Header / Shoulder Plugs for Exchangers
Shoulder plugs or header plugs are made for plug type header boxes in air-cooled heat exchangers/vin fan air coolers.
Opposite each tube is a shoulder plug and gasket that provides access for inspection and cleaning of individual tubes. Spare plugs and gaskets may be needed to replace originals during routine maintenance or to seal leaking tubes.
Shoulder plugs are made from different material grades, such as carbon steel SA 105 and SA 350LF2 or stainless steel AISI 304L, AISI 316L, AISI 321 and also from Duplex stainless F51, F53, F55 as well as Nickel alloys Inconel 625, Inconel 825 and Inconel 925.
Shoulder Plug Sizing Chart
| Plug | Std | Length | Length | Hex Size Inch |
Hex Size MM |
| Dia | UNF | Under Head Inch |
Under Head MM |
||
| 3/4 | 16 | 5/8 | 15.90 | 1 | 25.40 |
| 3/4 | 19.05 | ||||
| 7/8 | 22.23 | ||||
| 1 | 25.40 | ||||
| 1.1/4 | 30.75 | ||||
| 7/8 | 14 | 7/8 | 22.23 | 1.1/8 | 28.58 |
| 1 | 25.40 | ||||
| 1.1/8 | 12 | 3/4 | 19.05 | 1.3/8 | 34.93 |
| 7/8 | 22.23 | ||||
| 1 | 25.40 | ||||
| 1.1/8 | 28.58 | ||||
| 1.1/4 | 30.75 | ||||
| 1.3/8 | 34.93 | ||||
| 1.1/2 | 38.10 | ||||
| 1.5/8 | 41.28 | ||||
| 1.3/4 | 44.45 | ||||
| 2 | 50.80 | ||||
| 1.3/8 | 12 | 3/4 | 19.05 | 1.5/8 | 41.28 |
| 7/8 | 22.23 | ||||
| 1 | 25.40 | ||||
| 1.1/8 | 28.58 | ||||
| 1.5/8 | 12 | 7/8 | 22.23 | 1.7/8 | 47.63 |
| 1 | 25.40 |
Reference(s) ..
usaindustries.com
powerbolt.eu
robinsontubetools.com