What is the lead time for delivery?

Delivery takes 15-25 days for a 1x20'GP container and 25-35 days for 2-5x20'GP containers.

What is the main application of these drywall screws?

They are mainly used for fixing and connecting iron joists and recycled wooden products.

Black Drywall Screw/Phosphated and Galvanized 3.5*25/35

Name: Black Drywall Screw/Phosphated and Galvanized 3.5*25/35
Brand: SHANDONG TOP BUILDING MATERIALS CO., LTD.
SKU: 765925582

Shandong, ChinaSHANDONG TOP BUILDING MATERIALS CO., LTD.

US$3.00

1,000 Boxes

Product profile

Customization

Available

Material

Carbon Steel

Shape of Head

Round

Model NO.

3.5*25/35mm

Surface Finishing

Zinc Plated

Certification

ISO

Customized

Transport Package

in Carton

Trademark

ELST

Origin

Lingyi, China

HS Code

7318140090

Production Capacity

100000ton

Key features

Customizable Thread Type: Offers coarse thread, twinfast thread, or customized types as per requirements.

Wide Diameter Range: Available in diameters from M3.5 (#6) to M4.8 (#10) for versatile applications.

Multiple Surface Finishes: Options include Zinc Plated, Black/Grey Phosphated, Blue Galvanized, and Black Oxide.

High-Quality Materials: Manufactured from hardened Carbon Steel (C1022A/C1022), alloy steel, or stainless steel.

ISO Certified Quality: Products meet ISO9001-2008 standards ensuring A Grade top quality and stability.

Flexible Packaging: Customizable packing options including boxes, cartons, pallets, and dunnage bags.

Company profile

SHANDONG TOP BUILDING MATERIALS CO., LTD.

Shandong, China

Business Type: Manufacturer/Factory, Trading Company, Group CorporationExport Year: 2005-08-08Nearest Port: Qingdao, Lianyungang, TianjingAverage Response Time: ≤8.57hTerms of Payment: LC, T/T, Western UnionInternational Commercial Terms(Incoterms): FOB, CFR, CIF, EXW

AI-Powered supplier vetting

SummaryShandong Top Building Materials Co., Ltd. is identified as a China-based limited company with trading and manufacturing activities in construction and decoration materials. The supplied information indicates substantial gypsum board, ceiling tile, metal frame, PVC film, and ceiling T-bar production capacity, supported by multiple production lines, quality-control personnel, R&D engineers, and listed management-system certifications. The company reports export activity since 2005, self-operated import and export rights, broad overseas market coverage, and an off-peak lead time within 15 working days. Its stated customer-centered service and quality commitments support service capability, but evidence of specific after-sales processes, customization projects, financial reliability, and detailed customer references is limited. The records also contain inconsistencies in location, production-line count, and output descriptions, so some assessments remain qualified.

Supplier typeThe supplier is described as a trading company, manufacturer/factory, and group corporation, with construction and decoration materials as a stated business area. Its product keywords include gypsum board, ceiling tiles, galvanized frames, PVC panels, joint compound, and other building materials, indicating both trading and manufacturing involvement.

CertificationsThe supplier lists ISO 9000, ISO 14000, ISO 9001, ISO 14001, ISO 20000, and ISO 14064 certifications. The information explicitly records multiple quality, environmental, service-management, and related management-system certifications, although certificate scope and validity details are not provided.

R&D capabilityThe supplier reports 31–40 years of total R&D engineer experience and states that it continues improving production technology and equipment to develop higher-grade products. This supports technical development capability, but no specific patents, new product launches, laboratory resources, or quantified innovation outcomes are provided.

Production capacityThe supplier reports large-scale production of gypsum boards and ceiling products, five production lines, 11–20 quality-control staff, and output figures covering gypsum board, PVC gypsum ceiling tiles, galvanized metal frames, PVC film, and ceiling T-bars. It also reports a lead time within 15 working days during off-peak seasons and exports to multiple regions. The slices contain differing production descriptions, including four PVC gypsum tile lines in one record versus five total lines in another, so capacity should be verified directly.