What is the welding method for the drill bits?

Outer diameters less than or equal to 18mm use silver soldering, while those 20mm and above use laser welding.

Are samples available for testing?

Yes, we accept sample orders to allow customers to test the product quality before bulk purchase.

1-3/8inch 35mm Diamond Dry Stone Hard Rock Granite Core Drilling Bits

Name: 1-3/8inch 35mm Diamond Dry Stone Hard Rock Granite Core Drilling Bits
Brand: Johnson Tools Manufactory Co., Ltd.
SKU: 1906772372

Jiangsu, ChinaJohnson Tools Manufactory Co., Ltd.

US$10.70-16.50

20 Pieces

Product profile

Customized

Standard

SGS

Type

Core Drill Bit

Material

Diamond

Usage

Concrete Drilling

Product Name

Diamond Core Drill Bits

Manufacturing Arts

Laser Welded

Outer Diameter

35mm

Working Length

55mm

Thread

M14 or 5/8"-11

Application

Stone Drilling

Total Length

105mm

Finish

Plain

Transport Package

Carton

Specification

Trademark

Johnson Tools

Origin

China

HS Code

8207501000

Production Capacity

1000PCS/Month

Key features

SGS & MPA Certified: Products hold SGS and MPA certificates ensuring quality and safety standards.

Laser Welded Construction: Segments are laser welded for durability, with smaller diameters using silver soldering.

Extended Service Life: Features brazing rods (4 outside, 2 inside) to protect the steel disc and extend life.

Versatile Application: Suitable for drilling granite, stone, concrete, asphalt, brick, and pavement.

Flexible Customization: Offers full customization, minor customization, and flexible options for designs and samples.

Fast Response Time: Provides one-day reply to inquiries and questions for efficient communication.

Global Export Experience: Exported to over 70 countries with rich production experience since 2000.

Company profile

Years of Export ExperiencePatents AwardedFast DeliveryOEM Services

Johnson Tools Manufactory Co., Ltd.

Jiangsu, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 17 Years CertifiedNearest Port: Shanghai Port, Ningbo, QingdaoAverage Response Time: ≤3.39h

AI-Powered supplier vetting

SummaryThe supplier provides OEM and ODM services and supports extensive customization, including sample-, design-, full-, minor-, and flexible customization. It has 17 years of export experience, self-managed import/export rights, 90% export sales, and accepts multiple trade and payment terms. Production is conducted on one line, supported by 11–20 quality-control staff and stated advanced equipment and checking systems. However, no management-system certifications, SDK, new products in the past year, overseas service facilities, or offline trade-show participation are reported. Service procedures and complaint handling lack written records, and production batches are not continuously reconciled. Financial and cash-flow evidence is limited to year labels, so financial credibility cannot be conclusively assessed.

Supplier typeThe supplier is an OEM/ODM manufacturer with its own factory location, one production line, stated production output, advanced equipment, and a technical workforce. It also provides export services directly through self-managed import/export rights, indicating a manufacturing-oriented supplier rather than a pure trading intermediary.

CertificationsThe supplier’s certification of management systems is explicitly listed as NIL. This is a stated absence of certification evidence and represents a deficiency for this field.

After-Sales capabilityThe supplier has a complaint-handling procedure, but no written records, and it lacks written service-assessment and corrective/preventive-action procedures or records. It also reports no overseas warehouses, showrooms, agents, branches, or offline trade-show participation, limiting documented overseas service support.

R&D capabilityThe supplier provides ODM and broad design customization, but reports no available SDK and no new products during the past year. These explicit limitations outweigh the design-service evidence when assessing demonstrated recent innovation capability.

Production capacityThe supplier reports one production line, 11–20 quality-control staff, advanced production and checking equipment, and flexible export fulfillment with one-month lead times in both peak and off-season. However, it does not continuously reconcile quantities for each batch or mass production, so production controls are not fully documented.

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