TNHO Large Washer Nuts for High Voltage Electrical Equipment
These large washer nuts are produced by cold heading and cold forging, featuring high strength, stable thread and long service...
This series covers precision inserts and terminal accessories dedicated to high and low voltage electrical equipment, including US thread copper inserts, aluminum terminal heads, and brass 5-hole mounting discs. Made of pure copper, brass and aluminum via integrated forging, they feature precise UNC internal threads with tight thread engagement. Boasting excellent electrical conductivity, vibration resistance and anti-loosening performance, they are widely used in watt-hour meters, distribution boxes and switchgears for wiring fixation and assembly. Standard sizes are in stock, and non-custom specifications are available. They resist corrosion and avoid heating or loosening under long-term power-on operation, perfectly meeting strict application requirements of power equipment.
| Item | Specifications |
|---|---|
| Product Types | US thread copper inserts, aluminum terminal heads, brass 5-hole mounting discs |
| Materials | Pure red copper, H62 brass, aluminum alloy |
| Thread Standard | US unified thread; standard size 10×25, metric non-standard customization acceptable |
| Manufacturing Process | Hot forging + CNC precision turning + high-precision tapping |
| Surface Treatment | Raw metal finish, optional anti-rust passivation |
| Structure Types | Hexagonal limited internal thread, round aluminum terminal, 5-hole disc base |
| Application Scenarios | High/low voltage distribution boxes, smart meters, power switches, distribution terminals |
| Quality Tests | Thread go/no-go gauge test, conductivity test, vibration fatigue test |
| Custom Service | Customizable dimension, thread, material & shape per drawings with sampling available |
1. Diversified material options cater to various power working conditions: red copper ensures superb conductivity for heavy current transmission; brass resists deformation and abrasion for frequent assembly; lightweight aluminum with rust resistance fits outdoor low-load power equipment.
2.Precisely machined US internal threads deliver stable fastening durability: threads are tapped with high accuracy and uniform pitch, effectively preventing thread stripping after repeated screwing and maintaining consistent tightening force.
3.Integrally forged construction brings solid structural strength: seamless integrated forming ensures even internal stress distribution, avoiding cracking and deformation caused by heat generation and long-term equipment vibration.
4.Multiple profile designs satisfy diverse assembly demands: hexagonal inserts support convenient wrench tightening and positioning; round aluminum terminals fit wiring in narrow cavities; 5-hole discs enable stable large-area mounting on equipment bottom plates.
5.Optional power-grade anti-rust passivation adapts harsh environments: passivation treatment effectively prevents oxidation and rust under humid outdoor weather and drastic temperature changes, sustaining stable electrical conductivity all year round.
Developed exclusively for the power industry to match meter and distribution box assembly habits
Dimensions align perfectly with reserved openings of global high/low voltage electrical devices for direct installation without secondary modification.
Superior electrical conductivity lowers heat loss during continuous operation
Copper and brass substrates feature low resistivity to cut current transmission loss, reduce temperature rise under full load and eliminate hidden dangers of overheating.
Strict thread tolerance guarantees strong interchangeability for mass production
Manufactured per US thread tolerance standards, identical parts are interchangeable freely to raise workshop assembly efficiency and reduce error rates.
Anti-vibration & anti-loosening design adapts long-term outdoor operation
Combined step limiting structure and fine threads prevent loosening triggered by outdoor wind shock or transportation vibration to avoid wiring faults.
Ample stock plus flexible non-standard customization for fast delivery
Mainstream standard sizes are always in stock for immediate shipment; drawing samples can be finished within 3–5 days with controllable lead time for bulk orders.
Full-range factory inspection ensures stable quality for export trade
Every batch is sampled for thread, conductivity and voltage resistance tests, complying with European and American power hardware access standards suitable for cross-border electrical supply.
