What is your inspection process for finished products?

We perform 100% inspection including visual and functional checks with traceable raw materials.

What certifications does the product have?

The product holds ISO 9001:2008, TF16949, and CE certifications.

What is the forging tolerance?

The forging tolerance is +/-0.5mm.

Mushroom Head Coal Mine Nuts Spherical Hex Nut Steel Fasten Forging Nut

Name: Mushroom Head Coal Mine Nuts Spherical Hex Nut Steel Fasten Forging Nut
Brand: Qingdao Donrex Co., Ltd.
SKU: 2057106032

Shandong, ChinaQingdao Donrex Co., Ltd.

US$1.30-3.00

1,000 kg

Sample price:US$40.00/piece.Request sample

Product profile

Customization

Available

Processing Object

Metal

Molding Style

Forging

Molding Technics

Forging

Application

Mining

Material

Steel

Heat Treatment

Normalizing

Surface Treatment

Hot Galvanized

Forging Tolerance

+/-0.5mm

Standard

ASTM

Certification

ISO 9001:2008, TF16949

Transport Package

Bag, Pallet or Plywood Box

Specification

OEM

Trademark

OEM

Origin

Shandong

Production Capacity

500000PCS/Month

Key features

Comprehensive Quality Reports: Includes chemical composition, mechanical properties, dimension, hardness, and heat treatment charts.

Advanced Forging Equipment: Equipped with 4000-5000 Ton hydraulic machines and specialized heat treatment furnaces.

Full Customization Available: Offers customization from designs, samples, full customization, and flexible minor adjustments.

100% Finished Product Inspection: Strict visual and functional inspection for all finished products with traceable raw materials.

ISO 9001 Certified: Manufacturing process certified under ISO 9001:2008 and ISO 9001:2015 standards.

Hot Galvanized Surface: Provides durable hot galvanized surface treatment for enhanced corrosion resistance.

Flexible Payment Terms: Accepts LC, T/T, D/P, PayPal, Western Union, and small-amount payments.

Experienced Manufacturer: Established in 2007 with 18 years of export experience and 7 R&D engineers.

Company profile

Full CustomizationR&D CapabilitiesODM ServicesManagement Certification

Qingdao Donrex Co., Ltd.

Shandong, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 18 Years CertifiedNearest Port: Qingdao PortAverage Response Time: ≤10.13h

AI-Powered supplier vetting

SummaryThe supplier offers broad customization, exports approximately 90% of sales, has exported for 18 years, and reports standardized finished-product inspection instructions. It holds CE and ISO9001:2015 certifications and has seven R&D engineers, but launched no new products last year and is explicitly not classified as a professional technical supplier or a provider of 3D software design. The supplier lacks stated inventory, overseas warehouse, overseas showroom, overseas agents or branches, and offline trade-show participation. Manufacturing capacity is constrained by the absence of a valid contract with related subcontractors. Customer evidence is limited: there is no cooperation with Fortune 500 companies, while repeat-buyer preference is reported at 50%–80%. Financial credibility cannot be assessed because no relevant financial information is provided.

CertificationsThe supplier reports CE product compliance certification and an ISO9001:2015 management-system certificate. These are explicit certifications supporting compliance and quality-management capability.

After-Sales capabilityThe supplier reports no overseas warehouse, overseas showroom, overseas agents or branches, and no overseas service countries. It does provide several quotation and payment options, but the stated international service infrastructure is limited.

R&D capabilityThe supplier has seven R&D engineers and offers multiple forms of customization, but it is not a professional technical supplier, does not provide 3D software design services, and launched no new products in the past year. The evidence shows customization capacity but weak recent product-innovation evidence.

Production capacityThe supplier has written and uniformly followed finished-product inspection instructions, reports one-month average lead times in both peak and off-season periods, and identifies 40 qualified suppliers for service capability. However, it has no inventory capability and no valid manufacturing-capacity contract with related subcontractors, creating an explicit production-structure deficiency.

Customization capabilityThe supplier explicitly provides customization from designs, customization from samples, full customization, minor customization, and flexible customization. This is direct evidence of a broad range of customization services.