Le Sueur Incorporated
Le Sueur Incorporated is a U.S. contract manufacturer of complex and pressure-tight aluminum castings and plastic injection molded components, serving 130+ industrial customers across transportation, defense, medical, power generation, agriculture, and EV markets with vertically integrated casting, machining, and assembly services.
- Company typePrivate
- Founded1946
- HeadquartersLe Sueur, United States
- Headcount251–500
- GTM typeB2B
- OfferingHardware or Manufacturing
What Le Sueur Incorporated does
Le Sueur Incorporated (LSI), headquartered in Le Sueur, Minnesota, is a vertically integrated U.S. contract manufacturer specializing in complex and pressure-tight aluminum castings and plastic injection molded components. Founded in 1946 as Le Sueur Foundry Company and renamed in 1991, the company operates over 274,000 square feet of manufacturing space and serves more than 130 customers across nine primary verticals: transportation (rail, HD/MD trucks, specialty automotive, EV), pumps and fluid handling, recreation (marine, snowmobile, ATV, motorcycle, RV), defense (ITAR-registered), agriculture and heavy equipment, power generation, electric motors, and medical.
The company's core offerings span multiple casting processes — Low Pressure Permanent Mold, Gravity Pour / Tilt Pour Permanent Mold, automated and Cope & Drag sand casting, and high-pressure die casting (250 to 1,600 ton clamp) — alongside 32 plastic injection molding machines (25 to 500 ton) supporting two-shot overmolding and insert molding. Underlying technical differentiators include proprietary Squeeze Pin Technology and Vacuum Assist die casting methods for leak-free components, MAGMASOFT-certified casting simulation for upfront design optimization (Autonomous Optimization / virtual DOE), and Visi-Trak process monitoring on all die casting work cells. In-house finishing capabilities include CNC horizontal and vertical machining, CNC turning with live tooling, heat treatment (T5/T51/T6/T61/T7/T71 across five ovens), metallurgical and NDT laboratories, multi-method X-ray inspection (DR, CR, Film), air decay leak testing, and an array of value-added assembly operations.
LSI generates revenue through project-based custom manufacturing contracts awarded via direct enterprise sales and an RFQ-driven sales motion, with dedicated engineering support for design-for-manufacturability. The company pursues a turnkey model delivering machined, tested, heat-treated, and assembled sub-components — not raw castings. Following its 2022 acquisition by Delos Capital and The Silverfern Group, LSI acquired Craft Pattern and Mold in December 2023 (adding rapid prototyping) and announced an LPPM capacity expansion in April 2024. Certifications include ISO 9001:2015, ISO 14001:2015, ITAR registration, and UL certification.
Le Sueur Incorporated firmographics
Firmographics- Name
- Le Sueur Incorporated
- Legal name
- Le Sueur Incorporated
- Website
- https://lesueurinc.com
- Company type
- Private
- Founded year
- 1946
- Operating status
- Operating
- Headcount range
- 251–500 employees
- Short description
- Le Sueur Incorporated is a U.S. contract manufacturer of complex and pressure-tight aluminum castings and plastic injection molded components, serving 130+ industrial customers across transportation, defense, medical, power generation, agriculture, and EV markets with vertically integrated casting, machining, and assembly services.
- Ownership category
- akta.pro rank
Le Sueur Incorporated industry classification
Industry- Product category
- Industrial Castings and Molded Components
- NAICS
- Nonferrous Metal Die-Casting Foundries (331523), Aluminum Foundries (except Die-Casting) (331524)
- SIC
- Nonferrous Foundries (Castings) (3360)
- akta.pro primary industry
- Custom Injection Molding & Contract Manufacturing (Job Shops/CMs) (IMANAFAJ)
Keywords
Where Le Sueur Incorporated is headquartered
LocationHeadquarters
- HQ city
- Le Sueur
- HQ country
- United States
- HQ region
- North America
Offices2 records
Markets served
Le Sueur Incorporated business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Operations, Supply Chain, Personnel, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- Aluminum Casting Manufacturing: Custom aluminum castings produced using Permanent Mold, Sand Casting, and Die Casting processes. Revenue is generated through project-based manufacturing contracts where customers provide specifications and LSI produces cast components to order. The company offers unbiased recommendations for the most effective casting process based on customer requirements.
- Plastic Injection Molding: Custom plastic injection molding services including Two-Shot Overmolding and Insert Molding. Services 32 plastic injection molding machines ranging from 25 tons to 500 tons. Revenue generated through custom manufacturing contracts.
- Precision Machining Services: Complete in-house horizontal and vertical CNC machining, CNC turning with live tooling, and air decay leak testing services. Provides finished, ready-to-use products including machining, finishing, and assembly.
Go-to-market motion2 records
Distribution channels1 record
Marketing channels5 records
Le Sueur Incorporated product offering
Product offeringCore offering
Le Sueur Incorporated is a vertically integrated manufacturer of custom aluminum castings and plastic injection molded components for industrial customers. The company operates three aluminum casting processes — permanent mold, sand casting, and die casting — alongside plastic injection molding, precision CNC machining, heat treatment, finishing, and assembly, all delivered from a single 274,000+ sq ft facility in Le Sueur, Minnesota.
