Beth yw'r ystodau uchder nodweddiadol ar gyfer dur sianel UPE / UPN?

UPE and UPN channels have standard height ranges (measured from web top to bottom) from 50 mm (UPE 50/UPN 50) to 400 mm (UPE 400/UPN 400). Common sizes include UPE 100 (100 mm height), UPN 120 (120 mm height), UPE 200 (200 mm height), and UPN 300 (300 mm height). EN 10279 specifies height tolerances: ±1.0 mm for heights ≤100 mm, ±1.5 mm for 101–200 mm, and ±2.0 mm for >200 mm. Mae'r goddefiannau hyn yn sicrhau cydnawsedd â chydrannau parod (ee, bolltau, cromfachau) a pherfformiad strwythurol cyson. Er enghraifft, rhaid i sianel UPE 200 gynnal ei huchder 200 mm i ffitio i mewn i fraced trawst a gynlluniwyd ar gyfer y maint hwnnw, gan osgoi oedi gosod.