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Our DIN 6334 Hex Coupling Nuts (also known as hex connector nuts or long hex nuts) are designed to join and extend threaded rods and studs of the same specification through opposite ends. The elongated body provides a long internal thread engagement area in the common 3d length, while carbon steel, alloy steel and 304/316 stainless steel with zinc or zinc flake finishes offer material and coating choices. These fasteners are ideal for equipment installation, fixture assemblies, rod extensions and support structures, with custom dimensions evaluated from drawings.
Haosheng Fasteners supplies DIN 6334 hex coupling nuts, also known as hex connector nuts, long hex nuts or threaded rod connector nuts. An extended hexagonal body with an internal thread joins two threaded rods or studs of the same specification through opposite ends, while the hex exterior allows tightening with standard wrenches and sockets. Market-standard products follow an approximate 3d length, with a common M12 nut measuring 36 mm and an M16 nut 48 mm, serving equipment installation, fixture assemblies, threaded rod extensions and support structures. DIN 6334 is a widely used commercial product designation, not a formally published DIN standard, so dimensions, materials, mechanical properties and acceptance requirements are specified in the agreed drawing and purchase order.
Carbon steel in 20, 35 and 45 grades, alloy steel in 40Cr and 35CrMo, and stainless steel in 304 and 316 can be evaluated according to application and mechanical requirements. Plain, blue zinc, yellow zinc, zinc-nickel and zinc flake finishes are selected for the operating environment, with cleaning or passivation available for stainless steel. Through-threaded, center-stop and other internal structures, metric sizes M6-M36, special lengths, widths across flats, fine threads, left-hand and right-hand combinations and different thread sizes at opposite ends are all confirmed against the order. We support international fastener distributors, equipment manufacturers and industrial procurement teams with both standard and drawing-based supply.
| Product Name | Hex Coupling Nuts | Common Designation | DIN 6334 (commercial) |
|---|---|---|---|
| Design | Extended Hexagonal Body | Thread Sizes | M6-M36 & Specified Sizes |
| Common Length | Approx. 3d (M12: 36 mm / M16: 48 mm) | Internal Structure | Through-Threaded / Center-Stop / Specified |
| Material | Carbon / Alloy / Stainless Steel | Material Options | 20, 35, 45 Steel; 40Cr, 35CrMo; 304, 316 |
| Surface Finishes | Plain / Blue Zinc / Yellow Zinc / Zinc-Nickel / Zinc Flake | Samples | Available upon request |
Technical note: DIN 6334 is a commonly used commercial product designation and should not be treated as a formal DIN standard compliance declaration. Mechanical properties must be specified separately according to applicable standards and agreed technical requirements. Material grades and finished-product property classes are different specifications, so the performance of the finished coupling nut should be confirmed by inspection rather than inferred from the raw material designation. Metric M thread, custom lengths, widths across flats, packaging in bulk or cartons, and acceptance criteria are confirmed in the drawing and purchase order before production.
The elongated 3d body provides a long internal thread engagement area to join two rods or studs end to end for extensions, fixtures and support structures.
Standard wrenches and sockets tighten and remove the nut easily, simplifying installation, maintenance and replacement in conventional assemblies.
Carbon steel suits general fastening, alloy steel covers higher property requirements, and 304 or 316 stainless serves corrosion-resistant applications, all confirmed per order.
Metric sizes M6-M36 follow the 3d length series; special lengths, fine threads and differing end threads are evaluated against customer drawings.
Blue or yellow zinc, zinc-nickel and zinc flake coatings are selected with internal thread fit, coating thickness and mating rods in mind.
Center-stop, left and right-hand combinations, different widths across flats and different end threads are confirmed by technical drawings before production.
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Carbon, alloy and stainless steel grades and inspection requirements are confirmed against dimensions and specified mechanical properties before production.
Width across flats, overall length and end geometry are controlled so the hex body matches the intended assembly and wrench access.
Internal threads are processed to the specified diameter, pitch and tolerance, with checks on thread quality and engagement with mating rods.
For steel products with specified property requirements, manufacturing and inspection follow the agreed specification rather than the raw material designation.
Zinc plating, zinc-nickel and zinc flake coatings are applied against order requirements, considering internal thread fit and coating thickness.
Thread, dimensions, finish and agreed property requirements are checked before bulk packing, cartons or other agreed packaging options.
| Comparison Feature | Standard Fasteners | Haosheng Coupling Nuts |
|---|---|---|
| Length Configuration | Fixed 3d length only | 3d plus special lengths from drawings |
| Material Confirmation | Assumed from the designation | 20/35/45, 40Cr/35CrMo, 304/316 per order |
| Standard Basis | DIN 6334 treated as compliance | Commercial designation; drawing and PO rule |
| Internal Structure | Through-thread only | Through-threaded, center-stop, specified designs |
| Special Configurations | Not offered | Fine threads, left/right-hand, different end threads |
Selection note: DIN 6334 is a commercial designation rather than a formal standard compliance claim. No grade marking or torque figure can be assumed from the designation alone, and the two rod ends should engage roughly equally in each half of the nut. Confirm thread engagement, dimensions, material and acceptance criteria against the actual assembly design before ordering.
An elongated hex body with a long internal thread joins two rods end to end. A standard hex nut clamps a joint against a surface and cannot extend a threaded rod.
No. It is a widely used commercial designation. Dimensions, materials, mechanical properties and acceptance requirements must be specified in the agreed drawing and purchase order.
Metric M6-M36 and other specified sizes. Common products follow an approximate 3d length, so M12 is typically 36 mm and M16 48 mm; special lengths are evaluated from drawings.
Material grades and finished-product property classes are different specifications. State the required mechanical properties in the order; finished-nut performance is confirmed by inspection.
Yes. Through-threaded, center-stop, fine thread, left and right-hand combinations and different thread sizes at opposite ends can be evaluated, subject to a confirmed drawing.
Plain, blue zinc, yellow zinc, zinc-nickel and zinc flake finishes, plus cleaning or passivation for stainless steel. ISO 9001, ISO 14001 and ISO 45001 certified production; samples on request.
Please include thread size, overall length, width across flats, internal structure, material, surface finish and order quantity.
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