A2-70 Stainless Steel Fastener is recognized by 2 ways, A2 which describe it as being from SS 304 family and 70 which classifies its strength. When we say A2-70 it generally means that the bolt / screw is from SS 304 grade and has an ultimate tensile strength as 70 kg or 700 n/mm2.
How can I tell the hardness of a bolt?
Bolt Grade Markings The common class (grades) for metric are 5.8, 8.8, 10.9 and 12.9. Each grade has a specific bolt strength. No matter the system used to grade the bolts, the higher number means the stronger the bolt.
What are the markings on a grade 2 bolt?
Bolt Grade Markings and Strength Chart
| Head Marking | Grade and Material | Mechanical Properties |
|---|---|---|
| Min. Tensile Strength (psi) | ||
| No Markings | Grade 2 Low or medium carbon steel | 74,000 |
| 60,000 | ||
| 3 Radial Lines | Grade 5 Medium carbon steel, quenched and tempered | 120,000 |
Are Grade 2 bolts hardened?
High Carbon Vs Low Carbon Hardenability Higher carbon steels can be hardened, while low carbon steels are considered non-hardenable. The steel in low-strength ASTM A307 or SAE Grade 2 fasteners is a low carbon grade, such as AISI 1018 or 1020.
How strong is A2-70?
700N/mm²
Therefore, A2-70 is an austenitic, acid proof stainless grade (usually 304 material – 304 or 304L) which has been cold worked to provide a minimum tensile strength of 700N/mm² (MPa).
What does 8.8 mean on the head of a bolt?
So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt’s nominal tensile strength, or 640 MPa.
Which bolt bolt is hardest?
grade 8
Commercial-grade 8 bolts are the strongest option available. They’re made from medium carbon alloy steel and have markings that include six raised dashes. The psi of the bolt is 150,000, meaning that it can withstand great deals of pressure because of the way it was quenched and tempered.
What does 8.8 on a bolt mean?
A property class (PC) is the metric equivalent of a grade in inch series terminology. So, in English, a PC 8.8 bolt is a bolt with a nominal tensile strength of 800 MPa and a nominal yield strength that is 80% of the bolt’s nominal tensile strength, or 640 MPa.
What is the hardest grade bolt?
What is the size of a2-70 bolt material?
Manufacturer of A2 70 Bolt Material according to standard, Check A2-70 Bolt Size Chart Product name A2-70 Stainless Steel Bolts Surface treatment Passivation /plain A2-70 Stainless Steel Bolts Size M2 – M100 A2-70 Stainless Steel Bolts Diameter M3-M60 A2-70 Stainless Steel Bolts Length 6mm-500mm
What is a2-70 stainless steel?
A2 / 304 Stainless Steel Is One Of The Most Highly Corrosion-Resistant Materials Available To The Designer And Engineer. How Do A2-70’s Material Properties Compare To OEM Mild Steel Bolts?
What is the torque of stainless steel hex bolt a2-70?
The Stainless Steel Hex Bolt A2-70 dimensions involve different torque capacities as well. The smaller ones such as the M4 sizes have about 2.7Nm torque while the larger ones have larger torque values.
What is the difference between A2 / astm-304 and a2-70?
DIN/ISO A2 Stainless Steel Is Corrosion Resistant Steel; It Is Also Known As ASTM-304. A2 / ASTM-304 Is An 18/8 Stainless Steel : This Designates A Metallurgical Content Of 18% Chromium & 8% Nickel. A Bolt Marked A2-70 Is A 304 Stainless Steel Bolt With A 700 N/mm2 Tensile Strength (See Below Table).
