Oct 29, 2014 · It is known that the required grade of washer to be used with an A325 or A490 structural bolt is an ASTM F436 hardened washer, however whether or not a washer is required to be used in a given application is often brought into question.

Choose from our selection of ASTM F959 type A490 washers, including washers, lock washers, and more. Same and Next Day Delivery.

Fasten structural screws and nuts securely without overtightening. When you see orange dye, you'll know you've applied the correct tension, so you don't accidentally strip threads. These washers distribute pressure under fasteners in columns, joists, and I-beams.

Fasten structural screws and nuts securely without overtightening. When you see orange dye, you'll know you've applied the correct tension, so you don't accidentally strip threads. These washers distribute pressure under fasteners in columns, joists, and I-beams.

Load indicating washers (LIW) are used to develop the correct tension when installing A325 or A490 structural bolts. Standard DTIs and Squirter™ DTIs are made to ASTM F959. Load indicating washers may be available for other bolt grades as well.

Mar 9, 2016 · Can A325 Load Indicating Washers be used with A490 structural bolts? Load indicating washers are used to indicate the achievement of a specified minimum bolt tension. The ASTM specification covering load indicating washers is F959 and has two different types; 325 (type 1 and type 3) and 490 (type 1 and type 3).

Direct Tension Indicator Washers. DTI Washers, provide the steel fabricator and erector the ability to assure bolted connections are tightened to required compressive strength. The raised ribs resist compression until the required pressure is reached and the …

Compressible-Washer-Type Direct Tension Indicators ASTM F959 covers the requirements for compressible washer type direct tension indicators in diameters ranging from 1/2” to 1-1/2” inclusive. DTIs are intended for installation under either a bolt head or a hardened washer.

Squirter® DTI Washers are hardened DTI (Direct Tension Indicator) washers that when the proper tension has been applied to the washer, a colored silicone material will squirt out giving you a visual indication that the proper tension has been achieved.

AFT Fasteners provides a helpful resource on A325 & A490 bolts including: dimensions, material, hardness, proof load, yield strength and tensile strength.