Titanium Lug Bolts: RADIUM Product Release - LotusTalk - The Lotus Cars Community
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post #1 of 35 (permalink) Old 07-11-2011, 12:37 PM Thread Starter
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Titanium Lug Bolts: RADIUM Product Release


These new RADIUM Engineering lug bolts are machined from forged 6AL-4V (Grade 5) Titanium alloy rod. They feature a 60 degree tapered conical seat compatible with most OEM and aftermarket wheels. The threads are rolled, not machined, for superior strength and wear resistance. Grade 5 Titanium is 94% the yield strength of metric grade 10.9 (OEM lug bolt steel) and are also over 43% lighter than steel.

Bottom Left: 16 Steel Lotus Elise Lug Bolts
Bottom Right: 16 Titanium Radium Lug Bolts


Radium Lug Bolt Mechanical Properties:
Grade 5 6AL-4V Titanium
Yield Strength: 890MPa
Ultimate Tensile Strength: 952MPa
Shear Strength: 550MPa
Elongation: 15%
Reduction of Area: 31%
Density: 4428 kg/m^3



Other common lug nut/bolt materials:
Grade 5 Alloy Steel
Yield Strength: 634MPa
Ultimate Tensile Strength: 827MPa
Shear Strength: 496MPa
Density: 7861 kg/m^3

Grade 8 Alloy Steel
Yield Strength: 896MPa
Ultimate Tensile Strength: 1034MPa
Shear Strength: 620MPa
Density: 7861 kg/m^3

7075 Aluminum
Yield Strength: 503MPa
Ultimate Tensile Strength: 572MPa
Shear Strength: 331MPa
Density: 2823 kg/m^3


Our titanium fasteners come in Anodized Green or Nano Ceramic Hardened Gray with a laser etched logo.


They are a direct swap and simple installation for the Lotus ELISE, EXIGE and EVORA.


Click the link below to visit the product page.
Titanium Lug Bolts


Last edited by Radium; 07-11-2011 at 02:06 PM.
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post #2 of 35 (permalink) Old 07-11-2011, 01:32 PM
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130 ksi yield for those of us that don't live so close to the queen . Cool product!

Seriously, my car is small
07 Exige-S, "Landshark"
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post #3 of 35 (permalink) Old 07-11-2011, 06:39 PM
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Are there any anti-theft features on them so that expensive wheels (and lug nuts!) don't get stolen?
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post #4 of 35 (permalink) Old 07-11-2011, 08:01 PM
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wondering if you'll have clear anodized. the natural dark tint of Ti is awesome.

** save ~10 lbs gain 1 hp ** EQ: Y=(190*X) / (1984-X) where Y is (HP) and X is (lbs)

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post #5 of 35 (permalink) Old 07-11-2011, 09:06 PM Thread Starter
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Quote:
Originally Posted by Riddlefox View Post
Are there any anti-theft features on them so that expensive wheels (and lug nuts!) don't get stolen?
These are all standard 17mm hex. We do not have custom locking lug bolts.

We are considering offering more/different finishes depending on what is requested the most. But at this time, we only have the green and the nano-ceramic gray.
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post #6 of 35 (permalink) Old 07-12-2011, 01:32 AM
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Wonder if they crack under extreme vibration.
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post #7 of 35 (permalink) Old 07-12-2011, 04:30 PM
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Most Ti is not very susceptible to corrosion, so there should be no benefit to applying a surface finish such as anodizing.

I assume therefore the purpose is to give a certain look.

Phantom Black 2007 Exige S
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post #8 of 35 (permalink) Old 07-12-2011, 05:06 PM
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What are the torque specs for these? Also, what kind of durability testing has been done on them?
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post #9 of 35 (permalink) Old 07-12-2011, 06:24 PM Thread Starter
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You are correct, the surface finish is for appearance, although our manufacturer has expressed that the ceramic finish increases the durability in extreme harsh environment use (marine, etc).

Our manufacturer is an ISO9001 certified facility and among many other quality assurance processes, does random tensile testing during manufacturing to ensure material is consistent.

