DEFENDER2.NET - View topic - Steering box thread size

↓ Advertise on Defender2 ↓

Home · FAQ · New Posts · My Posts · PMs · Search · Members · Map · Calendar · Profile · Donate · Register · Log In

Home > Technical > Steering box thread size

Page 1 of 1

Print this entire topic ·

John P

Member Since: 26 Dec 2013
Location: West Sussex
Posts: 322

2012 Defender 90 Puma 2.2 SW Corris Grey

Steering box thread size

Does any know what the thread size is on the drop arm of a 4 bolt steering box? After removing the drop arm, the threads are slightly damaged, so want to run a die over it to clean up the threads. It appears to be 1.75 pitch and measures a fraction over 22mm. So is it a M22 with a pitch of 1.75, or is it a non-metric thread?

Thanks
John

23rd Jul 2023 1:13pm

diesel_jim

Member Since: 13 Oct 2008
Location: hiding
Posts: 6102

Googling shows the nut is part # NH614041 and I get this info:

Nut, Hex - UNF - Thread Dia in 1/16" (14/16th = 7/8") - length in 1/8" (4/8ths = 1/4")

23rd Jul 2023 5:08pm

John P

Member Since: 26 Dec 2013
Location: West Sussex
Posts: 322

Great thanks for that. After a lot of measuring, and trying to understand non-metric (I'm a metric person) it does appear to be UNF 7/8 x 14 thread. So I've ordered a tap and die. Will report back when they arrive.

24th Jul 2023 9:39am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17458

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

diesel_jim wrote:
... Nut, Hex - UNF - Thread Dia in 1/16" (14/16th = 7/8") - length in 1/8" (4/8ths = 1/4")

Seldom if ever have I seen such a jumble of confused and meaningless non-data!

This is why the Internet needs to be treated with care!

Not a dig at Diesel Jim, by the way, but a dig at wherever this rot came from.

24th Jul 2023 1:11pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

Jim's decoded the nut's part number according to the British Leyland code:

http://vitessesteve.blogspot.com/2015/10/h...s-etc.html

1988 90 Td5 NAS soft top

2015 D90 XS SW

24th Jul 2023 1:59pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17458

Interesting link, thank you, I was unaware of this.

If the PN is NH614041, using the link the p/n decodes as follows:

N = Nut
H = Hex
6 = thread = UNF
14= diameter in units of 1/16" = 14/16" = 7/8"
0 = Steel
4 = medium tensile (precision)
1 = undefined, possibly revision number.

So it is 7/8" UNF steel full nut, probably SAE-5(8.8 ), in which case it would take a 1.5/16" AF spanner. If it was a 7/8" UNF 'heavy' steel full nut, the spanner size would be 1.7/16"AF.

24th Jul 2023 3:28pm

John P

Member Since: 26 Dec 2013
Location: West Sussex
Posts: 322

The socket I used to take the nut off was indeed a 1.5/16″AF. I got it here, when I bought my Sumo bar upgrade.

https://gwynlewis4x4.co.uk/product/defender-drop-arm-socket/

24th Jul 2023 3:43pm

John P

Member Since: 26 Dec 2013
Location: West Sussex
Posts: 322

My Tap and Die arrived today, and I can confirm that it is the right size. So nicely cleaned up the nut, having tried to fit it and it didn't fit, and cleaned the spindle thread.

26th Jul 2023 12:28pm

Screbble

Member Since: 26 Apr 2015
Location: Lancashire
Posts: 2108

2004 Defender 90 Td5 XS CSW Zambezi Silver

All very interesting information and definitely invaluable for the future 👍

30th Jul 2023 8:46am

Page 1 of 1

All times are GMT

Jump to

< Previous Topic | Next Topic >

Posting Rules

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum