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Bolt supplier for M7 e-torx head


HoSS

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I need to fix my modified inlet manifold to the OM606, and the space is very limited.

I cant use the standard MB torx bolts as theres no room to drive from above, and i can't use hex head as theres no diameter to get a spanner on.

So have have come to the conclusion i need e-torx head. But trying to find that in M7 is like rocking horse poo (except in titanium which costs 10 quid each)

image.jpeg.7f14f2f62d0bf0ae427dd73e1c9518b2.jpeg

Any ideas on suppliers?

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No theres only about 20mm above the bolt, so no room for a key or socket, it needs something thats done up with a ring spanner, But not enough diameter to get a 9mm ring spanner on between the leaders. Its very tight.

Has to be 12-point or e-torx.

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7 minutes ago, landroversforever said:

20mm would be plenty for a shortened hex key?

Considered that - but before the (25mm) bolt is driven in, theres virtually nothing, and with slight misalingnment/fricton its not easy to wind them in by fingers. 

The MB bolts i have are Torx and you cant shorten a Torx key.

Will be far easier to use e-torx or 12-point, they are out there just a question of cost/lead time.

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1 hour ago, HoSS said:

The MB bolts i have are Torx and you cant shorten a Torx key.

Spoken like a man without a welder :ph34r:

I have one of these, which might make it low profile enough:

Wera Bit-assortiment, Tool-Check PLUS, 39-delig, 05056490001: Amazon.nl

The bit goes directly into the ratchet, really allows you to get into tight spaces.

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Yes i bought that Wera 1/4" hex ratchet last week, its still too tall to work.

Thanks for all of the ideas, but it will be far easier with e-torx or 12-point, since they do exist what i need is supplier suggestions.

Racebolt have them (as above link from landroversforever) but only 8 in stock at the moment. Will back order or from US ebay supplier i found,

 

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Feels to me that this is a situation where a stud is more suitable, then you can find nuts more easily:

https://www.ebay.co.uk/itm/M7-Twelve-Sided-HEX-FLANGE-NUTS-10-ST-Chromed-Rims-Screw-/184642991298?_trksid=p2349624.m46890.l49286

Alternatively, drill out and shove an M8 tap down it, and then the bolt or stud world is your oyster. 

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How about a better full shank Torx bit with an open ended 1/4 inch spanner

I've use this before for tight spots

 

20210503_182041.thumb.jpg.ff4b023278393783268426267dcc2c68.jpg

 

This needs about 10mm of clearance to use as you can cut off the unneeded shank.

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3 hours ago, steve b said:

From the above pic , why not chop the driver bit at the lower edge of the yellow band and use a ratchet ring spanner on the remaining hex ?

Steve  

Considered that, but there are a few places where the diameter of the rachet end is too big, and again there still too little height before the bolt is driven.

2 hours ago, Bowie69 said:

Feels to me that this is a situation where a stud is more suitable, then you can find nuts more easily:

https://www.ebay.co.uk/itm/M7-Twelve-Sided-HEX-FLANGE-NUTS-10-ST-Chromed-Rims-Screw-/184642991298?_trksid=p2349624.m46890.l49286

Alternatively, drill out and shove an M8 tap down it, and then the bolt or stud world is your oyster. 

Yeah thats a possible, will look into it. Problem i suspect is that M7 nuts will be 9mm and the 9mm ring still too big dia to get between some of the leaders, hence why i wanted reduced head.

1 hour ago, zardos said:

How about a better full shank Torx bit with an open ended 1/4 inch spanner

I've use this before for tight spots

 

20210503_182041.thumb.jpg.ff4b023278393783268426267dcc2c68.jpg

 

This needs about 10mm of clearance to use as you can cut off the unneeded shank.

Considered that, but the though of winding down 14 bolts 15 deg at a time with the bit constantly falling out didnt fill me with much enthusiasm. Plus open-ended too big dia.

Could weld on into a 1/4" ring though.

Thanks will investigate your ideas Zardos & Bowie

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As a thought, just seen m7 bolts are a common fitment on BBS split rims , might be worth looking in that direction, 

 

Main thing is for the love of baby Jesus, say no to stainless 

#chromewontgetyouhome

#saynotostainless

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7 minutes ago, RedLineMike said:

As a thought, just seen m7 bolts are a common fitment on BBS split rims , might be worth looking in that direction, 

Yeah thats what i found in that link above, split rim bolts. Problem is i dont want stainless in the alu head, which leaves titanium at 10Eur a piece, and for some reason not widespread in europe.

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18 hours ago, HoSS said:

Picture/1000words... You can maybe see what i mean, no way to drive from above.

 

space.jpg

A picture definitely helps.

A very similar access issue can be found with a couple of the screws that secure the older type Rover V8 oil pump housing. That uses 1/4" UNC reduced head 12 pt screws. There is just about enough room to get in with a 5/16" ring spanner.

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