Product Summary

Longze Black Phosphated Drywall Screws (also known as Gypsum Screws) are high-performance fasteners manufactured to DIN 18182-2 and ASTM C1002 standards, specifically designed for securing gypsum

boards (drywall) to metal studs or wood framing. Featuring a Bugle Head and Phillips Drive, these Longze Black Phosphated Drywall Screws are engineered with a sharp point and specialized threads to

penetrate substrates rapidly while the unique head shape prevents tearing of the paper surface.

• ✔ Specialized Bugle Head: The curved surface under the head allows the screw to sink into the drywall without breaking the protective paper face, ensuring a clean finish for plastering.

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• ✔ Black Phosphate Coating: This chemical treatment provides an excellent base for joint compound and paint while offering basic corrosion resistance during the construction phase.

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• ✔ Rapid Penetration: Available in Fine Thread (for light-gauge metal studs) and Coarse Thread (for wood framing) to ensure maximum withdrawal resistance.

Key Features of Black Phosphated Drywall Screws

• Sharp Needle Point – Designed for immediate "bite" into the material, allowing for one-handed installation on ceilings and high walls.

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• Phillips #2 Recess – The industry-standard drive depth ensures the driver bit seats securely, minimizing "cam-out" and protecting the screw head.

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• High-Tensile Carbon Steel – Case-hardened to prevent snapping or head-shearing when driving into dense metal tracks.

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• Anti-Slip Surface – The matte phosphate finish provides more friction for the screwdriver bit compared to smooth zinc plating.

Technical Specifications

• Standards: DIN 18182-2 / ASTM C1002 / EN 14566

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• Metric Size Range: 3.5 mm to 4.8 mm (Diameter)

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• Inch Size Range: #6 to #10 (Diameter)

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• Length Range: 13 mm to 150 mm (1/2" to 6")

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• Thread Type: Fine Thread (S-Point) / Coarse Thread (Sharp Point)

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• Drive Type: Phillips #2 (Cross Recess)

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• Finish: Black Phosphate / Grey Phosphate

• Thread Selection & Applications

• Thread Type	Best Application	Material Thickness	Feature
  Fine Thread	Light Gauge Metal Studs	$\le 0.88$ mm	Dual-lead threads for fast metal penetration.
  Coarse Thread	Wood Studs / Timber	N/A	Deep, wide threads for maximum grip in wood.
  Drill Point	Heavy Gauge Metal	0.9 mm to 2.5 mm	Self-drilling tip for structural steel tracks.

• Standard Dimensions (Metric DIN 18182-2)

• Size (d)	Head Dia (dk)	Phillips No.	Theoretical Weight (kg/1000pcs)	Common Lengths
  3.5 mm (#6)	8.0 to 8.5 mm	PH2	1.30 (for 25mm)	19, 25, 32, 35, 38, 45, 50 mm
  3.9 mm (#7)	8.0 to 8.5 mm	PH2	1.65 (for 35mm)	25, 35, 45, 50, 55 mm
  4.2 mm (#8)	8.2 to 8.8 mm	PH2	2.50 (for 50mm)	32, 38, 45, 50, 65, 75 mm
  4.8 mm (#10)	8.5 to 9.5 mm	PH2	4.20 (for 75mm)	75, 90, 100, 125, 150 mm

• Surface Treatment

• Coating	Process	Advantage	Application
  Black Phosphate	Chemical Dip	Better paint/mud adhesion	Standard interior drywall
  Grey Phosphate	Chemical Dip	Higher corrosion resistance	High-humidity interior areas
  Zinc Plated	Electroplating	Bright finish / Rust proof	Visible hardware / General DIY