Farqiga silsiladda 20A-1/20B-1

Silsiladaha 20A-1/20B-1 labaduba waa nooc silsilad duuban ah, waxayna inta badan ku kala duwan yihiin cabbirro yar. Kuwaas waxaa ka mid ah, dhererka magacaaban ee silsiladda 20A-1 waa 25.4 mm, dhexroorka usha waa 7.95 mm, ballaca gudahana waa 7.92 mm, ballaca dibaddana waa 15.88 mm; halka dhererka magacaaban ee silsiladda 20B-1 uu yahay 31.75 mm, dhexroorka ushana waa 10.16 mm, oo leh ballaca gudaha oo ah 9.40 mm iyo ballaca dibadda oo ah 19.05 mm. Sidaa darteed, marka aad dooranayso labadan silsiladood, waxaad u baahan tahay inaad doorato sida ay xaaladdu tahay. Haddii awoodda la gudbinayo ay yar tahay, xawaaruhu uu sarreeyo, booskuna uu cidhiidhi yahay, waxaad dooran kartaa silsiladda 20A-1; haddii awoodda la gudbinayo ay weyn tahay, xawaaruhu uu hooseeyo, booskuna uu ku filan yahay, waxaad dooran kartaa silsiladda 20B-1.