jesus bolt for v1raptor?

[eleewhm]

Alloy meaning mixture of non-ferrous and ferrous material.

But still without hardening process, the material is still considered "soft"....me thinks.

Unless, some metallurgy expert can explain further.....

we can do hardening ourselves also....????

The hardening of these steels, which are made with carbon contents between 0,80% and 1,20%, is quite straightforward: Since the rate of carbide dissolution proceeds rapidly, the holding time, as a consequence, is short and therefore the heating of small tools can often take place without any extra precautions against atmospheric oxidation.

The hardening temperature is about 780°C. Quenching is carried out direct into brine with tempering following immediately. The quenching operation is the most critical part of the heat treatment since too slow a rate of cooling might give rise to either soft spots or quenching cracks.

ferrite...etc etc...i have materials...hehehe

[eleewhm]

since we on this topic...i did some search came up with these..

Materials
Stainless Steel
Stainless steel is an alloy of low carbon steel and chromium for enhanced corrosion characteristics. Stainless steel is highly corrosion resistant for the price and because the anti-corrosive properties are inherent to the metal, it will not loose this resistance if scratched during installation or use.

It is a common misconception that stainless steel is stronger than regular steel. In fact, due to the low carbon content, stainless steel can not be hardened. Therefore when compared with regular steel it is slightly stronger than an un-hardened (grade 2) steel fastener but significantly weaker than hardened steel fasteners.

Stainless steel is also much less magnetic than regular steel fasteners though some grades will be slightly magnetic.

18-8 Stainless
18-8 is a specific grade of stainless steel, and is the most common grade used in fasteners. For those familiar with the 300 series of stainless steel 18-8 is similar to 304 stainless. For more specific information on 18-8 stainless steel please see our Material Grade Identification and Properties Chart.

Steel
Steel is the most common fastener material. Steel fasteners are available plain as well as with various surface treatments such as zinc plating, galvanization, and chrome plating.

Steel fasteners are commonly available in 4 grades. Many other grades exist but are used far less often. The most common grades are Grade 2, Grade 5, Grade 8, and Alloy Steel. Grade 2, 5, and 8 are usually plated with a silver or yellow zinc coating or galvanized to resist corrosion.

Determining Bolt Grade
Bolts of different grades are marked on the head to show what grade bolt they are. For a list of the most common grade markings see our Material Grade Identification and Properties Chart.

Grade 2
Grade 2 is a standard hardware grade steel. This is the most common grade of steel fastener and is the least expensive. Grade 2 bolts have no head marking (sometimes a manufacturer mark is present).

Grade 5
Grade 5 bolts are case hardened. This means that the outside part of the bolt has been hardened but that the bolt was not heated enough to harden the inside portion. This creates a bolt that is fairly hard but not as brittle as a fully hardened bolt. Grade 5 bolts are the most common bolts found in automotive applications. Grade 5 bolts have 3 evenly spaced radial lines on the head.

Grade 8
Grade 8 bolts are fully hardened. This means the bolt has been hardened all the way through. This creates a bolt that is very hard but somewhat brittle. Grade 8 bolts are more likely to snap off than bend under extreme loads. Grade 8 bolts are often found in demanding applications such as automotive suspensions. Grade 8 bolts have 6 evenly spaced radial lines on the head.

Alloy Steel
Alloy steel bolts are made from a high strength steel alloy and are further heat treated. Alloy steel bolts are typically not plated resulting in a dull black finish. Alloy steel bolts are extremely strong but very brittle.

Silicon Bronze
Silicon bronze, often referred to simply as bronze, is an alloy made mostly of copper and tin with a small amount of silicon. Bronze is used primarily in marine environments. It is preferred over stainless in wooden boat construction and re-fastening due to its superior corrosion resistance, and over brass due to its higher strength. Bronze is similar to copper in color and is also sometimes seen in fine woodworking where it is used for its appearance. The main drawback of bronze is its high cost.

Brass
Brass is an alloy of primarily copper and zinc. Brass is highly corrosion resistant and electrically conductive. However, its use as a fastener is somewhat limited due to its relative softness. It is used primarily for its appearance.

looks like stainless steel is nice...but not strong....back goes the black bolts... ...but for those not critical areas...can still use stainless steel ones..

[eleewhm]

alloy steel might still can do...let me search for hardened alloy steel...the black bolts..

[mechplas]

since we on this topic...i did some search came up with these..



looks like stainless steel is nice...but not strong....back goes the black bolts... ...but for those not critical areas...can still use stainless steel ones..

.........Also the jesus bolt under the main gear.

For Visual, Head Picture for reference.