These fasteners are not a new concept, there are many titanium fasteners holding wheels on all sorts of cars; street, drag, road race, you name it. We are just finally making them accessible in the Lotus market. We have experience with alternative metals for wheel fastening and over the years have never experienced a single issue.

These should be torqued to 70-75 ft-lb.
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post #10 of 35 (permalink) Old 07-12-2011, 07:04 PM
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I am assuming the price is per bolt.

2006 Elise, Graphite Grey/Red leather, Sport Elise Suspension, Cup airbox, ECU ref lash, MonoBalls, etc. etc.
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post #11 of 35 (permalink) Old 07-14-2011, 11:53 AM
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According to your website, the thread length is 22mm. I thought the standard thread length was 25mm? Also, they need to be even longer (28mm according to the Lotus parts fiche) if you have the AP Racing brakes. 22mm must be fine for the standard brakes (or you wouldn't be selling them), but are you going to offer longer ones for cars (like mine) with the AP Racing brakes?

TIA,

-Ed
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post #12 of 35 (permalink) Old 07-14-2011, 01:40 PM Thread Starter
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Yes, our current Ti lug bolts are a direct replacement for the stock steel lug bolts found on the standard brakes of the Elise/Exige. With my caliper, the stock bolt thread length measures 22mm. The standard rear hub rotor thickness of the female threads is 22mm as well.

We have longer lug bolts designed for vehicles utilizing spacers and big brakes as well as for the Lotus EVORA. Check our website regularly for when these will be available.

RADIUM Engineering
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post #13 of 35 (permalink) Old 12-28-2011, 11:40 AM Thread Starter
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After selling out rather quickly, we now have these titanium lug bolts fully restocked.

Titanium Lug Bolts

We have also added a new 28mm thread length in Nano Ceramic Gray only.

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post #14 of 35 (permalink) Old 02-13-2013, 04:25 PM
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Quote:
Originally Posted by Radium View Post
Yes, our current Ti lug bolts are a direct replacement for the stock steel lug bolts found on the standard brakes of the Elise/Exige. With my caliper, the stock bolt thread length measures 22mm. The standard rear hub rotor thickness of the female threads is 22mm as well.

We have longer lug bolts designed for vehicles utilizing spacers and big brakes as well as for the Lotus EVORA. Check our website regularly for when these will be available.

RADIUM Engineering
i would like to buy some. but i have questions. i didn't see a ph# on the web site. did i just miss seeing it?
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post #15 of 35 (permalink) Old 02-13-2013, 07:19 PM
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a
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post #16 of 35 (permalink) Old 02-14-2013, 08:27 AM
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maybe someone else can help. in the picture on the left (bolts on scale) i count 15 threads. and on the right i count 12 threads. are they both for an elise? im ready to buy but i want a full diameter of engagement. does anyone have experience with the titanium bolts?
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post #17 of 35 (permalink) Old 02-14-2013, 09:59 AM
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Titanium Lug Bolts: RADIUM Product Release

Radium used to sell two lengths of titanium bolts - they specified 22mm for Elises and 28mm for Evoras. So the picture is from when they sold two sizes. Their web site now lists just one bolt length at 28 mm. The 5-spoke Y wheels on 2011 Elises need the 28mm bolts.

Radium probably switched to one size to simplify stocking a low-volume item. Or I'm all wet and they've made an error on their web site��

Here are the old 22mm titanium bolts:



Glen

(edited to add bolt lengths)

2011 Lotus Elise SC

Last edited by Glen; 02-14-2013 at 10:20 AM.
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post #18 of 35 (permalink) Old 02-14-2013, 10:11 AM
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Good catch.
They Ti bolts are shorter so they weight savings should be slightly less for a bolt at the same length.
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post #19 of 35 (permalink) Old 02-14-2013, 10:26 AM
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thank you glen. i just ordered a set so i guess we'll see
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post #20 of 35 (permalink) Old 02-14-2013, 12:53 PM Thread Starter
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Glenn is correct. Awhile back Radium had 22mm thread length Ti bolts. Now we stock 28mm only as they will work in both scenarios including your buddy's M3 (shown below)

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