What does the product reference demonstrate?
RIDGID's thin-wall conduit bender ordering table explicitly describes its listed bends by inside radius. That is enough to show why a radius label must be preserved rather than silently read as centerline radius.
Data Center Estimating is independent and is not affiliated with RIDGID. This tool catalog is not a project bend requirement, a cable pulling calculation or a code minimum. Use the approved conduit product, bend and installation detail for the estimate.
Sources: RIDGID: RIDGID: official reference checked 22 October 2026
Which bend fields should the takeoff retain?
Keep the quantity and geometric basis together. A route length or trade-size label does not resolve which surface a radius describes.
| Field | Required basis | Estimate consequence |
|---|---|---|
| Bend item | Product and angle | Which fitting or work item? |
| Radius | Inside or centerline label | Comparable geometry? |
| Tube dimension | Actual outside diameter | Reference conversion possible? |
| Route | Approved bend location | Same interface envelope? |
| Supply scope | Factory bend or field work | What is included? |
| Approval | Current drawing reference | Who resolved the geometry? |
How large is a reference mismatch?
Illustrative example. Assume a fictional perfectly circular conduit bend has a 100 mm inside radius and a circular tube with 20 mm outside diameter. Its centerline radius is 110 mm and its outside surface radius is 120 mm. These are three references on the same simplified geometry.
A quoted 100 mm centerline radius would therefore describe a different bend. This exercise assumes concentric circles and ignores ovality and manufacturing effects. It does not convert trade size to actual diameter or establish any permitted minimum bend radius.
What should the estimator do with an unlabeled radius?
Request the product or approved detail that defines the reference, and retain a specific open input in the estimate. Separate an unresolved geometry question from a verified scope change; do not add an arbitrary fitting or rework allowance.
Cable bend limits, pulling constraints and electrical or structural approval remain with the responsible designers. Engineering sign-off is performed only by the registered engineer on the job.
Common questions
What else should the bid team know?
Does trade size supply the actual diameter for this example?
No. Use the selected product dimensions.
Does the example establish a code minimum?
No. It only explains radius references on fictional geometry.
Should an unlabeled bend be assumed compatible?
No. Ask for the approved geometric basis before comparison.