ASME B18.6.5M (T11):2000 Metric Countersunk Head Square Drive Tapping Screw uses metric dimensions, a countersunk head, and a square drive, making it suitable for applications requiring strong drive engagement, a flush surface, and tapping capability.
The square drive provides good tool retention during assembly, reducing slipping and improving torque stability. The countersunk head allows a lower installed profile, while the tapping thread forms its mating thread in sheet metal or plastic pilot holes.
This product is suitable for export equipment, metal panels, plastic parts, furniture hardware, and light structural components. Different materials, finishes, and point forms can be configured to meet corrosion resistance, assembly efficiency, and appearance requirements.

Dimensions unit: mm
|
Thread size d |
ST2.9 |
ST3.5 |
ST4.2 |
ST4.8 |
ST5.5 |
ST6.3 |
ST8 |
ST9.5 |
|
|
P |
Pitch |
1 |
1.3 |
1.4 |
1.6 |
1.8 |
1.8 |
2.1 |
2.1 |
|
ds |
Max. |
- |
- |
- |
- |
- |
- |
- |
- |
|
Min. |
- |
- |
- |
- |
- |
- |
- |
- |
|
|
dk |
Max. |
5.5 |
7.3 |
8.4 |
9.3 |
10.3 |
11.3 |
15.8 |
18.3 |
|
Min. |
5.2 |
6.9 |
8 |
8.9 |
9.9 |
10.9 |
15.4 |
17.8 |
|
|
k |
Max. |
1.7 |
2.3 |
2.6 |
2.8 |
3 |
3.1 |
4.6 |
5.2 |
|
L1 |
Max. |
- |
- |
- |
- |
- |
- |
- |
- |
|
Min. |
- |
- |
- |
- |
- |
- |
- |
- |
|
|
r |
Max. |
1.2 |
1.4 |
1.6 |
2 |
2.2 |
2.4 |
3.2 |
4 |
|
Min. |
0.6 |
0.7 |
0.8 |
1 |
1.1 |
1.2 |
1.6 |
2 |
|
|
s |
Reference value |
1.78 |
2.31 |
2.84 |
2.84 |
3.38 |
3.38 |
4.85 |
4.85 |
|
T |
Reference value |
1.68 |
2.44 |
2.92 |
3.23 |
4.01 |
4.01 |
4.93 |
4.93 |
|
b |
Min. |
17 |
21 |
25 |
29 |
33 |
38 |
38 |
38 |
|
Slot number |
0 |
1S |
2S |
2R |
3R |
3R |
4R |
4R |
|
|
t |
Max. |
0.97 |
1.4 |
1.61 |
1.91 |
2.42 |
2.42 |
2.54 |
2.54 |
|
Min. |
0.71 |
1.01 |
1.21 |
1.52 |
2.03 |
2.03 |
2.15 |
2.15 |
|
|
Thread and end type |
AB,B,BF,BT |
AB,B,BF,BT |
AB,B,BF,BT |
AB,B,BF,BT |
AB,B,BF,BT |
AB,B,BF,BT |
AB,B,BF,BT |
AB,B,BF,BT |
|
|
Thread size d |
M2.5 |
M3 |
M3.5 |
M4 |
M5 |
M6 |
M8 |
M10 |
|
|
P |
Pitch |
0.45 |
0.5 |
0.6 |
0.7 |
0.8 |
1 |
1.25 |
1.5 |
|
ds |
Max. |
2.5 |
3 |
3.5 |
4 |
5 |
6 |
8 |
10 |
|
Min. |
2.36 |
2.86 |
3.32 |
3.82 |
4.82 |
5.82 |
7.78 |
9..78 |
|
|
dk |
Max. |
4.7 |
5.5 |
7.3 |
8.4 |
9.3 |
11.3 |
15.8 |
18.3 |
|
Min. |
4.4 |
5.2 |
6.9 |
8 |
8.9 |
10.9 |
15.4 |
17.8 |
|
|
k |
Max. |
1.5 |
1.7 |
2.3 |
2.7 |
2.7 |
3.3 |
4.6 |
5 |
|
L1 |
Max. |
0.55 |
0.6 |
0.7 |
0.8 |
9 |
1.1 |
1.4 |
1.7 |
|
Min. |
0.35 |
0.4 |
0.5 |
0.6 |
0.7 |
0.9 |
1.1 |
1.3 |
|
|
r |
Max. |
1 |
1.2 |
1.4 |
1.6 |
2 |
2.4 |
3.2 |
4 |
|
Min. |
0.5 |
0.6 |
0.7 |
0.8 |
1 |
1.2 |
1.6 |
2 |
|
|
s |
Reference value |
1.78 |
1.78 |
2.31 |
2.84 |
2.84 |
3.38 |
4.85 |
4.85 |
|
T |
Reference value |
1.68 |
1.68 |
2.44 |
2.92 |
3.23 |
4.01 |
4.93 |
4.93 |
|
b |
Min. |
15 |
18 |
21 |
24 |
30 |
38 |
38 |
38 |
|
Slot number |
0 |
0 |
1S |
2S |
2R |
3R |
4R |
4R |
|
|
t |
Max. |
0.97 |
0.97 |
1.4 |
1.61 |
1.91 |
2.42 |
2.54 |
