Grade 8.8 DIN931 Stainless Steel Hex Head Bolt U Bolt

• Material: Stainless Steel/Carbon
• Type: Hexagon Head/Round Head/Square Head
• Connection: Multiple Options
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: INNOVAT
• Head Style: Hexagon Head/Round Head/Square Head
• Standard: DIN, ANSI, GB, JIS, BSW
• Grade: 6.8/8.8/9.8/10.9/12.9/
• Application: Machinery, Environmental, Building
• Finish: Galvanized/Black
• Transport Package: Protect Products First
• Specification: Based on customer requirements
• Trademark: INNOVAT/OEM
• Origin: China
• HS Code: 7318151090
• Production Capacity: 500000pieces/Month

Product Description

Product Description

Bolt is a kind of fastener composed of head and screw (cylinder with external thread). It needs to be used with nut to fasten and connect two parts with through holes. It is an anchoring component that anchors the connected parts to the hardened concrete substrate.

The performance grades of bolts for steel structure connection are divided into more than 10 grades, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. Among them, bolts of grade 8.8 and above are made of low-carbon alloy steel or medium carbon steel and heat treated (quenched and tempered), which are generally referred to as high-strength bolts, and the rest are generally referred to as ordinary bolts. The performance grade of bolts is composed of two numbers, which respectively represent the nominal tensile strength value and yield strength ratio of bolt materials.

For example:
The meaning of bolts with performance level of 4.6 is:
1. The nominal tensile strength of bolt material reaches 400MPa;
2. The yield ratio of bolt material is 0.6;
3. Nominal yield strength of bolt material reaches 400 × 0.6=240mpa grade
High strength bolts with performance grade of 10.9 can meet the following requirements after heat treatment:
1. The nominal tensile strength of bolt material reaches 1000MPa;
2. The yield ratio of bolt material is 0.9;
3. Nominal yield strength of bolt material up to 1000 × 0.9=900mpa grade

The strength grades of 8.8 and 10.9 refer to the shear stress resistance grades of bolts of 8.8gpa and 10.9gpa
     8.8 nominal tensile strength 800n/mm2 nominal yield strength 640n/mm2
Generally, the strength of bolts is expressed by "x.y",
X*100= tensile strength of this bolt,
X*100* (y/10) = yield strength of this bolt
(because according to the identification: yield strength / tensile strength =y/10)
Such as level 4.8
Then the
Tensile strength: 400MPa
Yield strength: 400*8/10=320mpa

Product Parameters

Hexagon bolt as an example:

U bolts as an example



T-bolts as an sample

X	Z	Specification	Part No.	Material	Surface	Weight
20	17	M8X20	MD-HB-A1001	Carbon steel	Zinc/Nickel plated	13.00g
25	22	M8X25	MD-HB-A1002	Carbon steel	Zinc/Nickel plated	14.50g
30	27	M8X30	MD-HB-A1003	Carbon steel	Zinc/Nickel plated	16.00g
40	37	M8X40	MD-HB-A1004	Carbon steel	Zinc/Nickel plated	19.00g
60	57	M8X60	MD-HB-A1005	Carbon steel	Zinc/Nickel plated	25.00g

 

Screw Head Types

 

Point/Thread Styles

Product Display

We produce provide various bolts. If you have any questions, please feel free to contact me.