DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel

DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel is fully manufactured in strict accordance with German DIN6334 industrial standard, covering complete dimensional tolerances, thread specifications and mechanical property requirements. This long hex connecting nut, also widely named threaded rod extension nut or hex coupling nut in global procurement market, is designed specially for connecting and extending full-thread studs, threaded rods and anchor bolts. The through full internal thread enables seamless assembly of two threaded bars without extra cutting, tapping or secondary machining work on site. Ningbo Gangtong Zheli Fasteners Co., Ltd produces complete size range covering M6 to M24, and custom non-standard lengths with special thread pitches are available to meet diversified engineering fastening requirements from all over the world.

Material & Surface Treatment

DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel selects premium low-carbon steel (C1008/C1010) as the base raw material for standard zinc plated version, and A2-70, A4-80 stainless steel can be selected as alternative material for high corrosion heavy environment. All raw materials will go through strict incoming laboratory inspection before mass production, including spectrometer composition analysis, hardness test and metallographic examination, to guarantee stable tensile strength and uniform internal metal grain structure. The eco-friendly trivalent electro-galvanizing (Cr3+) treatment fully complies with RoHS and REACH environmental regulations, forming compact and uniform zinc protective layer with 8-12 micron thickness to resist rust and oxidation under normal atmospheric and mildly humid conditions. Multiple optional surface treatments include yellow zinc plating, hot dipped galvanizing, black oxide, dacromet and nickel plating to adapt various complex working environments.

Structural Features & Performance Advantages

DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel adopts full-length penetrating internal thread and standard hexagonal outer profile, ensuring consistent dimensions from first piece to mass production. The regular hexagonal outer shape allows stable clamping and convenient tightening with standard hex wrench or socket set without slipping during installation. The extended nut body provides 3 to 5 times thread diameter length, achieving much longer thread engagement than standard hex nuts. Longer meshing area greatly improves connection stability and effectively reduces loosening risk under continuous vibration, impact load and alternating mechanical loads. All internal threads are precision machined by high-speed CNC tapping equipment and inspected by go/no-go gauges to meet DIN standard tolerance grade 6H, ensuring smooth thread fit and consistent fastening performance for every batch. Both end faces are chamfered to guide bolt entry easily, avoiding thread damage during quick assembly.

Application Scenarios

DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel has wide application value in multiple industrial fields and engineering projects. This coupling nut is commonly used for solar photovoltaic support system assembly, steel structure bracing connection, highway guardrail installation, heavy mechanical equipment assembly, industrial fixture and jig manufacturing, plumbing and pipe hanger systems, construction formwork bracing and shipbuilding interior fastening. This long hex nut is the preferred fastener for all engineering projects that need threaded rod extension, adjustable connection length and reliable high-load bolt joint. The long body design makes it especially suitable for suspended ceiling systems, seismic bracing systems and structural tie rod assemblies where threaded bars must be extended or fine-tuned during on-site installation.

Quality Assurance & Inspection

Ningbo Gangtong Zheli Fasteners Co., Ltd carries out multi-stage standardized inspection for DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel before shipment, covering raw material incoming, in-process sampling and final outgoing check. This coupling nut will pass dimension tolerance checking, thread accuracy inspection by go/no-go gauges, hardness test and tensile strength test one by one according to AQL 1.0 inspection standard. MTC material test certificate, dimensional inspection report, mechanical performance report, salt spray test report and factory COA certificate can be provided for each batch. All documents support customer on-site audit and third-party verification (SGS, BV, TUV), satisfying strict quality requirements of global industrial purchasers, engineering contractors and EPC project owners.

Packaging & Shipment

DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel adopts standardized export packaging process for safe overseas delivery. This coupling nut is firstly packed with inner waterproof and moisture-proof plastic bags to avoid surface scratch, oxidation and moisture damage in transit. Products are then put into thickened double-layer export cartons with clear specification labels printed on each box. Cartons will be stacked on fumigated wooden pallets, wrapped by transparent stretch film and fixed with plastic strapping bands in horizontal and vertical directions, to prevent cargo shifting and collision damage during long-distance sea or air shipment. Custom printed shipping marks, brand logo, barcode labels and retail small box packing can be offered according to buyer’s personalized requirements. MOQ is flexible for trial order, and mixed sizes in one container are acceptable.

Why Choose Gangtong Zheli

DIN6334 Hex Coupling Nut Zinc Plated Carbon Steel is produced by Ningbo Gangtong Zheli Fasteners Co., Ltd, a professional fastener manufacturer located in Ningbo, China, the most important fastener export base in Asia. This coupling nut has been exported to more than 30 countries including Germany, Italy, Spain, USA, Australia, Brazil and Middle East markets, earning long-term trust from distributors, engineering contractors and industrial brand owners. We own advanced cold forging machines, CNC tapping equipment and full set of testing instruments, enabling stable quality and competitive factory-direct pricing. Custom dimensions, special materials and private label packaging are warmly welcomed. Fast quotation within 24 hours, flexible MOQ for trial orders and reliable after-sales service are always provided to every customer.

FAQ

Q1: What is DIN6334 used for?

DIN6334 hex coupling nut is mainly used to connect and extend two threaded rods or studs. The long internal thread body allows adjustable length connection, widely used in solar mounting, steel structure bracing, guardrail, pipe hanging and machinery assembly.

Q2: What materials are available for DIN6334 coupling nut?

Standard version uses carbon steel with zinc plated finish. We also supply A2-70 and A4-80 stainless steel versions for corrosive environments. Special materials and non-standard lengths can be customized on request.

Q3: How to choose between zinc plated and hot dipped galvanized?

For general indoor and normal outdoor projects, trivalent zinc plated (Cr3+) is enough and more cost effective. For coastal, high humidity or heavy anti-corrosion engineering, hot dipped galvanized with 500+ hours salt spray resistance is recommended.

Q4: What is the lead time for DIN6334 coupling nut orders?

Standard sizes in stock can ship within 7 days. Mass production order lead time is around 25-35 days depending on quantity and surface treatment. Trial order with small quantity is always welcome.

Q5: Can you provide material certificate and inspection report?

Yes. MTC material certificate, COA, dimensional report and salt spray test report are available for every batch. Third party inspection by SGS, BV or TUV can also be arranged before shipment.