Trilobular thread rolling screw with extra wide spacing between 48。 profile threads, twin lead threads with a 1-2 thread point taper.
Applications/Advantages:
Thermoplastics engineering resing and certain thermosets. Sharper thread profile increases holding strength while reducing material displacement. Drive and strip torques are higher, reducing the need for inserts or reinforcing clips.
Self-Tapping Screw
Thread Rolling
| |
THREAD ROLLING
SCREWS |
| Nominal Screw Size and Threads Per inch |
c |
D |
Minimum Out-of-Round |
Recommended Pilot
Hole Sizes |
| Diameter of Circumscribing Circle |
Measurements Across Center |
| Max |
Min |
Max |
Min |
Soft Ductils Materials |
Brittle Materials |
| 4-20 |
.127 |
.120 |
.123 |
.117 |
.002 |
.100 |
.106 |
| 6-19 |
.147 |
.141 |
.143 |
.137 |
.003 |
.122 |
.128 |
| 8-16 |
.185 |
.179 |
.179 |
.173 |
.004 |
.149 |
.158 |
| 10-14 |
.212 |
.206 |
.208 |
.202 |
.004 |
.175 |
.185 |
| 1/4-10 |
.276 |
.270 |
.268 |
.262 |
.006 |
.224 |
.240 |
| Tolerance on Length |
Thru 3/4" : ±.030" |
Over 3/4" : ±.050" |
| Description |
Trilobular thread-rolling screw
with extra wide spacing between 48° profile threads : twin lead threads
with a 1-2 thread point taper. |
| Applications
/Advantages |
Thermoplastics engineering resins
and certain thermosets . Sharper thread profile increases holding strength
while reducing material displacement. Drive and strip torques are higher,
reducing the need for inserts or reinforcing clips. |
| Material |
AISI 1022 steel |
| Heat Treatment |
Screws shall be quenched in
liquid and then tempered by reheating to 850°F minimum. |
| Case Hardness |
Rockwell C45 minimum. |
| Case Depth |
No.4 & 6 diameters : .002 -
.007 / No.8 & 10 diameters : .004 - .009
/ No.14 diameters : .005 - .011 |
| Core Hardness (after tempering) |
Rockwell C28-38 |
|
Trilboular thread rolling screw. As each lobe of the screw moves through the pilot hole in the nut material, it forms and work-hardens the nut thread metal, producing an uninterrupted grain flow.
Applications/Advantages:
For drilled, punched or cored holes in all ductlle metals and punch extruded metals. Eliminates chips, requires low drive torque and provides excellent resistance to vibrational loosening.
Thread Rolling Self-Tapping Screws
THREAD ROLLING SCREWS |
| Nominal Screw Length |
C |
D |
G |
| Screw Body Dimensions |
Point |
| Diameter of
Circumscribing Circle |
Measurement Acrose
Center |
Diameter of Circumscribing Circle |
| Max |
Min |
Max |
Min |
Max |
| 4-40 |
|
.1105 |
.1095 |
.1055 |
.090 |
| 6-32 |
.1410 |
.1350 |
.1350 |
.1290 |
.111 |
| 8-32 |
.1670 |
.1610 |
.1610 |
.1550 |
.137 |
| 10-24 |
.1940 |
.1880 |
.1860 |
.1800 |
.153 |
| 10-32 |
.1930 |
.1870 |
.1870 |
.1810 |
.163 |
| 1/4-20 |
.2550 |
.2490 |
.2450 |
.2390 |
.206 |
| 5/16-18 |
.3180 |
.3120 |
.307 |
.301 |
.264 |
| 3/8-16 |
.3810 |
.3750 |
.3685 |
.3625 |
.320 |
| Nominal Screw Length |
| Tolerance on Length |
Nominal Screw Size |
To 1/2" to 1" Incl. |
Over 1/2" to 1" Incl. |
Over 1" to 2" Incl. |
Over 2" |
| #4 - #10 |
+0. - .030 |
+0. - .030 |
+0. - .060 |
+0. - .090 |
| 1/4" - 3/8" |
+0. - .030 |
+0. - .030 |
+0. - .060 |
+0. - .090 |
| Description |
Trilobular thread-rolling screw
.As each lobs of the screw moves through the pilot hole in the nut
material . it forms and work ,hardens the nut thread metal , producing an
uninterrupted grain flow. |
| Applications /
Advantages |
For drilled , punched or corred
holes in all ductlle metals and punch extruded metals .Eliminates chips ,
requires low drive torque and provides excellent resistance to
vibrational loosening. |
| Material |
AISI 1022 steel |
| Heat Treatment |
Screws shall be quenched in
liquid and then tempered by reheating to 650°F minimum. |
| Case Hardness |
Rockwell C45 minimum. |
| Case Depth |
4-40 & 6-32 diameters : .002 -
.007 / 8-32 , 10-24 & 10-32 diameters :
.004 - .009
1/4-20 diameters & larger :. .005 - .011 |
| Core Hardness
(after tempering) |
Rockwell C28-38 |
|
DIN7500 : Thread rolling screw for ISO metric screw
Dimensions and designation
Table 1 : Screw types and designations
The section of the screw enclosed within chain thin double dashed lines shall
be designed at the manufacturer's discretion(see 4.3)
| Type |
llustration |
Other dimensions as in |
Range of sizes suitable for rolling |
Example of designation |
| AE |
|
DIN EN ISO 1207 |
M3.5 to M10 |
Screw DIN 7500-AE M6 x 20-St |
| BE |
|
DIN EN ISO 1580 |
M2 to M 6 |
Screw DIN 7500-AE M6 x 20-St |
| CE |
|
DIN EN ISO 7045 |
M2 to M10 |
Screw DIN 7500-CE M6 x 20-St-Z1
|
| DE |
|
DIN EN ISO 24017 |
M2 to M10 |
Screw DIN 7500-DE M6 x 20-St |
| E |
|
DIN 912 |
M2 to M10 |
Screw DIN 7500-E M6 x 20-St |
| KE |
|
DIN EN ISO 2009 |
M2 to M10 |
Screw DIN 7500-KE M6 x 20-St |
| 1) IF previous designations do not include the
symbol H or Z ( to identify the cross recess ). recess type H shall apply. |
Type |
llustration |
Other dimensions as in |
Range of sizes suitable for rolling |
Example of designation |
LE |
|
DIN EN ISO 2010 |
M2 to M10 |
Screw DIN 7500-LE M6 x 20-St |
ME |
|
DIN EN ISO 7046-2 |
M2 to M10 |
Screw DIN 7500-ME M6 x 20-St-Z1 |
NE |
|
DIN EN ISO 7047 |
M2 to M10 |
Screw DIN 7500-CE M6 x 20-St-Z1 |
| |
The DIN 4000-2-1 tabular layout of article characterisitics shall apply to
screw as coverd in this standard.
|
