Product Descriptions: 

Threaded (Screw) Flange:
The threaded flange is similar to the slip-on flange, but the bore is threaded. Its chief merit is that it can be assembled without welding, explaining its use in low pressure services at ordinary atmospheric temperatures and in highly explosive areas where welding create a hazard.

Features Specifications: Threaded Flanges

Flange Direct provides ASME / ANSI Code and other International Code Industrial flanges for the Petrochemical, Process, & Waterworks industries. ANSI, API, AWWA pipe flanges in carbon, stainless, alloys and chrome steel. Weld Neck, Slip on, Blind, Threaded, socket weld, Lap Joint, Orifice Flanges in sizes 1/2" to 198".