Product overview
Le Sueur Incorporated is a vertically integrated supplier of complex castings and molded components, offering multiple aluminum casting processes (permanent mold, sand casting, and die casting) alongside plastic injection molding. The company operates over 274,000 square feet of manufacturing space with precision machining, quality control, heat treatment, and engineering support capabilities performed in-house. The portfolio includes core manufacturing processes (Aluminum Sand Casting, Permanent Mold Casting, Aluminum Die Casting, Plastic Injection Molding) complemented by value-added services (Precision Machining, X-Ray Inspection, Metallurgical/NDT Labs, Heat Treatment, Engineering Support, and Value Added Services). In December 2023, LSI acquired Craft Pattern and Mold to expand into rapid prototyping services.
Differentiator
Problem solved
Functional benefit
Products and services
- Aluminum Sand Casting Green sand casting process using automatic molding and cope & drag methods to produce dimensionally complex and pressure-tight aluminum castings for transportation, medical, agriculture, and industrial markets.
- Permanent Mold Casting Aluminum permanent mold casting using reusable steel molds, including low pressure permanent mold (LPPM) and tilt pour/gravity pour processes, plus semi-permanent mold with sand cores for high structural integrity castings.
- Aluminum Die Casting High pressure aluminum die casting on 12 machines ranging from 250 to 1600 tons clamp capacity, featuring proprietary Squeeze Pin Technology and Vacuum Assist for leak-free, pressure-tight castings used in pumps, compressors, transmissions, and hydraulics.
- Plastic Injection Molding Full-service plastic injection molding across 32 machines (25-500 ton) supporting horizontal, vertical, insert molding, and two-shot molding processes with extensive secondary and value-added services.
- Precision Casting Machining Complete in-house horizontal and vertical CNC machining, CNC turning with live tooling, air decay leak testing, pressure testing, and assembly services for cast and molded components, delivered as finished ready-to-use parts.
Quantifiable outcome
- Over 77 years of manufacturing experience producing dimensionally complex, pressure tight aluminum castings
- +2 more outcomes
Companies that use Le Sueur Incorporated
Customer profileNamed customers9 records
Segments7 records
Ideal customer profiles3 records
Le Sueur Incorporated technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration3 records
Feature6 records
Le Sueur Incorporated partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Craft Pattern and MoldcoreCraft Pattern and Mold, based in Montrose, MN, was acquired by Le Sueur Incorporated on December 14, 2023. Craft specializes in rapid prototyping and complex metal and plastics components with over 30 years of industry experience. The acquisition expands LSI's capabilities and provides end-to-end service offerings for customers.
Scale indicators8 records
Recent moves6 records
Expansion highlights5 records
Le Sueur Incorporated competitors and assessment
Company assessmentMarket position
Competitive moat5 records
Key highlights6 records
Customer concentration
Le Sueur Incorporated social profiles
Digital presenceLe Sueur Incorporated compliance and trust
Trust signalCompliance4 records
Le Sueur Incorporated financial estimates
Financial estimateRevenue estimate
Valuation estimate
Le Sueur Incorporated leadership team
Management profileNumber of profiles
Profiles2 records
Le Sueur Incorporated subsidiaries and ownership
Company hierarchySubsidiaries1 record
Le Sueur Incorporated funding detail
Funding detailFunding overview
Funding rounds2 records
Investors2 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Le Sueur Incorporated M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Le Sueur Incorporated
What does Le Sueur Incorporated do?
Le Sueur Incorporated is a vertically integrated manufacturer of custom aluminum castings and plastic injection molded components for industrial customers. The company operates three aluminum casting processes — permanent mold, sand casting, and die casting — alongside plastic injection molding, precision CNC machining, heat treatment, finishing, and assembly, all delivered from a single 274,000+ sq ft facility in Le Sueur, Minnesota.
Is Le Sueur Incorporated a public or private company?
Le Sueur Incorporated is a private company. It is classified as private equity controlled and is currently operating.
When was Le Sueur Incorporated founded?
Le Sueur Incorporated was founded in 1946. It employs 251 to 500 people.
Where is Le Sueur Incorporated based?
Le Sueur Incorporated is headquartered in Le Sueur, United States, in the North America region.
How does Le Sueur Incorporated make money?
Three revenue lines are on record. Aluminum Casting Manufacturing is the primary driver. The others are plastic Injection Molding and precision Machining Services.
Does Le Sueur Incorporated have an API?
No public API is recorded for Le Sueur Incorporated.
What industry is Le Sueur Incorporated in?
Le Sueur Incorporated's product category is Industrial Castings and Molded Components. Its primary akta.pro industry code is IMANAFAJ, Custom Injection Molding & Contract Manufacturing (Job Shops/CMs). Its NAICS code is 331523 and its SIC code is 3360.