Can I mix different models in one container?

Yes, different models can be mixed in one container, but the quantity of each model should not be less than MOQ.

How does your factory do regarding quality control?

We always pay great attention to quality control from the very beginning and every product was tested piece by piece before delivery.

Do you have quality certification?

Yes, we have CE, SGS, ISO, ect.

Galvanized Hex Head Self Drilling Roofing Screw

Name: Galvanized Hex Head Self Drilling Roofing Screw
Brand: TIANJIN GRAND METAL CO., LTD.
SKU: 1917873942

Tianjin, ChinaTIANJIN GRAND METAL CO., LTD.

US$1,500.00-1,530.00

2 Tons

Product profile

Material

Carbon Steel

Type

Hexagon Head

Groove

Hexagon

Model NO.

Connection

Common Bolt

Head Style

Hexagonal

Standard

Grade

4.8

Shank Type

Screw

Surface Treatment

Bright Zinc Galvanized

Steel Grade

C1022A Carbon Steel

Screw Point Type

3#/4# Drill Point

Transport Package

500g/Bag, 1kg/Bag, 5kg/Box, or Bulk N.W.20kgs/CTN

Specification

4.2X16mm-6.3X150mm

Trademark

GRANDMETAL

Origin

China

HS Code

73170000

Production Capacity

1000tons Per Month

Key features

Bright Zinc Galvanized: Surface treatment provides excellent corrosion resistance for roofing applications.

Self Drilling Capability: Features 3#/4# drill points for direct installation without pre-drilling holes.

Customizable Carton Print: Professional designers available to customize carton printing according to requirements.

OEM Service Available: Supports OEM customization from samples for specific product needs.

EPDM Washer Included: Comes with EPDM washers to ensure watertight sealing and prevent rust.

Flexible Packing Options: Available in bags, boxes, or bulk with desiccant bags to prevent rust during shipping.

Quality Certification: Products certified with CE, SGS, and ISO standards for reliability.

Factory Direct Supply: Direct from manufacturer with own factory and cooperative network in China.

Company profile

TIANJIN GRAND METAL CO., LTD.

Tianjin, China

CertifiedBusiness Type: Trading Company CertifiedCustomization Options: Customization from Samples CertifiedExport Year: 10 Years CertifiedNearest Port: Tianjin PortAverage Response Time: ≤2.09h CertifiedTerms of Payment: LC, T/T, D/P, etc.

AI-Powered supplier vetting

SummaryThe supplier presents itself as a specialized steel manufacturer and exporter with four production lines, 50 quality-control staff, and export markets in South America, Africa, and Australia. It reports customization from samples and lead times within 15 working days in both peak and off-season periods. However, the investigation identifies limited documented management evidence: no stated 3D design, ODM, SDK, or popular-brand OEM capability; no inventory, overseas warehouse, overseas showroom, overseas agent, or branch capability; and no participation in offline trade shows. Supplier-management, corrective-action, and complaint-handling procedures exist but lack written records, while quality-control testing equipment is reported as zero. Certification details are recorded only as “Others,” and the financial slices contain zero values for several recent indicators, making financial credibility difficult to verify.

Supplier typeThe supplier is explicitly described as a specialized steel manufacturer with an integrated research, manufacturing, and distribution system, while another slice states it is not a professional technical supplier. This supports classification as a steel manufacturing/export supplier rather than a professional technical-services supplier.

R&D capabilityThe supplier claims technical research strength and product-detection equipment, but the investigation records only one year of total R&D-engineer experience, no new products in the past year, and no 3D software design, ODM, SDK, or popular-brand OEM capability. The evidence shows limited demonstrated innovation capability.

Production capacityThe supplier reports four production lines, 50 quality-control staff, and a specialized steel manufacturing operation, with lead times within 15 working days in both peak and off-season. However, quality-control test equipment is reported as zero, and quality assurance and traceability statuses are unknown, so production capacity is supported but production-control maturity is not fully established.

Customization capabilityThe supplier explicitly provides customization from samples and accepts several quotation and payment terms, indicating an ability to support sample-based customization. No broader engineering, 3D-design, ODM, or SDK capability is reported.