F959 / F959M

Description

Description

F959 / F959M DTI Washers – MKM Fasteners

MKM Fasteners is a trusted manufacturer and supplier of ASTM F959 / F959M DTI Washers, designed to provide accurate tension control in structural bolting applications. These Direct Tension Indicators (DTIs) are essential components in high-strength bolted assemblies where proper tension, not torque, is the key to secure fastening.

Our DTI washers are made from high-quality Carbon Steel and Alloy Steel, available in strength grades 8.8 and 10.9, and comply with ASTM F959 specifications. They are manufactured in sizes ranging from M12 to M36, with surface finishes like Black and Mechanical Galvanized (MG) to ensure durability and corrosion resistance.

DTI washer F959 / F959M simple washer type load cells known as a Direct Tension Indicator or a Load Indicating Washer. Moreover Load cells that are manufactured with raised dimples that are used to indicate when the proper tension level has been achieved during tightening. Since tension is what we are after NOT TORQUE. Thus DTI’s are manufactured to the F959 specification.

What is a DTI Washer?
A DTI washer is a specially designed load cell washer with raised dimples. When the bolt is tightened, these dimples compress, indicating that the correct tension level has been achieved. This helps eliminate guesswork from bolt tightening and improves safety and performance in structural assemblies.

Key Features:

• Manufactured as per ASTM F959 / F959M standards

• Available in metric sizes M12 to M36

• Material: Carbon & Alloy Steel

• Surface Finish: Black & MG

• Suitable for high-strength bolted connections

• Accurately measures tension, not just torque

• Commonly used in bridges, buildings, and heavy steel structures

At MKM Fasteners, we focus on delivering precision-engineered fasteners that meet global standards and performance expectations. Our in-house manufacturing and stringent quality control ensure that every DTI washer provides consistent and reliable performance.

Choose MKM Fasteners for dependable F959 / F959M DTI Washers – Precision Tension, Proven Strength.