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{"title":"Zinc Plated DIN251 8.8 Hexagon Socket Flange Head Allen Bolt","imgUrl":"https:\/\/img.chinax.com\/nimg\/f9\/5e\/4a8952e09bde2d93fa6fdc878ed9-200x200-1\/zinc_plated_din251_8_8_hexagon_socket_flange_head_allen_bolt.jpg","attrs":{"Brand Name":"YB","Model Number":"DIN251","Certification":"ISO9001","Place of Origin":"ZheJiang,China"}}
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{"title":"Metric Hexagonal Socket Bolts Grade 8.8 12.9 Cheese Head Bolt","imgUrl":"https:\/\/img.chinax.com\/nimg\/6d\/ab\/17b1b0e56fd758d0a4926717a156-200x200-1\/metric_hexagonal_socket_bolts_grade_8_8_12_9_cheese_head_bolt.jpg","attrs":{"Brand Name":"YongBiao","Model Number":"BS 4168-1","Certification":"ISO9001","Place of Origin":"ZHEJAING CHINA"}}
Zinc Plated DIN251 8.8 Hexagon Socket Flange Head Machine Bolt
Product Description
Standard:DIN251
DIN 251 hexagon socket flange head machine screws are German DIN standard specialized fasteners engineered for industrial mechanical fastening, renowned for their integrated anti-loosening structure, high connection stability and standardized dimensional design. As a mainstream choice for medium and high-load fastening scenarios, this type of machine screw features a one-piece hexagon socket drive and flange head structure, eliminating the need for additional washers in assembly. Paired with the industry-common 8.8 grade mechanical performance and zinc-plated anti-corrosion treatment, DIN 251 screws are widely adopted in various industrial assembly fields with strict requirements for connection firmness and installation efficiency.
Core Features:
Integrated structure saves assembly time: The flange head replaces the traditional flat washer and spring washer combination, reducing the number of assembly parts and improving fastening efficiency;
Strong anti-loosening performance: The flange surface is designed with anti-slip serrations (optional for standard models), which can effectively prevent the screw from loosening due to mechanical vibration, ensuring long-term connection stability;
Wide compatibility: Standardized DIN 251 dimensions cover mainstream metric thread specifications (M3-M24), adapting to the fastening needs of different industrial workpieces and equipment;
Easy operation: The hexagon socket drive is compatible with universal standard hexagon socket wrenches, with no special tool requirements, and is suitable for narrow and confined installation spaces.
Application Scenarios:
DIN 251 8.8 grade zinc-plated hexagon socket flange head machine screws are a versatile industrial fastener, widely used in automobile manufacturing, construction machinery, machine tool equipment, sheet metal cabinet production, electrical and electronic equipment, hydraulic and pneumatic components, and automation equipment assembly. Typical application scenarios include engine component fastening, gearbox assembly, sheet metal cabinet connection, hydraulic cylinder fixed installation, electrical panel mounting, and engineering machinery structural part fastening. It is the preferred fastener for mechanical fastening scenarios that require high connection stability, anti-loosening performance and assembly efficiency, and is favored by industrial manufacturers for its standardized design and reliable performance.
Technical Specifications
d
M3
M4
M5
M6
M8
M10
P
0.5
0.7
0.8
1
1.25
1.5
dk
min
5.2
6.78
7.72
9.7
12.7
15.7
max
5.5
7
8
10
13
16
k
min
2.75
3.82
4.82
5.7
7.7
9.7
max
3
4
5
6
8
10
dc
min
6.7
8.8
10.7
12.3
15.7
19.7
max
7
9
11
12.6
16
20
c
min
0.8
1
1
1.3
1.8
2
max
1
1.2
1.2
1.5
2
2.2
s
2.5
3
4
5
6
8
t
min
1.3
2
2.5
3
4
5
Teeth
18
18
20
24
24
30
Packaging
Carton Packaging
Outer Cartonbox Packaging
Pallet Packaging
Bolts are packed in neutral packaging boxes, with standard quantities arranged in small cartons. The exact number of units per carton will be confirmed with the customer to align with their specific requirements. Customized packaging configurations are available upon request.
The small cartons are then consolidated into larger master cartons for secure transportation and storage. The quantity per master carton can be customized based on client specifications or aligned with standard logistical requirements.
The palletized units are securely wrapped with waterproof film and reinforced with packaging straps. Customer-specific shipping marks or labels are affixed to each pallet, ensuring clear identification and compliance with logistics requirements. This final packaging stage guarantees weather-resistant protection and stability during transportation.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Trading Company
Year Established:
2012
Total Annual:
5000000-6000000
Employee Number:
45~53
Ecer Certification：
Verified Supplier
Ningbo Yongbiao Fastener Manufacturing Co., Ltd. is located in Ningbo, the second largest port city in China. The factory is 50 kilometers away from Ningbo Port and can reach the sea freight warehouse in one hour, with very fast logistics. The company was founded in 2012 and after years of hard work... Ningbo Yongbiao Fastener Manufacturing Co., Ltd. is located in Ningbo, the second largest port city in China. The factory is 50 kilometers away from Ningbo Port and can reach the sea freight warehouse in one hour, with very fast logistics. The company was founded in 2012 and after years of hard work...
