What is a Flat head screw?
Flat Head Screws, also called Countersunk Screws, is conical with a flat outer face and a tapering inner face. An advantage to this type of screw is that very little of the head protrudes beyond the surface, allowing it to sink into the material. Flathead screws are characterized by having a head with a flat top and bottom that is cone-shaped or countersunk. With this design, the head of the screw can align flush or below the surrounding surface having obvious benefits.
Flat Head Screw Application
Flathead screws are used a lot in the building industry for cabinets, countertops, stairs, furniture, drywall, and other components. Flathead screws are ideal for these applications because they’re flush with the surface.
Flat Head Screw Types
Flat Head screws are characterized by having different drive types and materials as follows.
- Hex Drive Flat screws
- Flat head machine screw
- Phillips Flat screws
- Slotted Flat screws
- Nylon Slotted Flat screws
- Torx Flat screws
- Tamper resistant Flat screws
- Sealing Flat screws
- Vented Flat Head screws
- Threaded Flat Head screws
- Tapping screws
- thread forming screw
- Binding Barrels and screws
- Elevator bolts
- plow bolts
- shoulder screw
- Weld stud
- weld on stud anchors
Flat Head Screw Dimensions Chart
Flat head machine screw size chart DIN has flat head screws has slotted flat head screws, Phillips flat head screws, hexagon flat head screws, Torx flat head screw, and so on. Its head diameter and head height are standard to query, if you need to customize flat screws, you can reach Heatfastner
DIN EN ISO 7046 2011 Countersunk Flat Head Screws (Common Head Style) with Type H or Type Z Cross Recess
| Thread size(d) | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P | Pitch | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | |
| a | max | 0.7 | 0.8 | 0.9 | 1 | 1.2 | 1.4 | 1.6 | 2 | 2.5 | 3 | |
| b | min | 25 | 25 | 25 | 25 | 38 | 38 | 38 | 38 | 38 | 38 | |
| dk | theory | max | 3.6 | 4.4 | 5.5 | 6.3 | 8.2 | 9.4 | 10.4 | 12.6 | 17.3 | 20 |
| dk | actual | max=nominal size | 3.0 | 3.8 | 4.7 | 5.5 | 7.3 | 8.4 | 9.3 | 11.3 | 15.8 | 18.3 |
| min | 2.7 | 3.5 | 4.4 | 5.2 | 6.94 | 8.04 | 8.94 | 10.87 | 15.37 | 17.38 | ||
| k | max=nominal size | 1 | 1.2 | 1.5 | 1.65 | 2.32 | 2.7 | 2.7 | 3.3 | 4.65 | 5 | |
| r | max | 0.4 | 0.5 | 0.6 | 0.8 | 0.9 | 1 | 1.3 | 1.5 | 2 | 2.5 | |
| x | max | 0.9 | 1 | 1.1 | 1.25 | 1.5 | 1.75 | 2 | 2.5 | 3.2 | 3.8 | |
| Socket No | 0 | 0 | 1 | 1 | 2 | 2 | 2 | 3 | 4 | 4 | ||
| M1 | Type H | ref | 1.6 | 1.9 | 2.9 | 3.2 | 4.4 | 4.6 | 5.2 | 6.8 | 8.9 | 10 |
| Penetration depth | Type H | max | 0.9 | 1.2 | 1.8 | 2.1 | 2.4 | 2.6 | 3.2 | 3.5 | 4.6 | 5.7 |
| min | 0.6 | 0.9 | 1.4 | 1.7 | 1.9 | 2.1 | 2.7 | 3 | 4 | 5.1 | ||
| M2 | Type Z | ref | 1.6 | 1.9 | 2.8 | 3 | 4.1 | 4.4 | 4.9 | 6.6 | 8.8 | 9.8 |
| Penetration depth | Type Z | max | 0.95 | 1.2 | 1.73 | 2.01 | 2.2 | 2.51 | 3.05 | 3.45 | 4.6 | 5.64 |
| min | 0.7 | 0.95 | 1.48 | 1.76 | 1.75 | 2.06 | 2.6 | 3 | 4.15 | 5.19 |
ISO 14581 – 2013 Fasteners — Hexalobular Socket Countersunk Flat Head Screws
DIN 34811 – 1999 Plastic Flat Head Screws With Cross Recess
ISO 2009 – 2011 Slotted Countersunk Flat Head Screw
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