Selectron 3.5x25 Self-Drilling Drywall Screw (1,000 Pieces)

Selectron 3.5×25 Drywall Screw — Drill‑Point, Fine‑Threaded (1,000 Pieces)

The Selectron 3.5×25 mm Drill‑Point Drywall Screw is a fastener manufactured for quick, secure fixing of drywall panels to steel framing. With its self‑drilling point, it penetrates steel up to 1.5 mm thick without pre‑drilling, cutting down labour time. Its compact 25 mm length is ideal for thinner drywall applications, securing the top layer in double‑layer systems, or use with narrow‑profile framing. The black phosphate coating protects against corrosion, while the bugle head design seats neatly without damaging the drywall surface. The 1,000‑piece pack offers an economical, practical solution for professional teams.

Technical Specifications

• Brand: Selectron
• Stock Code: SMUAV3525 / Sel 3.5*25/Dw/M
• Type: Drill‑Point Drywall Screw — Fine‑Threaded
• Diameter: 3.5 mm
• Length: 25 mm
• Head Type: Bugle Head — PH2 Phillips Drive
• Thread Pattern: Fine‑Threaded — narrow thread spacing optimised for steel sections
• Point Style: Drill‑Point — self‑drills steel up to 1.5 mm wall thickness
• Coating: Black Phosphate / Black Oxide — corrosion resistance
• Material: High‑Carbon Steel — Hardened
• Compatible Framing: Steel sections 0.5–1.5 mm wall thickness
• Standard: DIN 18182‑2 / EN 14566
• Packaging: 1,000 pieces per pack

Applications

• Single‑layer 9.5 mm and 12.5 mm drywall installations (narrow section + thin panel combinations)
• Securing the top layer in double‑layer drywall systems
• Partition wall and suspended ceiling systems with steel framing
• Light‑gauge (0.5–1.0 mm) steel profile framing
• Interior finishing for offices, residences, and commercial spaces
• Renovation, repair, and small‑scale installation work
• Back‑panelling for site‑built cabinetry and furniture
• Daily stock and high‑volume use by professional crews

Product Advantages

• Drill‑point design — self‑drills through steel sections without pre‑drilling, saving time and labour on site
• Compact 25 mm length — ideal for short‑reach connections; reduced risk of protruding through the back
• Fine‑thread profile — more threads engage with steel; resists slipping and loosening for a firm connection
• Bugle head — seats cleanly without damaging the drywall surface, leaving a perfectly smooth base ready for finishing
• PH2 Phillips drive — screwdriver bit seats fully with no slipping or wear, ensuring reliability in high‑volume work
• Black phosphate coating — resists rust under indoor conditions; invisible beneath plaster and paint for a neat appearance
• Hardened steel — resists wear during drilling; high resistance to bending and breakage
• 1,000‑piece pack — easy to transport on site; lowers unit cost; ideal quantity for ongoing use

Installation & Assembly Recommendations

• Drive the screw perfectly perpendicular to the panel; angled entry reduces drilling efficiency and weakens hold
• Ensure the head sits flush with the surface; do not drive too deep and tear the paper facing
• Edge distance — install screws no closer than 10–15 mm from the panel edge; prevents edge cracking
• Section thickness — suitable for direct installation up to 1.5 mm; use 35 mm or 45 mm lengths for thicker sections
• Driving speed — operate at the correct rotation; excessive speed causes the point to overheat and reduces performance
• Not recommended for wood framing — coarse‑threaded sharp‑point models perform better in timber applications
• Storage — keep in dry conditions; select stainless steel versions for permanently damp or outdoor environments

Frequently Asked Questions

How does it differ from the 3.5×35 version?
The 25 mm is shorter — suited for 9.5 mm drywall, top‑layer fixing, or narrow profiles. The 35 mm is better for standard single‑layer 12.5 mm boards.

Is it the same as the sharp‑point type?
No — the drill‑point version cuts steel itself without pre‑drilling. Sharp‑point types are typically used in wood or thin sheet metal.

Can it be used in double‑layer drywall?
Not sufficient for the base layer; suitable only for securing the top layer — use 35 mm or 45 mm screws for the base connection.

How many screws should I use?
Standard spacing: 200–250 mm along edges, 300–400 mm across the field.

Will it rust?
Phosphate coating is adequate for indoor use; choose stainless steel for consistently damp or outdoor applications.