203x203 UC — Sizes, Dimensions & Properties

8 sizes in the 203x203 serial size group. All dimensions in mm, section properties in cm units.

Designation	Mass (kg/m)	h (mm)	b (mm)	tw (mm)	tf (mm)	A (cm2)	Ixx (cm4)	Iyy (cm4)	Zxx (cm3)	Sxx (cm3)	rxx (cm)	ryy (cm)
203x203x127	127.5	241.4	213.9	18.1	30.1	162	15,400	4,920	1,280	1,520	9.75	5.5
203x203x113	113.5	235	212.1	16.3	26.9	145	13,300	4,290	1,130	1,330	9.59	5.45
203x203x100	99.6	228.6	210.3	14.5	23.7	127	11,300	3,680	988	1,150	9.44	5.39
203x203x86	86.1	222.2	209.1	12.7	20.5	110	9,450	3,130	850	977	9.28	5.34
203x203x71	71	215.8	206.4	10	17.3	90.4	7,620	2,540	706	799	9.18	5.3
203x203x60	60	209.6	205.8	9.4	14.2	76.4	6,120	2,060	584	656	8.96	5.2
203x203x52	52	206.2	204.3	7.9	12.5	66.3	5,260	1,780	510	567	8.91	5.18
203x203x46	46.1	203.2	203.6	7.2	11	58.7	4,570	1,550	450	497	8.82	5.13

203x203x127 UC

Designation: 203x203x127
Serial Size: 203x203
Mass per Metre: 127.5 kg/m
Depth of Section (h): 241.4 mm
Width of Section (b): 213.9 mm
Web Thickness (tw): 18.1 mm
Flange Thickness (tf): 30.1 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 8.88
Local Buckling Ratio cf/tf: 3.55
Second Moment of Area Ixx: 15,400 cm4
Second Moment of Area Iyy: 4,920 cm4
Elastic Modulus Zxx: 1,280 cm3
Elastic Modulus Zyy: 460 cm3
Plastic Modulus Sxx: 1,520 cm3
Plastic Modulus Syy: 704 cm3
Radius of Gyration rxx: 9.75 cm
Radius of Gyration ryy: 5.5 cm
Cross-Sectional Area: 162 cm2
Buckling Parameter (u): 0.854
Torsional Index (x): 7.38
Warping Constant (Iw): 0.549 dm6
Torsional Constant (It): 427 cm4
Surface Area per Metre: 1.28 m2/m
Surface Area per Tonne: 10 m2/t

203x203x113 UC

Designation: 203x203x113
Serial Size: 203x203
Mass per Metre: 113.5 kg/m
Depth of Section (h): 235 mm
Width of Section (b): 212.1 mm
Web Thickness (tw): 16.3 mm
Flange Thickness (tf): 26.9 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 9.87
Local Buckling Ratio cf/tf: 3.94
Second Moment of Area Ixx: 13,300 cm4
Second Moment of Area Iyy: 4,290 cm4
Elastic Modulus Zxx: 1,130 cm3
Elastic Modulus Zyy: 404 cm3
Plastic Modulus Sxx: 1,330 cm3
Plastic Modulus Syy: 618 cm3
Radius of Gyration rxx: 9.59 cm
Radius of Gyration ryy: 5.45 cm
Cross-Sectional Area: 145 cm2
Buckling Parameter (u): 0.853
Torsional Index (x): 8.11
Warping Constant (Iw): 0.464 dm6
Torsional Constant (It): 305 cm4
Surface Area per Metre: 1.27 m2/m
Surface Area per Tonne: 11.2 m2/t

203x203x100 UC

Designation: 203x203x100
Serial Size: 203x203
Mass per Metre: 99.6 kg/m
Depth of Section (h): 228.6 mm
Width of Section (b): 210.3 mm
Web Thickness (tw): 14.5 mm
Flange Thickness (tf): 23.7 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 11.1
Local Buckling Ratio cf/tf: 4.44
Second Moment of Area Ixx: 11,300 cm4
Second Moment of Area Iyy: 3,680 cm4
Elastic Modulus Zxx: 988 cm3
Elastic Modulus Zyy: 350 cm3
Plastic Modulus Sxx: 1,150 cm3
Plastic Modulus Syy: 534 cm3
Radius of Gyration rxx: 9.44 cm
Radius of Gyration ryy: 5.39 cm
Cross-Sectional Area: 127 cm2
Buckling Parameter (u): 0.852
Torsional Index (x): 9.02
Warping Constant (Iw): 0.386 dm6
Torsional Constant (It): 210 cm4
Surface Area per Metre: 1.25 m2/m
Surface Area per Tonne: 12.6 m2/t

203x203x86 UC

Designation: 203x203x86
Serial Size: 203x203
Mass per Metre: 86.1 kg/m
Depth of Section (h): 222.2 mm
Width of Section (b): 209.1 mm
Web Thickness (tw): 12.7 mm
Flange Thickness (tf): 20.5 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 12.7
Local Buckling Ratio cf/tf: 5.1
Second Moment of Area Ixx: 9,450 cm4
Second Moment of Area Iyy: 3,130 cm4
Elastic Modulus Zxx: 850 cm3
Elastic Modulus Zyy: 299 cm3
Plastic Modulus Sxx: 977 cm3
Plastic Modulus Syy: 456 cm3
Radius of Gyration rxx: 9.28 cm
Radius of Gyration ryy: 5.34 cm
Cross-Sectional Area: 110 cm2
Buckling Parameter (u): 0.85
Torsional Index (x): 10.2
Warping Constant (Iw): 0.318 dm6
Torsional Constant (It): 137 cm4
Surface Area per Metre: 1.24 m2/m
Surface Area per Tonne: 14.4 m2/t

