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Step 61: BNAE or French Recess

Picture of BNAE or French Recess
0475 french recess or bnae bit.jpg
0475 bnae.jpg
0475 BNAE bit.jpg
[[br]]Also called BNAE NFL22-070 after its Bureau de Normalisation de l'Aeronautique et de l'Espace standard number. Possibly a security screw drive system. Easily confused with a JIS or Frearson recess screw but with driver blades are modified into two step diameters.[[br]]
 
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