Module 6 (Materials & Hardware) SubModule 6.5 (Fasteners)

Materials hardware category ab1 sub module 65

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– MATERIALS & HARDWARE Category – A/B1 Sub Module 6.5 – Fasteners ISO 9001 - 2008 Approved For Training Purpose Only PTC/CM/B1.1 Basic/M06/01 Rev. 00 6.5 - 70 Mar 2014 Fig. 08 HI-Lock Fastener After the pin is located in its prepared hole, a hexagon-headed collar is turned onto the threaded shank by a box wrench or an ordinary spanner. An Allen Key engages in the recess in the shank end, to prevent rotation of the pin whilst the collar is being tightened and, when a pre-determined load is reached, the hexagonal section of the collar shears off, leaving the pin securely fastened in the hole. Because the collar breaks off at a designated pre-load, the use of torque wrenches is eliminated and three primary design advantages are: Accurate pre-load and torque to within 10%. Minimum size and weight. Rapid, quiet, single-handed operation. Hi-Tigue Fasteners Hi-Tigue fasteners (refer to Fig. 09) are similar to Hi-Loks, excepting that they possess a bead at the bottom of the shank, adjacent to the threaded portion of the fastener. The bead exerts a radial load to the side of the hole which serves to strengthen the area surrounding the fastener hole. This reduces the effect of cyclic loads on the fastener which, in turn, will reduce the effect of the cold working of the joint and minimise the likelihood of subsequent failure. Hi-Tigue fasteners are closed in exactly the same manner as the Hi-Lok types.
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PIA TRAINING CENTRE (PTC) Module 6 – MATERIALS & HARDWARE Category – A/B1 Sub Module 6.5 – Fasteners ISO 9001 - 2008 Approved For Training Purpose Only PTC/CM/B1.1 Basic/M06/01 Rev. 00 6.5 - 71 Mar 2014 Fig. 08 HI-Tigue Fastener Hi-Shear Fasteners A Hi-Shear fastener (refer to Fig. 09) is a close-tolerance pin, which is an interference fit and must be tapped into its hole before the locking collar is swaged on. There are two head styles; one being flat while the other is countersunk. The rivets are closed, either with a special pneumatic pulling tool or by a conventional riveting gun and a special, conical, gun-set. Fig. 09 HI-Shear Fastener SPECIAL PURPOSE FASTENERS In addition to the fasteners already described, other rivet-type fasteners are often used in the manufacture and repair of aircraft. While some of these are designed for a specific use, others may be categorised as ‘High Strength Fasteners’. Typical examples of these special purpose-type fasteners include Jo- Bolts, Tubular Rivets and Rivnuts. Jo-Bolts This is the trade name for a fastener, which is used where a nut and bolt would normally be fitted, but where access is available only to one side of the work. Jo-bolts (refer to Fig. 10) consist of three components; an alloy steel nut (which may be of a hexagonal or countersunk headed type), a hollow steel bolt and a stainless steel sleeve.
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