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Interior finishing screws selection
Drill Point / Drilling Capacity
Top Material to be Drilledd Bottom Material to be Drilledd
Top Material to be Drilled d
Void or Insulationn Bottom Material to be Drilledd
Hole Diameter r s
Larger than Screw Threads d
Top Material to be pre-Drilledn
Void or Insulationd Bottom Material to be Drilled
Total Thickness to to be be Drilled Drilled
Total Total Thickness Thickness to to be be Drilled Drilled
Total Thickness to to be be Drilled Drilled
Drilling capacity – material thickness recommendations ( steel to steel )
Thickness of material to be drilled ( in .)
0.500
0.400
0.300
# 2 Point # 3 Point # 4 Point
0.200 0.210 0.220
0.100 0.100
0.035
Screw Diameter
0.110
0.140
0.175
0.100 0.100 0.100 0.100
0.250 0.250
0.175 0.175
# 5 Point 0.500
# 6 , # 8 # 10 # 8 # 10 # 12 # 14 # 12 # 14 # 12
0.250
Note : Gray or black areas represent total tickness of all steel including any void spaces between layers .
Length Selection
Length of the screw ( L ) Depending on the screwhead , there are two different ways to measure the overall length of a screw .
For HWH / HHWH , SHWH , PPCH , PFTH , PTH and PPH screws , the overall length is measured from the bottom of the collar under the head to the point of the screw .
For PWH , PFH , PFHUC and PBH screws , the overall length is measured from the top of the head to the point of the screw .
Maximum Thickness Fastened ( MTF ) The maximum thickness fastened for all screws is the length of the threads reduced by the first three threads ( embedment in the base material ). See drawings above .
The maximum thickness fastened ( MTF ) describes the maximum thickness of the attachments to be secured to the base material .
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