C10x25 — Dimensions, Weight & Section Properties
American Standard (C) channel per ASTM A6 / AISC Steel Construction Manual
C10x25 is an American Standard steel channel 10 inches (254 mm) deep with a 2.89 in (73.4 mm) flange, weighing 25 pounds per foot (37.2 kg/m) — that is what the "25" in the designation means. All values below are the standard AISC published section properties used in US structural design, with metric equivalents alongside. Channel flanges are tapered, so the flange thickness listed is the AISC average value.
Typical uses: stair stringers, trailer and equipment frames, rails, lintels, and bracing — anywhere a flat back against a wall or web is handy. For a quick stiffness check, see the deflection example below or open the beam calculator with your own span and load.
Dimensions
| Depth d | 10 in (254 mm) |
| Flange width bf | 2.89 in (73.4 mm) |
| Web thickness tw | 0.526 in (13.4 mm) |
| Avg. flange thickness tf | 0.436 in (11.1 mm) |
Weight & Cross-Section
| Weight per foot | 25 lb/ft (37.2 kg/m) |
| 20 ft bar | 500 lb |
| 40 ft bar | 1,000 lb |
| Area A | 7.34 in² (47.4 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 91.1 in⁴ (3,792 cm⁴) |
| Section modulus Sx | 18.2 in³ (298 cm³) |
| Radius of gyration rx | 3.52 in |
| Moment of inertia Iy | 3.34 in⁴ (139 cm⁴) |
| Section modulus Sy | 1.47 in³ (24 cm³) |
| Radius of gyration ry | 0.68 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| C10x20 | 10 × 2.74 | 20 | 78.9 | 15.8 | −20 % | −13 % |
| C10x25 (this page) | 10 × 2.89 | 25 | 91.1 | 18.2 | — | — |
| C10x30 | 10 × 3.03 | 30 | 103 | 20.7 | +20 % | +13 % |
Deflection example
A simply supported C10x25 spanning 16 ft with a 10 kip point load at midspan deflects 0.56 in (E = 29,000 ksi, Ix = 91.1 in⁴). The L/360 serviceability limit for this span is 0.53 in — the shape does NOT pass this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a C10x25 channel weigh?
C10x25 weighs 25 pounds per foot (37.2 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 500 lb and a 40 ft bar 1,000 lb.
What are the dimensions of a C10x25?
C10x25 is exactly 10 in (254 mm) deep with a 2.89 in (73.4 mm) wide flange. The web is 0.53 in thick; the tapered flanges average 0.44 in. Unlike W-shapes, C-channel depths are exact — a C10 is always 10.00 in deep.
What are the dimensions of a C10x25 in mm?
C10x25 is 254 mm deep with a 73.4 mm wide flange; the web is 13.4 mm and the flange 11.1 mm thick. In metric section properties: Ix = 3,792 cm⁴, Sx = 298 cm³.
How much does a C10x25 weigh in kg?
37.2 kg per meter. A 6 m bar weighs 223 kg and a 12 m bar 446 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a C10x25?
About the strong axis, Ix = 91.1 in⁴ (3,792 cm⁴) with section modulus Sx = 18.2 in³. About the weak axis, Iy = 3.34 in⁴ and Sy = 1.47 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
C10x25 or C10x30 — what does one size up change?
C10x30 is about 20% heavier (30 vs 25 lb/ft) but about 13% stiffer (Ix 103 vs 91.1 in⁴). Going one step up within the same depth group is usually the cheapest way to cut deflection.
Values are entered from the governing standard’s published tables and cross-checked programmatically against its mass and section formulas before publication. Spotted an error? Write to advertising@metalabout.net — verified corrections ship within days. About