SHS Jointing, Flowdrill & Hollo-Bolt - Tata Steel

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Drilling machine parameters : Table 1 gives a guide to required machine parameters for producing Flowdrill holes for M12 to M24 bolts: Note: The Flowdrill process is not suitable for hand held or magnetic clamp type drilling equipment when used in the sizes shown. Max material thickness (mm) Flowdrill detailing requirements. See Fig. 3 and Table 3. Note: 3 5 6 8 10 12 16 Table 2 ● Flowdrilled joints used at locations exposed to the weather should not be considered as water tight. ● Flowdrilling is not suitable for use with pre-galvanised materials. Dimensions (mm) A 1 B 1 C 1 D 1 E 1 Minimum Min Bolt Centres M12 Short Long Long Long - - - Flowdrill Length M16 Short Short Long Long Long - - Thread Size M12 7 13 18 30 M20 Short Short Short Long Long Long - Lb tp M24 Short Short Short Long Long Long - tc M16 10 17 20 40 Thread size Flowdrill size M/c spindle speed rpm M/c feed rate Motor power KW Min Tapping speed rpm Table 3 (See Fig. 3 for nomenclature) M12 10.9 1000-1500 2 250 M16 14.8 700-1100 Table 1 Drill length: The recommended length of Flowdrill bits varies with the thread size and thickness of material as given in Table 2. Drill care: Flowdrills are made from tungsten carbide. They are extremely hard but cannot withstand shock loads. After drilling each hole, FD KS paste should be applied to the Flowdrill whilst it is still hot, so minimising oxidation and preventing ‘build up’ on the surface. Flat surface: the raised rim on the outer surface of the RHS material caused during Flowdrilling should be removed using Flowdrills with cutting edges provided on the collar. One rotation of the cutter is all that is required to remove the rim. B 1 C 1 Width Min bolt centres Thread size/Bolt diameter 2.5 200 M20 18.7 600-1000 3.5 150 M24 22.5 500-800 0.1/0.15mm (0.004/0.006 inches) per rev M20 12 22 26 Varies with overall bolt length (Lb) specified C 1/2 + t c (for connection made to a single face or opposite faces) B 1/2 + A 1 + D 1 + t c (for connection made to adlacent faces) A 1 D 1 50 E 1 M24 15 25 29 60 5 100 Fig. 3 E 1
Hollo-Bolt Hollo-Bolt HOLLO-BOLT is a pre-assembled three part fitting consisting of body, cone and bolt. The pre-assembled unit (Fig. 4) is inserted through normal tolerance holes in both the attatchment plate and the RHS. As the bolt is tightened the cone is drawn into the body, spreading the legs, and forming a secure fixing. Once installed only the Hollo-Bolt head and collar are visible (Fig. 5). The Hollo-Bolt Location Flats Body Cone Knurling Further information on Hollo-Bolt is available from Fig. 5 Fig. 4 Hexagon Head Collar Fixture RHS Cone Legs Central Bolt Lindapter International A Division of Victaulic plc., Lindsay House, Brackenbeck Road, Bradford, West Yorkshire, Tel: 01274 521444 England, BD7 2NF Fax: 01274 521130
Page 1 and 2: Corus Tubes library publication The
Page 3 and 4: Flowdrill&Hollo-Bolt Flowdrill & Ho
Page 5: Flowdrill Flowdrill The Process Flo
Page 9 and 10: Design of Joints in Simple Construc
Page 11 and 12: Bolt diameter mm M16 M20 M24 Bolt d
Page 13: British Steel Tubes & Pipes PO Box

SHS Jointing, Flowdrill & Hollo-Bolt - Tata Steel

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