What Are Threaded Rods

Threaded Rods are used in construction and maintenance where the length or diameter needed is too big for a standard bolt or screw. They can also be used in high tension and vibration applications.

There are many different types of threaded rods available. These include stainless steel threaded rods, which are highly corrosion resistant.

ASTM A325
Threaded rods are manufactured to meet specific strength requirements and come in various shapes and sizes. They are commonly used in heavy machinery to help transfer power and heavy torque. They also offer superior load capabilities, tolerances, and wear properties.

These threaded rods and studs are available in metric, standard, and high-strength materials. They are suited for industrial, commercial, and residential applications that require reliable fastening.

ASTM A325 threaded rods are a type of structural bolt and are typically recommended for heavy construction projects. These bolts are also used in OEM (original equipment manufacturer) applications.

These bolts have a minimum tensile strength of 120 ksi (830 MPa). They are made from medium carbon, alloy steel that is quenched and tempered to reach the required strength properties. Common finishes are plain black, zinc plated, and hot-dip galvanized. One end of each rod must have a permanent grade symbol and manufacturer’s identifier stamp.

ASTM A449
Threaded Rods are used in a wide range of applications. They are a popular choice because they are affordable and sturdy. They are also available in a variety of finishes and sizes.

ASTM A449 is a specification that covers quenched and tempered steel hex cap screws, bolts, headed bolts, rods, and anchor bolts in diameters ranging from 1/4" through 3". The fasteners are intended for general engineering use with a high strength requirement.

A449 is virtually identical in chemistry and strength to ASTM A325 in diameters 1/2'' through 1''; however, A449 is more flexible considering it does not require a forged head or a specific configuration.

These rods are manufactured from AISI 316 stainless steel and are designed for low-temperature applications. They are used in flanges, valves, pressure vessels, and fittings. They are available in plain black, hot-dip galvanized, and zinc plated finishes.

ASTM J429
Threaded rods are a type of fastener used in a variety of industries. They are available in a variety of materials, including carbon steel, stainless steel and alloy steel.

In general, the higher the bolt grade, the stronger it is. Bolt grades can be determined by using the SAE, ISO or ASTM standards.

This standard covers quenched and tempered alloy steel hex cap screws, threaded rods, headed bolts and studs in diameters ranging from 1/4" to 3 inches inclusive. The specification does not have configuration limitations, so it's suitable for a wide range of applications.

The ASTM J429 specification is virtually identical to ASTM A325 and SAE J429 grade 5 in terms of chemistry and strength, but it is more flexible due to being non-restricted to specific configurations. If you have an engineer of record specifying ASTM A325 all thread rod, it may be a good idea to suggest changing to an ASTM A449 grade instead for diameters 1'' and less.

ASTM B7
Threaded Rods are a common type of fastener. They are typically long studs that are fully threaded and often used in tension applications. These fasteners are typically made of a chromium-molybdenum alloy steel that has been heat treated to increase strength properties and develop the desired mechanical properties.

A193 Grade B7 bolts and threaded studs are manufactured from a chromium-molybdenum-vanadium alloy steel that has been quenched and tempered to develop the mechanical properties (strength). This alloy allows for higher temperature flanged connections than the other grades in the A193 specification without losing their molecular structure or strength.

These fasteners are commonly used in pressurized piping systems that experience elevated ambient temperatures such as boilers, turbines and petrochemical plants. They can also be used in corrosive environments and may require coating to protect against corrosion. These fasteners are available in a plain, bare metal finish but are usually hot-dip galvanized, zinc plated, Xylan coated, or PTFE coated for corrosion resistance.