HIGH STRENGTH METRIC AND ANSI HEX HEAD BOLTS ,Hot dipped galvanized ,ZINC OR BLACK
Gmetal is one of the leading Chinese high stregth bolt manufacturer with extensive experience in the Structural Steel,Infrastructure,Agricultural Equipment、Marine，Oil & Gas、Solar Energy and so .
Our expertise are manufacturing and exporting carbon steel hex bolts and stainless steel hex bolts ,both metric hex bolts and ANSI/ASME bolts ,black or black oxide high strength hex bolts ,hot dipped galvanized hex bolts grade 8.8,10.9 or 12.9,titanium hex bolts ,special bolts ,structural bolts and nuts and washers with the best factory delivery and price .
A hex cap screw is a high-precision external-threaded fastener featuring a hexagonal head, engineered for secure and reliable joining of mechanical components. Designed to be tightened or loosened with standard wrenches (e.g., open-end, socket, or adjustable wrenches), it is distinguished by its precise dimensional tolerances, robust load-bearing capacity, and wide compatibility across industrial applications. Available in both external hex (hex head) and internal hex (socket head) variants, it caters to diverse assembly requirements.
- Material:Low Carbon Steel ,Alloy Steel ,1008,1035,1039 ,1045,4140
- Grade :4.8,8.8,10.9,12.9,B7(grade 8,grade 5 and grade 2 )
- Thread :Half Thread or Full Thread
- Application :Industrial or Building & Construction Fasteners for steel structural ,Heavy machinery ,Solar energy ,oil and gas ,valves and piping etc
- Package :25kgs/carton,36cartons/pallets or customized package as customer’s requirements .
- Delivery :30-45days for regular production .
- Customized hex bolts dimensions can be produced by samples or drawings .
For Hexagon head bolts dimensions ,drawing and weight ,please contact us at sales@gmetalparts.com
TYPES OF HEX BOLTS
- Flange Hex Bolts
- Hex Head Bolts
- Hex Tap Bolts
- Hex Cap Bolts
- A325 Heavy Hex Bolts
- Hex Structual Bolts
HEX BOLT MANUFACTURER/METRIC HEX BOLTS DIN931,DIN933/ANSI HEX BOLT /ISO4014,ISO4017
As one of the professional hex head bolt manufactuers in China ,Gmetal manufacture different types of hex head bolts ,hex flange bolts ,carrige bolts ,hex structural bolts in regular dimentions and sizes ,if you couldnot find the bolts you want in our page ,please contact us directly with your requirements .
HIGH STRENGTH HEX BOLT MANUFACTURING / BOLT CHINA
As a hex bolts manufacturer and hex head bolt suppliers, Gmetal produce different types of hex bolts in our production lines, specially Metric & ANSI hex bolt, black hex bolt, HDG hex bolt, Stainless steel hex bolts, structural hex bolts, titanium head bolts etc. Small boxes or standard exporting cartons package are available.
Gmetal is one of the reliable China fasteners manufacturer and supplier, especially for high strength bolt and nut manufacturing, as well as bolt & nut supply, so if you want to figure out what is a hex bolt, where to buy metric bolts, or how to find a bolt factory in China, you can find your answer easily in our company page or write to us directly for further details like hex head bolt dimensions chart or hex head bolt weight chart.
What is a hex bolt?
A hex bolt has a six-sided hexagonal head, tightened with a spanner or wrench. It usually pairs with hex nuts and washers for secure fastening. Common types include hex cap bolts, hex tap bolts, hex flange bolts, hex structural bolts, and heavy hex bolts.
Gmetal is one of reliable manufacturer and supplier in China . If you want to find a professional and reliable factory and supplier for hex bolts, you can definitely count on us
Which country manufactures the most bolts?
The world’s top five fastener exporters are Germany, China, the U.S., Japan, and Italy. As the second-largest exporter of iron fasteners (including bolts, nuts, screws, studs, pins, rivets, etc.), China holds 16% of the global iron fastener export market. Gmetal is a professional Chinese bolt manufacturer , offering comprehensive fastener solutions lie bolts, nuts, studs etc for steel structures, oil & gas, valves, piping, automotive, and energy applications.
What are Hex Bolts Standard?
Hex bolt standards including Din933,DIN931,ISO4014,ISO4017,ASME B18.2.1 different in half or full thread hex bolts, and one is DIN and ISO standard,another is ASME standard .
What are the bolt standards (properties)?
ISO 898 – 1:2013 is essentially a standard focusing on the mechanical and physical properties of carbon steel and alloy steel bolts, screws, and studs, and it does not directly specify the complete dimensional details of hex bolts like head width or shank length. However, it defines critical dimensional constraints related to the thread structure of hex bolts and references other ISO standards for diameter – pitch matching. Meanwhile, some derivative application data related to hex bolt dimensions can be derived from its scope of application and supporting specifications.
