Innensechskantschraube m.Spezialk.M5x3 Graupner 567.35 M5 x 35 mm, nickel-plated steel. Socket-head screw for securing wings etc. The extra diameter of the head flange provides a much larger support area than a normal socket-head screw, and the resultant forces are better distributed to the underlying structure. Used on SOARMASTER, EXPERIENCE and other models.
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