What Seastrom Manufacturing does

Seastrom Manufacturing Co., Inc. is a privately held, family-owned precision manufacturer founded in 1928 by Wensil Seastrom in Glendale, California and now headquartered at a 100,000-square-foot facility in Twin Falls, Idaho. The company produces precision washers (metallic, non-metallic, military-spec AN/NAS/MS/M series, specialty, spherical, and spring configurations), laminated shims, and a broad range of assembly hardware (bus bars, clamps, brackets, solder lugs, spacers, retaining rings, Hiram Jones terminals). It stocks more than 60,000 part numbers and delivers most stocked items within 48 hours, operating a full in-house engineering, tool-and-die, and quality-control function. Two wholly-owned subsidiaries — Seastrom Stamping (precision and four-slide stamping, laser engraving, wire EDM, 3D printing) and Acacia Machining (CNC milling, turning, Swiss CNC, Davenport, water jet) — provide adjacent manufacturing capabilities.

The business operates a dual revenue model. Standard catalog products are sold directly through an e-commerce website with shopping-cart checkout, while custom-to-print parts are quoted via an online form or toll-free sales line (1-800-634-2356). Pricing is quote-based and not publicly disclosed, reflecting variability in raw-material costs and configuration. Go-to-market combines direct e-commerce (global reach), inside sales (toll-free phone), and a sales-led custom-engineering motion for enterprise customers. Primary end markets are Defense and Aerospace (where Seastrom is an approved supplier for most major aerospace and commercial manufacturers), with secondary positions in Medical, Energy, Electronics/Communications, Agriculture, Machinery, and Firearms. Certifications including ISO 9001:2015, AS9100 Rev.D, ITAR, DFARS, and RoHS are central to qualifying into aerospace, defense, and EU markets. The company has no public funding history, no disclosed revenue, and remains entirely family-owned with 51-100 employees.

Name

Seastrom Manufacturing

Legal name

Seastrom Manufacturing Co., Inc.

Website

https://seastrom-mfg.com

Company type

Private

Founded year

1928

Operating status

Operating

Headcount range

51–100 employees

Ownership category

akta.pro rank

Headquarters

HQ city

Twin Falls

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Standard Product Sales: Sale of standard stocked washers and precision assembly hardware from their catalog of 60,000+ part numbers. Products include metallic washers, non-metallic washers, military washers, pre-packaged washers, and assembly hardware components.
2. Custom Manufacturing Services: Custom engineering and manufacturing of parts to customer specifications. Services include custom washers, fasteners, and precision components manufactured to exact customer requirements with in-house engineering support.
3. Precision Stamping Services: Precision and compound stamping services through Seastrom Stamping subsidiary, including four-slide stamping and precision tooling.
4. CNC Machining Services: CNC machining services through Acacia Machining subsidiary, including milling, turning, Swiss CNC, Davenport, and water jet operations.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Seastrom Manufacturing is a full-service precision manufacturer of standard washers and assembly hardware, stocking more than 60,000 part numbers across metallic, non-metallic, military-spec (AN, NAS, MS, M series), and specialty washer categories. The company also offers custom engineering and contract manufacturing of parts to exact specifications, supported by two wholly-owned operating subsidiaries — Seastrom Stamping (precision and four-slide stamping, laser engraving, wire EDM) and Acacia Machining (CNC milling, turning, Swiss CNC, water jet).

Product overview

Seastrom Manufacturing is a full-service manufacturer and supplier of precision washers and precision assembly hardware, offering the most comprehensive online catalog of high-quality standard washers and specialty assembly hardware. The company stocks more than 60,000 part numbers across metallic washers (aluminum, brass, steel, stainless steel, titanium, beryllium copper, copper, phosphor bronze), non-metallic washers (PTFE, nylon, phenolic, PVC, neoprene, and more), military washers (AN, NAS, MS, M series), specialty washers (spherical, spring, locking, tab, retaining), laminated shims, and assembly hardware including bus bars, clamps, brackets, spacers, solder lugs, and Hiram Jones terminals. The company operates two subsidiaries: Seastrom Stamping (precision stamping, four-slide, laser engraving, wire EDM, 3D printing) and Acacia Machining (CNC machining, milling, turning, Swiss CNC, water jet). Custom engineering is available to manufacture new parts to exact specifications with short lead times.