203x203x71 UC

Designation: 203x203x71
Serial Size: 203x203
Mass per Metre: 71 kg/m
Depth of Section (h): 215.8 mm
Width of Section (b): 206.4 mm
Web Thickness (tw): 10 mm
Flange Thickness (tf): 17.3 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 16.1
Local Buckling Ratio cf/tf: 5.97
Second Moment of Area Ixx: 7,620 cm4
Second Moment of Area Iyy: 2,540 cm4
Elastic Modulus Zxx: 706 cm3
Elastic Modulus Zyy: 246 cm3
Plastic Modulus Sxx: 799 cm3
Plastic Modulus Syy: 374 cm3
Radius of Gyration rxx: 9.18 cm
Radius of Gyration ryy: 5.3 cm
Cross-Sectional Area: 90.4 cm2
Buckling Parameter (u): 0.853
Torsional Index (x): 11.9
Warping Constant (Iw): 0.25 dm6
Torsional Constant (It): 80.2 cm4
Surface Area per Metre: 1.22 m2/m
Surface Area per Tonne: 17.2 m2/t

203x203x60 UC

Designation: 203x203x60
Serial Size: 203x203
Mass per Metre: 60 kg/m
Depth of Section (h): 209.6 mm
Width of Section (b): 205.8 mm
Web Thickness (tw): 9.4 mm
Flange Thickness (tf): 14.2 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 17.1
Local Buckling Ratio cf/tf: 7.25
Second Moment of Area Ixx: 6,120 cm4
Second Moment of Area Iyy: 2,060 cm4
Elastic Modulus Zxx: 584 cm3
Elastic Modulus Zyy: 201 cm3
Plastic Modulus Sxx: 656 cm3
Plastic Modulus Syy: 305 cm3
Radius of Gyration rxx: 8.96 cm
Radius of Gyration ryy: 5.2 cm
Cross-Sectional Area: 76.4 cm2
Buckling Parameter (u): 0.846
Torsional Index (x): 14.1
Warping Constant (Iw): 0.197 dm6
Torsional Constant (It): 47.2 cm4
Surface Area per Metre: 1.21 m2/m
Surface Area per Tonne: 20.2 m2/t

203x203x52 UC

Designation: 203x203x52
Serial Size: 203x203
Mass per Metre: 52 kg/m
Depth of Section (h): 206.2 mm
Width of Section (b): 204.3 mm
Web Thickness (tw): 7.9 mm
Flange Thickness (tf): 12.5 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 20.4
Local Buckling Ratio cf/tf: 8.17
Second Moment of Area Ixx: 5,260 cm4
Second Moment of Area Iyy: 1,780 cm4
Elastic Modulus Zxx: 510 cm3
Elastic Modulus Zyy: 174 cm3
Plastic Modulus Sxx: 567 cm3
Plastic Modulus Syy: 264 cm3
Radius of Gyration rxx: 8.91 cm
Radius of Gyration ryy: 5.18 cm
Cross-Sectional Area: 66.3 cm2
Buckling Parameter (u): 0.848
Torsional Index (x): 15.8
Warping Constant (Iw): 0.167 dm6
Torsional Constant (It): 31.8 cm4
Surface Area per Metre: 1.2 m2/m
Surface Area per Tonne: 23.1 m2/t

203x203x46 UC

Designation: 203x203x46
Serial Size: 203x203
Mass per Metre: 46.1 kg/m
Depth of Section (h): 203.2 mm
Width of Section (b): 203.6 mm
Web Thickness (tw): 7.2 mm
Flange Thickness (tf): 11 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 160.8 mm
Local Buckling Ratio d/tw: 22.3
Local Buckling Ratio cf/tf: 9.25
Second Moment of Area Ixx: 4,570 cm4
Second Moment of Area Iyy: 1,550 cm4
Elastic Modulus Zxx: 450 cm3
Elastic Modulus Zyy: 152 cm3
Plastic Modulus Sxx: 497 cm3
Plastic Modulus Syy: 231 cm3
Radius of Gyration rxx: 8.82 cm
Radius of Gyration ryy: 5.13 cm
Cross-Sectional Area: 58.7 cm2
Buckling Parameter (u): 0.847
Torsional Index (x): 17.7
Warping Constant (Iw): 0.143 dm6
Torsional Constant (It): 22.2 cm4
Surface Area per Metre: 1.19 m2/m
Surface Area per Tonne: 25.8 m2/t

203x203 UC — Overview

The 203x203 serial size group contains 8 sections, ranging from 46.1 kg/m to 127.5 kg/m. All sections in this group share the same nominal depth and width but differ in web and flange thickness, which affects the weight and structural capacity.

Section properties are sourced from the Tata Steel Blue Book / SCI P363. For structural design to BS EN 1993-1-1 (Eurocode 3), use these properties with the appropriate partial factors from the UK National Annex.

Need Components for This Section?

Structural Steel Components supplies stiffener plates, end plates, base plates, cleats, and fixings matched to standard UK sections.

Section properties from Tata Steel Blue Book / SCI P363 / BS 4-1:2005.