Countersunk Head Self-Tapping Screws
Product Overview
This product is a 3.8×65mm T17 cutting-point fine-thread self-tapping screw, made of S410 martensitic stainless steel, with a bright passivation (pickled and passivated) finish that presents a uniform, lustrous metallic silver appearance. Featuring a countersunk Torx drive recess combined with a T17 fluted cutting point and full-length fine-pitch threads, it offers dual capability for both wood tapping and thin metal drilling. It can quickly fasten panels and aluminum profiles without the need for pre-drilling, making it a high-strength general-purpose fastening component widely used in furniture manufacturing, aluminum-wood window and door construction, and interior decoration projects.
Product Applications
Furniture Manufacturing: Joining thick solid wood panels in kitchen cabinets, wardrobes, floor joists, and wall cladding.
Window & Door Assembly: Fastening aluminum and aluminum-wood composite window/door frames, hinges, and aluminum-wood connections.
Interior Decoration: Wood substrate for suspended ceilings, preserved wood platforms, and light-gauge steel/wood furring construction.
Commercial Display Fixtures: Assembling shelving units and display cabinets, combining aluminum frames with wood panels.
Note: This product is suitable for indoor dry environments. For coastal areas or long-term outdoor rain exposure, SS304 stainless steel versions are recommended instead.
Product Features
Corrosion-Resistant & Durable Material: S410 stainless steel, heat-treated for high hardness, can drill into wood and 1–3mm thin aluminum sections; inherently magnetic, making it compatible with magnetic power driver bits. The pickling and passivation treatment eliminates the risk of coating flaking, providing stable surface rust resistance with a clean, uniform appearance.
T17 Cutting Point: The fluted cutting edge at the tip automatically clears chips during driving, reducing the risk of wood splitting and cracking. Offers low threading resistance, making deep fastening into thick panels more efficient.
Fine Thread for High Locking Strength: Full-length fine-pitch threads provide a large contact area for strong pull-out resistance, preventing stripping and loosening in soft materials. The 65mm extended length is ideal for joining thick panels.
Countersunk Torx Recess: The countersunk head sits flush with the panel surface after installation; the Torx recess provides even torque distribution, resisting cam-out and reducing driver bit wear.
| Material | 410 stainless steel |
| Surface treatment | Pickled and passivated + heat treatment |
| Head type | Countersunk head |
| Slot type | Cross recess |
| Thread type | Partial thread |
| Screw diameter | Approx. 3.8mm |
| Screw length | 65mm |
| Screw type | Self-tapping screw |
| Corrosion resistance | Medium (suitable for humid, outdoor, and mildly acidic/alkaline environments) |
| Applicable tools | Phillips screwdriver or power tools |

+86 15856352820

malingfei@linghongscrew.com

No. 56, Baishizhan Road, Economic Development Zone, Langxi County, Xuancheng City, Anhui Province, China
