Dimensions - Joists

Welcome to our Joist dimensions page! Here you'll find dimensions for all UK Joist steel sections described by the Steelwork Design Guide to BS5950-1:2000, Volume 1, Section Properties, Member Capacities, 7th Edition (also known as The Blue Book). Sort the table below according to any property and select a CAD file to download using the reference links in the left-most column.

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Section Reference Mass per Metre Depth of Section Width of Section Thickness Radius Depth between Fillets Ratios for Local Buckling Dimensions for Detailing Surface Area
        Web Flange Root Toe   Flange Web End Clearance Notch Per Metre Per Tonne
  kg/m D
mm
B
mm
t
mm
T
mm
r1
mm
r2
mm
d
mm
b/T d/t C
mm
N
mm
n
mm
m2 m2
254x203x82 82 254 203.2 10.2 19.9 19.6 9.7 166.6 5.11 16.3 7 104 44 1.21 14.8
254x114x37 37.2 254 114.3 7.6 12.8 12.4 6.1 199.3 4.46 26.2 6 60 28 0.899 24.2
203x152x52 52.3 203.2 152.4 8.9 16.5 15.5 7.6 133.2 4.62 15 6 78 36 0.932 17.8
152x127x37 37.3 152.4 127 10.4 13.2 13.5 6.6 94.3 4.81 9.07 7 66 30 0.737 19.8
127x114x29 29.3 127 114.3 10.2 11.5 9.9 4.8 79.5 4.97 7.79 7 60 24 0.646 22
127x114x27 26.9 127 114.3 7.4 11.4 9.9 5 79.5 5.01 10.7 6 60 24 0.65 24.2
127x76x16 16.5 127 76.2 5.6 9.6 9.4 4.6 86.5 3.97 15.4 5 42 22 0.512 31
114x114x27 27.1 114.3 114.3 9.5 10.7 14.2 3.2 60.8 5.34 6.4 7 60 28 0.618 22.8
102x102x23 23 101.6 101.6 9.5 10.3 11.1 3.2 55.2 4.93 5.81 7 54 24 0.549 23.9
102x44x7 7.5 101.6 44.5 4.3 6.1 6.9 3.3 74.6 3.65 17.3 4 28 14 0.35 46.6
89x89x19 19.5 88.9 88.9 9.5 9.9 11.1 3.2 44.2 4.49 4.65 7 46 24 0.476 24.4
76x76x15 15 76.2 80 8.9 8.4 9.4 4.6 38.1 4.76 4.28 6 42 20 0.419 27.9
76x76x13 12.8 76.2 76.2 5.1 8.4 9.4 4.6 38.1 4.54 7.47 5 42 20 0.411 32.1