Shoulder Plugs (Header Plugs)
Threaded header, hex head, and UNF plugs built for Fin-Fan® air-cooled heat exchangers. Made in nearly any metal and coating, and trusted by many of the world's largest power plants, refineries, and chemical facilities.
Shoulder (Header) Plug
Laser-Etched Plugs
Get a Quote or Order
Call (800) 456-8721 or send us these details and we'll respond the same business day.
- Plug diameter (see the sizing chart)
- UNF size (threads per inch)
- Length under the head
- Material and coating
- Gaskets: flat or EZ Torque®
- Quantity and date needed
Also known as:
| Specification | Details |
|---|---|
| Design | Threaded hex head plug (UNF) |
| Plug Sizes | 3/4" through 2-1/8" (for 5/8" to 2" tube OD) |
| Length Under Head | 3/4" through 3" |
| Materials | Carbon Steel • 316 Stainless • Brass • Copper (custom alloys available) |
| Coatings | Cadmium • Electroless Nickel • Galvanized • Nickel • Zinc • Uncoated |
| Gaskets | Flat • EZ Torque® (under 50% of flat gasket torque) |
| Installation | Threads into the header plug sheet |
| Custom Options | Non-standard sizes, thread counts, thread lengths, and alloys |
| Minimum Order | None (price breaks on larger quantities) |
| Delivery | Stock items ship same day (same-day local in TX & LA) |
Built for Turnarounds
Shoulder Plug Sizes
| Base Dimensions (in.) | Flat Gasket | EZ Torque® Gasket | ||||||
|---|---|---|---|---|---|---|---|---|
| Tube O.D. | "A" Thread O.D. | UNF Thread | "B" Length Under Head | Hex Size | Stock # | Torque Ft/Lbs | Stock # | Torque Ft/Lbs |
Any Metal, Any Coating
Fin-Fan® is a registered trademark of Hudson Products Corporation.
EZ Torque® Header Plug Gaskets
EZ Torque® gaskets seal with less than half the torque a flat gasket needs. Order them with your plugs and save.
Cut Delivery From Weeks to Days
Need one plug tomorrow or a full turnaround's worth? See how fast we can deliver.
Shoulder Plug FAQ
What is the minimum quantity I can order?
There's no minimum. Sometimes you need one plug there tomorrow, and we're here to help. We offer price breaks on larger quantities.
Can you supply the gaskets for these plugs?
Yes. We offer flat gaskets and our EZ Torque® Gaskets, which need less than 50% of the torque a flat gasket requires to seal.
Can I get my header plugs zinc coated?
Yes. We offer zinc and black iron coatings on our header plugs and shoulder plugs.
Can I get these cadmium plated?
Yes, we can have your plugs cadmium plated.
I need a size that isn't listed. What should I do?
Call us. We're a custom machine shop as well as a tube plug manufacturer, and we can make plugs to any custom specification.
Can I get a different thread count, thread length, or other spec?
Yes. We customize plugs to your exact specifications.
Why Choose USA Industries
From pipe blinds to heat exchanger tools, we deliver custom-engineered products with the fastest turnaround times in the industry.
Fastest Turnaround
Available 24/7 - 365 days a year with same-day shipping available on stock items. Custom orders in days, not weeks.
Direct Pricing
No middlemen markup. Buy direct from the manufacturer with 40+ years of industry excellence and save.
Custom Engineering
Custom solutions designed to your exact specifications.
ISO Certified Quality
A quality driven ISO 9001:2015 certified manufacturer ensures consistent excellence.
BBB A+ Rated
The highest grade awarded, signifying USAI operates with high integrity and a strong commitment to resolving customer issues.