Fun Fact*

The safety belt hardware on a Volkswagen T5 kombi is threaded 7/16 x 20TPI.

The socket heads are 10mm triple-square, a.k.a. XZN.

There has to be a rational explanation for this, but I don’t have it.

* Actual Fun Might Vary

2026-10-01 by A Plague of T5s Cars Geek 2

2 Responses

  1. Greg Menounos says:
    2026-10-01 at 18:32

    https://www.paruzzi.com/en/seat-belt-bolts-7-16-unf/3068
    “Since the 1960s, these requirements have been standardized, and seatbelt mounting bolts must have an American UNF thread.”

    Reply
  2. wrm says:
    2026-10-05 at 08:18

    Thanks Greg, that’s interesting, but it doesn’t answer the “why”? Was it just too much trouble to do the same tests with metric hardware? Are metric threads too coarse, maybe, so if you have to have a non-standard thread (fine pitch metric) you might as well go UNF?

    Reply

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