High Tensile Fasteners for exhaust systems
Structural steel grade Bolts for exhaust systems
High tensile fasteners such as bolts are known to have a strength of about 1200 Mpa. Being the highest grade as compared to commercial or structural grade bolting, high tensile ones are used in those applications where high mechanical strength is a property that is deemed important.
Often, Structural steel fasteners are required to be treated with an external coating or a polishing to either add value or to improve some of its properties. Common finishes performed on high tensile include Zinc phosphate, Geoment and Dacromet, Flouro carbon coating and oiled. Usually zinc based finishes such as Zinc plating with white / blue / yellow / green / black passivations or even Hot dip galvanisation results in an increase in the corrosion resistance properties. Zinc based finishes also protect from getting oxidised, which in turn ensures good performance when exposed to harsh environments. Hence, they are less likely to incur mechanical damage.
Since structural bolts are designed to be strong, they won’t break easily under pressure. These grade 12.9 Bolts are intended to be used for the heaviest jobs.
|DIN||931, 933, 5785, 5A325, GB5782, A6914, 5783, 786|
|Main Forms||Hex, Unf/ Unc, U Bolts|
|Industry Standards||ASTM, IS, JIS, ASTM, GB5783, DIN, ANSI, AS, BSW, ASME, EN, DIN, DIN931, BS, ISO4017|
|Size||M2 – M100, 6 to 500mm Length|
- Zinc Plating for Bolting products
- Xylan Coating
- Cadmium Plating
|Grade/ Marked Symbol||Proof Load (MPa)||Min. Yield Stress (MPa)||Min. Tensile Stress (MPa)|
High Tensile Bolts Equivalent Grades Guidelines
|Grade||Technical Description||Metric Size|
|8.8||quenched and tempered, medium carbon steel material||16- 72mm|
|10.9||quenched and tempered, alloy steel material||5 - 100mm|
|12.9||quenched and tempered, alloy steel material||1.6 - 100mm|