Square Tube

CURVED STEEL

Your Bending Experts

Round Tube

WHY USE CURVED STEEL?

Reduce Risk & Control Cost

Hardway Beam

USE CURVED STEEL

It's Recyclable & Looks Great

Heat Exchangers

FAMILY OWNED & OPERATED

Since 1939

Bending Beams

YOUR TRUSTED ADVISERS

We Value Our Relationships

Square Beams

AWARD-WINNING PROJECTS

AESS Bending

Large Round Tubes

INNOVATION LEADER

Facilites, Equipment, R & D

Plate Rolling

STEEL BENDING

Accurate & Repeatable Parts

Specialty Coils

SPECIALTY BENDING

Difficult & Unusual Parts

I-Beams

MATERIAL SIZES

Big & Small

Curved Beams

CUSTOMER SERVICE

We Communicate

Bent Beams

HIGHEST QUALITY

Lowest Distortion

Pipe Spools

VALUE ADDED SERVICES

Custom Fabrication!

HOME > CALCULATORS > BENDING TOLERANCES

BENDING TOLERANCES


Rotary Draw, Roll and Increment Bending Tolerances

Standard shop tolerances for rotary draw, roll and increment bending procedures are available upon request.



Spiral Bending Tolerances



Tolerances for Cold Spiral Bending
Plain view radius of 12'0" or less.

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10 ft +/- 1⁄2" Within 3° overall +/- 1° +/- 1⁄2" +/- 1⁄4"
10 ft - 17 ft +/- 3⁄4" Within 3 1⁄2° overall +/- 1° +/- 1" +/- 1⁄2"
17 ft - 24 ft +/- 1" Within 4° overall +/- 1 1⁄2° +/- 1 1⁄2" +/- 1"
Over 24 ft +/- 1" Within 5° overall +/- 1 1⁄2° +/- 2" +/- 1"
*To properly QC, all stringers are stood up at full scale pitch.


Tolerances for Cold Spiral Bending
Plain view radius greater than 12'0"

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10ft See Note 1 Within 3° overall +/- 1° n/a n/a
10 ft - 17 ft See Note 1 Within 3 1⁄2° overall +/- 1° n/a n/a
17 ft - 24 ft See Note 1 Within 4° overall +/- 1 1⁄2° n/a n/a
Over 24 ft See Note 1 Within 5° overall +/- 1 1⁄2° n/a n/a
*To properly QC, all stringers are stood up at full scale pitch.

Notes:
  1. Plumb to Radius line tolerance is Not Applicable. Instead, Albina will apply our standard shop cord and rise tolerances (available upon request).
  2. The level to vertical face is a cumulative tolerance. You cannot be more than half the allowed tolerance out at any one point.
    For example: If your tolerance is 11/2° for the vertical face, you can be 3/4° out at the bottom, 0° out at midpoint, and 3/4° out at the top. This would be 11/2° out total. You would not be allowed to be more than 3/4° out at any given point since that would be more than half your tolerance in one spot.


Tolerances for Hot Spiral Bending
Plain view radius of 20'0" or less.

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10ft +/- 1⁄4" Within 1 1⁄2° overall +/- 1⁄2° +/- 1⁄2" +/- 1⁄4"
10 ft - 17 ft +/- 1⁄2" Within 2° overall +/- 3⁄4° +/- 3⁄4" +/- 3⁄8"
17 ft - 24 ft +/- 3⁄4" Within 2 1⁄2° overall +/- 1° +/- 1" +/- 3⁄4"
Over 24 ft +/- 1" Within 3° overall +/- 1 1⁄2° +/- 1 1⁄2" +/- 1"
*To properly QC, all stringers are stood up at full scale pitch.


Tolerances for Hot Spiral Bending
Plain view radius greater than 20'0"

True Arc Length Plumb to Radius Line Torpedo Level Vertical Face Pitch in Degrees Height at Midpoint Height at Top
Under 10 ft See note 1 Within 1 1⁄2° overall +/- 1⁄2° +/- 1⁄2" +/- 1⁄4"
10 ft - 17 ft See note 1 Within 2° overall +/- 3⁄4° +/- 3⁄ 4" +/- 3⁄8"
17 ft - 24 ft See note 1 Within 2 1⁄2° overall +/- 1° +/- 1" +/- 3⁄4"
Over 24 ft See note 1 Within 3° overall +/- 1 1⁄2° +/- 1 1⁄2" +/- 1"
*To properly QC, all stringers are stood up at full scale pitch.

Notes:
  1. Plumb to Radius line tolerance is Not Applicable. Instead, Albina will apply our standard shop cord and rise tolerances (available upon request).
  2. The level to vertical face is a cumulative tolerance. You cannot be more than half the allowed tolerance out at any one point.
    For example: If your tolerance is 11/2° for the vertical face, you can be 3/4° out at the bottom, 0° out at midpoint, and 3/4° out at the top. This would be 11/2° out total. You would not be allowed to be more than 3/4° out at any given point since that would be more than half your tolerance in one spot.


Your Steel Bending Experts

People Like Us!

These rolled plates you processed for us had to be welded together for an exposed circular guardrail. We assembled the plates, ends lined-up, radiuses matched – the parts fit perfectly. Thank you and your team for your accuracy and performance.


Joshua H.

Come Inside


Curved steel members don't just "come that way" from the mill. Curved steel members are produced from straight lengths of material and are bent per your specifications.

Albina Co., Inc. produces the highest quality curved steel products in the steel industry and provides the most reliable and professional customer service experience.

Latest Posts

Useful Links

Contact Us

12080 SW Myslony St
Tualatin, OR 97062
Phone: (503) 692-6010
Fax: (503) 692-6020
Toll Free: 866-ALBINA8 (252-4628)
Email: info@albinaco.com

2020 © All Rights Reserved. Privacy Policy