What APM Hexseal does

APM Hexseal Corporation is a privately held U.S. manufacturer of environmental sealing solutions for electromechanical switches, circuit breakers, and threaded fasteners, founded in 1947 in Englewood, New Jersey. The company was established by Milton Morse and Riva Solins Morse after Morse designed the original sealing switch boot for U.S. military use during World War II; the firm subsequently co-developed what became the MIL-DTL-5423 specification that governs military switch boot sealing. APM Hexseal holds over 100 patents, has produced more than 50 million sealing boots historically, and maintains 1,049 National Stock Numbers with the U.S. government, alongside installations at 200,000+ customer sites worldwide.

The product portfolio falls into two families: (1) Sealing Boots & Bushings — molded silicone covers for toggle, pushbutton, rotary, rocker, and circuit breaker switches, plus panel bushing seals and the Illuma-Boots glow-in-the-dark variant; and (2) Sealing Hardware — self-sealing fasteners with embedded O-rings, including the trademarked Seelskrews, Seelbolts, Seelnuts, Nutzilla (sizes up to M90), Seeloc washers, and sealing socket head cap screws. All rubber compounding, molding, and finishing occur in-house at the 44 Honeck St, Englewood, NJ facility. End markets are vertically segmented, with primary exposure in defense/aerospace/military, marine, medical, food and beverage, and off-road/industrial equipment, plus secondary exposure in oil and gas, agriculture, energy generation, robotics, lighting, and electronics.

The revenue model is hardware sales through a multi-tier go-to-market: direct U.S. territory sales representatives handling enterprise and custom OEM projects, plus a global distribution network that includes RS, Digi-Key, Mouser, McMaster-Carr, Fastenal, Newark, Century Fasteners, Peerless Electronics, Wesco Aircraft (Zodiac), and Heilind, alongside regional distributors in 25+ countries. Pricing is quote-based and not publicly disclosed; the funnel is supported by content marketing (blog, eBooks, YouTube, social), inbound 'Ask the Experts' and Quick Quote Request forms, custom-design prototyping services, and trade-show participation including a 2026 schedule. Certifications include ISO 9001:2015, UL Recognized Component status (files E153680 and E210026), NASM 82496 in-house pressure and time testing, RoHS, REACH, Dodd-Frank conflict minerals, California Proposition 65, and Stockholm Convention POPs compliance.

Name

APM Hexseal

Legal name

APM Hexseal Corporation

Website

https://apmhexseal.com

Company type

Private

Founded year

1947

Operating status

Operating

Headcount range

11–50 employees

Short description

APM Hexseal is a privately held U.S. manufacturer, founded in 1947 in Englewood, New Jersey, that designs and produces elastomeric sealing boots for switches and circuit breakers plus self-sealing threaded fasteners, serving defense, aerospace, marine, medical, and industrial OEMs through a global distributor and direct sales network.

Ownership category

akta.pro rank

Headquarters

HQ city

Englewood Cliffs

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Personnel, Technology or R&D, Marketing or Sales

Revenue model

1. Sealing Products Sales: APM Hexseal generates revenue through the sale of sealing boots, bushings, and sealing hardware products. The product line includes toggle boots, pushbutton boots, rotary boots, circuit breaker boots, rocker boots, bushing seals, Seelskrews, Seelbolts, Seelnuts, Nutzilla, and Seeloc washers. Products are sold directly and through an extensive global distributor network.

Go-to-market motion2 records

Distribution channels10 records

Marketing channels9 records

Core offering

APM Hexseal manufactures environmental sealing products including molded silicone sealing boots for toggle, pushbutton, rotary, rocker, and circuit breaker switches, plus self-sealing fasteners (Seelskrews, Seelbolts, Seelnuts, Nutzilla) and Seeloc washers. All products are milled, mixed, and molded on-site at the New Jersey facility, with the company holding over 100 patents for its sealing innovations dating to 1947.

