Termate’s AU6 standoff insulators represent the heavy-duty end of the imperial range, engineered for switchgear, traction, and energy storage systems where strength, insulation, and fire performance are critical.
With heights from 2 ⅜″ to 4″ and thread sizes up to ⅝″–11 UNC, AU6 provides exceptional tensile and cantilever resistance while maintaining electrical integrity up to 1500 V DC.
Manufactured from UL 94 V-0 rated, glass-reinforced polyamide 6.6, AU6 combines durability, precision, and reliability in mission-critical installations that demand maximum safety and mechanical stability.
Key Features
Technical Information for AU6 Imperial Range Standoff Insulators
You will find useful technical information below but, if you have any questions, please contact our technical team for support.
The below table shows the AU6 range of Termate standoff insulators.
The complete AU6 range is suitable for applications with an AC Equipment Voltage Ue up to 1000 V or DC Equipment Voltage Ue up to 1500 V.
The technical data provided in the table below provides information necessary for product selection and technical assessment in line with IEC and UL product standards.
We hold excellent stock of all of our products and will be happy to provide you a quotation for your requirements, please use our contact us page or email our customer support team.
| Part number | 3D Model | Description | Height [H] † | Thread Size [M]* | Thread Depth [D] | Maximum Tightening Torque (lb·ft) | Tensile Strength** (lb) | Cantilever Strength** (lb) | Box Qty. |
|---|---|---|---|---|---|---|---|---|---|
| AU6-060-516 | AU6-060-516 STEP file | 2.375″ high Standoff Insulator with 5/16UNC thread | 2-3/8″ | ⁵⁄₁₆″—18 UNC | ⅜″ | 17 | 3300 | 1500 | 20 |
| AU6-060-038 | AU6-060-038 STEP file | 2.375″ high Standoff Insulator with 3/8UNC thread | 2-3/8″ | ⅜″—16 UNC | ⅝″ | 32 | 4400 | 2300 | 20 |
| AU6-060-012 | AU6-060-012 STEP file | 2.375″ high Standoff Insulator with 1/2UNC thread | 2-3/8″ | ½″—13 UNC | ⅝″ | 56 | 5400 | 3100 | 20 |
| AU6-060-058 | AU6-060-058 STEP file | 2.375″ high Standoff Insulator with 5/8UNC thread | 2-3/8″ | ⅝″—11 UNC | ⅞″ | 77 | 7500 | 4400 | 20 |
| AU6-070-516 | AU6-070-516 STEP file | 2.75″ high Standoff Insulator with 5/16UNC thread | 2-3/4″ | ⁵⁄₁₆″—18 UNC | ⅜″ | 17 | 3000 | 1400 | 20 |
| AU6-070-038 | AU6-070-038 STEP file | 2.75″ high Standoff Insulator with 3/8UNC thread | 2-3/4″ | ⅜″—16 UNC | ⅝″ | 32 | 4200 | 2000 | 20 |
| AU6-070-012 | AU6-070-012 STEP file | 2.75″ high Standoff Insulator with 1/2UNC thread | 2-3/4″ | ½″—13 UNC | ⅝″ | 56 | 5100 | 2700 | 20 |
| AU6-070-058 | AU6-070-058 STEP file | 2.75″ high Standoff Insulator with 5/8UNC thread | 2-3/4″ | ⅝″—11 UNC | ⅞″ | 77 | 5700 | 3800 | 20 |
| AU6-100-516 | AU6-100-516 STEP file | 4″ high Standoff Insulator with 5/16UNC thread | 4″ | ⁵⁄₁₆″—18 UNC | ⅜″ | 17 | 2400 | 1000 | 10 |
| AU6-100-038 | AU6-100-038 STEP file | 4″ high Standoff Insulator with 3/8UNC thread | 4″ | ⅜″—16 UNC | ⅝″ | 32 | 3700 | 1300 | 10 |
| AU6-100-012 | AU6-100-012 STEP file | 4″ high Standoff Insulator with 1/2UNC thread | 4″ | ½″—13 UNC | ⅝″ | 56 | 4000 | 1600 | 10 |
| AU6-100-058 | AU6-100-058 STEP file | 4″ high Standoff Insulator with 5/8UNC thread | 4″ | ⅝″—11 UNC | ⅞″ | 77 | 6300 | 2200 | 10 |
† Imperial height is approximate, products are manufactured to metric dimensions. (2” = 50mm)
* Fixing details: Hole diameter = Standoff thread size [M]+¹⁄₁₆″
** Tensile and Cantilever Strength figures are based on tests carried out at normal room temperature, nominal 73.4 °F
| Recognition | Reference / Link | Preferred name |
|---|---|---|
| UL Recognised Component | File Number: E505645 | |
| EClass 8.0 | 27-08-10-08 | Insulator, plastic |
| EClass 14.0 | 27-08-10-03 | Bus bar holder (insulator, post insulator) |
| Properties | Value / Measure / Unit |
|---|---|
| Insulator Material | Glass Reinforced Polyamide 6.6 (PA66) |
| Insert Material | Brass |
| Operating Range in Fahrenheit | This material operates in a wide temperature range: −40 °F to +266 °F |
| Operating Range in Celsius | This material operates in a wide temperature range: −40 °C to +130 °C |
| Flammability | UL 94 V-0 |
| Oxygen Index | 32% |
| Glow Wire | 960 °C |
| Characteristics | Value |
|---|---|
| Maximum Alternating Current Equipment Voltage, Ue | 1000 V |
| Maximum Direct Current Equipment Voltage, Ue | 1500 V |
| Impulse Voltage, Uimp | 12 kV |
The following table provides additional UL Yellow Card information, for the material used in AU6 standoff insulator range, required for assessing the suitability for incorporation into electrical equipment built to North American standards or for use when evaluating unlisted equipment for compliance with North American recognised standards, using methods such as NFPA 791.