[eleewhm]

found a place selling

Typical marking on socket head

Class 12.9 Alloy steel, quenched and tempered
Tensile Strength Min. (MPa) : 1220 (177,000 psi)
Yield Strength Min. (MPa) : 1100
Proof Load (MPa) : 970


Tensile Strength: The tensile strength of a material is the maximum amount of tensile stress that it can be subjected to before it breaks. This is an important concept in engineering, especially in the fields of material science, mechanical engineering and structural engineering.

Yield strength, or the yield point, is defined in engineering as the amount of strain that a material can undergo before moving from elastic deformation into plastic deformation. Elastic deformation is spring-like deformation, where a material will return to its original shape. The stress felt by a material given a certain strain is defined by linear relationship, with a slope defined by Young's_modulus. If too much strain is applied, the material will deform permanentely, or plastically. The yield point is often defined, due to the lack of a clear border between the elastic and plastic regions, by a .2% offset from the linear region. The point where this offset line intersects the stress-strain curve is yield point.

[mechplas]

found a place selling

Typical marking on socket head

Class 12.9 Alloy steel, quenched and tempered
Tensile Strength Min. (MPa) : 1220 (177,000 psi)
Yield Strength Min. (MPa) : 1100
Proof Load (MPa) : 970


Tensile Strength: The tensile strength of a material is the maximum amount of tensile stress that it can be subjected to before it breaks. This is an important concept in engineering, especially in the fields of material science, mechanical engineering and structural engineering.

Yield strength, or the yield point, is defined in engineering as the amount of strain that a material can undergo before moving from elastic deformation into plastic deformation. Elastic deformation is spring-like deformation, where a material will return to its original shape. The stress felt by a material given a certain strain is defined by linear relationship, with a slope defined by Young's_modulus. If too much strain is applied, the material will deform permanentely, or plastically. The yield point is often defined, due to the lack of a clear border between the elastic and plastic regions, by a .2% offset from the linear region. The point where this offset line intersects the stress-strain curve is yield point.

Very Nice!

I suddenly have a flash back in lecture theatre 21 in SP, Material Technology......I wasn't paying attention......as usual

[eleewhm]

Hope i got it correct

Critical Areas to use Hardened Bolts.
*Jesus Bolt
*Main Blade Bolt ( as what mechplas pointed out )
*Main Rotor Bolt ( as what mechplas pointed out )
*Tail Rotor Bolt
*Main Gear Bolt

[eleewhm]

Very Nice!

I suddenly have a flash back in lecture theatre 21 in SP, Material Technology......I wasn't paying attention......as usual

me too...i also hate Materials Tech...

[X34]

Hi Guys,

The of posting here is very impressive. Let me share some of my experience on bolts and materials.

Stainless steel bolts are nice to have, but use only when corrosion is a problem - it is soft, heavier than high tensile bolts. Should not be use for main mast, and rotor blades or any application with side shear. It is ok for fastening the side frames together.

Alternative to SS is nickel plated high tensile instead of the black coating.

[eleewhm]

Typically in our Market i found out two types selling

Class 10.9
Medium carbon alloy steel, quenched and tempered
Tensile Strength Min. (MPa) : 1040 (150,000 psi)
Yield Strength Min. (MPa) : 940
Proof Load (MPa) : 830

Class 12.9
Class 12.9 Alloy steel, quenched and tempered
Tensile Strength Min. (MPa) : 1220 (177,000 psi)
Yield Strength Min. (MPa) : 1100
Proof Load (MPa) : 970


so which is more brittle??... lol

[eleewhm]

found another location which sells these Class 10.9/12.9 screws/bolts

PS Fasteners Pte Ltd
Blk 3, Kaki Bukit Road 2,
#01-06/07 Eunos Warehouse Complex,
Singapore 417837
Tel: (65) 6747 7080/6743 0135 Fax: (65) 6742 0642

[eleewhm]

list of screws i getting...lol

[mechplas]

Typically in our Market i found out two types selling

Class 10.9
Medium carbon alloy steel, quenched and tempered
Tensile Strength Min. (MPa) : 1040 (150,000 psi)
Yield Strength Min. (MPa) : 940
Proof Load (MPa) : 830

Class 12.9
Class 12.9 Alloy steel, quenched and tempered
Tensile Strength Min. (MPa) : 1220 (177,000 psi)
Yield Strength Min. (MPa) : 1100
Proof Load (MPa) : 970


so which is more brittle??... lol

According to the theory that I read today in here, the answer should be the one with lower YS, since it deforms plastically after that point.

[eleewhm]

lol...yup...so it will so call " stretch" when approaching failure...

[mechplas]

lol...yup...so it will so call " stretch" when approaching failure...

We should be in Poly now...........sure get distinction....