that the following Screw Sue | P* Tpit T Nearest | Pilst Nearest spacing guidelines are used.- - Hole "7 Delt Sizes . Hole . Deitl Sizes wa 1 +g [mm a3 [mm i] No orin.| mm | mm. | No.orin. Spacing of Woodscrews 3 24 |] 300] 15 15 No 53 Onven without Onven into 4 27,300 | 17 ~ ~ - Predniled Holes Pre-dnited Holes 4 $ 31 400 ; ; > Ne 44 16 16 16 Distance from end 20D 10D s 35 | 4% Distance from edge 5D 5D 7 38 | 450 | 24 24 3/32 17 17 No 51 Distance between lines of 10D 3D 8 42 | 550 | 25 25 No 40] 18 18 No 50 screws 10 49 | 600 | 28 28 No 35 | 20 20 5/64 Distance along the grain 20D 00 12 | 56 | 800 | 32 32 va | 24 24 332 between adjacent screws * Pis the amount by which the pilot hole 1s shorter than the screw length (see diagram} TYPICAL APPLICATIONS The design of the Supafast products with its combination of sharp point, twinstart steep pitch threadform makes them ideal for a wide range of applications into both soft and hard woods Iike oak, beech and mahogany. It can also be used into chipboard, melamine faced chipboard and medium density fibre board The fact that the products through hardened means that in soft wood and some hard wood applications no pilot hole ts necessary. Unlike the conventional woodscrew Supascrew has a steep pitch to the threadform which makes the screw very fast and easy to insert D = Diameter of Woodscrew