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HomeAircraftHelicopterMain Discussion › Which bolt is harder and stronger?
06-09-2012 05:18 AM  6 years agoPost 1
rudyy

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E. Amherst, NY

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A Grade 5, 6AL4V Titanium Bolt or a Stainless Steel bolt

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06-09-2012 05:48 AM  6 years agoPost 2
P.I.Engineer

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Kent, WA

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please google and post material specs, then i'll tell you

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06-09-2012 06:04 AM  6 years agoPost 3
rudyy

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E. Amherst, NY

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Titanium:

Grade 5, also known as Ti6Al4V, Ti-6Al-4V or Ti 6-4, is the most commonly used alloy. It has a chemical composition of 6% aluminium, 4% vanadium, 0.25% (maximum) iron, 0.2% (maximum) oxygen, and the remainder titanium.[5] It is significantly stronger than commercially pure titanium while having the same stiffness and thermal properties (excluding thermal conductivity, which is about 60% lower in Grade 5 Ti than in CP Ti).[6] Among its many advantages, it is heat treatable. This grade is an excellent combination of strength, corrosion resistance, weld and fabricability. Consequently, it is used extensively in Aerospace, Medical, Marine, and Chemical Processing[7] E.g.internal combustion engine connecting rods and surgical implants.[5] Generally, it is used in applications up to 400 degrees Celsius.
It has a density of roughly 4420 kg/m3, Young's modulus of 110 GPa, and tensile strength of 1000 MPa.[8] By comparison, annealed type 316 stainless steel has a density of 8000 kg/m3, modulus of 193 GPa, and tensile strength of only 570 MPa.[9] And tempered 6061 aluminium alloy has 2700 kg/m3, 69 GPa, and 310 MPa, respectively.[10]

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06-09-2012 06:33 AM  6 years agoPost 4
nismoflip

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Union City, CA, USA

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between what you listed, the 6al-4v has the higher strength

145 ksi vs 83 ksi ultimate tensile strength

the 316 steel is stiffer with Youngs modulii of:

16e6 psi vs 28e6 psi for steel

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06-09-2012 01:35 PM  6 years agoPost 5
fastflyer20

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N. Tonawanda, NY

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From Mcmaster, both grade 5 and Ti 6AL4V have the same yield strength of 120,000 psi. You would need to specify which SS you are considering, it can range from 30,000 to 300,000 psi.

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06-09-2012 04:11 PM  6 years agoPost 6
lazerface

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Michigan

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i heard that SS has a hard time with lock-tight?

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06-09-2012 05:34 PM  6 years agoPost 7
Heli 770

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USA.

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Use primer.

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06-10-2012 10:36 PM  6 years agoPost 8
Richardmid1

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Leeds, England

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You want aircraft grade Titanium, not sure what grade it is though!

Whats wrong with high tensile steel bolts 10.9 or 12.9?

60% of the time, it works every time!

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06-10-2012 11:47 PM  6 years agoPost 9
TheWoodCrafter

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Costa Mesa, Ca.

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Do Stainless Steel bolt come graded?

And what the heck are you going to do with a Titanium bolt?

A regular Grade 8 steel bolt is stronger and way cheaper.

Thanks, TheWoodCrafter

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06-11-2012 03:54 AM  6 years agoPost 10
greenboot

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Marblehead, OH

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Common fasteners are:
Hardware store grade, used where strength is not an issue
Grade 5, typical "automotive" bolts
Grade 8, common high strength fasteners
Stainless steel, used where corrosion may be a problem
Chrome plated, use for appearance

Tom

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06-11-2012 04:41 AM  6 years agoPost 11
Havoc

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Ky.

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As I'm sure you already know but will post here anyway for the kids, you shouldn't just arbitrarily replace bolts on a helicopter with another material without doing all the math. For example, Do NOT use stainless to replace Jesus bolts, grips, or spindle bolts. Although I've seen some people try. The question I always ask is if the change will make you more or less likely to take a blade to the testicles. If the answer is more, then wear a steel lined cup with Ceradyne ceramic plate or keep stock. If less, then go for it balls out.

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06-11-2012 04:54 PM  6 years agoPost 12
Justin Stuart (RIP)

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Plano, Texas

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Stainless steel is great in places where you want the bolt to bend rather than snap. I like to hold my landing gear on with stainless steel bolts so that if you hit them hard, the SS bolts bend and can still be removed. Black oxide steel will break off inside the machined part.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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06-11-2012 05:26 PM  6 years agoPost 13
Chris Bergen

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cassopolis, MI USA

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Grade 12.9 alloy bolts are the way to go. If you want them pretty, get the Zinc Plated ones!!

Chris D. Bergen

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06-11-2012 06:12 PM  6 years agoPost 14
MN_heli pilot

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Burnville, MN -US

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http://www.boltdepot.com/fastener-i...rade-Chart.aspx
You want aircraft grade Titanium
Calling something aircraft grade is more of an advertising trick than anything.

The only reason you would want to look into Titanium bolts is if you need to save weight and the bolts on a rc heli wouldn't give you much of a weight savings to make it worth doing.

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06-11-2012 06:26 PM  6 years agoPost 15
sonnyhad

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Holland,Mi

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What Chris said! 12.9

Bald Pilots usually wear hats!

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06-11-2012 06:35 PM  6 years agoPost 16
Brokenlink

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Oakdale

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Stainless steel is great in places where you want the bolt to bend rather than snap. I like to hold my landing gear on with stainless steel bolts so that if you hit them hard, the SS bolts bend and can still be removed.
What kind of landing gear do you use,when I hit hard,either the landing gear itself breaks or part of the lower frame is broke.Just put some zip ties on there then.

Jamie Griffith

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06-11-2012 07:51 PM  6 years agoPost 17
rexxigpilot

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Florida

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Nylon bolts work better than zip ties for mounting the LG. They don't let the LG move around all sloppy but will typically break before your frame will.

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06-11-2012 09:41 PM  6 years agoPost 18
Richardmid1

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Leeds, England

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Calling something aircraft grade is more of an advertising trick than anything.
Like I said I don't know the actual grade that is used on aircraft but we have some at work and it is extremely tough although that could be down to the heat treating/hardening process.

We also have some extremely soft Ti which machines almost like Aluminum.

60% of the time, it works every time!

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