What are the characteristics of hex bolts?
Hex bolts are characterized by their six-sided hexagonal heads, available in both partial and full thread configurations.
They come in metric sizes conforming to ISO/DIN standards and inch-based dimensions aligned with ANSI/ASME specifications, with corresponding thread pitches for each sizing system. The mechanical strength grades are clearly marked on the bolt heads—ranging from 4.6 to 12.9 for metric-grade bolts and from Grade 2 to Grade 8 for inch-series variants—to indicate their load-bearing capacity.For enhanced durability and corrosion resistance, hex bolts can be finished with a variety of surface treatments, including hot-dip galvanizing, zinc plating, black oxide coating, Dacromet, Geomet, and Teflon coating.To obtain accurate and formal quotes from bolt manufacturers or factories, you must provide essential details: the applicable product standard, exact dimensions, strength grade, and required surface finish.
What does M mean in bolt sizes?
M stands for metric thread, which is the core symbol of the metric thread system .The M marking is the key to distinguishing metric bolts from inch-system bolts (used in ANSI/ASME standards).
“The complete marking of a metric bolt is usually in the form of M[nominal diameter]×[pitch]×[length]. For example:
M12×1.75×50: Represents a bolt with a nominal thread diameter of 12 mm, a coarse thread pitch of 1.75 mm, and a shank length of 50 mm.”
What does 10.9 mean on a bolt?
The 10.9 marking on a bolt denotes its metric mechanical property class, defined by the international standard ISO 898-1:2013. It is a high-strength grade, suitable for heavy-load applications, and the two digits correspond to specific tensile and yield strength values .There are also have 8.8 ,12.9 grade ,these high strength bolts are widely used in construction, agricultural irrigation ,industrial, energy, oil & gas, automotive, marine etc. Gmetal specialized in bolt & nut supply for different applications, if you need suggestions on bolts selection, please feel free to contact us, and we will reply you within 24hours .
What does ASTM mean bolts?
ASTM, short for the American Society for Testing and Materials, is one of the world’s leading authorities on bolt standards. Its specifications cover carbon steel, alloy steel, and stainless steel bolts, with a particular focus on products engineered for high-strength, high-tensile, high-pressure, and high-temperature operating conditions. Gmetal’ s manufacturing facilities are fully equipped to produce and supply bolts that comply with stringent ASTM standards.
What is the difference between 8.8 and 10.9 bolts?
The core differences between 8.8-class and 10.9-class bolts lie in mechanical properties, material requirements, heat treatment processes, and application scenarios.Both are metric property classes defined by ISO 898-1:2013, widely used in industrial and structural fastening.8.8-class bolts are the mainstream choice for general construction and machinery projects due to their cost-effectiveness.
10.9-class bolts are in demand for high-end applications like large infrastructure projects or heavy equipment manufacturing, but require strict quality control during production to avoid hydrogen embrittlement failures. Gmetal can produce these bolts.
What is ASTM A193 gr B7?
ASTM A193 Grade B7 (abbreviated as A193 B7) is a high-strength alloy steel bolt specification defined by the American Society for Testing and Materials (ASTM), specifically designed for high-temperature, high-pressure, and heavy-load industrial applications. Gmetal have lots of customers and experienced in these applications .If you are looking reliable thread rods or studs material ASTMA193 B7, please feel free to send us RFQ list at sales@gmetalparts.com
Are hex bolts screws? Why is a hex bolt classified as a “bolt” rather than a “screw”?
No, a hex bolt is not strictly a screw. Hex bolts are designed to be used with a matching nut for fastening two or more components, while screws usually tap into a threaded hole directly without a nut. Both are threaded fasteners but differ in installation methods and applications.Sometimes we called hex bolt to be hex cap screw ,because bolt can be big screw . A bolt requires a matching nut to fasten components, while a screw is directly driven into a threaded hole without a nut.
Why is ISO 4014 the mainstream international standard for hex bolts instead of others?
ISO 4014 is a globally accepted metric standard for hex bolts, covering key parameters like dimensions and tolerances, and is recognized by most countries in South America, Africa, and Belt and Road regions. Other standards (e.g., DIN, ASTM) are mostly region-specific.
Why are strength grades (e.g., 8.8, 10.9) marked on the hex bolt head?
Head marking allows quick identification of strength grades without additional testing, enabling direct differentiation during installation and quality inspection to avoid safety risks from misusing low-strength bolts. Sometimes customers want to mark his name on the head .
Why can ASTM hex bolts (e.g., A325) not be directly interchanged with ISO-standard bolts?
