Complaint
Fasteners are an essential component of almost every mechanical and construction project. They are used to hold two or more objects together, making sure that they remain in place and function as intended. One type of fastener that is commonly used is the hex nut, which is used to secure bolts and other threaded fasteners. In this article, we will discuss the DIN 934 A194 2H Zinc Plated Hex Nut Metric Thread Fastener, which is a popular type of hex nut used in many applications.
What is a Hex Nut?
A hex nut is a six-sided nut that is used to secure a bolt or screw in place. Hex nuts are one of the most common types of nuts used in mechanical and construction applications. They come in a variety of sizes and materials, and they are designed to fit over the end of a bolt or screw and thread onto the shank. When tightened, they create a secure connection between two or more objects.
What is DIN 934?
DIN 934 is a standard for hex nuts that is used in Europe and many other parts of the world. DIN stands for Deutsches Institut für Normung, which is the German Institute for Standardization. The DIN 934 standard specifies the dimensions, materials, and other requirements for hex nuts. The standard covers a wide range of sizes, from M1.6 to M64.
What is A194 2H?
A194 2H is a specification for heavy hex nuts that are used in high-pressure and high-temperature applications. The A194 2H specification is used in the United States, and it specifies the material, hardness, and other requirements for heavy hex nuts. A194 2H nuts are made from alloy steel and are heat-treated to achieve a minimum hardness of 320 Brinell. They are commonly used in applications such as pressure vessels, piping systems, and power generation equipment.
What is Zinc Plating?
Zinc plating is a process in which a layer of zinc is applied to the surface of a metal object to provide protection against corrosion. Zinc plating is commonly used on fasteners such as nuts, bolts, and screws because it is a cost-effective way to protect them from rust and other types of corrosion. Zinc plating also provides a decorative finish that can enhance the appearance of the fastener.
What is a Metric Thread?
A metric thread is a type of thread that is used in metric fasteners. Metric threads are specified by their pitch, which is the distance between adjacent threads. Metric threads are used in many parts of the world, including Europe, Asia, and Australia. In the United States, imperial threads are more commonly used.
DIN 934 A194 2H Zinc Plated Hex Nut Metric Thread Fastener
The DIN 934 A194 2H Zinc Plated Hex Nut Metric Thread Fastener is a high-quality fastener that is designed to provide a secure connection between two or more objects. The nut is made from alloy steel and is heat-treated to achieve a minimum hardness of 320 Brinell, which makes it suitable for use in high-pressure and high-temperature applications. The nut is also zinc plated, which provides protection against corrosion and enhances its appearance.
The DIN 934 A194 2H Zinc Plated Hex Nut Metric Thread Fastener is available in a wide range of sizes, from M1.6 to M64. This makes it suitable for use in a variety of applications, from small electronic devices to large machinery. The metric thread ensures that the nut is compatible with other metric fasteners, which makes it easy to find compatible bolts and screws.
Stud Bolt Materials
The most common materials for stud bolts (for flanges) are ASTM A193 (grade B7, B8, B8M, B8T), ASTM A453 (grade 660), ASTM A320 (grade L7, L7M), and ASTM A182 (duplex and super duplex bolting). For aggressive fluids and environments, stud bolts can be coated with Xylan/PTFE, Zinc and other materials.
| Physical Element | ASTM A193 grade B7 (AISI 4140) | ASTM A193 grade B8 (AISI 304) | ASTM A193 grade B8M (AISI 316) |
|---|---|---|---|
| Carbon | 0.38 - 0.48% | 0.08% max | 0.08% max |
| Manganese | 0.75 - 1.00% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.040% | 0.030% | 0.030% |
| Silicon | 0.15 - 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.80 - 1.10% | 18.0 - 20.0% | 16.0 - 18.0% |
| Nickel | absent | 8.0 - 11.0% | 10.0 - 14.0% |
| Molybdenum | 0.15 - 0.25% | absent | 2.00 - 3.00% |
| ASTM A193 | Size | Min Tensile Strength (KSI) | Min Yield Strength (KSI) | Min Elongation (%) | RA % min | Max HBW | Max HRC |
|---|---|---|---|---|---|---|---|
| ASTM A193 grade B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 | 321 | 35 |
| 2-5/8 - 4 | 115 | 95 | 16 | 50 | |||
| 4-1/8 - 7 | 100 | 75 | 18 | 50 | |||
| ASTM A193 grade B8 Class 1 | All | 75 | 30 | 30 | 50 | 223 | 35 |
| ASTM A193 grade B8M Class 1 | All | 75 | 30 | 30 | 50 | 223 | 96 |
| ASTM A193 grade B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 | 321 | 35 |
| 7/8 - 1 | 115 | 80 | 15 | 35 | |||
| 1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | |||
| 1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | |||
| ASTM A193 grade B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 | 321 | 35 |
| 7/8 - 1 | 100 | 80 | 20 | 45 | |||
| 1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | |||
| 1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 |
The material chosen for the threaded stud and the hex nuts should be compatible. Materials for bolting sets shall be selected based on the process's working temperatures, as shown in the table below:
| TEMPERATURE °C ( °F ) | ||
| STUD BOLTS MATERIALS | MIN. | MAX. |
| CARBON STEEL | -29 (-20) | 300 (572) |
| A193 B7, L7 | -73 (-100) | 400 (752) |
| A193 B6 | 0 (32) | 500 (932) |
| A193 B8 | -200 (-325) | 575 (1067) |
| A193 B16 | 0 (32) | 520 (968) |
| A193 B17B | -29 (-20) | 650 (1202) |
| A913 Inconel 718 | 0 (32) | 750 (1382) |
| A453 Gr. 660 | -29 (20) | 538 (1000) |
Stud bolts can be coated to increase the resistance to corrosion. The most common types of coatings for stud bolts are listed below:
