Stonite Coil

What Stonite Coil does

Stonite Coil Corporation is a privately held, family-owned designer and manufacturer of custom and production electrical coils, founded on February 10, 1950 in Trenton, New Jersey by former employees of the Electrical Coil Division of John A. Roebling & Sons Company. The company operates from a single, company-owned flagship manufacturing facility at 476 Route 156, Yardville, NJ 08620, where it produces coils ranging from a few ounces to 1,000 pounds using CNC Broomfield coil winding equipment, with vacuum impregnation capability up to 72 inches in diameter and transfer molding presses up to 50 tons. Its product portfolio spans layer wound, bobbin wound, form wound, freestanding, transfer molded, and vacuum impregnated coils, plus specialized variants for solenoid valves, actuators, inductors, transformers, electromagnets, degaussing, antenna, sensing, and linear motor applications, with wire gauges spanning 40 AWG to 4/0 AWG.

The company's go-to-market is sales-led, targeting engineering communities and supply planners through its website (stonitecoil.com), Request for Quote and Ask the Experts forms with 24-72 hour response times, and direct contact with named leadership including President William Engel and Vice President Scott Root. Pricing is entirely quote-based and not publicly disclosed, with revenue generated through one-time custom manufacturing orders and recurring managed-services revenue from custom inventory management and Kanban stocking programs. The company holds MIL-I-45208 and MIL-STD-45662A military specifications alongside UL, CE, TUV, FM, and CSA certifications, enabling participation in defense, industrial safety, and export-market supply chains.

Stonite Coil is led by President William Engel, Administrative Vice President Carol Engel, Vice President Scott Root, CFO Christopher Merrick, Director of Mechanical Engineering Alfred Montagna, Manager of Purchasing & Materials Joe Chenkus, and Administrative Associate Chris Engel, reflecting continued Engel-family involvement in leadership. The company states it is a major U.S. supplier of custom and production electrical coils with over 70 years of operating history, but does not disclose revenue, employee count beyond the 11-50 band, customer logos, or growth metrics, limiting third-party triangulation of scale. Recent product direction suggests modest evolution into instrumented components via its Smart Coil Technology line and in-house Automated Test Equipment, but the core business remains a stable, horizontally diversified custom coil manufacturer serving industrial and engineering buyers primarily in North America.

Name

Stonite Coil

Legal name

Stonite Coil Corporation

Website

https://stonitecoil.com

Company type

Private

Founded year

1950

Operating status

Operating

Headcount range

11–50 employees

Short description

Stonite Coil Corporation is a privately held, family-owned U.S. manufacturer of custom and production electrical coils founded in 1950, serving industrial and engineering customers with precision-wound coils, encapsulation, and managed inventory programs from its Yardville, New Jersey facility.

Ownership category

akta.pro rank

Product category

Custom Electrical Coil Manufacturing

SIC

Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

Inductors & Coils (Power/RF/Chokes) (HDAHANAC)

akta.pro secondary industry

Transformers & Magnetics (Power/Signal) (HDAHANAD)

Keywords

• Custom electrical coils
• Coil winding services
• Electromagnetic coil manufacturing
• Solenoid coil production
• Vacuum impregnated coils

Headquarters

HQ city

Trenton

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Custom Electrical Coil Manufacturing: Design, prototyping, and manufacturing of custom electrical coils ranging from 1000 pounds down to a few ounces. Turnkey production solutions from one to one million units.
2. Value-Added Services: Custom inventory management programs and Kanban stocking programs customized to customers' monthly, quarterly or yearly estimated usage. Warehousing, inventory and distribution management services.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Stonite Coil is a designer and manufacturer of custom and production electrical coils, producing coils ranging from a few ounces up to 1,000 pounds at its Yardville, New Jersey facility. The company provides turnkey production solutions from concept and design through prototyping, manufacturing, warehousing, inventory and distribution, serving solenoid valves, actuators, inductors, transformer coils, vibrator drives, linear motors, electromagnets and other electromagnetic applications. Order volumes range from one unit to one million units.

Product overview

Stonite Coil is a custom electrical coil manufacturer offering a comprehensive portfolio of precision-wound coils and related services. The core offering consists of custom electrical coils manufactured from 40 AWG to 4/0 AWG wire gauges, ranging from a few ounces to 1,000 pounds. The product line includes multiple coil variants (layer wound, bobbin wound, form wound, freestanding, transfer molded, vacuum impregnated) serving applications such as solenoid valves, actuators, inductors, transformers, vibrator drives, electromagnetic coils, and specialized coils including degaussing, antenna, sensing, and linear motor coils. Supporting services include smart coil technology with integrated sensing, automated test equipment, custom inventory management programs, and Kanban stocking programs. The company provides turnkey solutions from concept through design, prototyping, manufacturing, warehousing, and distribution management.

Differentiator

Problem solved

Functional benefit

Products and services

• Custom Electrical Coils Custom-designed and manufactured electrical coils ranging from a few ounces to 1,000 pounds, serving solenoid valves, actuators, inductors, transformer coils, vibrator drives, linear motors and electromagnetic applications. Production runs range from one unit to one million units, manufactured entirely in-house at the Yardville, NJ facility.
• Layer Wound Coils

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Mercer County Chamber of CommerceminorOthersStonite Coil is a member of the Mercer County Chamber of Commerce, providing networking and business development opportunities in the regional business community.

Scale indicators4 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Sag Harbor Industries: Custom manufacturer of coils, transformers, and inductors for industrial, military, and aerospace customers. Closely comparable niche custom magnetics manufacturer with MIL-spec exposure similar to Stonite.
• Coilcraft: Major manufacturer of inductors, transformers, and RF magnetics with broad catalog and custom capabilities. Overlaps with Stonite on inductor and choke products and serves similar electronics and industrial customers.
• Triad Magnetics: Designs and manufactures custom transformers, inductors, and chokes for industrial, audio, and power applications. Directly comparable to Stonite's custom coil and magnetics product lines and customer base of engineers and OEMs.
• Magnetic Component Engineering: Specializes in custom magnetics including coils, transformers, and inductors for demanding applications. Comparable niche custom magnetics manufacturer with overlapping customer use cases in industrial and scientific markets.

Broad incumbents

• Hammond Manufacturing: Manufactures transformers, enclosures, and related electrical components for industrial and electronics customers. Overlaps with Stonite's transformer coil and inductor offerings within a broader catalog.
• Bourns, Inc. Large electronic component manufacturer with magnetics, inductor, and coil product lines serving industrial, automotive, and communications markets. Comparable product categories though operating at significantly larger scale.
• Standex Electronics: Broader magnetics and reed switch portfolio serving industrial, automotive, and consumer markets. Overlaps with Stonite on custom coil/inductor work but at a larger scale and broader product mix.
• Sumida Corporation: Global manufacturer of inductors, transformers, and power magnetics for automotive and industrial customers. Comparable on inductor and transformer coil products though serving much higher-volume OEM programs.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/profile.php

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

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 Stonite Coil