Sidee loo kala soocaa lowska rivet-ka ee yar-yar ee looska ka soo horjeeda?

lawska rivet oo leh xagal 90 ° waa madax weyn oo countersunk ah, halka lowska leh xagal 120 ° uu yahay madax yar oo countersunk ah.

Farqiga u dhexeeya labada:
1.Xagalka madaxu waa kala duwan yahay.
2. Dhexroorka sare ee madaxu wuu ka duwan yahay.