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Black-Max® Handhole
Resilient Black-Max® Handhole gaskets offer robust protection and secure, airtight seals for pressurized boiler systems.
We have a full inventory of OEM-compatible Black-Max® Gaskets at all sizes and horsepower requirements.
Part # | Diameter | Model | HP Range
- BKM306-7102-1/4" x 3-1/2" x 1/2"E
- BKM306-7142-1/2" x 3-1/2" x 1/2"E
- BKM306-7152-3/4" x 3-5/8" x 1/2"E
- BKM306-7223" x 4" x 3/8"E
- BKM306-7243" x 4" x 1/2"E
- BKM306-7253" x 4" x 5/8"E
- BKM306-7333" x 5" x 1/2"E
- BKM306-7993-1/4" x 4-1/4" x 1/2"E
- BKM306-7363-1/4" x 4-1/2" x 1/2"E
- BKM306-7373-1/4" x 4-1/2" x 9/16"E
- BKM306-7383-1/4" x 4-1/2" x 5/8"E
- BKM306-7413-1/4" x 4-3/4" x 1/2"E
- BKM306-7403-1/4" x 5" x 1/2"E
- BKM306-7393-1/4" x 5" x 9/16"E
- BKM306-7433-1/4" x 5" x 5/8"E
- BKM306-7443-1/4" x 5-1/2" x 1/2"E
- BKM306-7473-1/2" x 4-1/2" x 1/2"E
- BKM306-7503-1/2" x 4-1/2" x 5/8"E
- BKM306-7523-1/2" x 5" x 1"E
- BKM306-7563-3/4" x 4-3/4" x 9/16"E
- BKM306-9714" x 6" x 1/2"E
- BKM306-9734" x 5" x 5/8"E
- BKM306-9714" x 6" x 1/2"E
- BKM306-9744" x 6" x 5/8"E
- BKM306-9724" x 6" x 3/4"E
- BKM306-7684" x 6" x 1"E
- BKM306-7806" x 8" x 5/8"E
- BKM306-7826" x 8" x 1"E
- BKM306-7012-1/4" x 3-1/2" x 1/2"OB
- BKM306-7062-1/2" x 3-3/4" x 1/2"OB
- BKM306-9283" x 4" x 1/2"OB
- BKM306-9083" x 4-1/2" x 1/2"OB
- BKM306-9103-1/4" x 4-1/4" x 1/2"OB
- BKM306-9113-1/4" x 4-1/4" x 9/16"OB
- BKM306-9323-1/4" x 4-1/2" x 1/2"OB
- BKM306-9353-1/4" x 4-1/2" x 9/16"OB
- BKM306-9373-1/4" x 5" x 9/16"OB
- BKM306-9493-1/2" x 4-1/2" x 1/2"OB
- BKM306-9503-1/2" x 4-1/2" x 9/16"OB
In-stock items. Order by 2:00 PM EST for Same-Day Shipping.
Need help finding the right gasket?
We have expert-level staff ready to assist you.
Frequently Asked Questions About Black-Max® Gaskets
What is a Black-Max® gasket and what is its primary function?
A Black-Max® gasket is a heavy-duty, premium-grade refractory sealing component engineered with a resilient graphite-treated wire structure. Its primary function is to deliver exceptional sealing strength for demanding, high-pressure industrial steam applications and water containment lines. These gaskets conform tightly to uneven, legacy, or pitted structural steel pathways around manway and handhole inspection portals, creating a completely secure, gas-tight, and leak-proof seal under intense compression.
Why are Black-Max® gaskets specifically chosen for pitted or legacy structural steel paths?
Over years of operational firing and intensive water treatment cycles, standard boiler handhole and manhole metal seating frames naturally experience localized corrosion, pitting, or physical surface irregularities. Unlike basic rigid seals that can allow steam to bypass uneven gaps, the graphite compound structure of a Black-Max® gasket possesses unique malleable properties and material recovery memory. When compressed, it flows cleanly into surface pits and micro-imperfections, actively blocking dangerous hot spots and preventing premature blowout failures.
Why should I source my replacement Black-Max® gaskets from Halmar?
Sourcing proprietary brand insulation and sealing components directly from factory original equipment manufacturers (OEMs) often forces procurement managers to face extensive distributor friction, long factory backorders, and inflated pricing structures. Halmar operates as an independent domestic supplier controlling an extensive, on-the-shelf catalog of high-durability aftermarket boiler parts. We maintain deep, ready-to-ship inventory pools of authentic black-max gaskets inside our clean Louisville, Kentucky warehouse, allowing us to guarantee precise dimensional tracking and fast, responsive same-day shipping directly to your facility or field site.
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