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This product is regulated by the following standards:

UNI 7346 BS 4174 22

Technical data

Standard UNI 7346

Hammer drive screws with round head

Dimensions in mm - source UNI 7346 - WITHDRAWN 

Publication date: 11/1974
d nominal thread size D min/max h min/max d1 min/max
s
hole Ø hard materials hole Ø soft materials
1.5 2.28÷2.5 0.66÷0.87 1.18÷1.24  1.19 1.32 1.31
1.9 3÷3.22 1.05÷1.24 1.52÷1.6  1.19 1.75 1.7
2.5  3.7÷4.1 1.5÷1.75  2.03÷2.1  1.19 2.2 2.1
2.9 4.9÷5.35 1.9÷2.18 2.34÷2.43  1.19 2.7 2.6
3.5 6.06÷6.6 2.3÷2.6  2.84÷2.94  1.59 3.1 3
4.2  7.24÷7.84 2.7÷ 3.05  3.35÷3.45  1.98 3.7 3.6
4.5 8.49÷ 9.1 3.12÷3.47  3.71÷3.8 1.98 4.2 4
5.3 9.7÷10.35 3.53÷3.88 4.39÷4.5  3.18  4.9 4.7
6.1  10.9÷11.6 3.93÷4.3 5.02÷5.13 3.18  5.7  5.4

Dimensions in Inches - source BS 4174 type U

Publication date: 1972
d nominal thread size Nr. of thread d min/max D min/max h min/max d1 min/max
s nom
drill Ø hole Ø
No.00 6 0.057÷0.06 0.09÷0.099 0.026÷0.034  0.046÷0.049 0.02 55  0.052
No.0 6 0.072÷0.075 0.116÷0.127  0.041÷0.049  0.06÷0.063  0.035  51  0.067
No.2 8 0.097÷0.1 0.146÷0.162  0.059÷0.069  0.08÷0.083  0.045  44  0.086
No.4 7 0.112÷0.116 0.193÷0.211  0.075÷0.086  0.092÷0.096  0.062  37  0.104
No.6 7 0.136÷0.14 0.24÷0.26  0.091÷0.103  0.112÷0.116  0.078  31  0.12
No.7 8 0.15÷0.154 0.264÷0.285  0.099÷0.111  0.122÷0.126 0.096  29  0.136
No.8 8 0.162÷0.167 0.287÷0.309  0.107÷0.12  0.132÷0.136 0.125  27  0.144
No.10 8 0.177÷0.182 0.334÷0.359  0.123÷0.137  0.146÷0.15  0.125  20  0.161
No.12 8 0.206÷0.212 0.382÷0.408  0.139÷0.153  0.173÷0.177 0.142  11  0.191

UNI 7346 -  Approx.  weights, in kg x1000 pcs, (ρ=7,85 kg/dm3) - commercial lengths

d thread size 1.5 1.9 2.5 2.9 3.5 4.2 4.5 5.3 6.1
nominal length l                  
3.5 0.03 0.1 0.18            
5 0.07 0.12 0.21 0.4          
6.5 0.09 0.13 0.25 0.44 0.73        
8   0.16 0.3 0.49 0.79 1.08 1.66    
9.5     0.33 0.53 0.88 1.29 1.97    
13       0.68 1.08 1.76 2.65 2.7 3.44
16           2.17 3.3 3.35 4.24
19               3.95 5.03

Standard BS 4174 22

Hammer drive screws with round head

 

Dimensions in mm - source BS 4174

Publication date 05/1972
size d max d min d2 max d2 min d1 max d1 min k max k min
00 1.52 1.45 1.24 1.17 2.51 2.29 0.86 0.66
0 1.90 1.83 1.60 1.52 3.22 3.00 1.24 1.04
2 2.54 2.46 2.11 2.03 4.11 3.71 1.75 1.50
4 2.95 2.84 2.44 2.34 5.36 4.90 2.18 1.90
6 3.56 3.45 2.95 2.84 6.60 6.10 2.62 2.31
7 3.91 3.81 3.20 3.10 7.24 6.70 2.82 2.51
8 4.24 4.11 3.45 3.85 7.85 7.29 3.05 2.72
10 4.62 4.50 3.81 3.71 9.12 8.48 3.48 3.12
12 5.38 5.23 4.50 4.39 10.36 9.70 3.89

3.53

L<3.2, S = 0,5 mm , 3.2 ≤L<4, S=0.9mm , 4.5≤L<8,S=1.2 mm ; 9.l5≤L<13;S=1.6 mm 16≤l<22,S=2 mm L>25 , S=3,2 mm .

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