กกDry Wall Screws Type S Phillips Recessed Bugle Head Twinfast
mm
Thread size Threads/in. dk Cross recess L(in)
No. m
6 18 8.4 2 4.9 1-21/2
7 16 8.4 2 4.9 1-21/2
8 15 8.5 2 4.9 2-31/2
 
  กกChipboard Screws Countersunk Head Hardened

DIN 7505   

mm
Thread size 3 3.5 4 4.5 5 6
dk 6 7 8 9 10 12
m 3 4 4.4 4.8 5.3 6.6
Cross recess No. 1 2 2 2 2 3
L 10-40 13-50 13-60 15-70 17-80 40-80
 

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