Thread Rolling Screw (Trilobular)

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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 M6 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