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ISO4014 Hex Bolt

ISO 4014 Hex Bolts, also known as Hexagon Head Bolts with Partial Thread, are designed for applications requiring strong and reliable mechanical connections. Manufactured according to ISO 4014 standards, these bolts feature a hexagonal head and a partially threaded shank, with the unthreaded section providing improved shear strength and better load distribution compared with fully threaded fasteners. This design makes ISO 4014 hex bolts particularly suitable for structural assemblies and heavy-duty applications where stable clamping force and long-term fastening reliability are important.

The combination of a smooth shank area and threaded section allows ISO 4014 Hex Bolts to achieve effective load transfer between connected components while reducing stress concentration in critical fastening areas. These bolts are commonly produced through processes such as cold heading, thread rolling and surface treatment to ensure accurate dimensions, consistent thread quality and dependable performance. Available in carbon steel, alloy steel and stainless steel materials with different strength classes and finishes, ISO 4014 Hexagon Head Bolts with Partial Thread can meet various requirements in construction, machinery, steel fabrication and industrial equipment applications.

Carbon Steel Black ISO 4014 Hex Bolts
Stainless Steel ISO4014 Hexagon Head Bolts with Partial Thread

Specification:

ISO 4014 Hex Bolts are manufactured according to ISO 4014 specifications, which define the requirements for hexagon head bolts with partial thread. The specification covers important technical aspects including head dimensions, thread dimensions, unthreaded shank length, thread tolerance, material requirements, mechanical properties and surface finishes. The partial thread design is a key feature of ISO 4014 bolts, providing a combination of threaded engagement and smooth shank support for applications requiring strong and stable connections.

Depending on the application requirements, ISO 4014 Hexagon Head Bolts can be supplied in different materials and strength classes, including carbon steel, alloy steel and stainless steel options. Common strength grades include 8.8, 10.9 and 12.9 for steel bolts, as well as A2 and A4 stainless steel grades. The following table shows the main specifications of ISO 4014 Hex Bolts, including standard, material, thread type, strength class and surface treatment options.

Product nameISO4014 Hex Bolts
Head TypeHexagonal Head
Thread DiameterM1.6-M64
Thread Tolerance6g
LengthUp to 800mm
Strength4.8/8.8/10.9/12.9/A2-70/A4-70
MaterialCarbon Steel/Alloy Steel/Stainless Steel/Copper
Surface treatmentZinc Plated/Black Oxidation/Hot Dip Galvanized/Dacromet

Dimension Chart of ISO4014:

The dimension chart of ISO 4014 Hex Bolts provides the key measurements required for proper selection and assembly, including nominal diameter, bolt length, thread length, unthreaded shank length, head width across flats and head height. As hexagon head bolts with partial thread, ISO 4014 bolts have a defined unthreaded section that plays an important role in load transfer and connection stability.

The following dimension chart shows the standard sizes of ISO 4014 Hex Bolts according to ISO requirements. Customers can select suitable bolt dimensions based on the thickness of connected components, required clamping length and application conditions to ensure a secure and reliable fastening connection.

drawing of partially thread hex bolt

Thread Diameter(d)Thread Pitch(P)Width Across Flat (s)Width Across Corner(e) MinHead Height (k)Radius(r) MinWasher Face Thickness(c)Thread Length(b)
L≤125
Thread Length(b)
125<L≤200
Thread Length(b)
L>200
M1.60.353.02-3.23.410.98-1.220.10.1-0.259--
M20.43.82-44.321.28-1.520.10.1-0.2510--
M30.55.32-5.56.011.88-2.120.10.15-0.412--
M40.76.64-77.52.6-30.20.15-0.414--
M50.87.64-7.788.633.26-3.740.20.15-0.51622-
M619.64-1010.893.76-4.240.250.15-0.51824-
M81.2512.57-12.7314.25.06-5.540.40.15-0.62228-
M101.515.57-1617.596.11-6.690.40.15-0.6263245
M121.7517.57-1819.857.21-7.790.60.15-0.6303649
M14220.16-2122.788.51-9.090.60.15-0.6344053
M16223.16-23.6726.179.71-10.290.60.2-0.8384457
M182.526.15-26.6729.5611.15-11.850.60.2-0.8424861
M202.529.16-29.6732.9512.15-12.850.80.2-0.8465265
M222.533-3437.2913.65-14.350.80.2-0.8505669
M24335-3639.5514.65-15.350.80.2-0.8546073
M27340-4145.216.65-17.3510.2-0.8606679
M303.545-4650.8518.28-19.1210.2-0.8667285
M333.549-5055.3720.58-21.4210.2-0.8727891
M36453.8-5560.7922.08-22.9210.2-0.8788497
M39458.8-6066.4424.58-25.4210.3-18490103
M424.563.1-6571.325.58-26.421.20.3-19096109
M454.568.1-7076.9527.58-28.421.20.3-196102115
M48573.1-7582.629.58-30.421.60.3-1102108121
M52578.1-8088.2532.5-33.51.60.3-1-116129
M565.582.8-8593.5634.5-35.521 max-124137
M64692.8-95104.8639.5-40.521 max-132145
M726102.8-105116.1644.5-45.521 max-156169

Application of ISO4014 Bolts:

ISO 4014 Hex Bolts are widely used in applications where strong clamping force, reliable load transfer and durable mechanical connections are required. The partial thread design, combined with the smooth unthreaded shank section, makes these bolts especially suitable for structural connections and assemblies where shear strength and connection stability are important. Compared with fully threaded bolts, ISO 4014 Hexagon Head Bolts provide better support in thicker materials and help achieve secure fastening performance in demanding working conditions.

Typical applications include steel structures, heavy machinery, industrial equipment, construction projects, transportation equipment and general mechanical assemblies. In steel fabrication and engineering applications, ISO 4014 Hex Bolts are commonly selected for connecting steel plates, frames and components that require high-strength fastening. Available in different materials, strength classes and surface finishes, these bolts can be adapted to various environments, including outdoor, industrial and heavy-duty applications.

Manufacturing & Quality Control of ISO 4014 Hex Bolts:

The manufacturing process of ISO 4014 Hex Bolts involves multiple controlled steps to ensure dimensional accuracy, mechanical performance and consistent product quality. Production begins with the inspection of raw materials to verify chemical composition and material grade. During manufacturing, processes such as cold heading, thread rolling, machining and heat treatment are carefully controlled to ensure accurate hexagon head dimensions, proper thread formation and stable mechanical properties.

Quality control is implemented throughout the entire production process, rather than only during final inspection. Key inspections include dimensional verification, thread gauge testing, hardness testing, tensile strength testing and surface quality inspection. For bolts requiring enhanced corrosion resistance, surface treatments such as zinc plating, hot dip galvanizing or other coatings are also inspected to ensure coating quality and durability.

Before shipment, ISO 4014 Hex Bolts undergo final inspection according to customer requirements and applicable standards. Inspection records, material certificates and test reports can be provided to ensure full traceability and reliable performance. Through strict manufacturing control and quality management, we ensure that each batch of ISO 4014 Hex Bolts meets the requirements for industrial and structural fastening applications.