Heavy-Duty Washers seal large through holes.

Press Release Summary:

Available with 12.7–25.4 mm outside diameters and max through-hole sizes from 6.35–15.87 mm, SEELOC® Heavy-Duty Washers are built on ribbed silicone rubber section that is molded onto cup-shaped stainless steel base, creating high-pressure seal to 100 psi. Liquid-tight self-sealing washers are rated for IP66/68 protection and can handle temperatures from -106 to +260°C. Products are suited for sealing elongated or enlarged mounting holes in enclosures used outdoors or in adverse environments.

Original Press Release:

APM Hexseal Introduces Heavy Duty Line of Sealing Washers

Up to 200% Tightening Torque Withstand Increase; Ideal for Sealing Larger Through Holes Found When Mounting Hardware and Covers to Electrical Cabinets and Machinery


APM HEXSEAL has announced the expansion of their SEELOC® self-sealing, high-pressure washer line to include a complete range of HEAVY DUTY sizes. According to APM Director of International Business, John Doda, "There has been an increasing demand by OEMs for sealing elongated or enlarged mounting holes in enclosures used outdoors or in adverse environments for housing control and/or power devices for the industrial, marine, medical, military, air and rail transportation and utility markets".  Doda added that "the washer outside diameters will be from 12.7mm to 25.4mm, with maximum thru-hole sizes from 6.35mm to 15.87mm". Additional sizes are contemplated, based on demand. Doda also states that, "The HEAVY DUTY line will allow smaller thread sizes to effectively seal larger through holes, without collapsing the washers. We have invested significant research and development time to find the optimum steel thickness to give up to TWICE THE TORQUE WITHSTAND of the standard line and yet still give an aesthetically pleasing appearance."

The SEELOC® washer platform is built on a uniquely profiled and ribbed silicone rubber section that is molded onto a cup-shaped 300 series stainless steel base, creating a high-pressure seal to 100psi. SEELOCs are rated for IP66/68 (Type 4X & Type 6) enclosure protection, and are resistant to salt water, acids, weather, sunlight, ozone and a myriad of harsh and hostile conditions. They can easily handle temperatures from -106C to +260C.


APM Hexseal self-sealing hardware has been sold for more than 50 years under the following trademarks: SEELBOLT®, SEELSKREW®, SEELNUT®, SEELRIVET® and SEELOC®. APM self-sealing hardware is sold by leading electronics and hardware distributors throughout the United States, Canada, Mexico and worldwide. For the name and location of your nearest distributor, visit the APM Hexseal web site, www.apmhexseal.com.

For  literature/samples contact:


44 Honeck Street

Englewood, NJ 07631

Tel:  201.569.5700

FAX: 201.569.4106

Email:  info@apmhexseal.com

Web:  www.apmhexseal.com

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