2.54 |
|
Min. |
0.71 |
0.71 |
1.01 |
1.21 |
1.52 |
2.03 |
2.15 |
2.15 |
|
|
Thread and end type |
D,F,T |
D,F,T |
D,F,T |
D,F,T |
D,F,T |
D,F,T |
D,F,T |
D,F,T |
|
FAQ
A: We take every inquiry seriously. On working days, we will respond within 12 hours after receiving your inquiry.
A: We focus on the production of fasteners made of carbon steel, stainless steel, and low-alloy steel. We are a direct manufacturer with independent production capacity. ASME B18.6.5M (T11):2000 Metric Countersunk Head Square Drive Tapping Screw Factory. We own several fastener manufacturing facilities and have an international sales department, providing full-process services from production to export.
A: Customized production is our core business. We can develop and manufacture products based on the drawings or samples you provide.
A: Yes. In addition to custom products, we also produce general construction machinery parts (GET parts) for equipment such as excavators, including bucket teeth, tooth holders, corner blades, pins, clips, bolts and nuts. ASME B18.6.5M (T11):2000 Metric Countersunk Head Square Drive Tapping Screw Wholesale.
A: We have 12 energy-efficient and environmentally friendly modern production lines (including one fully automatic shell molding line and four heat treatment lines), with an annual production capacity exceeding 20,000 tons, enabling us to steadily meet various order requirements.
A: Trade terms (such as FOB, CIF, etc.) are confirmed when quoting. For batch production, we typically require a 30% deposit, with the balance paid against the copy of the bill of lading. T/T is the main payment method accepted, and L/C can also be negotiated.
A: We are only 35 km away from Shanghai Port and Ningbo Port, so sea freight is the main mode of transportation, which is convenient and efficient. For urgent deliveries, we can also arrange air freight via Ningbo or Shanghai airports.
About Us
Better Fastener is a professional fastener enterprise specializing in the manufacturing of steel washers, stainless steel washers, spring washers and sealingwashers. Founded in 2001 as a washer factory, the company expanded into a comprehensive enterprise integrating washers, nuts, bolts, spring nuts and other fastener products in 2010. ASME B18.6.5M (T11):2000 Metric Countersunk Head Square Drive Tapping Screw Suppliers in China.
The company positions itself as a provider of comprehensive one-stop services for customers, relying on technological R&D, industrial investment and trade distribution.
With an experienced professional team and a sound sales network, Better Fastener has achieved excellent sales performance in both domestic and foreign markets,and has grown into one of the competitive manufacturers and suppliers in China's industrial fastener industry.
Better Fastener is committed to becoming a trusted fastener supplier for customers with reliable product quality, reasonable prices and on-time deliveryNEWS