Thread Forming 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 Ductile
Materials

Brittle
Materials

· 0 - 40

.0665

.0635

.0635

.0605

.002

.0498

.0490

2 - 28

.092

.086

.089

.083

.002

.076

.080

3 - 24

.110

.104

.106

.100

.002

.088

.094

4 - 20

.127

.121

.123

.117

.002

.100

.106

· 5 - 20

.136

.132

.133

.129

.002

-

-

6 - 19

.147

.141

.143

.137

.003

.122

.128

7 - 18

.166

.160

.160

.154

.004

.134

.142

8 - 16

.185

.179

.179

.173

.004

.149

.158

9 - 15

.199

.193

.193

.187

.004

.162

.172

10 - 14

.212

.206

.208

.202

.004

.175

.185

12 - 11

.232

.226

.226

.220

.005

.195

.205

1/4 - 10

.276

.270

.268

.262

.006

.224

.240

5/16 - 9

.345

.335

.335

.325

.006

.286

.303

Thru 3/4": ±.030"

Over 3/4": ±.050"

Over 1/4"Diameter, All Lengths:  ±.050"

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

Steel

Stainless

AISI 1022 steel

18-8: 18-8 stainless steel
410: 410 austenitic stainless steel

Heat Treatment

Screws shall be quenched in liquid and then tempered by reheating to
650°F minimum.

410: Screws shall be annealed by heating to 1850°-1950°F, held at least
1/2 hr & rapid air- or oil-quenched; then reheated to 525°F min. for at
least 1 hr & air cooled to provide the required mechanical properties.

Case Hardness

Rockwell C45 minimum

-

Case Depth

No. 2 thru 6 diameters: .002 - .007
No. 8 thru 10 diameters: .004 - .009
1/4" diameter: .005 - .011

-

Core Hardness
(after tempering)

18-8: Rockwell B90 - C20
410: Rockwell C34 - 42

Material: 

High-strength alloy steel, and several different stainless steel alloys, among others.

RoHS

Wide variety of lengths

#4(2.8) up to 1/2"

100 tons

Applications:

Structural Steel; Metal Buliding;  Oil&Gas; Tower&Pole;  Wind Energy; Mechanical Machine; Automobile: Home Decorating

Product type:

Pozi Taptite Thread Rolling Screws

Type Stainless:

304 or 316

Minimum Ordering Quantity:

5000 pcs

Price:

0.35

Delivery Date Quantity:

5000 pcs

Estimated time:

3 days 

Type:

Taptite Thread Rolling Screws

Material: 

High-strength alloy steel, and several different stainless steel alloys, among others.

RoHS

Wide variety of lengths

#4(2.8) up to 1/2"

100 tons

Applications:

Structural Steel; Metal Buliding;  Oil&Gas; Tower&Pole;  Wind Energy; Mechanical Machine; Automobile: Home Decorating

Product type:

Pozi Taptite Thread Rolling Screws

Type Stainless:

304 or 316

Minimum Ordering Quantity:

5000 pcs

Price:

0.35

Delivery Date Quantity:

5000 pcs

Estimated time:

3 days 

Type:

Taptite Thread Rolling Screws

Material: 

High-strength alloy steel, and several different stainless steel alloys, among others.

RoHS

Wide variety of lengths

#4(2.8) up to 1/2"

100 tons

Applications:

Structural Steel; Metal Buliding;  Oil&Gas; Tower&Pole;  Wind Energy; Mechanical Machine; Automobile: Home Decorating

Product type:

Torx Taptite Thread Rolling Screws

Type Stainless:

304 or 316

Minimum Ordering Quantity:

5000 pcs

Price:

0.35

Delivery Date Quantity:

5000 pcs

Estimated time:

3 days 

Type:

Taptite Thread Rolling Screws

Material: 

high-strength alloy steel, and several different stainless steel alloys, among others.

RoHS

Wide variety of lengths

#4(2.8) up to 1/2"

100 tons

Applications:

Structural Steel; Metal Buliding;  Oil&Gas; Tower&Pole;  Wind Energy; Mechanical Machine; Automobile: Home Decorating

Product type:

Torx Taptite Thread Rolling Screws

Type Stainless:

304 or 316

Minimum Ordering Quantity:

5000 pcs

Price:

0.35

Delivery Date Quantity:

5000 pcs

Estimated time:

3 days 

Type:

Taptite Thread Rolling Screws