Header & Shoulder Plugs
Products
Shoulder Plugs / Header Plugs for
Air Cooled Heat Exchangers & Fin Fan Coolers
we specialize in manufacturing and supplying high-performance shoulder plugs (header plugs) designed for air cooled heat exchangers and fin fan air coolers. These plugs are installed in plug-type header boxes and paired with gaskets opposite each tube, providing easy access for inspection, cleaning, and maintenance. This simple yet effective design ensures leak-tight operation, enhances system reliability, and extends the service life of your equipment.
During routine maintenance or shutdowns, spare plugs and gaskets are often required to replace damaged parts or to safely plug leaking tubes. By ensuring proper sealing, our header plugs minimize downtime, reduce maintenance costs, and help maintain optimum heat exchanger performance.
Our header plugs are trusted across offshore and onshore oil & gas production facilities, petrochemical plants, refineries, power plants, and process industries. Built to handle high pressure, high temperature, and corrosive environments, they deliver unmatched durability and sealing efficiency in the most demanding applications.
We offer header plugs in a complete range of premium materials, including:
- Stainless Steel 304 / 316
- Duplex & Super Duplex Stainless Steel
- Carbon Steel & Alloy Steels
- Exotic Alloys: Inconel, Hastelloy, Monel, Titanium, Brass
With custom sizes and tailor-made designs, Metalok Industries ensures every product is engineered to meet your exact project specifications. Each header plug is manufactured under strict quality control, supported with Material Test Certificates (MTCs) and compliance to international standards.
Q: Looking for header plugs in the material of your choice – from SS 304, SS 316, Duplex, Super Duplex to exotic alloys like Inconel, Monel & Titanium?
- Wide material availability: SS 304, SS 316, Duplex, Super Duplex, and Carbon Steel
- Exotic alloys like Inconel, Monel, Hastelloy, and Titanium for critical applications
- Corrosion-resistant materials suitable for offshore, onshore, and chemical industries
- High-strength metals to ensure durability and long service life
- Custom material selection based on client requirements and operating conditions
Header & Shoulder plugs 2D Drawing
Datasheet For Header Plug / Shoulder Plug /UNF Plug
| Tube OD | Plug Diameter (B) | UNF Thread | Under Head (A) | Hex Size |
|---|---|---|---|---|
| 5/8″ | 3/4″ | 16 | 3/4″, 7/8″, 1″ | 1″ |
| 1″ | 1 1/8″ | 12 | 3/4″, 7/8″, 1″, 1 1/8″, 1 1/4″, 1 3/8″, 1 1/2″ | 1 3/8″ |
| 1 1/4″ | 1 3/8″ | 12 | 3/4″, 7/8″, 1″, 1 1/8″, 1 1/4″, 1 1/2″ | 1 5/8″ |
| 1 1/2″ | 1 5/8″ | 12 | 1″, 1 1/8″, 1 1/4″, 1 3/8″, 1 1/2″ | 1 7/8″ |
| 2″ | 2 1/8″ | 12 | 1 1/4″ | 2 3/8″ |
Required Torque To Set Header Plug
| Plug Diameter | C.S. Plug with Soft Iron Gasket Target Torque (ft lbs) | C.S. Plug with Soft Iron Gasket Max Torque (ft lbs) | SS and Alloy Gaskets Target Torque (ft lbs) | SS and Alloy Gaskets Max Torque (ft lbs) |
| 1-1/8″ | 250 | 400 | 400 | 550 |
| 1-1/4″ | 300 | 450 | 425 | 600 |
| 1-3/8″ | 350 | 500 | 450 | 650 |