J8-125 Post Ceramic Insulator 8kN Bending Strength
Post Insulators
Product Overview
A white glazed solid-core post insulator rated 125 kV BIL with 8 kN bending strength, used where a live part has to be held rigidly and the mounting is by thread rather than flange. Threads are M16 on top and M20 at the base, the outer shed diameter is 110 mm and the body stands 210 mm tall. Maximum inner diameter is 95 mm.
Key benefits
Why Buyers Choose This Part
- M16 top and M20 bottom threads drop into existing threaded seats without an adapter
- 8 kN bending strength for busbar and switch support duty
- 125 kV BIL on a compact 210 mm body
- White glaze makes surface contamination easy to spot on inspection rounds
Application scenarios
Where It Is Used
- Busbar supports inside distribution switchgear cubicles
- Disconnector and isolator mountings where the seat is threaded
- Panel builds that need a short post with a defined bending rating
- Replacement of aged J8-125 units during switchgear overhaul
Who it is for
Who It Suits
- Switchgear and panel manufacturers
- Substation maintenance teams refurbishing cubicles
- Distributors supplying threaded post insulators
Problems it solves
What Goes Wrong Without The Right Part
- Threaded seats that a flange-mount post insulator will not fit
- Posts that flex under busbar short-circuit forces
- Contamination on a dark body that goes unnoticed until it flashes
- Height restrictions inside a cubicle that rule out a taller post
Technical features
How It Is Built
- 125 kV BIL
- 8 kN bending strength
- 110 mm maximum shed and outer diameter
- 95 mm maximum inner diameter
- 210 mm overall height
- 1 x M16 top and 1 x M20 bottom mounting threads
- White glaze finish
Specifications
Published Figures For This Product
Every value below comes from the manufacturer data for this item. Figures not listed are confirmed against the drawing before an order is placed.
| BIL | 125 kV |
|---|---|
| Bending Strength | 8 kN |
| Maximum Shed And Outer Diameter | 110 mm |
| Maximum Inner Diameter | 95 mm |
| Overall Height | 210 mm |
| Diameter | 110 mm |
Materials
Materials
- White glazed electrical porcelain
- Threaded metal inserts
Manufacturing
Process
- Body forming
- Glazing
- Firing
- Insert cementing
- Bending load proof test
Quality control
Testing
- Bending load proof test against the 8 kN figure
- Thread gauge check on the M16 and M20 inserts
- Glaze inspection for surface defects
Certifications
Certification
- ISO 9001 quality management system
Customisation
Customisation Options
- Alternative thread sizes produced to drawing
- OEM products supplied on request
- Made to your drawing or sample
Comparison
How It Compares
| Flange-mounted post insulator | Threaded top and bottom inserts suit cubicle seats that are tapped rather than drilled for a bolt pattern, which is common inside switchgear. |
|---|---|
| C4-80 II GOST post insulator | The J8-125 is specified by BIL and bending strength, the C4-80 II by GOST clauses. Choose by which standard your drawing quotes. |
Use guide
Before You Order And After It Arrives
- Check both thread sizes, M16 top and M20 bottom, against your seat
- Do not exceed 8 kN bending load in service
- Thread in by hand first, never force with a wrench from cold
- Clean the white glaze at each inspection so contamination stays visible
Questions
J8-125 Post Ceramic Insulator 8kN Bending Strength Questions
What are the mounting threads?
1 x M16 on top and 1 x M20 at the bottom.
What bending strength does it hold?
8 kN.
What is the BIL?
125 kV.
What are the overall dimensions?
210 mm high with a 110 mm maximum outer diameter and 95 mm maximum inner diameter.
Do you supply OEM versions?
Yes, OEM products are offered. We have produced for factories in European countries across several hundred bushing and insulator types.
How fast can you deliver?
Because we already run most of the common DIN, BS and AS patterns, repeat types move quickly. Send the quantity on WhatsApp for a firm date.
Related
Related Products
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- Creepage Distance 300 mm
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IPU-10/630-7.5 I UKhL1 Wall Bushing With Oval Flange
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Quote For J8-125 Post Ceramic Insulator 8kN Bending Strength
Send the quantity and any drawing you have. Enquiries are answered within 24 hours, and we produce to customer drawings and samples.