Square Drive Flat Head Self Tapping Screws
Standard: ASME B 18.6.5M
Thread Type: Self-Tapping Thread
Commodity: Square Drive Flat Head Self Tapping
Also Named: Flat Head Metal Screws
Material: Carbon Steel
Diameter: ST2.9×0、ST3.5×1R、ST4.2×2R、ST4.8×2R、ST5.5×3R、ST6.3×3R、ST8×4R、ST9.5×4R
Finish: Plain, Black Oxide, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated
Head Type: Pan Head
Drive Type: Square Drive
MOQ: 1000kgs
Lead Time: 30 to 60 days
Product Introduction
AYA Fasteners (Hebei) Co., Ltd. is one of the most experienced manufacturers and suppliers of square drive flat head self tapping screws in China. Please feel free to buy high quality square drive flat head self tapping screws made in China here from our factory. For price consultation, contact us.

As a global supplier of customized fastening solutions, AYA's service process is also as close to customers as AYA's products. From describing needs to follow-up services, AYA will promptly and spare no effort to help customers solve any fastening problems that arise, to eliminate the concern of customers.
PRODUCT DESCRIPTION
Product Name | Square Drive Flat Head Self Tapping |
Also Named | Flat Head Metal Screws |
Material | Carbon Steel |
Standard | ASME B 18.6.5M |
| Form/Shape Of Tip | Type B |
Diameter | ST2.9×0、ST3.5×1R、ST4.2×2R、ST4.8×2R、ST5.5×3R、ST6.3×3R、ST8×4R、ST9.5×4R |
Finish | Plain, Black Oxide, Zinc Plated, Hot Dipped Galvanized, Oxidation, Dacromet, Phosphating, Cadmium Electroplate, Nickel Plated |
Head Type | Pan Head |
Drive Type | Square Drive |
Thread Type | Self-Tapping Thread |
DIMENSIONS TABLE

| Screw Thread 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 | Ref. | 1.78 | 2.31 | 2.84 | 2.84 | 3.38 | 3.38 | 4.85 | 4.85 |
| T | Ref. | 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 |
| Socket No. | 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 | |
| Type of Thread and Point | 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 | |
| Screw Thread 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 | Ref. | 1.78 | 1.78 | 2.31 | 2.84 | 2.84 | 3.38 | 4.85 | 4.85 |
| T | Ref. | 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 |
| Socket No. | 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 | |
| Type of Thread and Point | D,F,T | D,F,T | D,F,T | D,F,T | D,F,T | D,F,T | D,F,T | D,F,T | |
PRODUCT DETAILS

PRODUCT ADVANTAGES

ADVANTAGES OF Square Drive Flat Head Self-Tapping Screws
1.Self-tapping screws are some of the most common types, making them easier and more efficient to install because of accessibility to tools
2.Comes with a square head, it can be installed quickly and easily even in a blind or narrow environments.
3.Square drive flat head self-tapping are suitable for all kinds of commercial and industrial applications because of their durability and resistance to external damages
4.Made from corrosion- and oxidation-resistant materials for increased reliability and longevity
5. All AYA products undergo meticulous quality control to ensure that all customers receive the same high standards associated with our fasteners
6.AYA employs a dependable system of global agents including overseas warehouses and logistics partners for efficient delivery
QUALITY INSPECTION

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WHY CHOOSE AYA?
AYA provides exclusive services to 1000+ members from all over the world every year, with a unique chain service solution system, you only need to click the mouse to get exclusive fastening solution and enjoy door-to-door services.
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