| Properties | Value | Test Method |
|---|---|---|
| Hot-wire Ignition (HWI) | PLC 0 | UL 746A |
| High Amp Arc Ignition (HAI) | PLC 1 | UL 746A |
| Comparative Tracking Index (CTI) | PLC 0 | UL 746A |
| UV Exposure & Water Immersion | f1 | UL 746C |
Termate’s AU6 standoff insulator range provides excellent electrical insulation and mechanical strength for a variety of applications. Standoff insulators can also be referred to as post insulators, egg insulators, bobbin insulators, or busbar isolators.
This standoff insulator range is available in heights from 2⅜ inch to 4 inch and insert sizes of ⁵⁄₁₆″—18 to ⅝″—11 UNC. Technical data is found on the table above which displays heights, thread size and depth, maximum tightening torques, tensile and cantilever strengths, and box quantities available.
Please note that while we have referenced imperial (inch) dimensions, the height and width of the range is identical to the metric sizes. The .STEP files attached are the correct dimensions.
- Made from UL 94 V-0 rated, self-extinguishing material
- Halogen Free
- Operating temperature range of −40 °F to +266 °F
- Insulation voltage of up to 1000 V AC, 1500 V DC
- Equipment voltage of up to 1000 V AC, 1500 V DC
- UL Recognised Component; file number E505645
Our standoff insulators are made from a halogen-free glass-reinforced material, which was specifically chosen for its mechanical and electrical insulation properties.
Brass inserts are used due to this alloy’s resistance to corrosion. The injection moulding process, combined with our excellent quality control and inspection procedures, results in a consistent product across every production run.
Termate carries out rigorous and appropriate testing on all our products. The AU6 range of standoff insulators successfully passed extensive testing to ensure their electrical and mechanical capabilities.
Termate has obtained UL Component Recognition for our insulators. Where applicable, they comply with both UL891 Annex G and UL508A Annex D for brace and support requirements for panelboard and switchboard accessories.
AU6 standoff insulators meet the requirements for UL 94 V-0. UL 94 being a standard for the safety of flammability of plastic materials for parts in devices and appliances released by the Underwriters Laboratories.
Our Standoff insulator range is a UL Recognised Component and are listed under the product category “Panelboard and Switchboard Accessories – Component”, more information can be found at UL Product IQ.
Our standoff insulators are suitable for assemblies up to 1000 V AC or up to 1500 V DC. They are intended to safely and securely support and insulate busbars and other live conductors by maintaining a distance between two surfaces. In these types of installations, the electrical insulation and the mechanical strength of the support are paramount.
Usual installations are within:
- Energy Storage Systems and Equipment (UL9540)
- Electrical Panelboards (UL67)
- Industrial Control Panels (UL508A)
- Switchboards (UL891)
- Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear (UL 1558)
- Inverters, Converters, Controllers and Interconnection System Equipment for Use With Distributed Energy Resources (UL1741)
These electrical installations can be found in a wide range of sectors including power distribution, rail (rolling stock & trackside), renewable energy, UPS (temporary and emergency power), and data centre power distribution.
At Termate, we have been designing and manufacturing electrical insulating parts and components, such as our standoff insulators, from our Nottingham UK based factory for over 60 years. Quality is ensured on every product we produce.
Our knowledge and experience of the raw materials used, the performance requirements, and the application of our products allow us to provide products that are safe and fit for purpose.
Termate is committed to the highest standard of customer focus and we have made every effort to maintain the accuracy and completeness of the information provided in this data.
Where improvements to our products affect their installation and usage we endeavour to contact any customers who may be affected.
Warranty as stated in our Terms and Conditions of Trading is void if any modification is made to the warranted product.