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F.5.10.1 When Roll Hoop Bracing is mechanically attached:
a. The threaded fasteners used to secure non permanent joints are Critical Fasteners, see
T.8.2. Additional requirements apply in F.5.10.5 and F.5.10.7
b. No spherical rod ends are allowed.
c. The attachment holes in the lugs, the attached bracing and the sleeves and tubes must be a close fit with the pin or bolt.
F.5.10.2 Any non permanent joint at the end(s) must be a Double Lug Joint or a Sleeved Butt Joint
Figure – Double Lug Joint
F.5.10.3 For Double Lug Joints, each lug must:
a. Be minimum 4.5 mm (0.177 in) thickness steel
b. Measure 25 mm minimum perpendicular to the axis of the bracing
c. Be as short as practical along the axis of the bracing.
F.5.10.4 All Double Lug Joints, whether fitted parallel or perpendicular to the axis of the tube, must include a capping arrangement
F.5.10.5 In a Double Lug Joint the pin or bolt must be 10 mm Metric Grade 9.8 or 3/8 in SAE Grade 8
minimum diameter and grade. See F.5.10.1 above
Figure – Sleeved Butt Joint
F.5.10.6 For Sleeved Butt Joints, the sleeve must:
a. Have a minimum length of 75 mm; 37.5 mm to each side of the joint
b. Be external to the base tubes, with a close fit around the base tubes.
c. Have a wall thickness equal to or greater than the base tube(s).
F.5.10.7 In a Sleeved Butt Joint, the bolts must be 6 mm Metric Grade 9.8 or 1/4 in SAE Grade 8