Yellow Zinc Hex Flange Head Self Drilling Screw

Yellow Zinc Hex Flange Head Self Drilling Screw | Structural Steel Fastener for Construction

Yellow Zinc Hex Flange Head Self Drilling Screw serves as essential construction fasteners for bulk steel structure project procurement and metal plate fixed connection. Hardware importers across South America order this fastener in large quantities for factory main frame installation, steel purlin fixing and thin steel sheet splicing works. The fastener adopts SAE1010 carbon steel and grade 410 stainless steel as raw blanks, fully complies with ASTM A555 manufacturing specification and ISO9001 quality management system certification. Integrated cold forging molding shapes hex flange head and sharp drill tip in one process without secondary welding treatment.

Complete Technical Parameter Specification Table

Item	Detailed Parameter	Implementing Standard
Base Raw Material	SAE1010 Carbon Steel / 410 Stainless Steel	ASTM A555
Surface Finishing	Yellow Zinc Plating, Blue White Zinc Plating, Stainless Steel Bright Polishing	ISO 1461 Hot-dip Galvanizing Norm
Head Design	Integrated Hexagonal Flange Head	DIN 6903
Drill Point Grade	Type 3 Heavy-Duty Drill Tip	ANSI B18.6.4
Available Sizes	ST4.2 to ST6.3	Custom thread length available
Valid Certification	ISO9001 Factory Audit Document, Mill Test Certificate for Raw Material	In-house Full Inspection Report

Construction teams rely on the stable anti-rust performance of Yellow Zinc Hex Flange Head Self Drilling Screw. The yellow zinc plated surface passes a continuous 48-hour neutral salt spray test to prevent early rust deterioration under semi-outdoor construction conditions. Ningbo Gangtong Zheli Fastener Co., Ltd. carries out full-cycle quality control for every production batch. Inspection procedures cover raw material spectral composition test, forging dimensional calibration, plating thickness detection and destructive drill performance test. All inspection documents are archived for customer quality traceability and third-party audit. The factory operates 12 cold forging production lines and 3 automatic electroplating workshops, reaching a daily output of 2.8 million finished screws to fulfill large-scale engineering purchase orders.

Standardized Production & Quality Control Workflow

Raw Material Incoming Inspection: Spectrometer verifies chemical composition of SAE1010 carbon steel to reject recycled inferior steel

Cold Forging Forming: One-step forming for flange head and drill tip to maintain high concentricity

Automated Electroplating: Controlled hanging plating keeps zinc coating thickness at 8μm–12μm

Salt Spray Aging Test: Corrosion resistance verification for yellow zinc finished fasteners

Automatic Visual Sorting: Eliminate defective goods with thread crack or deformed drill tip

Contractors for indoor steel frames, ventilation ducts and light steel keel projects choose Yellow Zinc Hex Flange Head Self Drilling Screw to raise overall construction efficiency. The integral flange face evenly distributes tightening pressure and avoids substrate bending under high torque fastening force. Ningbo Gangtong Zheli Fastener Co., Ltd. owns 16 years of professional fastener manufacturing experience, focusing on customized self-drilling screw solutions for overseas hardware importers. Three mature surface finishing options meet differentiated anti-corrosion demands from engineering clients in Brazil, Peru and Chile.

Core Advantages of Cooperation with Ningbo Gangtong Zheli Fastener Co., Ltd.

Full Standard Compliance: Products are produced per ASTM, DIN and ANSI standards; official certification papers support customs clearance and project bidding

Diversified Surface Treatment Solutions: Yellow zinc, blue white zinc and stainless steel finishes match different corrosion exposure environments

Rigorous QC Management: Complete test documents are provided to pass supplier qualification review for large infrastructure projects

Flexible Customization Service: Custom thread length and reinforced drill tip are acceptable for small-batch special requirements

Rich South American Market Experience: Long-term cooperative relations with local hardware distributors, familiar with regional construction fastening habits

FAQ | Frequently Asked Questions for Fastener Purchasers

Q1: Which raw material works best for construction near coastal high-humidity areas?

A1: Select 410 stainless steel hex flange head self drilling screw. Solid stainless steel base effectively resists coastal salt mist erosion without galvanized coating peeling and aging.

Q2: Can your factory supply formal certification documents for project bidding use?

A2: We supply ISO9001 certification, raw material mill test report, salt spray test certificate and dimensional inspection report for bidding document compilation.

Q3: Can the standard drill tip drill thick carbon steel plates directly?

A3: Type 3 original drill tip supports direct drilling on steel plates ranging from 1.5mm to 6mm. Reinforced drill tip customization is available for thicker steel plates.

Q4: How to compare anti-corrosion performance among three different surface finishes?

A4: We can provide independent salt spray test reports for yellow zinc, blue white zinc and stainless steel finished screws to assist your engineering design selection.

Integrated flange self-drilling fasteners combine drilling, thread tapping and locking into one operation to cut construction labor hours for steel structure builders. Three surface treatments build a cost-performance product matrix covering indoor dry construction, semi-outdoor ventilation pipeline installation and coastal high-humidity engineering. This screw series stays a staple inventory product for wholesale hardware merchants across South America.