ASTM uses inch threads (UNC/UNF) with strength marked by standard codes, while ISO uses metric threads (M-series) with strength marked by numerical grades. Their dimensions and thread specifications are incompatible.
Why are 8.8-class hex bolts more suitable for heavy-load applications than 4.6-class ones?
8.8-class bolts have a minimum tensile strength of 800 MPa and yield strength of 640 MPa, much higher than 4.6-class bolts (400 MPa tensile, 240 MPa yield), enabling them to bear heavier loads and are strengthened by heat treatment. To manufacturer high strength bolts is Gmetal’s advantage and high strength bolt is our main products .welcome you to ask us at any time if you have questions by sales@gmetalparts.com
Why is hydrogen embrittlement relief required during the production of 10.9-class hex bolts?
10.9-class bolts are made of alloy steel and tend to absorb hydrogen during heat treatment and electroplating, which can cause brittle fracture. Hydrogen embrittlement relief (baking at 200-230°C for 2-4 hours) removes hydrogen and improves safety.
Why do Dacromet-coated hex bolts have better corrosion resistance than zinc-plated ones?
Dacromet coating is an inorganic layer of zinc-aluminum flakes that uniformly covers the bolt surface without hydrogen embrittlement risk, with a salt spray resistance of over 1000 hours. Zinc plating is thinner, with salt spray resistance of only 72-144 hours, and may cause hydrogen embrittlement in high-strength bolts.
Why are hot-dip galvanized hex bolts used for outdoor steel structures instead of electroplated ones?
Hot-dip galvanizing has a coating thickness of ≥55μm with strong corrosion resistance, suitable for outdoor, humid, and highly corrosive environments. Electroplating has a thin coating that is prone to peeling and cannot withstand long-term outdoor corrosion. These high strength Hot dipped galvanized bolts which Gmetal supplied widely used in solar project ,Infrastructure and construction projects ,Agricultural and water conservancy facilities etc and got customer’s confirmation .
Why are cold heading processes used for hex bolt heads and shanks instead of cutting?
Cold heading preserves the continuity of metal fibers, improving bolt strength and toughness, with high production efficiency and material utilization. Cutting processes break metal fibers, reduce strength, and have higher costs.
Why must customers provide four parameters (standard, grade, specification, coating) when requesting a quote?
These four parameters determine the bolt’s production process, material cost, and quality standards. Without any one parameter, it is impossible to accurately calculate the price, and the delivered products may not meet requirements.Although bolts are just a small component, they play a crucial role in the entire project. Gmetal has always adhered to the principle of quality first, providing customers with the best quality bolts.
What material is a hex bolt?
There are carbon steel hex bolts, alloy steel hex bolts and stainless steel hex head bolts. It depends on customers’ actual requirements.
What are the different types of bolt heads?
Gmetal manufacture different types of bolts including hexagon head bolts, Flange Hex Head,Socket Head Cap Screw (Allen Head),Button Head bolt ,Countersunk Head bolt (Flat Head),Square Head bolt
What are bolts without heads called?
Fasteners without a head are referred to as set screws, studs, or double-ended studs. They are generally fully threaded and feature no integrated bolt head. In addition to being renowned for manufacturing hex bolts, Gmetal also produces studs and threaded rods.
Where can I buy metric bolts?
Whether you need metric bolts or ANSI/ASME standard bolts, Gmetal can provide you with the highest quality products at the most competitive prices, including matching nuts. As a professional bolt manufacturer based in China, we specialize in supplying a full range of bolts and nuts for global customers.
If you are looking for reliable metric bolt suppliers, you’ve come to the right place! Feel free to contact us at any time—we are dedicated to providing you with premium products and excellent service.
FAQ of Hexagon Head Bolts
1. Are you a hex bolts manufacturer?
Yes, Gmetal is a bolt factory, hex bolts manufacturers and suppliers, as well as leading fasteners manufacturers in china.
We mainly porduce black oxide hex bolts,Hot dipped galvanized hex bolts , Socket head cap screw, metric hex head bolts, stainless steel hex head bolts etc.
2. How long is your delivery time for black hex head bolts?
It takes 7-10 days for stock products. For bulk order, it will be in 30-60 days according to the order quantity.
3. Can we have samples for metric hex head bolts?
Yes, free samples are available, if you have a courier acount like DHL/FEDEX/UPS to collect the samples.
4. Can we use our own head mark or customize package for hex head bolts?
Yes, Gmtal as a hex bolts manufacturers, we can customize headmark and package, please send the requirements when place order.
5. How can we make an order for metric hex head bolts?
Just inquiry on our page or send a email to jenny@gmetalparts.com
For hex head bolt dimensions or weight chart for din 931, din933, iso 4014, iso 4017 ,astm a325 ,as1252 pdf, please feel free to contact us.
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