What Triangle Suspension Systems Inc does

Triangle Suspension Systems Inc is a DuBois, Pennsylvania-based manufacturer and distributor of heavy, medium, and light duty truck and trailer undercarriage components, operating as a wholly owned subsidiary of Marmon Highway Technologies (Marmon / Berkshire Hathaway). Founded in 1919 in Pittsburgh and relocated to DuBois in 1927, the company sells three flagship product lines — FLAGG Suspension Parts (over 7,000 SKUs of steering and suspension components), Triangle Leaf Springs (USA-manufactured multi-leaf, parabolic, air beam, helper, and custom-engineered springs), and Continental ContiTech Air Springs (distributed under a 3-year / 300,000-mile warranty) — supported by Watson & Chalin Alignment & Service Kits and proprietary Spring Repair Material.

The company's core technology is the WebSST electronic catalog, a cloud-based, login-protected parts database with patented search software that enables distributors to cross-reference springs, suspension parts, and air springs by part number, rubber bellows number, visual selection, or dimensions, available 24/7/365. Manufacturing is anchored in an ISO 9001:2015 certified DuBois, PA facility running Lean Manufacturing and Continuous Improvement Kaizen processes, with proprietary water-based, low-VOC corrosion-resistant coatings delivering three times the corrosion resistance of prior formulations.

Triangle makes money almost entirely through B2B hardware sales: distributing its own manufactured products plus distributed lines (ContiTech, Hendrickson Genuine Parts, Watson & Chalin) through a nationwide network of over 1,400 distributor locations and dedicated OES Aftermarket regional territory managers covering Western, North Central, Eastern, and Central US regions. Pricing is quote-based and distributed via the WebSST portal, with same-day shipping on stock orders placed by 3PM EST. Customers include independent aftermarket distributors, OEM vehicle manufacturer service channels, and end fleets, with revenue concentrated in the heavy/medium duty commercial vehicle aftermarket, where the company cites a market growing at ~6% annually.

Name

Triangle Suspension Systems Inc

Legal name

Triangle Suspension Systems, Inc.

Website

https://triangleusa.com

Company type

Private

Founded year

1919

Operating status

Operating

Headcount range

11–50 employees

Short description

Triangle Suspension Systems Inc, a Marmon Highway Technologies/Berkshire Hathaway subsidiary founded in 1919, manufactures and distributes FLAGG suspension parts, Triangle leaf springs, and ContiTech air springs to a nationwide network of 1,400+ heavy, medium, and light duty truck and trailer distributors across North America.

Ownership category

akta.pro rank

Product category

Commercial Vehicle Suspension Parts

NAICS

Motor Vehicle Steering and Suspension Components (except Spring) Manufacturing (33633), Spring and Wire Product Manufacturing (33261)

SIC

Misc Industrial & Commercial Machinery & Equipment (3590)

akta.pro primary industry

Suspension Systems & Components (Springs/Shocks/Struts/Air Suspension) (IMACAIAA)

Keywords

• Heavy duty suspension parts
• Truck and trailer leaf springs
• Air spring distribution
• Undercarriage parts manufacturing
• Aftermarket suspension components

Headquarters

HQ city

Du Bois

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Hardware Sales — Aftermarket Suspension Parts: Sale of FLAGG suspension and steering parts, Triangle leaf springs, and distributed ContiTech air springs to a nationwide distributor network of over 1,400 locations. Customers include independent aftermarket distributors and fleet operators. Stock orders placed by 3PM ship the same day via UPS.
2. OES (Original Equipment Supplier) Aftermarket Sales: Direct sales of replacement suspension components to OEM vehicle manufacturers' aftermarket service channels, managed via dedicated regional territory managers for Western, North Central, Eastern, and Central US regions.
3. Licensed Product Distribution — Watson & Chalin: Distribution of Watson & Chalin Alignment and Service Kits (Trailer Air Standard/Eccentric Alignment Service Kit, Pivot Bushing Service Kit, alignment washers, etc.), expanding the suspension product catalog.
4. Distributor of Hendrickson Genuine Parts: Decades-long distribution relationship for Hendrickson Genuine Parts to the marketplace, augmenting Triangle's proprietary product offering.

Pricing tiers

Go-to-market motion4 records

Distribution channels7 records

Marketing channels7 records

Core offering

Triangle Suspension Systems designs, manufactures, and distributes undercarriage suspension parts for heavy, medium, and light duty trucks and trailers in North America. Its core offerings are the FLAGG line of 7,000+ suspension and steering parts, USA-manufactured Triangle Leaf Springs (multi-leaf, parabolic, air beams, helper, HD and custom-engineered), and distributed ContiTech air springs, all supported by the proprietary WebSST cloud-based electronic catalog and accessible through a nationwide network of 1,400+ distributor locations.

Product overview

Triangle Suspension Systems Inc. operates a unified undercarriage parts offering built around three flagship branded product lines — FLAGG Suspension Parts (the company's primary sub-brand covering over 7,000 suspension and steering SKUs), Triangle Leaf Springs (USA-manufactured leaf spring assemblies and repair material), and ContiTech Air Springs (distributed air springs). These product lines are supported and accessed by WebSST, Triangle's proprietary cloud-based electronic catalog that provides 24/7 cross-reference lookup, schematics, dimensional specifications, and ordering for distributors. Supplemental offerings include Custom Engineered Springs (engineered-to-order) and Spring Repair Material, and Triangle has more recently expanded into distributed alignment kits via Watson & Chalin Alignment & Service Kits. The product portfolio collectively targets heavy, medium, and light duty trucks and trailers across OEM applications.

