ANSI/ASME B18.5 Round head bolt

FOB Reference Price:Get Latest Price
$0.10 - $2.00 / Piece | 500 Piece/Pieces (Min. Order)
Carriage Bolts Round head bolts Round Torsional Shear Bolts
Bolts length:
360MM 6 3/4" 11" 90mm 6 1/4" 200mm 18" 6 1/2" 180mm 150mm 220mm
Thread size:
M16 M20 M27 M30 M36 M33 1/2" 1 1/8" 1 7/8" 1 5/8" 2 3/4" 3/4" 2 1/4" 1" 7/8"
Support Sea freight
Lead Time:
Quantity(Pieces) 1 - 500 >500
Est. Time(days) 10 Negotiable
Customized logo (Min. Order: 500 Pieces)
Customized packaging (Min. Order: 500 Pieces)


Graphic customization (Min. Order: 500 Pieces) Less
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Quick Details
ZINC, Plain
Steel, 40Cr,35CrMo,42CrMo,B7,4140
Place of Origin:
Zhejiang, China
Brand Name:
Model Number:
Product name:
ANSI/ASME B18.5 Round head bolt
SAE J429 Gr2 5 8
Surface treatment:
Black,Zinc plated,H.D.G.,Dacromet,Geomet,Phophated
Head type:
Round head
Mechanical Machine
Delivery time:
10-25 Days
Supply Ability
Supply Ability:
100000 Piece/Pieces per Month
Packaging & Delivery
Packaging Details
25kgs each carton,36cartons each pallet,sea worthy
Shanghai,Ningbo port
Lead Time :
Quantity(Pieces) 1 - 500 >500
Est. Time(days) 10 To be negotiated
Product Description


Product NameANSI/ASME B18.5 Round head bolt
StandardANSI/ASME B18.5
Material 40Cr,35CrMo,42CrMo,4140,40CrNiMo
Grade8.8,10.9,12.9,SAE 5,8,ASTM A325,490,449,B7,L7
Surface FinishPlain,Black,Zinc,H.D.G.,Phosphate,Dacromet,Geomet
Packaging & Shipping

  25kgs each carton,36cartons each pallet,sea worthy

Company Information

Zhejiang Goodnail Fastener Manufacturing Co., Ltd. Located in the historical and cultural city-Shaoxing, nearby to Shanghai and Ningbo Port. which enjoying convenient geographical advantage and smooth logistics.

Our company entered the fastener industry in 1995. After 15 years of struggle and growth, it has the ability to produce high-end fasteners. In order to have better and sustainable development of the company, Zhejiang Goodnail Fastener manufacturing was registered in 2011. Co., Ltd. specializes in the development, production and sales of high-end fasteners and custom-made precision parts.

Our company's production plant covers an area of more than 10,000 square meters, and the R&D Center covers an area of more than 200 square meters. The factory has hot forging, fine finishing, heat treatment and other workshops. It has more than 200 sets of advanced production and testing equipment, with an annual output of more than 8,000 tons of high-end fasteners. Small batches, multi-variety, large diameter, and fastener products up to 3 meters long are the company's specialty. The company is equipped with 80 tons, 125 tons, 250 tons, 400 tons of punching machines, medium and high frequency automatic temperature control heating equipment, high precision CNC lathes, milling, planing, grinding, drilling and other special equipment, large thread rolling machines and length Heat treatment equipment within 6 meters. More than 120 employees, more than 20% of the total number of technical personnel in colleges and universities. Among them, there are one professor-level senior engineer and four senior engineers.

Our main products include high-end 8.8S, 10.9, 12.9S, specification range M12-M120, 1/2"-4" bolts, studs and custom-made parts.The products are widely used in various wind turbines, petrochemicals, marine engineering, automobiles, nuclear power, rail transit, high-end complete sets of machinery and equipment, and can adapt to various high temperature, low temperature and corrosion resistance. The products are exported to all over the world and are highly appreciated.Warmly welcome the customers all over the world to contact us!



Our Services


01:High-strength, high-temperature and corrosion-resistant fastener materials are available in stock. The main materials are: 35CrMo, SCM435, 42CrMo, 40CrNiMo, B7, B16, 25Cr2MoVA, 2205, B8, B8M, A286, 660, 06Cr18Ni11Ti, 38CrMoAIA, X6NiCrSiCe35- 25, X8CrNiTi18-10, X6NiCrTiMoVB25-15-2, N08800, N08825 and so on.



02:Wide range of products: main products include high-end 8.8S, 10.9, 12.9S, specification range M12-M120, 1/2"-4" bolts, studs, special-shaped parts (Seiko workshop, turning,

milling, grinding, drilling matching equipment) Auxili-ary equipment); suitable for production of small batches, m-ulti-variety orders, super long, oversized products.



03:trong technical force, the company's quality assurance system is

sound and standardized; strict implementation of four 100% quality


100% material ultrasonic flaw detection,

100% product magn-etic particle inspection,

100% hardness non-destructive testing,

100% spectral chemical composition qualitative testing.

Years of experience in the manufacture of wind power fasteners has enabled us to havethe ability and strength to produce high-end fasteners.


04:Complete testing equipment: the company is equipped with

200T tension machine, spectrometer, axial force machine, met-allographic analyzer, low-temperature impact machine, magn-etic powder flaw detector, rockwell, vickers hardness tester and other testing equipment.Complete testing equipment, for the safe and reliable escort products.




Our Core Products include:

Top quality Grade10.9,12.9 Hex bolt,Socket Cap Screw,Stud bolt and Nut for Petrochemical and Offshore Industry(High temperature and Low temperature resistant,corrsion resistant),Wind Power Fasteners and ustom-made Parts.



Our advantage:

Big size,Extra long

Seiko workshop, turning,milling, grinding, drilling matching equipment

Top quality,Precison, and Custom-made

Strict implementation of four 100% quality cntrol: 100% material ultrasonic flaw detection, 100% spectral chemical composition qualitative testing,100% product magn-etic particle inspection, 100% hardness non-destructive testing.




Mechanical Properties

Comprehensive analysis, the key factors affecting bolt performance are:

1. Chemical composition of materials, inclusions, microscopic metallographic structure, decarburization and carbon increase, phosphorus-rich layer;

2. Processing technology

3. Guaranteed load

4.Tensile strength, yield strength, toughness

5. Hardness (heart, surface and special required position)

6. Thread tip shape, size and position tolerance

7.Shape size

8.Chamfer, inclination, support surface inside, outside diameter and shape tolerance

9. Excessive head shape size, finishing thread shape size, screw end shape

10. Width of head to side, diagonal, and height (driving size)

11. Head firmness

12. Anti-loose performance

13. Surface protection and corrosion resistance

14. Friction coefficient

15. fatigue strength

16. Manufacturing defects, such as cracks

17. Other special performance requirements such as high temperature resistance and low temperature performance.


Delivery time:15-20Days

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