What Engineered Inserts & Systems does

Engineered Inserts & Systems, Inc. (d/b/a EIS Inserts) is a privately held specialty manufacturer founded in 1988 and headquartered in Milford, Connecticut. The company designs and sells all-metal expansion plugs and related sealing components used to permanently plug and seal auxiliary construction holes in pneumatic and hydraulic systems. Its core technology is a one-piece assembly in which an expander ball is driven into a plug sleeve, creating independent sealing rings that anchor into the housing material, with rated blowout pressure exceeding 40,000 psi and a product range spanning 0.093"-0.875" (3mm-22mm) diameters across steel, stainless steel, and aluminum variants.

The company offers six series of ball expansion plugs (EIS-11/31/33/34/53/88), rivet plugs, pullplugs (RST, LRST), tapered plugs, precision flow control restrictors, SAE threaded port plugs including 'No Leak' variants, expansion and poppet check valves, sintered vents, filter screens, and installation tooling (air hammer and hand setting tools). Revenue is generated through direct, quote-based hardware sales to OEMs in fluid power, automotive, aerospace, and industrial/machine tool applications. Go-to-market is sales-led via phone and email, supported by downloadable PDF technical specifications and CAD documentation on the company website. Pricing is not publicly disclosed; special sizes, materials, and automated installation systems are available on request.

The business is differentiated by a substantial patent portfolio (20+ granted US and international patents covering manifold plug installation, single-piece expansion sealing, calibrated metering orifices, and high-pressure plugs) and by IATF 16949:2016 and AS9100D quality certifications that qualify EIS for automotive and aerospace supply chains. The company operates as a closely-held, self-funded entity with no disclosed institutional investors, no subsidiaries, and a single U.S. headquarters location, serving global markets through direct sales.

Name

Engineered Inserts & Systems

Legal name

Engineered Inserts and Systems, Inc.

Website

https://eisinserts.com

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

11–50 employees

Short description

Engineered Inserts & Systems (EIS Inserts) is a privately held Milford, Connecticut-based manufacturer of all-metal expansion plugs, pullplugs, precision flow restrictors, and SAE threaded port plugs serving fluid power, automotive, aerospace, and industrial OEMs. The company sells direct via quote-based pricing and holds IATF 16949 and AS9100 certifications.

Ownership category

akta.pro rank

Product category

Industrial Sealing Components

NAICS

Other Metal Valve and Pipe Fitting Manufacturing (332919), Fluid Power Valve and Hose Fitting Manufacturing (332912)

SIC

Gaskets, Packg & Sealg Devices & Rubber & Plastics Hose (3050)

akta.pro primary industry

Closure Components & Inserts (Orifices, Plugs, Gaskets, Balls) (IMALALAN)

akta.pro secondary industry

Seals, Gaskets & Fluid Connectors (O-rings, packings, rotary seals, quick couplers) (IMAHAGAI)

Keywords

• Metal expansion plugs
• Sealing components
• Hydraulic sealing solutions
• Precision flow control
• Threaded port plugs

Headquarters

HQ city

Milford

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Metal Expansion Plugs and Sealing Products: Sale of expansion plugs, rivet plugs, pullplugs, tapered plugs, and related sealing products in various materials (steel, stainless steel, aluminum) and configurations (metric, inch, inch short).
2. Precision Flow Control Restrictors: Sale of calibrated restrictions and flow control restrictors including press-in, threaded, and orifice plate designs.
3. Check Valves and Fluid Control Components: Sale of expansion check valves and poppet threaded check valves for forward and reverse flow direction applications.
4. Installation Equipment: Sale of installation tools including EIS-AH Series Air Hammer Setting Tools and EIS-HT Series Hand Setting Tools, as well as fully automated installation systems.
5. Custom/Special Size Products: Special sizes and materials available upon request, including custom automated installation equipment for volume applications.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels2 records

Core offering

Engineered Inserts & Systems (EIS Inserts) manufactures all-metal expansion plugs and sealing products used to permanently plug and seal auxiliary construction holes in pneumatic and hydraulic components. The portfolio includes ball expansion plugs, rivet plugs, pullplugs, tapered plugs, blocker plugs, precision flow control restrictors, SAE threaded port plugs, check valves, sintered vents, filter screens, and installation tooling. The company serves fluid power, automotive, aerospace, industrial, and machine tool applications with a blowout pressure rating exceeding 40,000 psi and no tapping or reaming required.

Product overview

Engineered Inserts & Systems (EIS) offers a comprehensive portfolio of metal expansion plugs and sealing solutions for fluid power, automotive, industrial, aerospace, and machine tool applications. The core product line consists of six series of Ball Expansion Plugs (EIS-11, EIS-31, EIS-33, EIS-34, EIS-53, EIS-88) available in steel, stainless steel, and aluminum materials with various plug/ball combinations, ranging from 3mm to 22mm diameters. Supporting products include EIS-RS Rivet Plugs, EIS-RST and EIS-LRST PULLPLUGS, EIS-LB Tapered Plugs, and EIS-B Blocker Plugs. The company also provides Precision Flow Control Restrictors (Expansion, Threaded, RSO, and LRSO series), SAE/Threaded Port Plugs including "No Leak" variants, Expansion and Poppet Threaded Check Valves, Sintered Vents, and Filter Screens. Installation is supported through EIS-AH Series Air Hammer and EIS-HT Series Hand Setting Tools. Key differentiators include blowout pressure exceeding 40,000 psi, no tapping or reaming required, and all-metal single-piece construction. The company holds multiple patents covering manifold plug installation systems, single-piece expansion sealing plugs, inserts for tapped holes, calibrated metering orifices, and high-pressure plugs.

