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MGRGPGBG



Member Since: 19 Dec 2017
Location: New York
Posts: 67
United States 2009 Defender 110 Puma 2.4 SW Alpine White
Hitch Adapter Plate
I fabricated a receiver hitch plate that will be mounted on the rear cross member. I am having some trouble with the threaded holes in the cross member. The bottom two I believe are M14 and my bolts seem to go in fine. The top 4 I thought were supposed to be M12 but my bolts do not go in at all. M10 seems very loose and on one of the holes the M10 bolt slide right through. Is it possible that the galvanizing added that much material to the threads that an M12 would not even start in the holes?





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(not sure why the picture keeps rotating 90 degrees off - sorry)
Post #794214 20th Sep 2019 6:56pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17767
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
The four smaller holes are ISO M12 coarse series threads (1.75mm pitch), the two larger ones are ISO M16 coarse series (2mm pitch).

If your chassis is galvanised you will have to "chase" the threads on all the holes before a fastener will fit.
Post #794226 20th Sep 2019 7:45pm
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MGRGPGBG



Member Since: 19 Dec 2017
Location: New York
Posts: 67
United States 2009 Defender 110 Puma 2.4 SW Alpine White
OK - thanks - if that is the case then what I though were M14 threads are actually M16 that are clogged up from galvanizing also! I will get the taps and correct bolts.
Post #794246 20th Sep 2019 8:32pm
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BogMonster



Member Since: 05 Feb 2008
Location: Stanley
Posts: 403
Falkland Islands 2015 Defender 110 Puma 2.2 USW Corris Grey
Definitely M12 and M16, so yes you need a thread tap or two! ---
2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi
Post #794385 21st Sep 2019 9:27pm
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MGRGPGBG



Member Since: 19 Dec 2017
Location: New York
Posts: 67
United States 2009 Defender 110 Puma 2.4 SW Alpine White
Thanks for the help on this topic.
Post #794663 23rd Sep 2019 12:45pm
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