BS 3293 Class 300 SO

The Slip-on flange has a low hub because the pipe slips into the flange prior to welding. It is welded both inside and out to provide suffcient strength and prevent leakage. 
Slip-on flanges are all bored slightly larger than the O.D. of the pipe. They are preferred over welding neck flanges bu many users due to their lower intial cost, but final intallation cost is probably not much less than that of the welding neck flange because of the additional welding involved.
Nominal
pipe size		Outside
diameter of
flange, O		Outside
diameter,
R		Thickness of
flange min., C		　Outside
diameter of
large end of hub, X		Outside diameter
of small end of
hub, A		Length through hub, YFillet radiusFlange bore, BDiameter of
bolt circle, D		Diameter of
bolt holes		Number of
bolt holes		Approxi-mate Weight kgs
26971.55749.3079.381.60720.73687.39184.156.35666.75876.3044.4528247.29
281035.05800.1085.731.60774.70739.78196.856.35717.55939.8044.4528301.48
301092.20857.2592.081.60825.50792.16209.556.35768.35996.9547.6328348.61
321149.35914.4098.431.60881.06844.55222.257.94819.151054.1050.8028402.88
341206.50965.20101.601.60936.63896.94231.787.94869.951104.9050.8028455.53
361270.001022.35104.781.60990.60949.33241.307.94920.751168.4053.9832508.05
Note: 7 mm raised face regularly furnished on Classes 150 and 300 unless otherwise ordered.

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