A recent posting revealed some difficulty in sourcing bolts for gliders. I didn’t think they were that arcane. Basic Sailplane Engineering (BSE) says that “All German and some other European gliders use bolts that have been manufactured to a DIN specification.” (p.1.5.1) and that the most common bolt meets DIN 931. So how easy is it to buy such a bolt?
Din 931 has been superseded by ISO 4014-2011, Hexagon head bolts-product grade A and B. This is identical to AS 1110.1-2000, ISO metric hexagon headed bolts and screws - product grade A and B – bolts. Many Australian fastener suppliers such as Coventry Fasteners (aka Konnect), Tower Fasteners and James Glen supply high tensile steel bolts to AS 1110.1. Stainless steel bolts to DIN 931 are also available. So it seems to be more a matter of bolts for aircraft rather than aircraft bolts. I would expect glider manufacturers to specify bolts, but I could not find any reference to a bolt specification in the maintenance manual for the Duo Discus and PW5 (they were to hand). Where would it be? Graham Graham Holland 27 Johnston Crescent Lane Cove NSW 2066 Australia 02 9427 3282 [email protected]
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