We have most sizes in stock. For orders under 5,000 pcs, the lead time is 5-7 days.

Can we customize the production?

Yes,we can make mold to produce,you only send us your request with detailed drawings or photos, then we will make the quotation for you accordingly.

Can I get a better price for bulk orders?

Definitely. Our prices are negotiable. The more you order, the more discount you will get. Please contact us for a tailored offer.

Are your products certified? Can I get the certification files?

All our products comply with industry standards and hold valid certificates. Please send us a message, and we will provide you with the relevant certification documents promptly.

Can you offer detailed dimension drawings and specifications?

We have complete size data for all items. Feel free to contact us to receive the detailed product dimensions.

Why choose hex flange diamond screws for HVAC ducts?

Integrated flange washer prevents leakage, self-drilling tip cuts metal plates without pre-drilling.

What thickness metal sheets fit this diamond drill screw?

Suitable for 0.5mm-4mm galvanized steel sheets, ventilation pipes and metal brackets.

Can you customize surface coating and sizes for HVAC engineering orders?

Custom length, diameter, zinc plating and black oxide coating are available.

Will the flange head screw loosen under long-term air pipe vibration?

Serrated flange surface increases friction, effectively anti-loosening under pipeline vibration.

Do you offer bulk wholesale for HVAC installation companies?

Factory direct bulk supply, mixed sizes and export neutral packaging supported.

Hex Flange Head Diamond Screw for Piping HVAC Systems

Name: Hex Flange Head Diamond Screw for Piping HVAC Systems
Brand: Qewitco Fasteners Co., Ltd
SKU: 2156111472

Shandong, ChinaQewitco Fasteners Co., Ltd

US$0.03-0.50

1,000 Pieces

Sample price:US$0.15/piece.Request sample

Product profile

Customization

Available

Material

Carbon Steel

Shape of Head

Hex Flange Head

Model NO.

tapping screw

Shape of Groove

External Hex

Surface Finishing

Ruspert Blue

Certification

ISO, GS, RoHS, CE

Customized

Delivery

20-30 Days

Packag Color

Customizable

Thread Standard

Unc/Unf/Unef/Uns/Bsw/Bsf/Metric Coarse/Metric Fine

Custom Order

Customization by Drawing/Sample

ODM/OEM

Available

Service

Custom-Made Service

Size Standard

Metric

Material Test Certificate

Have

Sample

Samples in Stock Are Free with Freight Collect

Price Terms

Fob/CFR/CIF/DDP/DAP

Quality Control

100% Quality Inspection

Application2

Connection,Fastening,Concrete Projects,Container

Function

Multi-Purpose Fastener Screw

Thread Structure

Hi-Lo Thread Screws

Tail Structure

Diamond

Transport Package

Bulk Pack Small Boxed

Specification

M4-M20

Trademark

Customized

Origin

China

HS Code

731816

Production Capacity

10000ton/Year

Key features

We are a Factory Direct Supplier: Professional manufacturer of concrete screws, factory direct supply without middlemen markup.

Multiple Materials & Surface Finishes: Material: Carbon Steel, SS304, SS316 Surface treatment: Yellow Zinc Plating (Hot Selling), Blue White Zinc Plating, Geomet, Plain

Various Head Types & Thread Options:Head types: Hex Flange Head, Pan Head, Countersunk Head Threads: Single Thread, High-Low Thread. High-low thread can tap internal thread automatically for firm lock

Negotiable Price: Competitive price with flexible negotiation based on your order quantity.

Strict Quality Assurance: 100% quality guarantee. Rigorous testing ensures reliable performance and compliance with industry standards.

Sufficient Stock & Fast Lead Time: Most sizes available in stock. Lead time: 5-7 days for orders below 5,000 pcs.

The alternating high- and low-profile thread design provides a strong grip, ensuring the fastener remains secure in concrete and brick substrates and stays firmly in place for the long term.

Suitable for fastening to concrete, brick, masonry, and stone substrates; widely used in curtain wall installation, architectural decoration, and civil engineering projects.

Can be used to install guardrails, air conditioner brackets, solar panel mounts, and signage, meeting the needs of various indoor and outdoor hardware mounting projects.

Our fastener factory offers OEM services based on your requirements, drawings, or samples.

Company profile

Years of Export ExperienceExperienced TeamSelf-brandedHigh Repeat Buyers Choice

Qewitco Fasteners Co., Ltd

Shandong, China

CertifiedBusiness Type: Trading Company CertifiedR&D Capacity: ODM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc.Export Year: 2003-12-05Average Response Time: ≤0.47hTerms of Payment: T/T

AI-Powered supplier vetting

SummaryThe supplier demonstrates established export experience, with 90% of sales from exports and 22 years of exporting. It has ISO9001:2015 certification, raw-material traceability, quality assurance, and 100% finished-product inspection, although inspection is performed by packing staff and only two quality inspectors are reported. Customization is broad, covering samples, designs, full customization, minor customization, and flexible customization. Service strengths include in-stock capability, stated lead times within 15 workdays in both peak and off-season, and multiple payment and quotation terms. Limitations include no overseas warehouse, showroom, agent, branch, or overseas service-country coverage, no Fortune 500 cooperation, no new products launched in the last year, one R&D engineer, no popular-brand OEM, and an undocumented corrective/preventive-action process. Financial credibility cannot be assessed because the provided financial figures are excluded from evaluation.

Supplier typeThe supplier is strongly export-oriented, reporting 90% export sales and 22 years of export experience. It can provide in-stock service and accepts FOB, CIF, CFR, and EXW terms, but reports no overseas warehouse, showroom, agent, branch, or overseas service-country coverage.

CertificationsThe supplier reports an ISO9001:2015 certificate for both sustainable development management and management systems, plus other product compliance or sustainability certifications. The specific additional certifications are not identified, so the evidence supports ISO9001 holding but not broader certification strength.

R&D capabilityThe supplier reports one R&D engineer and no new products launched during the previous year. It also reports no available SDK and no popular-brand OEM capability, which indicates limited documented innovation evidence.

Production capacityProduction-related evidence includes raw-material traceability, 100% finished-product inspection, quality assurance, four own-brand quality-control capabilities, inventory capacity, and lead times within 15 workdays in both peak and off-season. Only two quality inspectors are reported, and finished products are checked by packing staff, so production capability is positive but quality-control depth is limited.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, full customization, minor customization, and flexible customization. This is direct evidence of broad customization capability.