Differentiator

Problem solved

Functional benefit

Brands

• Seastrom Stamping: Precision stamping subsidiary offering compound and progressive stamping, four slide, precision tooling and engineering, laser engraving, wire EDM, special packaging, and 3D printing services.
• Acacia Machining

Products and services

• Metallic Washers Precision washers manufactured from metals including aluminum, brass, beryllium copper, copper, phosphor bronze, steel, stainless steel, and titanium, supplied in multiple configurations to industrial manufacturers.
• Non-Metallic Washers Precision washers manufactured from non-metallic materials including acetal, fiberglass, fibre, kapton, mica, mylar, neoprene, nylatron, nylon, phenolic, polyethylene, polyurethane, PVC, and PTFE, for industrial buyers requiring non-conductive or specialty washers.
• Military Washers (AN, NAS, MS, M Series) Military-specification washers and hardware including AN, NAS, MS, and M series parts for defense and aerospace applications requiring mil-spec compliance.
• Laminated Shims Multi-layer laminated shims in aluminum, brass, stainless steel, and steel for precision adjustment and spacing applications.
• Spherical Washers Metric and standard spherical washers including DIN 6319 series, convex, concave, and spherical washer sets used for angular alignment in bolted assemblies.
• Spring Washers Spring washers including Belleville, crescent, wave, dome, and single wave styles for spring tension and vibration control in mechanical assemblies.
• Assembly Hardware Complete range of assembly hardware including bus bars, clamps, brackets, expansion plugs, flexible grounding straps, jumpers, push-on nuts, retaining rings, solder lugs, solid state insulators, spacers, spring clips, and tags.
• Military Hardware Military specification hardware parts including AN, M, MS, and NAS series for defense and aerospace applications.
• Hiram Jones Terminals Specialized terminals including bifurcated, crimp and ground, swage type, PTFE insulated assembled feed thru, standoff, press-type, test jack, and terminal studs for electronics and electrical assembly.
• Precision Stamping Services (Seastrom Stamping) Precision stamping, four-slide stamping, precision tooling and engineering, laser engraving, wire EDM, special packaging, and 3D printing services delivered through the Seastrom Stamping subsidiary.
• CNC Machining Services (Acacia Machining) CNC machining services including milling, turning, Swiss CNC, Davenport multi-spindle, and water jet capabilities delivered through the Acacia Machining subsidiary.
• Custom Manufacturing Custom engineering and manufacturing of new parts to exact customer specifications, including material selection, engineering design, and finished production, serving aerospace, military, and commercial manufacturers.

Quantifiable outcome

• 48-hour delivery on most stocked products
• +1 more outcomes

Named customers5 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Seastrom Stamping (Subsidiary)coreOthersSeastrom Stamping is a subsidiary company providing precision compound and progressive stamping services. The subsidiary operates as a separate business unit under the Seastrom family of companies, offering four-slide stamping, precision tooling and engineering, laser engraving, wire EDM, and special packaging capabilities.

Scale indicators4 records

Recent moves6 records

Expansion highlights3 records

Broad incumbents

• Würth Industry: Industrial division of the Würth Group, supplying fastening and assembly materials worldwide, including C-parts management for OEM production lines. Comparable on industrial fastening and assembly hardware supply to manufacturing customers, though much broader in scope.
• Fastenal Company: Industrial supply and fastener distributor with vending, on-site, and e-commerce channels serving manufacturing customers. Comparable on fasteners, washers, and assembly hardware SKUs supplied to industrial and aerospace manufacturers, though primarily as a distributor rather than a manufacturer.
• McMaster-Carr: Industrial catalog distributor with hundreds of thousands of SKUs across fasteners, washers, and hardware, with same-day shipping. Comparable to Seastrom in catalog breadth and 48-hour lead time positioning, but at dramatically larger scale and broader product scope.
• PennEngineering: Global manufacturer of precision engineered fasteners and installation tooling for automotive, electronics, aerospace, and industrial markets. Comparable on precision metal fastening and assembly hardware, though at much larger scale and with broader fastening focus than washers alone.
• Bossard Group: Global fastening solutions provider combining fastener manufacturing, engineering services, and Smart Factory logistics for industrial customers. Comparable on engineered fastening solutions and inventory-managed supply programs to manufacturing OEMs.
• Precision Castparts Corp. Aerospace and industrial components manufacturer (now part of Berkshire Hathaway) producing precision cast and machined parts for aerospace and defense primes. Comparable on aerospace/defense customer base and AS9100-quality precision components, though at vastly larger scale and scope.

Direct peers

• EFC International: Distributor and manufacturer of precision engineered fasteners, stampings, and plastic components serving automotive, industrial, and consumer OEMs. Comparable to Seastrom Stamping and Acacia Machining on custom stamped and machined precision components.
• Hardware Specialty Co. Specialty washer and stamped component manufacturer producing precision shims, spacers, and custom stampings. Direct comparable to Seastrom on specialty washer shapes, military/AS9100-style applications, and short-run custom stamping work.
• Boker's Inc. Precision washer and metal stamping manufacturer offering thousands of flat, spring, and specialty washer SKUs with custom stamping services. Closest direct analog to Seastrom's core washer-and-stamping business model.
• Misumi USA: Configurable industrial components catalog with strong e-commerce configurator and direct-ship model. Competes with Seastrom on standardized precision components, configurable part numbers, and online ordering for mechanical engineering buyers.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/seastrom-manufacturing-co-inc-

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries2 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 Seastrom Manufacturing