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Heat Exchanger, Boiler & Condenser Tube Plugs

Shoulder(Header) Plugs
UNF Plugs for Fin-Fans®

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Technical Data Sheet

Shoulder Plug (Header Plug)

DS-SP-HP-001 Rev. Current

Plug Sizes

3/4" – 2-1/8"For 5/8" – 2" Tube O.D.

Length Under Head

3/4" – 3"

Fast Delivery

Same-DayStock items · TX & LA local

Custom Options

AvailableNon-standard sizes & alloys

Specification	Details
Materials	Carbon Steel • 316 Stainless Steel • Custom alloys & coatings
Installation	Threaded design fits header plug sheets
Plug Sizes	3/4" – 2-1/8" (for 5/8" – 2" Tube O.D.)
Length Under Head	3/4" – 3"

Easy Installation Threaded design fits header plug sheets for quick, reliable installation

Maintenance-Friendly Allows access for inspection, cleaning, and tube plugging

Durable & Safe Handles high pressure and temperature; prevents leaks

Industries & Applications

Oil & Gas Refineries Petrochemical Power Plants Air-Cooled Heat Exchangers

Shoulder Plug
Description

Shoulder Plug
Sizing Chart

Product Overview

Shoulder Plugs

Header Plugs / UNF Plugs — Fin-Fan® Heat Exchangers

USA Industries is the preferred supplier for many of the world's largest power plants, refineries, and chemical facilities for header plugs. Threaded plugs specifically designed for use in Fin-Fan® air-cooled heat exchangers — extracting heat from process fluids by transferring it to the surrounding air.

Metals

Manufactured in nearly any metal combination — carbon steel, stainless steel, copper, and brass as standard, with additional alloys available.

Coatings

Available in cadmium, electroless nickel, galvanized, nickel, zinc, or uncoated — to match your application and environment.

Production

Capacity to manufacture over 1,000 header plugs per day — maintaining high quality and adhering to your precise specifications.

Availability

In-stock plugs and gaskets ship same day — 24/7 shipping available. Order plugs and gaskets together and save.

Built for Industrial Turnarounds

For the world's largest industrial facilities, halting a shutdown for a small heat exchanger part is not an option. Our rapid production and same-day shipping ensure your turnaround stays on schedule — no matter the quantity or specification required.

Also Known As

Shoulder Plugs· UNF Plugs· Fin-Fan Plugs· Heat Exchanger Header Plugs

Fin-Fan® is a registered trademark of Hudson Products Corporation.

⚠ Warning: Never stand in front of an installed plug under pressure. Plugs ejected under pressure can cause serious bodily injury.

12 sizes

Minimum Torque Values for AISI 1008 Material - Consult Factory for Other Material Values
Base Dimensions					Flat Gasket		EZ Torque® Gasket
Tube O.D.	"A" Plug Thread O.D.click to highlight	UNF Threadclick to highlight	"B" Length Under Headclick to highlight	Hex Sizeclick to highlight	Stock #click to highlight	Torque Ft/Lbsclick to highlight	Stock #click to highlight	Torque Ft/Lbsclick to highlight

Material Codes — substitute <> suffix in stock numbers

C Carbon Steel

B Brass

S 316 SS

J 70/30 CuNi

K 90/10 CuNi

Y Chrome/Moly

M Monel

I Inconel

N Nickel 200

T Titanium

H Hastelloy

Z Zirconium

* Other alloys available. Consult factory for other material torque values. Available coatings: Cadmium, Electroless Nickel, Galvanized, Nickel, Zinc, or Uncoated.