Malleable iron Plain Plug Fig 291 A197 NPTASTM

Product Overview

This malleable iron Plain Plug Fig 291 A197 NPTis manufactured in accordance with ASTM standards. It is used for sealing pipeline ends with simple structure and convenient installation, suitable for pipe terminals, test ports and temporary plugging. Made of high-quality black heart malleable iron with high-temperature annealing, it features good toughness, high strength and impact resistance. With high-precision threads for tight and reliable sealing, it is available in black, electro-galvanized or hot-dip galvanized finish with strong corrosion resistance, widely used in water, gas, steam, fire protection and various industrial low-pressure fluid piping systems.

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Product details

Product Features (Specifications – Plain English List)

Standard: ASTM A197
Type: Plain Plug Fig 291
Material: Black Heart Malleable Iron
Pressure Class: 150LB / 300LB
Temperature Range: -20℃ ~ 230℃
Thread Standard: NPT / BSP
Surface Treatment: Black / Electro-galvanized / Hot-dip Galvanized
Applicable Media: Water, hot water, oil, gas, compressed air, fire water, low-pressure steam

Specifications Table (Dimensions & Parameters)

Size	Inch	1/8	1/4	3/8	1/2	3/4	1	114
Size	mm	6	8	10	15	20	25	32
Dim.(mm）	A	15.5	18.3	20.1	23.9	27.2	31.8
Size	Inch	112	2	21/2	3	4	6
Size	mm	40	50	65	80	100	150
Dim.(mm）	A	36.9	39.7	46	49	64.5	71.5

Product Applications

Fire Protection Systems: End plugging and test port sealing for sprinkler pipelines
Water Supply & Drainage: End plugging for building pipelines
HVAC & Heating: End closing for boiler and radiator pipelines
Industrial Pipelines: Plugging for compressed air and low-pressure steam pipelines
Gas Engineering: End sealing for gas pipelines
Marine & Mining: General low-pressure fluid pipeline sealing

Installation and Maintenance

Installation

Inspect the Plain Plug Fig 291 A197 NPTbefore installation to ensure no sand holes, cracks, deformation and intact threads
Clean impurities and burrs at pipe ends to keep connecting surfaces clean
Wind PTFE tape clockwise or apply pipe thread sealant on male threads
Tighten evenly with tools to avoid cracking due to excessive force
Pressure test after installation; put into use only after confirming no leakage and looseness

Maintenance

Regularly check joints for leakage, thread looseness and surface corrosion
Paint anti-rust paint regularly for outdoor or humid environments to extend service life
Replace immediately in case of cracks, deformation or sealing failure

FAQ

Can you supply OEM?

OEM is available. We can customize the product according to your specific requirements, including logo printing and packaging design.

What’s the MOQ?

The MOQ is 500 pieces. For customized products with special sizes or surface treatments, the MOQ may vary.

How about the order processing and lead time?

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.

What quality will be ensured?

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.

Can you guide the installation?

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.

Contact Information

Sales Inquiry:
Provide contact information for sales inquiries.

Email: [email protected]

Phone: +86 13012223295

Technical Support

If you have any questions regarding product installation, commissioning, operation or maintenance, please contact our technical support team for professional assistance:

Email: [email protected]