What Thread -Seal Belt Anchorage

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Colin Heseltine
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What Thread -Seal Belt Anchorage

Can anybody confirm what thread is used for the seat belt boss behind the drivers right shoulder on a 21 plate 420R.  As it is a metric chassis will this have been changed from the originally used 7/16"UNF.  I do not have any metric fine thread taps and do not want to attempt a 7/16"UNF unless I am certain that is what it is.

Colin

ScottR400D
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Still 7/16" UNF. Certainly according to the recent assembly guides. 
 

Have you damaged one? Why do you need to tap?

Colin Heseltine
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Scott,

Thread not damaged but full of paint.  I did not want to try the tap until was sure what thread it would be.  Going to mount a small bracket on the pillar with a popper base for the half hood side strap to fix to.

Colin

paul richards
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Confirm. 7/16 unf

Paul Richards

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Colin Heseltine
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Paul,

Many Thanks

Colin

aerobod
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The standard for all cars is 7/16" UNF for seat belt anchor bolts, one of the international imperial oddities like wheel diameter in inches and flying altitude in feet (except for Russia and China).

James

Nigel Riches
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Hi Colin, if you only need to remove some paint from the threaded hole you could use a suitable sized bolt and run a half round or triangular file down the treads to form a thread chaser / cleaner,  much cheaper than buying a tap for a one off use.

Colin Heseltine
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Got hundreds of taps including the one needed to clean out the thread.  I just wanted to be 100% certain before running tap down hole.

Colin

rj
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7/16 UNF and it's part of a EU directive, so it won't change. It also is in German cars like the VAG group.

 

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Colin Heseltine
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Got hundreds of taps including the one needed to clean out the thread.  I just wanted to be 100% certain before running tap down hole.

Colin