Product overview

APM Hexseal is a manufacturer of environmental sealing solutions for electrical and electronic equipment, operating since 1947. The product portfolio consists of two main categories: Sealing Boots & Bushings (including Toggle Boots, Pushbutton Boots, Rotary Boots, Circuit Breaker Boots, Rocker Boots, Bushing Seals, and Illuma-Boots) that protect switches and control panels from environmental contaminants, and Sealing Hardware (including Seelskrews®, Seelbolts®, Seelnuts®, Nutzilla, Seeloc® Washers, and Sealing Socket Head Cap Screws) that provide self-sealing fasteners with embedded O-ring technology. All products are manufactured in the company's New Jersey facility.

Differentiator

Problem solved

Functional benefit

Brands

• Seelskrews: Self-sealing screws - the company's first patented self-sealing fasteners and trademarked products
• Seelbolts
• Seelnuts
• Seeloc Washers
• Nutzilla
• RUBRGLAS
• Illuma-Boots
• IQ Toggle Boot
• Ultra Flex

Products and services

• Toggle Boots Molded silicone covers that protect toggle switches from environmental contaminants including salt, wind, water, and dust while allowing the switch to actuate freely. Available in full and half/open configurations with IQ quick-install technology.
• Pushbutton Boots Sealing boots designed to protect pushbutton switches from harsh environments, complying with MIL-DTL-5423 specifications. Available with hex-shaped or round inserts.
• Rotary Boots

Quantifiable outcome

• Sealing boots rated for 100,000+ actuations under extreme conditions
• +3 more outcomes

Named customers5 records

Segments12 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Trelleborg Sealing Solutions: Specialty manufacturer of engineered polymer seals, O-rings, and elastomer components for aerospace, defense, medical, and industrial customers. Closely comparable to APM Hexseal in core elastomer-sealing technology and end-market exposure.
• Greene Tweed: Manufacturer of high-performance elastomer seals, gaskets, and engineered components for aerospace, defense, semiconductor, and industrial applications. Directly comparable specialty elastomer manufacturer with similar MIL-SPEC and regulated-industry focus.
• Bal Seal Engineering: Specialty manufacturer of precision seals, springs, and conductive contacts used in medical, aerospace, defense, and industrial applications. Comparable in scale, specialty positioning, and engineered-elastomer product philosophy.
• Southco: Global manufacturer of engineered access hardware, latches, fasteners, and sealing solutions for industrial and transportation OEMs. Directly comparable in self-sealing fasteners and panel-level sealing products serving similar industrial/defense customers.
• Marco Rubber & Plastics: Custom rubber molding and sealing solutions provider serving aerospace, defense, medical, and industrial markets. Comparable in custom elastomer sealing, O-ring manufacturing, and engineered molded components.
• Apple Rubber Products: Manufacturer of standard and custom rubber seals, O-rings, and molded elastomer components for industrial, aerospace, and medical applications. Comparable specialty sealing manufacturer with overlapping customer base.

Broad incumbents

• Parker Hannifin: Diversified motion and control technologies leader with a large sealing group (O-rings, gaskets, EMI shielding) serving aerospace, defense, and industrial OEMs. Operates broadly across the same end markets as APM Hexseal, with overlapping products but at much larger scale.
• Bossard Group: Global fastener and assembly technology specialist serving industrial, electronics, and transportation OEMs. Comparable in the self-sealing fastener and Seelskrews-style product category, with much larger scale and broader catalog.
• ITW (Illinois Tool Works): Diversified industrial manufacturer with multiple fastener, sealing, and component divisions serving automotive, aerospace, and industrial customers. Comparable in fasteners and engineered sealing components, with vastly larger scale and R&D resources.

Emerging players

• Fluorocarbon Company: UK-based manufacturer of high-performance PTFE and elastomer seals, gaskets, and machined components for aerospace, defense, and industrial markets. Comparable in engineered-seal technology and end-market overlap, primarily European.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xtwitter.com/apmhexseal
• YouTubeyoutube.com/user/apmhexseal
• LinkedInlinkedin.com/company/apm-hexseal
• Instagraminstagram.com/apmhexseal
• TikToktiktok.com/@apmhexseal

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about APM Hexseal