Steel Internal Thread Plugs of 2025
Best Choice1
AilbiukoAilbiuko 25Pcs 304 Stainless Steel Pipe Plug Fittings Assortment Kit,5 Sizes 1/8" 1/4" 3/8" 1/2" 3/4" NPT Male Internal Hex Thread Socket Pipe Plug Set
Main highlights- WIDE APPLICATION: Designed to create a tighter seal for masking threaded holes and is commonly used to seal holes in machinery, fittings, or pipes to prevent leakage of air, steam, gases, water, oil, and fluids under pressure. These plugs are also great for blocking off intake manifold water ports, water pump ports, water temp and oil sender holes, engine block holes, etc
- SEALING DESIGN: A mechanical fastener, the role is sealing. Male National Pipe Taper (NPT) threads are for use with female-threaded pipes; Male pipe threads are for connecting to female-threaded pipes or fittings. Hex-threaded head design for quick installation and removal. Suitable for closing the ends of the pipe or tube
- PREMIUM MATERIAL: Made of 304 stainless steel with superior acid resistance, anti-corrosion and high strength, strong texture, high hardness, standard thread, not easy to slip
- MULTIPLE SIZE: This kit includes 5 sizes of pipe plug fittings, which are 1/8", 1/4", 3/8", 1/2", 3/4", and 25pcs in total. They are sorted and packed in a plastic box. Enough quantity and size will support your entire project. We are equipped with size labels and a sturdy box for storage
- EXCELLENT CRAFTSMANSHIP: We pay attention to every detail of the products. These pipe fittings have deep threads and are not easy to slip during installation; the bottom is smooth and free of burrs, which will not harm your pipeline
9.7Exceptional
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Value for Money2
KUANVEKUANVE 20 Pcs Stainless Steel Pipe Plug Fitting Assortment Kit, 5 Sizes 1/8" 1/4" 3/8" 1/2" 3/4" NPT Male Internal Hex Thread Socket Pipe Plug for Sealing Pipe Port
Main highlights- Wide Applications: Not only work great on preventing leakage of air, steam, gases, water, oil and fluids under pressure, but also great for blocking off intake manifold water ports, water pump ports, water temp and oil sender holes, engine block holes, etc
- Sealing Design: A mechanical fasteners, the role is sealing. Male National Pipe Taper (NPT) threads for using with female threaded pipes; Male pipe threads for connecting to female threaded pipes or fittings. Hex threaded head design for quickly installation and removal. Suitable for closing the ends of the pipe or tube
- Premium Material: Made from great 304 stainless steel with superior acid-resistance, anti-corrosion and high strength, strong texture, high hardness, standard thread, not easy to slip
- Package: You will get 20 pieces pipe fitting assortment kit in 5 sizes, NPT 1/8", NPT 1/4", NPT 3/8", NPT 1/2", NPT 3/4", 4 pieces/size, storage in a plastic box for your industrial needs
- Inner Hex Drive Type: Countersunk plug with a hex drive for closing the end of a pipe or fitting. 5 sizes pipe plugs for different needs
9.6Exceptional
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3
TAISHERTAISHER 10PCS 304 Stainless Steel Internal Hex Thread Socket Pipe Plug Fitting 1/8" NPT Male
Main highlights- Working Temperature —— Temperature range from -80 to 1472 degrees F/-62 to 800 degrees c.
- Special Feature —— The quality of forged stainless steel is better than casting.
- Product Type —— Internal Hex Thread Socket Pipe Plug Fitting(1/8"Male NPT),for industry connecting pipes or fittings with different end types,diameters,or materials,NPT thread size does not actual diameter,it is only nominal pipe size.
- Product Material —— Forging of 304 stainless steel strength and resistance to corrosion.
- Maximum Pressure —— Maximum working pressure is 2800PSI.
9.3Excellent
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4
JoywayusJoywayus 5Pcs Stainless Steel Internal Hex Thread Socket Pipe Plug 1/16"NPT Male
Main highlights- Thread Size : 1/16" NPT Male
- Male National Pipe Taper (NPT) threads for use with female threaded pipes
- Made from stainless steel for strength
- It is a Silver tone internal Hex Head Pipe Connector that is for closing and terminating the end of a pipe.
- Great for blocking off water ports, water pump ports and water temp tank, etc
9.2Excellent
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5
carvedexquisitelyCarvedexquisitely Stainless Steel Internal Hex Countersunk Male Thread Pipe Plug Connector, 1" NPT Male（Packs for 2）
Main highlights- Wrap tape or pipe sealant when in use to achieve a better seal
- Suitable for blocking the intake manifold nozzle, engine block, water pump port, water temperature and oil sensor hole, etc.
- Solid hexagon plug for closing and terminating the end of the pipe.
- Size:1" NPT male threaded,the actual diameter of 1" thread is 1.31 inch,NPT thread size is not the actual diameter, it is only nominal pipe size.
- Made of 304 stainless steel, it is corrosion-resistant, high-strength, sturdy and durable.
9.1Excellent
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6
HmknanaHmknana 60PCS Black Carbon Steel Pipe Plug Fitting Assortment Kit - 5 Sizes 1/8" 1/4" 3/8" 1/2" 3/4" NPT Male Internal Hex Thread Socket for Sealing Port H-053
Main highlights- Product introduce: 60PCS Pipe Plug Fitting Assortment Kit;These pipe plugs have five standard thread sizes to meet your different needs.
