Structure Screw or bolt and nut plate Locknut Aluminum Terminal and Jumper Washer A Washer B Washer C Cadmium-plated steel or aluminum Cadmium-plated steel or aluminum Cadmium-plated steel or aluminum Cadmium-plated steel or aluminum None None or  magnesium alloy Cadmium-plated  steel Cadmium-plated  steel Cadmium-plated  steel or aluminum Magnesium-alloy Cadmium-plated steel Corrosion-resisting steel Cadmium-plated  steel Cadmium-plated  steel Cadmium-plated steel Cadmium-plated steel Aluminum alloys Magnesium alloys Cadmium-plated  steel Corrosion-resisting  steel Aluminum alloys Magnesium alloys 1 Cadmium-plated  steel Corrosion-resisting  steel  Cadmium-plated  steel Cadmium-plated  steel Cadmium-plated steel Corrosion-resisting steel or Cadmium-plated steel Tinned Copper Terminal and Jumper Cadmium-plated steel Cadmium-plated steel Corrosion-resisting steel or cadmium-plated steel Cadmium-plated steel Cadmium-plated steel Cadmium-plated steel Cadmium-plated steel Cadmium-plated steel Cadmium-plated steel Cadmium-plated steel Cadmium-plated steel Corrosion-resisting steel Aluminum alloys 2 none none $^{1}$Avoid connecting copper to magnesium. $^{2}$Use washers with a conductive finish treated to prevent corrosion, such as AN960JD10L. Lockwasher Terminal (limit to 4) Locknut Screw or bolt Washer A Washer B Washer C Structure Figure 9-146.  Bolt and nut bonding or grounding to flat surface. Lacing and Tying Wire Bundles Ties, lacing, and straps are used to secure wire groups or  bundles to provide ease of maintenance, inspection, and  installation. Straps may not be used in areas of SWAMP,  such as wheel wells, near wing flaps, or wing folds. They  may not be used in high vibration areas where failure of the  strap would permit wiring to move against parts that could  damage the insulation and foul mechanical linkages or other  moving mechanical parts. They also may not be used where  they could be exposed to UV light, unless the straps are  resistant to such exposure.  [Figure 9-147] The single cord-lacing method and tying tape may be used  for wire groups of bundles 1 inch in diameter or less. The  recommended knot for starting the single cord-lacing method  Figure 9-147.  Wire lacing.  9-88