What does 2H mean on a nut?
The 2H hex nut bears a clear mark on the fastener face, indicating the grade (2H). The grade 2H designation signifies nut formation, including the method of heat treatment, quenching, and temperature range required for tempering.
What is the difference between 2H and DH nuts?
Grade-2H nuts are recommended for use with bolts in high-pressure and high-temperature applications. Grade-DH nuts are recommended for use with A-490, Type-1 structural bolts. Grade-DH3 nuts are for use with A-490, Type-3 structural bolts.
What is the difference between 2H and 2HM nuts?
Both 2H and 2HM nuts have the same chemical composition. Grade 2H nuts have a higher proof load requirement. While not showing all of the sizes, this is a representative sample. Nominal Size, in.
What is A194 Gr 8?
The grade 8 in the A194 Gr 8 Material indicates Stainless steel heavy hex nuts made from AISI 304 grade stainless steel. Since the ASTM A194 Gr. 8 Nut specification includes austenitic stainless steel, the mechanical properties of this grade are exceptional.
What grade is a 2h nut?
ASTM A194 Grade 2h Nuts are carbon based steel heavy hex nuts. The Sa194-2h Material is a common high strength nut. This specification ASTM A194 Grade 2h Washer is often used in combination with the following standards of fasteners – A193 Grade B7, A325, A490, F1554 Grade 105.
What are Grade 2 bolts used for?
A grade 2 bolt is distinguished through its complete lack of markings and will usually have a tensile strength of between 60,000 and 74,000 psi. These bolts are generally used for non-critical joints and applications.
What does A194 mean?
The ASTM A194 specification covers carbon, alloy, and stainless steel nuts intended for use in high-pressure and/or high-temperature service. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2. 2) shall be used.
What is grade DH nut?
Nuts for Structural Applications—Grade DH. These nuts are designed to secure ASTM A325 bolts in structural joints. Also known as heavy hex nuts, they are about 10% wider and taller than standard hex nuts. Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.
What is the difference between B7 and B7M bolts?
ASTM A193 Grade B7M studs are identical in chemistry to Grade B7, as they are quenched and tempered carbon steel to achieve a lower hardness. However, they have a lower tensile strength than B7 studs.
What is the difference between a hex nut and a heavy hex nut?
A heavy hex nut is thicker and heavier in weight. The part has a larger diameter across the flats. They also require larger sockets and wrenches when being installed. The load strength is far higher than the standard hex nut, meaning it can bear more weight easily.
What type of steel is Grade 8?
medium carbon alloy steel
Grade 8 (SAE J429) is a medium carbon alloy steel with one of the highest tensile strengths available. With a minimum tensile strength of 150 ksi and a minimum yield of 130 ksi, Grade 8 has a higher tensile and yield strength than other steel grades such as Grade 5 and B7.
