Angle Bending: Standard Angle Rings and Blowpipe Rings

angle iron bending

Typical uses for rolled angle include Flange Rings, Lintels, Ladle Lips, Tank Supports, Pour Stops, Roofing Systems and Architectural Accents.

Standard Angle Rings and Blowpipe Rings

How to bend angle iron

Angle Iron can be rolled Leg In or Leg Out. For odd leg angles, one of the legs must be specified as Leg In or Leg Out.

For instance on a L6x4, the angle can actually be rolled 4 different ways- 6” Leg In or Leg Out or the 4” Leg in or Leg Out.

Angles can also be rolled Heel In and Heel Out.

Angle ring flange

One of the most common applications of angle bending is to form complete rings which are called rolled angle rings, angle flanges, or companion angle rings.

When Roll Formed Metal Angles are bent inline into rings in our Angle forming process, they are called Flanges when they are bent inline with the leg out.

Application of Angle Ring flange

Angle Ring flanges adapt pipe and fittings for bolt together assembly and for attachment to walls and cabinets. Ideal for Dust Collection, Fume Venting, and HVAC systems.

Standard angle rings and blowpipe rings

Over the decades, two types of angle rings were developed as stock items: standard angle rings and blowpipe rings.


The two types of rings differ in their inside diameter, the angle size used, the bolt circles, the number of holes and hole sizes, and the weight of a ring.

For example, a 16in standard angle ring has an inside diameter of 16-1/4in, is made of 1-3/4 x 1-3/4 x 3/16 angle with a 18-1/8 bolt circle for 16 ea. 13/32 holes, and weighs 9.50lbs. A 16in blowpipe angle ring has an inside diameter of 16-1/8in, is made of 1-1/2 x 1-1/2 x 3/16 angle with an 18in bolt circle for 8 ea. 7/16 holes, and weighs 8lbs.

Standard angle ring

Standard angle rings tend to be a little heavier with a larger angle and more bolt holes. Standard angle rings are used in heavier applications, for example, in conveying grain.

Blowpipe ring

Blowpipe rings are used in lighter applications, for example, in conveying air, dust or other light particulate. Both types of rings work well in pneumatic conveying systems. They are welded to the outside of the pipe and therefore cause no interference to the flow inside the pipe.

PHOTOS of Angle bending machine