General Design Principles for DuPont Engineering Polymers - Module

Table 10.01
Self-Threading Screw Performance in Zytel ®
69
Type A Screw No.
6 7 8 9 10 14
Screw
Ds mm 3.6 4 4.3 4.9 5.6 6.5
in 0.141 0.158 0.168 0.194 0.221 0.254
ds mm 2.6 2.9 3.1 3.4 4.1 4.7
Hub
in 0.096 0.108 0.116 0.126 0.155 0.178
Dh mm 8.9 10 10.8 12.2 14 16.2
in 0.348 0.394 0.425 0.480 0.550 0.640
dh mm 2.9 3.3 3.5 4.1 4.7 5.5
Pull-out Load*
in 0.114 0.130 0.138 0.162 0.185 0.217
Zytel ® 101 kg 225 325 385 430 510 640
lb 495 715 848 947 1123 1409
Zytel ® 70G 33 L kg 230 320 350 390 485 620
Stripping Torque*
lb 506 704 770 859 1068 1365
Zytel ® 101 cm kg 16 25 36 50 70 100
ft Ib 1.2 1.8 2.6 3.6 5.1 7.2
Zytel ® 70G 33 L cm kg 25 35 48 63 80 100
ft lb 1.8 2.5 3.5 4.6 5.8 7.2
*Based on parts conditioned to equilibrium at 50% RH
D s
d s
D h
Table 10.02
Self-Threading Screw Performance in Delrin ®
Screw No. 6 7 8 10 12 14
mm
Ds in
3.6
0.141
4
0.158
4.3
0.168
4.9
0.194
5.6
0.221
6.5
0.254
mm
ds in
2.6
0.096
2.9
0.108
3.1
0.116
3.4
0.126
4.1
0.155
4.7
0.173
mm
Dh in
8.9
0.348
10
0.394
10.8
0.425
12.2
0.480
14
0.550
16.2
0.640
-
mm
dh in
2.9
0.114
3.3
0.130
3.5
0.138
4.1
0.162
4.7
0.185
5.5
0.217
Delrin ® 500 NC-10 N 3100 3800 4500 5250 6500 9000
lb 682 838 991 1156 1431 1982
Delrin ® 570 N 3050 3600 4250 4950 6000 8300
lb 671 792 936 1090 1321 1828
Delrin ® 500 NC-10 J 2.5 3.5 4.6 5.8 7.5 11.2
ft Ib 1.8 2.5 3.3 4.2 5.4 8.1
Delrin ® dh 570 J 2.5 3.5 4.7 6.2 8.2 12.0
ft Ib 1.8 2.5 3.4 4.5 5.9 8.7