TCM 2 1229-Howmet Fastening Systems – Portet sur Garonne (FR) EN4071-053

3 Replies to “TCM 2 1229-Howmet Fastening Systems – Portet sur Garonne (FR) EN4071-053”

1. New sending (comments not visible apparently):

   Since no fatigue tests were carried out on bolts due to bolt length (too short), could you please clearly add that we have a length restriction (up to 9 mm if I am not wrong)? However, this restriction is more or less visible in this qualification.

   Dimensions:
   As per EN4071, thread major diameter “dmax” shall be equal to D1min – 0,025.
   D1min = D1 – 0,035. (MJ5x0,8)
   Dmax = 5-0,035-0,025 = 4,940 mm
   In dimensional test report (FAI), maximum major diameter = 5,000 mm (ISO5855-2).
   Could you just please take into account this?
   Hopefully, actual values are in line with dmax = 9,940 mm.

   Many thanks in advance,
   Best regards.

   Reply

   1. Good Afternoon Julien,

      Concerning the maximum requirement on thread major Ø, I do not consider this note as applicable because the EN4071-053 are D1 oversized bolts .
      D1 min is modified by the EN4016 to 5.265, so dmax should be 5.240mm, obtain such maximum thread major Ø is not possible.

      Have a nice day.
      Best regards,
      Quentin BRETON

      Reply

2. Good afternoon Quentin,
   I fully agree with your answer, thread major diameter calculation as per EN4071, table 1, note a) is not applicable for oversized bolts.
   When I wrote this comment, I considered the “nominal” D1, but we shall add 0,3 mm to D1 to get oversized bolts.
   Approved from my side.
   Best regards.

   Reply