DIN6334 Hex Coupling Nut Specifications
Parameter | Details |
Product Name | DIN6334 Long Hex Coupling Nut / Extension Connecting Nut |
Standard | DIN6334 German Industrial Standard |
Strength Grade | Carbon Steel: 4.8/8.8/10.9; Stainless Steel: A2-70(304), A4-80(316) |
Structure | 3×D Length Design, Full Through Internal Thread, Double-end Connection |
Thread Tolerance | 6H Precision Metric Coarse Thread, High Compatibility |
Surface Finish | Zinc Plated, Black Oxide, HDG, Dacromet, Stainless Steel Polish |
Size Range | M3-M36 Full Sizes In Stock, Custom Extended Length Available |
Application | Threaded Rod Extension, Ceiling Suspension, PV Bracket, Steel Structure, Mold Tie Rod, Pipeline Support |
Certification | ISO9001, Material Test Report, Hardness Test, Salt Spray Report, Batch Quality Certificate |
Package | Standard Export Carton & Pallet, Custom Neutral Packaging |
Delivery Time | 3-7 days for stock items, 15-25 days for bulk & customized orders |
DIN6334 Coupling Nut Features & Advantages
Extended Thread Design for Higher Tensile Strength
With 3 times diameter extended body and full through threads on both ends, DIN6334 coupling nut provides far larger thread engagement area than standard short nuts. It effectively prevents thread slipping and fracture under tension and vibration, ensuring stable and firm connection for rod extension and long-distance fastening scenarios.
Full Grade Coverage for All Working Conditions
Covers economical Grade 4.8, industrial high-strength Grade 8.8/10.9 and anti-corrosion 304/316 stainless steel series. Perfectly adapted to light-duty indoor, heavy-duty outdoor, mechanical engineering and corrosive environment applications, realizing one product for all scenarios.
Multiple Anti-corrosion Finishes
Electro-galvanized finish offers cost-effective basic rust resistance. HDG and Dacromet finishes provide superior weather resistance and salt spray performance for long-term outdoor use. Stainless steel versions eliminate coating peeling problems, ideal for harsh corrosive working conditions.
Standard & Easy Installation
Standard hex shape fits all common wrenches and sleeve tools. 6H standard thread ensures perfect compatibility with DIN975 threaded rods and standard bolts. Flexible length adjustment reduces on-site cutting loss and construction cost.
Grade 4.8 Zinc Plated Coupling Nut (Economical Hot Sale)
Made of high-quality Q235 low-carbon steel through cold heading forming, featuring good toughness, high precision and ultra-high cost performance. The blue and white electro-galvanized surface is smooth and bright with reliable basic rust resistance. Ideal for dry and light-duty working environments such as ceiling suspenders, light-duty equipment frames, ordinary mechanical assembly and indoor pipeline support. It is the mainstream bulk model for small-batch foreign trade procurement and general domestic engineering projects.
Grade 8.8 High-strength Extension Nut (Industrial Universal Type)
Adopting 40Cr alloy steel with quenching and tempering heat treatment, it balances hardness and toughness with excellent tensile resistance, fatigue resistance and impact resistance. Optional surface finishes include electro-galvanized, hot-dip galvanized and Dacromet. Widely used for photovoltaic brackets, warehouse steel structures, agricultural machinery equipment and outdoor frame assembly with medium-heavy load and semi-outdoor working conditions, featuring high inquiry volume and repurchase rate.
Grade 10.9 Super High-strength Coupling Nut (Heavy-duty Engineering Type)
Manufactured from premium 42CrMo alloy steel with high-temperature tempering strengthening, it owns extreme mechanical strength, far superior bearing capacity and deformation resistance than ordinary grades. Matched with Dacromet long-term anti-corrosion coating, it resists vibration, heavy load and aging, specially designed for strict heavy-duty scenarios such as heavy steel structures, large equipment tie rods, construction machinery and high-end tooling fixtures.
304 Stainless Steel Coupling Nut A2-70 (General Anti-corrosion Type)
Made of authentic 304 stainless steel with excellent rust and oxidation resistance, non-magnetic performance and stable toughness. It adapts to humid environments, rainwater erosion and mild corrosive conditions, widely applied in ordinary outdoor projects, water treatment equipment, garden facilities and damp workshop equipment assembly, balancing superior quality and competitive cost.
316 Stainless Steel Coupling Nut A4-80 (High-end Anti-corrosion Type)
Adopting molybdenum-containing 316 stainless steel, its acid resistance, alkali resistance and salt spray corrosion resistance are greatly improved compared with 304 stainless steel. It can adapt to extreme working conditions such as coastal salt spray, chemical corrosion and high temperature and humidity. With high mechanical strength, wear resistance and aging resistance, it is widely used in marine equipment, chemical machinery, high-end outdoor projects and precision anti-corrosion equipment supporting.
Production Process
Graded Material Selection: Classify and select raw materials according to carbon steel, alloy steel and stainless steel grades, strictly control material composition, and stabilize mechanical properties of different grade products from the source.
Precision Cold Heading Forming: Integrated automatic cold heading forming with regular hexagon shape, flat end surface, no burrs and no deformation, ensuring high product concentricity.
High-precision Tapping Processing: Precision through tapping at both ends with full thread profile, standard tolerance and smooth meshing without jamming.
Graded Heat Treatment Strengthening: Exclusive tempering process for Grade 8.8/10.9 alloy steel to stabilize hardness and tensile strength, avoiding thread slipping, fracture and deformation.
Custom Anti-corrosion Treatment: Complete electro-galvanizing, hot-dip galvanizing, Dacromet, stainless steel polishing and other processes on demand to meet different rust prevention requirements.
Full-batch Quality Inspection: Test dimension, thread precision, hardness and salt spray performance batch by batch, conduct graded sorting and strict quality control, and provide complete factory qualification certificates.
Application Industries
Building Ceiling Engineering: Extended connection and fixing of light steel keel ceiling, air duct suspenders and building tie rods.
New Energy Photovoltaic Engineering: Adjustable extension assembly of photovoltaic bracket tie rods and outdoor steel structures (HDG/Dacromet type preferred).
General Mechanical Equipment: Extension connection of automatic frames, tooling fixtures, mold tie rods and equipment threaded rods.
Pipeline & Municipal Engineering: Fastening connection of pipeline supports, municipal facilities and steel structure bracings.
High-end Anti-corrosion Equipment: Corrosion-resistant extended connection supporting for water treatment, coastal, chemical and marine equipment (304/316 stainless steel type).
Why Choose Our DIN6334 Coupling Nuts
We have focused on the production of DIN standard extended coupling fasteners for many years, covering full carbon steel grades of 4.8/8.8/10.9 and complete 304/316 stainless steel series DIN6334 long nuts, meeting full-scenario procurement demands from light-duty civil use, heavy-duty engineering to high-end anti-corrosion projects. All products are manufactured strictly in accordance with German standards with precise threads, high concentricity and stable bearing capacity. We have sufficient stock inventory and support non-standard customization and special process processing. Complete material, mechanical and salt spray test reports are available, providing cost-effective one-stop threaded rod extension fastening solutions for global customers.
If you are looking for high-quality DIN6334 hex coupling nuts, including Grade 4.8/8.8/10.9 zinc plated long nuts and stainless steel extension nuts, feel free to contact us for professional technical support and accurate quotation.
