Description
Overview:
The 1.1/2" BSPP Female Flanged Backnut Brass (812 415) is a robust fixing nut used to secure male-threaded fittings to tanks, panels, and pipework assemblies. Made from solid brass, it offers good corrosion resistance in hot and cold water and central heating circuits. The parallel BSPP female thread in 1.1/2" size (38.1 mm) suits standard British pipe threads (ISO 228) and is intended for use with a sealing washer on the mating face. The flanged design spreads load and helps protect softer materials such as plastic cisterns or thin steel panels. It installs with a spanner and requires no soldering, making it a practical choice for both tradespeople and DIY users. Commonly applied on valves, tank connectors, and pump or manifold unions. OEM reference: BK112.
Key Features:
- 1.1/2" BSPP parallel female thread (38.1 mm) for standard British pipe fittings
- Flanged backnut spreads clamping load and improves joint stability
- Durable brass construction for resistance to corrosion and scale build-up
- Clean machined threads for smooth engagement and reliable tightening
- No soldering required; fits with standard spanners
- Designed for use with fibre, rubber, or PTFE washers to seal parallel threads
- Suitable for hot and cold water and central heating pipework
- Helps create a secure, leak-resistant joint when correctly assembled
- Reusable component for maintenance and refurbishment tasks
- Clear identification: product code 812 415; OEM reference BK112
Typical Applications:
Used to secure tank connectors, tap tails, valve stems, and bulkhead fittings through cisterns, header tanks, calorifiers, radiators with threaded unions, and equipment panels. Common in domestic and commercial plumbing rooms, plant areas, irrigation systems, and general water supply lines. Ideal where a firm clamping action and a washer-sealed BSPP joint are required without soldering, such as connecting pumps, isolation valves, and manifolds.
Also known as:
Flanged back nut, brass BSPP backnut, 1.1/2 inch brass back nut (38.1 mm), female parallel pipe backnut, bulkhead backnut, tank connector locknut, female BSPP locknut, plumbing backnut, flanged fixing nut for pipework.
Product Specifications
| L&S Part No. | 812 415 |
|---|---|
| Unit of Sale | 1 |
| Key Features | - 1.1/2" BSPP female thread for British pipe fittings - Flanged design spreads load, protects softer materials - Brass construction resists corrosion and scale - Installs with spanner, no soldering needed - Suitable for hot and cold water systems |
