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LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Battery Positive Terminal Bolts

Hello folks,

Can anybody confirm the size of the bolts that secure cables to the standard battery positive terminal, please? I'm pretty sure that they're M6 but have a nagging doubt that they might be M8

Many thanks

Click image to enlarge Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

12th Jan 2021 11:28am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17603

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

I seem to recall that they are M8 flange head, but this is based on an (a) my (senior citizen) memory and (b) inspection of my stock of HD crimp terminals, neither of which is a particularly reliable method.

Update: I've just checked the parts catalogue which lists an M8 screw for the megafuse but makes no mention whatsoever of the flange head screws holding the non-megafused leads to the clamp assembly. These screws don't seem to be identified anywhere, so presumably in the tiny brains of the LR directorate should only be supplied as part of the £80+ battery clamp assembly.

It seems likely however that if the megafuse terminals are M8, the others are too (but remember my caveat above).

12th Jan 2021 11:48am

Badger110

Member Since: 06 Feb 2018
Location: South hams
Posts: 1039

2011 Defender 110 Puma 2.4 USW Buckingham Blue

M8 or 7.9 according to my cheap digi calliper 😂

12th Jan 2021 11:57am

Pacha

Member Since: 23 Feb 2020
Location: North Yorkshire
Posts: 772

2008 Defender 90 Puma 2.4 HT Stornoway Grey

Yep, M8. Rgds.

Chris

12th Jan 2021 12:04pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Ah ha, thanks chaps! Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

12th Jan 2021 1:01pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2138

The easiest way to check a bolt size if you can access to the bolt head or nut is to see what socket / spanner fits it. I.e an m6 bolt head / nut will be a 10mm socket / spanner and an M8 will be a 13mm socket / spanner. You get a rare one off bolt that has a larger or smaller head but the vast majority of nuts and bolts follow the standard metric sizes, tables of which can be found on the web.

Now I know all the posters on this thread know the above, so just highlighting for others that may not. And guessing that on a cold wet winters day, like me, LRA would rather ask the question on here than start pulling the truck apart to see what socket fits

12th Jan 2021 1:02pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Hi Ian,

You're right about not wanting to go diving under the seat box! Unfortunately though, LR have a habit of using odd sized bolts. e.g. M8 thread but with a 10mm head for instance, so it's not always clear cut

Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

12th Jan 2021 1:07pm

Dinnu

Member Since: 24 Dec 2019
Location: Lija
Posts: 3480

2012 Defender 90 Puma 2.2 CSW Santorini Black

Yes, and M6 with 8mm head across flats. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black

12th Jan 2021 1:23pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2138

LRA, I’m assuming you are looking to connect leads for an Anderson connection or CTEK connection outside the battery box. I’m contemplating the same for trickle charging etc so are you thinking of connecting the positive to one of the two bolts and perhaps doing the bolt mod on the earth clamp so you have a longer bolt on the earth clamp (so it can be tightened down correctly) then the additional ring connector for the new cable placed on top and a second nut to clamp that down ? If so then you could do the same clamp bolt mod on the positive terminal.
These are options running through my mind at present, so people’s views on those options would help in my deliberations.

12th Jan 2021 1:28pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6641

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

You can clearly see from the caliper photo, that's an M8 bolt with a 10mm AF hex head above the flange.

1988 90 Td5 NAS soft top

2015 D90 XS SW

12th Jan 2021 1:30pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Ianh wrote:
LRA, I’m assuming you are looking to connect leads for an Anderson connection or CTEK connection outside the battery box. I’m contemplating the same for trickle charging etc so are you thinking of connecting the positive to one of the two bolts and perhaps doing the bolt mod on the earth clamp so you have a longer bolt on the earth clamp (so it can be tightened down correctly) then the additional ring connector for the new cable placed on top and a second nut to clamp that down ? If so then you could do the same clamp bolt mod on the positive terminal.
These are options running through my mind at present, so people’s views on those options would help in my deliberations.

Yeah, it's an Anderson connector I'm planning for. I've already fitted a longer bolt to the earth terminal to allow a second battery connection and there's capacity there for another ring terminal. I want to use the supplied bolts on the positive terminal though, as I don't want to mess up the fitting of the rubber boot. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

12th Jan 2021 1:41pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17603

Ianh wrote:
The easiest way to check a bolt size if you can access to the bolt head or nut is to see what socket / spanner fits it. I.e an m6 bolt head / nut will be a 10mm socket / spanner and an M8 will be a 13mm socket / spanner. You get a rare one off bolt that has a larger or smaller head but the vast majority of nuts and bolts follow the standard metric sizes, tables of which can be found on the web.

Now I know all the posters on this thread know the above, so just highlighting for others that may not. And guessing that on a cold wet winters day, like me, LRA would rather ask the question on here than start pulling the truck apart to see what socket fits

Sadly this rule-of-thumb falls flat on its face when LR in their wisdom use flange head fasteners, which is something they do a great deal. A flange head fastener generally has an AF size one standard size smaller than a conventional hex head fastener of a standard size, so in this case an M8 thread fastener, which would normally have a 13mm AF head, has a 10mm AF head (10mm being the next "standard" size down from 13mm, of course).

You will also find a lot of fasteners on modern Landrovers (and on other vehicles, especially Jap ones) that are non-preferred sizes, which is a major pain in the whatnot. For example, there are several metric thread fasteners on a Defender with a 12mm AF head instead of a 13mm AF head.

On Defenders we have the additional thrill of still having Unified and British Standard thread forms. Your front axle, for example, has a bizarre combination of metric standard, UNF and BSF threads, all of which require different size spanners!

12th Jan 2021 6:03pm

Co1

Member Since: 19 Aug 2018
Location: North Yorkshire
Posts: 3698

I used to have an old Peugeot that was littered with 5 sided bolt heads. That was an utter pain in the wheel nuts I can tell you!

12th Jan 2021 6:56pm

Pacha

Member Since: 23 Feb 2020
Location: North Yorkshire
Posts: 772

[quote="blackwolf"]

Ianh wrote:

You will also find a lot of fasteners on modern Landrovers (and on other vehicles, especially Jap ones) that are non-preferred sizes, which is a major pain in the whatnot. For example, there are several metric thread fasteners on a Defender with a 12mm AF head instead of a 13mm AF head.

On Defenders we have the additional thrill of still having Unified and British Standard thread forms. Your front axle, for example, has a bizarre combination of metric standard, UNF and BSF threads, all of which require different size spanners!

Further compounded when the fitting involves a nut and bolt & the bolt head is a different size to the nut

Rgds.

Chris

12th Jan 2021 7:13pm

rockster57

Member Since: 15 Nov 2014
Location: West Yorkshire
Posts: 937

2011 Defender 110 Puma 2.4 CSW Zermatt Silver

Co1 wrote:
I used to have an old Peugeot that was littered with 5 sided bolt heads. That was an utter pain in the wheel nuts I can tell you!

Now that bit of info interests me. Wondering whether this is a potential for reasonably priced security fasteners

12th Jan 2021 7:51pm

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