Flange Hex Tension Nut

Product Overview

The flange hex tension nut is a high-strength fastener specially developed for mechanical fastening, tension support and equipment tensioning structures. It adopts an integrated forging forming process, combining a hexagonal locking body and a widened bottom flange plate with precision standard internal threads. The product is quenched and tempered with black oxide finish, featuring ultra-high tensile strength, pressure resistance and anti-loosening positioning performance. It can be matched with screw rods, anchor bolts and bolts for tension fixing, widely used in heavy-load working conditions such as mine support, steel structure engineering, construction machinery and bridge prestressing. It solves the pain points of ordinary nuts including insufficient bearing area, easy slipping and weak fastening bearing capacity, serving as a special fastener for heavy-load tension systems.

Core Advantages

1. Integrated Flange Pressure Bearing DesignThe widened flange base at the bottom expands the contact bearing area to disperse fastening pressure, avoiding substrate crushing and local deformation during tightening, greatly improving overall load stability, and compatible with various mounting substrates such as soft base materials, concrete and steel plates.
2. High-strength Quenched & Tempered Black Oxide FinishMade of high-quality medium carbon alloy steel, the whole piece is forged and then quenched and tempered for high strength grade. The surface black oxide treatment isolates water vapor for mild anti-rust performance, with excellent wear and oxidation resistance to extend service life under harsh working conditions.
3. Precision Standard Internal ThreadsThreads are manufactured by CNC thread rolling with regular tooth shape and no burrs. It twists smoothly with screw rods and achieves tight engagement to prevent thread slipping. The load is evenly distributed on threads under tension to eliminate risks of thread collapse and disengagement.
4. Standard Hex Outer ProfileStandard hexagonal shape fits open-end wrenches, sockets and torque wrenches for convenient on-site disassembly and assembly. It enables accurate control of fastening torque to meet precise pressure adjustment requirements for tension construction.
5. Heavy-load Tension ResistanceThe structure is optimized for tension stress with thickened hexagonal body wall. Its tensile and shear resistance far exceeds ordinary hexagonal nuts, resisting deformation and loosening under long-term continuous stress.

Product Specification Table

Application Scenarios

1. Mine Roadway SupportMatched with finished rolled thread anchor bolts and FRP anchor bolts for tension fixing of surrounding rock in roadways. The flange base fits anchor trays to stabilize support tension and prevent roadway deformation and collapse.
2. Bridge Prestressing Tension EngineeringFasten prestressing screw rods for bridge webs and guardrails to maintain long-term stable prestress. The flange disperses tension pressure to guarantee permanent structural stability of bridges.
3. Construction Machinery Tension MechanismUsed in chain tensioning screw assemblies for excavators, conveyors and crushers to adjust and lock chain tightness, resisting loosening under heavy vibration.
4. Steel Structure Workshop ConstructionApplied for tension reinforcement joints of steel beams and supports. It replaces ordinary nuts to improve joint bearing capacity for large-span steel structure stress conditions.
5. Tunnel & Foundation Pit Support EngineeringSupport foundation pit anchor cables and advance tunnel support anchor bolts. It delivers rust and wear resistance for outdoor humid environments without tension failure over long periods.
6. Machine Frame Adjustment & FasteningInstalled on adjusting screw rods of large machine tools and stamping equipment. The flange base fits machine bases tightly to lock positioning after height adjustment.

Structural Details

This product adopts an integrated forging structure with a uniformly thickened widened circular flange plate at the bottom without welding splicing, eliminating fracture risks under force. Its flat bottom surface fully fits trays and plates to avoid local stress concentration. The hexagonal cylinder is thickened and heightened compared with conventional flange nuts to extend thread engagement length and greatly boost overall load capacity. The internal through full-thread hole is formed by thread rolling with complete and wear-resistant thread profile, compatible with long-stroke tension adjustment. Smooth chamfers are processed on hexagonal outer corners and flange transition positions to prevent scratches on tools and operators, as well as eliminate stress sharp corners to avoid cracking under load. The overall metal matrix is dense without sand holes, pores or cracks, with uniform metallographic structure after heat treatment, offering stable tensile and fatigue resistance to withstand alternating tension loads long-term.

FAQ

What is the difference between this tension nut and ordinary flange nuts?

Ordinary flange nuts are designed for static locking with thin body wall and short thread engagement section. Our tension nut is a thickened special model for tension working conditions with heightened hexagonal body and extended threads optimized for continuous tensile force. Its tensile strength and anti-slip thread capacity are increased by over 50%, specially matching anchor bolts and prestressing screw rods for tension projects.

How is the anti-rust performance of black oxide finish? Can it be used in humid outdoor environments?

Black oxide is a basic anti-rust treatment that resists daily mild water vapor and dust. For long-term open-air, high-humidity mine or coastal high-salt environments, customized hot-dip galvanized or Dacromet surface treatment versions are available with greatly upgraded anti-rust performance.

Can it match finished rolled thread bars with non-standard diameters?

Non-standard customization is supported. We can process internal threads according to the thread specifications of customer screw rods and anchor bolts, and develop new molds for special thread pitches and special-shaped threads.

What is the maximum tensile load during tension construction?

The tensile capacity depends on the specification and strength grade. The rated tension load of M20 Class 10.9 tension nut reaches 180kN, and customized Class 12.9 high-strength models deliver higher bearing capacity. Corresponding mechanical test reports can be provided.

Can anchor trays be supplied together with this product?

Yes. Our factory also produces anchor trays, finished rolled thread bars and other anchor bolt accessories. Complete sets can be packaged and shipped for one-stop purchasing of full tension support fasteners.

Contact Us for Custom Solutions

Our factory specializes in manufacturing high-strength tension nuts, mine support fasteners and prestressing matching accessories with complete in-stock specifications. We support full-dimensional non-standard customization, including special threads, enlarged flanges, heightened bodies, high-strength grades and special anti-corrosion surface treatments such as hot-dip galvanizing and Dacromet. We provide supporting services including sample delivery, mechanical performance test reports and exclusive bulk engineering quotations. Long-term preferential supply prices are negotiable for large engineering orders with flexible batch delivery available. Our professional technical team can select suitable specifications combined with customers’ tension equipment and on-site support working conditions. You only need to provide product drawings and working condition parameters to quickly obtain exclusive customized solutions and detailed quotation lists. Welcome to consult and cooperate with us at any time.