Differentiator

Problem solved

Functional benefit

Brands

• PULLPLUGS: EIS-RST and EIS-LRST pull plugs for quick installation into drilled holes
• LB Tapered Plug
• SAE No Leak Plugs

Products and services

• Ball Expansion Plugs (EIS-11, EIS-31, EIS-33, EIS-34, EIS-53, EIS-88) All-metal, single-piece ball expansion plugs used to permanently plug and seal auxiliary construction holes in pneumatic and hydraulic components. Available in six material combinations (steel/steel, stainless steel/steel, stainless steel/stainless steel, aluminum/stainless steel, 316 stainless steel) and three size series (Metric, Inch, Inch Short) ranging from 0.093" to 0.875" (3mm to 22mm) diameters. Designed for fluid power, automotive, aerospace, industrial, and machine tool manufacturers.
• EIS-RS Rivet Plugs Rivet expansion plugs designed for installation into as-drilled holes of 4mm to 10mm diameter. Available in two standard lengths for industrial sealing applications.
• EIS-RST PULLPLUGS Patent-protected pull-type plugs available in stainless steel, steel, and aluminum materials. Quickly install into any depth in as-drilled holes, eliminating the need for tapping, reaming, or sealants. Many sizes and materials available for industrial and fluid power applications.
• EIS-LRST Low Pressure PULLPLUGS Patent-protected low pressure pullplugs available in stainless steel, steel, and aluminum materials. Designed for low-pressure sealing applications in as-drilled holes.
• EIS-LB Tapered Plug Tapered plug design that quickly installs into any depth in as-drilled or as-cast holes. Available in stainless steel, steel, and aluminum materials for low-pressure applications.
• EIS-B Blocker/Tapered Sealing Plug Low pressure press-in plug designed for as-cast holes with press-in and stake installation. Covered by US Patents 10,751,967 and 10,940,661. Special sizes and materials available upon request.
• Precision Flow Control Restrictors (Expansion, Threaded, RSO, LRSO series) Calibrated precision flow control restrictors for metering applications. Available in press-in (expansion), threaded, and orifice plate designs. Orifice sizes range from 0.004" and larger. Includes EIS-RSO (US Patent 10,859,105) and EIS-LRSO metric series variants. Filter screens and flow testing available.
• SAE/Threaded Port Plugs Threaded port plugs manufactured per SAE-J1926-1 specifications. Available in -2 to -24 sizes for hydraulic and pneumatic system port sealing.
• SAE "No Leak"/Threaded Port Plugs Threaded port plugs manufactured per SAE-J1926-1 specifications with redundant O-ring and metal seals to ensure leak-free sealing. Available in -2 to -24 sizes for critical hydraulic and pneumatic port applications.
• EIS Expansion Check Valve Expansion-type check valve available in 5.5mm and 8.0mm diameters. Supports both forward and reverse flow direction applications. Optional filter screens and flow testing available.
• Poppet Threaded Check Valve Poppet-design threaded check valve offering a high flow-to-size ratio. Available in -2 to -12 sizes for hydraulic and pneumatic fluid control applications.
• EIS Sintered Vents Sintered vent products available in a wide range of thread sizes. Manufactured in stainless steel and bronze materials for pressure equalization and breather applications.
• EIS Filter Screens Filter screens designed for last-chance contamination protection in fluid systems. Available in threaded and press-in installation styles.
• EIS Installation Tools (AH Series Air Hammer and HT Series Hand Setting Tools) Installation tooling line for setting EIS plug products, including EIS-AH Series Air Hammer Setting Tools for automated installation and EIS-HT Series Hand Setting Tools for manual installation. Fully automated installation systems available for volume applications.

Quantifiable outcome

• Blowout pressure exceeds 40,000 psi
• +3 more outcomes

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• AVK Industrial Products: AVK manufactures a comparable line of expansion plugs, sealing plugs, and threaded port plugs used in fluid power, automotive, and industrial applications — a direct product-line and customer-base overlap with EIS.
• Brennan Industries: Brennan produces hydraulic fittings, adapters, and threaded port plugs serving fluid power OEMs — overlapping with EIS's SAE J1926 threaded port plug and check valve lines.
• Böllhoff: Böllhoff manufactures specialty fastening and assembly technology including sealing plugs and threaded inserts for industrial and automotive applications, comparable to EIS's expansion and pullplug product families.
• Heyco Products: Heyco manufactures specialty metal and plastic components including sealing plugs and bushings for fluid power and industrial applications, with comparable product and customer profiles.

Broad incumbents

• Trelleborg Sealing Solutions: Trelleborg is a global leader in polymer and metal sealing components for fluid power and aerospace — a much larger incumbent with overlapping plug and sealing product categories.
• Parker Hannifin: Parker's Fluid Power division offers a broad portfolio of sealing plugs, fittings, and threaded port components — competing with EIS across fluid power, automotive, and aerospace end markets.
• Eaton: Eaton's Industrial and Aerospace divisions sell hydraulic/pneumatic sealing and port components into the same OEM customers EIS serves, making it a relevant broad incumbent competitor.

Emerging players

• Keystone Electronics: Keystone produces precision metal components including sealing and port plugs, serving industrial and electronic OEMs with a comparable niche-product focus.

Regional players

• Lee Spring: Lee Spring is a US-based specialty component manufacturer serving industrial OEMs with a catalog model — comparable in sales-motion and customer profile, though its core product is springs rather than plugs.

Others

• McMaster-Carr: McMaster-Carr is a major US industrial catalog distributor that resells competitors' sealing plugs, threaded port plugs, and similar components — an indirect channel competitor and reference-point for end-customer pricing.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/EISinserts

Compliance2 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 Engineered Inserts & Systems