This malleable iron Backnut Fig 310 A197 NPT is manufactured in accordance with ASTM standards. It is mainly used for fixing and locking pipe fittings, valves, instruments and other components to prevent loosening and falling off. Made of high-quality black heart malleable iron with high-temperature annealing, it features good toughness, high strength and high-precision threads for tight and firm fitting. Available in black, electro-galvanized or hot-dip galvanized finish, it is corrosion-resistant and easy to install, widely used in water, gas, steam, fire protection and various industrial low-pressure fluid piping systems.
Malleable iron backnut is Malleable cast iron backnut (Recessed) is hexagonal nuts with female threaded connection, and it is used to tighten nipple or other pipe joint, so to avoid slippage.
| Size | Inch | 1/8 | 14 | 3/8 | 1/2 | 3/4 | 1 |
| mm | 6 | 8 | 10 | 15 | 20 | 25 | |
| Dim.(mm） | A Min | 4.8 | 6.4 | 7.1 | 7.9 | 8.6 | 9.7 |
| Size | Inch | 11/4 | 11/2 | 2 | 21/2 | 3 | 4 |
| mm | 32 | 40 | 50 | 65 | 80 | 100 | |
| Dim.(mm） | A Min | 10.7 | 11.9 | 13.5 | 15 | 17 | 20.3 |
OEM is available. We can customize the product according to your specific requirements, including logo printing and packaging design.
The MOQ is 500 pieces. For customized products with special sizes or surface treatments, the MOQ may vary.
After order confirmation and receipt of the advance payment, we will arrange production. Generally, the products can be ready for shipment within 15-20 working days. Once dispatched, we will notify you and provide all necessary documents for customs clearance.
All products are 100% new and undergo strict quality inspections, including pressure testing and dimensional checks, before delivery. We use sturdy wooden crates or cartons to ensure the products are well-protected during transportation.
Yes, we provide detailed installation instructions in English and other major languages. Our technical support team is also available for online consultation and guidance if needed.
Sales Inquiry:
Provide contact information for sales inquiries.
Email: [email protected]
Phone: +86 13012223295
If you have any questions regarding product installation, commissioning, operation or maintenance, please contact our technical support team for professional assistance:
Email: [email protected]
