What is the warranty or guarantee?

The product features advanced grease pressure control systems and sealed bearings to ensure durability and performance in hard rock formations.

What are the recommended drilling parameters?

Parameters vary by IADC code. For example, IADC 637 requires 0.5-1.2 kn/mm WOB and 80-40 RPM for hard to very hard formations.

8.5)

Name: 8 1/2" Hard Rock Core Barrel Roller Cone Bits (52/8.5)
Brand: Hejian Longyue Drill Bit Manufacture Co., Ltd.
SKU: 2176907785

Hebei, ChinaHejian Longyue Drill Bit Manufacture Co., Ltd.

US$210.00-250.00

1 Piece

Sample price:US$800.00/piece.Request sample

Product profile

Customization

Available

Customized

Standard

AISI

Model NO.

8.5

Type

Center Drill Bit

Material

High Carbon Steel

Usage

Well Drilling

Machine Type

Drilling Tool

Processing Type

Forging

Advantage

High-Efficiency ,Wear Resistant

Bearing Type

Journal /Roller Bearing Bit

Transport Package

Wooden Case

Specification

12 1/4"

Trademark

LONGYUE

Origin

Hebei, China

HS Code

8207199000

Production Capacity

200 Pieces/Week

Key features

Wide IADC Code Range: Supports IADC codes 117, 127, 126, 217, 417, 437, 517, 537, 617, 627, 637, 737.

High Wear Resistance: Features tungsten carbide inserts and hardfaced thrust faces with wear-resistant alloy.

Advanced Bearing System: Equipped with metal sealed and rubber sealed bearings with advanced grease pressure control.

Customizable Center Nozzle: The center nozzle can be customized to meet specific drilling requirements.

Enhanced Gauge Protection: More carbide inserts on the shirttail increase gauge holding capability and bearing life.

High-Efficiency Design: Forged high carbon steel construction ensures high efficiency and wear resistance.

Stock Availability: Regular models are available in stock for prompt delivery and fast lead times.

Global Export Experience: Exported to over 25 countries including USA, Australia, and various European nations.

Company profile

Hejian Longyue Drill Bit Manufacture Co., Ltd.

Hebei, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service AvailableExport Year: 2016-08-01 CertifiedNearest Port: Tianjin PortAverage Response Time: ≤5.95h CertifiedTerms of Payment: LC, T/T, D/P, etc.

AI-Powered supplier vetting

SummaryHejian Longyue Drill Bit Manufacture Co., Ltd. is a China-based manufacturing factory in Hejian, Cangzhou, Hebei, established in 2016, with 67 employees and a 10,000 m² plant. It produces drilling-related equipment, operates more than 10 production lines, and has 6–10 quality-control staff. The supplier states that it can design HY PDC bits according to customer requirements, indicating customization capability. It has five years of R&D engineer experience, exports 51%–70% of sales, and holds self-operated import and export rights. However, the provided information does not confirm certifications, after-sales capabilities, or verified customer cases. Trade records show limited documented import activity involving Uzbekistan and Kazakhstan, but these records alone do not establish broad customer performance or financial credibility.

Supplier typeThe supplier is explicitly identified as a factory/manufacturer and a limited company located in Hejian, Cangzhou, Hebei, China. Its stated business scope includes drilling equipment and manufacturing-related products, consistent with a specialized industrial manufacturer.

R&D capabilityThe supplier reports five years of total R&D engineer experience and states that it can design HY PDC bits according to customer requests. This provides explicit evidence of product-design capability, although no broader R&D team size, patents, testing facilities, or innovation results are given.

Production capacityThe supplier operates more than 10 production lines, employs 6–10 quality-control staff, and has a 10,000 m² manufacturing plant with 67 total employees. These stated operational resources support a positive assessment of production capability, though actual capacity and delivery performance are not specified.

Customization capabilityThe company explicitly states that it can design HY PDC bits according to customer requirements. Its listed product range includes PDC bits, tricone bits, roller cones, hole openers, rock reamers, and related drilling products, supporting product-specific customization capability.

Product Q&A

Q:How to get an exact quotation?

Please send detailed information including bit type (Tricone/PDC/Hole opener), diameter, IADC code, rock hardness, drilling depth, rig capacity, and Incoterms. Photos are also helpful.

Q:What is the lead time and payment terms?

Regular models are in stock for prompt delivery. Mass production depends on order quantity. We accept L/C, T/T, D/P, and PayPal.

Q:What are the available bit sizes?

Available sizes include 7 1/2'', 8 1/2'', 9 7/8'', and 12 1/4''. The 8 1/2'' is a standard size for this product line.

Q:What materials are used for the drill bits?

The bits are made of High Carbon Steel with tungsten carbide inserts and inlaid friction-reducing alloy. Bearings are metal or rubber sealed.

Q:Can the center nozzle be customized?

Yes, the center nozzle can be customized according to specific drilling needs and parameters.