Product Summary

Longze Cross Recessed Pan Head Self-Tapping Screws are high-precision fasteners manufactured to DIN 7981 et ISO 7049 standards, widely used in sheet metal assembly, electronic enclosures, plastic

moldings, and household appliances. Featuring a rounded pan head and a Phillips (cross) drive, these Longze Cross Recessed Pan Head Self-Tapping Screws are engineered to tap their own threads into pre-

drilled holes, providing a secure, vibration-resistant connection with a clean, low-profile aesthetic.

• ✔ Versatile Clamping Force: The flat bearing surface under the pan head distributes pressure evenly, preventing damage or pull-through in thin metal or plastic substrates.

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• ✔ High-Efficiency Cross Recess: Designed for rapid manual or automated installation with Phillips drivers, reducing bit slippage and assembly time.

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• ✔ Hardened Thread Technology: Case-hardened threads ensure the screw can cut clean, sharp internal threads into various materials without deformation.

Key Features of Cross Recessed Pan Head Self-Tapping Screws

• Universal Applicability – Ideal for securing thin metal sheets to metal frames or mounting plastic components to metal bases.

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• Low-Profile Head – The rounded top provides a professional, snag-free finish while maintaining a higher profile than countersunk screws for extra torque strength.

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• Résistance à la corrosion – Offered in Zinc Plated for cost-effective protection and Marine Grade SS316 for harsh chemical or outdoor exposure.

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• Standardized Precision – Fully compliant with Metric (ISO/DIN) et Imperial (ASME) specifications for global trade and engineering.

Technical Specifications

• Standards: DIN 7981 / ISO 7049 / ASME B18.6.3 / JIS B1115

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• Metric Size Range: ST2.2 to ST9.5

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• Inch Size Range: #2 to 3/8" (Equivalent diameters)

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• Point Types: Type C (Pointed) / Type F (Flat end) / Type R

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• Material: Case-Hardened Carbon Steel, Stainless Steel (A2 / A4)

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• Finish: Zinc Plated (Clear/Blue/Yellow), Black Oxide, Nickel Plated, Plain

• Material & Mechanical Properties

• Matériel	Grade	Surface Hardness	Core Hardness	Ductility
  Acier au carbone	C1022A (Hardened)	$\ge 450$ HV	270 to 390 HV	High (Cold Headed)
  Acier inoxydable	SS304 (A2)	N/A	$\ge 210$ HV	Excellent
  Acier inoxydable	SS316 (A4)	N/A	$\ge 240$ HV	Excellent (Marine)

• Standard Dimensions (Metric DIN 7981)

• Size (ST)	Pitch	Head Dia (dk max)	Head Height (k max)	Phillips Drive No.
  ST3.5	1.3 mm	6.90 mm	2.60 mm	2
  ST4.2	1.4 mm	8.20 mm	3.05 mm	2
  ST4.8	1.6 mm	9.50 mm	3.55 mm	2
  ST5.5	1.8 mm	10.80 mm	3.95 mm	3

• Surface Treatment

• Coating	Process	Salt Spray	Application
  Zinc Plated	Electroplating	72 to 144h	General Industrial / Electronics
  Black Zinc	Electroplating	48 to 96h	Automotive Interior / Optics
  Nickel Plated	Electroplating	96 to 120h	Decorative / Precision Tools
  Passivated	Chemical	1000+h	Stainless Steel Marine Grade