Product and application brief
A timber-to-steel wing driller combines a cutting drill point with projecting clearance wings and a threaded shank. The wing feature concerns passage through the board; it is a different selection axis from head shape. An ordinary countersunk drill screw is not automatically a wing driller.
Product forms and reference names
| Choice or field | What to identify |
|---|---|
| Timber-to-steel clearance-wing construction | SFS SC5/SC6 describes wings opening clearance in a wood-based board and breaking at the steel support. This is a manufacturer-defined arrangement, not a guarantee for every board or metal. |
| Flush-seat catalogue example | SFS SCS3 identifies a winged timber-to-steel fastener with a milling head. Its selected drive and material are code-specific; the generic image is not that supplied model. |
| Wafer-head catalogue example | EJOT WDLS 5.5 is a timber/sheathing-to-steel wing driller with a wafer head and no washer. Winged does not mean that every product is countersunk or carries a sealing washer. |
| Head-form standard versus wing feature | ISO 15482:1999 identifies cross-recessed countersunk-head drilling screws with tapping screw thread; ISO lists it as confirmed in 2024. That public identity alone is not evidence of a specified wing geometry or a timber-to-steel assembly approval. |
Clearance wings and receiving support
In the documented SFS and EJOT arrangements, the wings enlarge the board passage before the thread reaches the receiving steel and then break on contact with that support. Identify the board and support separately. Do not transfer this mechanism to an arbitrary steel thickness, alternative substrate or plain pointed wood screw.
Head seat is a separate choice
A countersunk or milling head is selected with the board surface and seating requirement; a wafer head remains a different geometry. Specify head profile, diameter, seating detail and drive explicitly. Do not substitute a broad head, countersink angle or washer assembly by appearance.
Point, thread and length review
Provide the exact selected code or drawing, point designation, thread profile, total length and measurement convention. List board thickness, intervening layers or gaps and receiving steel thickness independently. Drilling range, clamping range and required thread engagement are separate selected-product checks, not values inferred from the overall screw length.
Material, installation and qualification
Specify body and point construction, finish, environment and the selected installation instructions. Stainless body, hardened point and bimetal construction are not interchangeable descriptions. Manufacturer approvals and tool codes apply only to their documented products and assembly conditions; no FastenerBridge certification, tool compatibility, torque, load rating or stock is verified here.
Specification fields
| Choice or field | What to identify |
|---|---|
| Product identity | Wing driller for the stated board-to-support assembly; exact manufacturer reference for identification, standard edition or controlled drawing and revision. |
| Board and joint stack | Wood/board type, thickness, surface layers, gaps and any intermediate sheet, stated separately. |
| Receiving support | Support material/grade and actual thickness; required documented drilling range for the selected fastener. |
| Head and drive | Countersunk/milling or wafer profile, seating geometry, diameter and exact drive/bit designation. |
| Point and wings | Point form, wing location and clearance geometry from the selected drawing; installation direction and intended wing-break support. |
| Thread and length | Diameter and units, thread designation, threaded length, overall-length datum, required clamping range and engagement checks. |
| Material and finish | Body/point construction, selected material and coating with environment and inspection requirements; no inferred corrosion life. |
| Installation evidence | Selected-product setting instructions, tooling/access and assembly qualification requirements; request supporting documents without assuming approval. |
| Quantity and destination | Pieces, packing/traceability needs, drawing or part reference and destination; actual supply and timing require quotation confirmation. |
Common product questions
Is every countersunk self-drilling screw winged?
No. The head seat and clearance wings are independent structural choices. A countersunk reference or a drill point alone does not establish a wing feature.
Can a wing driller replace any roofing screw?
No. Board-to-steel clearance wings do not establish sealing-washer performance or suitability for a roof-sheet assembly. Identify the complete joint and selected fastener.
Does screw length establish drilling capacity?
No. Overall length, board clamping range, drill point and receiving steel thickness are separate inputs. Confirm the selected product documentation and assembly conditions.
Related product choices
- Countersunk head and drive choices
- Body and point material construction
- Roofing and sealing-washer assemblies
- Drilling-screw enquiry checklist
Product references
References checked 10 October 2026 identify structures, not FastenerBridge stock, certification or brand affiliation. Final requirements follow the selected specification. No universal dimensions, load rating or tightening torque is stated.