- Product include: This assortment kit comes in 5 Sizes,60pcs (18pcs 1/8", 14pcs 1/4", 12pcs 3/8", 10pcs 1/2", 6pcs 3/4")
- Product features: They are made of carbon steel,solid construction,wear resistance,corrosion resistance,rust resistance,clear and standard thread,not easy to slip.
- Product application: It is used for sealing pipe port,it can be used to prevent leakage of gas,liquid,oil.It can be used in humid environment.
- Easy to use: It can be installed and removed by hand or a wrench.They are packed in a labeled plastic box,which is convenient for storaging,selecting and using.
8.9Very Good
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7
PATIKILPATIKIL 7/16-20UNF Internal Hex Head Pipe Fitting Plug, 3 Pack Male Thread 45# Steel Socket Plug with Sealing Ring for Terminate Pipe Ends
Main highlights- Specification: Color: Silver Tone; Material: 45# Steel, Zinc Plated; Thread Size: 7/16-20UNF; Internal Hex Width: 5mm / 0.2 inch; Overall Height: 14 x 12mm / 0.55 x 0.47 inch (D*H)
- NOTE: When installing, choose the correct wrench to prevent the pipe fittings from being deformed and damaged.
- Instruction: The sealing ring provides a tight sealing performance, easy to install, countersunk hex head increases leverage, used with a wrench.
- Application: These threaded male plugs are used to seal holes in machinery, fittings, or pipes to prevent leakage of air, steam, gas, water, oil and fluids under pressure. These plugs are also great for plugging in intake manifold water ports, water pump ports, engine plug holes, and more.
- Advantage: Made from 45# Steel for good strength and corrosion resistance. The internal hex head design is convenient for you to install.
8.8Very Good
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8
PATIKILPATIKIL M12*1 Internal Hex Head Pipe Fitting Plug, 2 Pack Male Thread 45# Steel Socket Plug with Sealing Ring for Terminate Pipe Ends
Main highlights- Specification: Color: Silver Tone; Material: 45# Steel, Zinc Plated; Thread Size: M12*1mm; Internal Hex Width: 6mm / 0.24 inch; Overall Height: 17 x 17mm / 0.67 x 0.67 inch (D*H)
- NOTE: When installing, choose the correct wrench to prevent the pipe fittings from being deformed and damaged.
- Instruction: The sealing ring provides a tight sealing performance, easy to install, countersunk hex head increases leverage, used with a wrench.
- Application: These threaded male plugs are used to seal holes in machinery, fittings, or pipes to prevent leakage of air, steam, gas, water, oil and fluids under pressure. These plugs are also great for plugging in intake manifold water ports, water pump ports, engine plug holes, and more.
- Advantage: Made from 45# Steel for good strength and corrosion resistance. The internal hex head design is convenient for you to install.
8.7Very Good
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9
ONMOPLS20 Pcs Stainless Steel Pipe Plug Fitting, 5 Sizes 1/8" 1/4" 3/8" 1/2" 3/4" NPT Male Internal Hex Thread Socket Pipe Plug Fitting Assortment Kit
Main highlights- Wide Applications: Not only work great on preventing leakage of air, steam, gases, water, oil and fluids under pressure, but also great for blocking off intake manifold water ports, water pump ports, water temp and oil sender holes, engine block holes, etc
- Sealing Design: A mechanical fasteners, the role is sealing. Male National Pipe Taper (NPT) threads for using with female threaded pipes; Male pipe threads for connecting to female threaded pipes or fittings. Hex threaded head design for quickly installation and removal. Suitable for closing the ends of the pipe or tube
- Premium Material: Made from great 304 stainless steel with superior acid-resistance, anti-corrosion and high strength, strong texture, high hardness, standard thread, not easy to slip
- Package: You will get 20 pieces pipe fitting assortment kit in 5 sizes, NPT 1/8", NPT 1/4", NPT 3/8", NPT 1/2", NPT 3/4", 4 pieces/size, storage in a box for your industrial needs
- Inner Hex Drive Type: Countersunk plug with a hex drive for closing the end of a pipe or fitting. 5 sizes pipe plugs for different needs
8.4Good
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10
PATIKILPATIKIL M20*1.5 Internal Hex Head Pipe Fitting Plug, Male Thread 45# Steel Socket Plug with Sealing Ring for Terminate Pipe Ends
Main highlights- Specification: Color: Silver Tone; Material: 45# Steel, Zinc Plated; Thread Size: M20*1.5mm; Internal Hex Width: 10mm / 0.39 inch; Overall Height: 26 x 19mm / 1.02 x 0.75 inch (D*H)
- NOTE: When installing, choose the correct wrench to prevent the pipe fittings from being deformed and damaged.
- Instruction: The sealing ring provides a tight sealing performance, easy to install, countersunk hex head increases leverage, used with a wrench.
- Application: These threaded male plugs are used to seal holes in machinery, fittings, or pipes to prevent leakage of air, steam, gas, water, oil and fluids under pressure. These plugs are also great for plugging in intake manifold water ports, water pump ports, engine plug holes, and more.
- Advantage: Made from 45# Steel for good strength and corrosion resistance. The internal hex head design is convenient for you to install.
8.2Good
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