Differentiator

Problem solved

Functional benefit

Brands

• FLAGG Suspension Parts: Triangle's flagship brand of over 7,000 suspension and steering parts (king pin sets, ball joints, tie rod ends, drag links, hangers, equalizers, bushings, torque rods, U-bolts, shock absorbers, etc.) for heavy, medium, and light duty trucks and trailers, with heavy-duty versions available for severe applications.
• Triangle Leaf Spring

Products and services

• FLAGG Suspension Parts Triangle's flagship suspension and steering parts line, offering over 7,000 SKUs covering front end components (king pin sets, ball joints, tie rod ends, drag links), leaf spring components (eye bolts and pins, spring pin bushings, center bolts and hardware, shackle kits), and suspension components (hangers, equalizers, beams, rubber seats, bushings, axle wedges, torque rods, Hendrickson Ultra rods, fasteners, U-Bolts and U-Bolt kits, shock absorbers, threaded rod, trunnion stands). Heavy-duty variants (rubber bushings, heavy-duty torque rods, bronze king pin bushings) are engineered to withstand loads up to 40% heavier than standard.
• Triangle Leaf Springs USA-manufactured steel leaf spring assemblies and spring repair material for heavy, medium, and light duty trucks and trailers, backed by nearly 100 years of design and manufacturing experience. Includes multi-leaf, parabolic, air beam, helper, and HD spring options plus custom engineered springs manufactured to OE or aftermarket specifications. A new proprietary water-based corrosion-resistant coating (launched 2018-10) provides three times the corrosion resistance over the prior coating, is low-VOC and Proposition 65 compliant.
• ContiTech Air Springs Continental ContiTech air springs distributed by Triangle Suspension Systems under a 3-year/300,000-mile warranty. Designed to adapt to varying load conditions, the air springs enhance ride comfort by up to 25% and reduce wear, leading to lower maintenance costs and prolonged vehicle life. Triangles WebSST patented software enables location of the right ContiTech air spring by rubber bellows number, visual selection, or dimensions.
• WebSST Electronic Catalog Triangles proprietary cloud-based electronic catalog providing 24/7/365 access to images, schematic drawings, dimensional specifications, and cross references on thousands of part numbers across Springs, Suspension Parts, and Air Springs. Includes patented search software for locating replacement ContiTech air springs by rubber bellows number, visual selection, or simple dimensions, with continually updated part-number interchanges, product line guides, Specials, Enhanced Searches (application schematics), Product Additions, and Tech Info.
• Spring Repair Material Companion product line to Triangle Leaf Springs, including repair plates, single leaves, clip material, and spring clips for spring repair work on heavy, medium, and light duty trucks and trailers.
• Custom Engineered Springs Custom-engineered springs designed and manufactured to customer specifications to fill niche needs beyond Triangles standard heavy, medium, and light duty offerings. Triangles engineers can spec and design answers for unique application problems, manufactured to OE or aftermarket specifications.
• Watson & Chalin Alignment & Service Kits Watson & Chalin alignment and service kits offered by Triangle, including Model Trailer Air Standard or Eccentric Alignment Service Kit, Model Trailer Air Standard or High Control Pivot Bushing Service Kit, Pivot Bushing or Axle Connection Bushing, and Trailer Air Eccentric or Standard Alignment Washer. Targets trailer suspension service needs through Triangles nationwide distributor network.

Quantifiable outcome

• FLAGG Suspension Parts withstand loads up to 40% heavier than standard options, improving vehicle stability and safety.
• +4 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Six partnerships are on record, tiered flagship and core.

• HendricksonflagshipStrategic or Co-development PartnerDecades-long strategic partnership for the distribution of Hendrickson Genuine Parts to the heavy-duty aftermarket through Triangle's nationwide distributor network of 1,400+ locations. Hendrickson Ultra rods are listed among Triangle's FLAGG product line. Quoted by David McCleave of Hendrickson on the homepage.
• Continental ContiTechflagshipChannel Partner/ Reseller/ DistributorTriangle distributes Continental ContiTech air springs — described as one of the largest and most respected names in the air spring business worldwide — under a 3-year/300,000-mile warranty. ContiTech supplies R&D expertise to engineer world-class products; Triangle handles North American distribution through its 1,400+ distributor network.
• Watson & ChalincoreOEM/ Whitelabel/ Licensing PartnerTriangle now offers Watson & Chalin Alignment and Service Kits (Trailer Air Standard or Eccentric Alignment Service Kit, Pivot Bushing Service Kit, Pivot Bushing/Axle Connection Bushing, Trailer Air Eccentric or Standard Alignment Washer). Announced Feb 14, 2018.
• Heavy Duty Aftermarket Week (HDAW)coreGTM or Marketing PartnerTriangle participates as an exhibitor at HDAW (held in Grapevine, TX for 2025) to showcase FLAGG Suspension Parts, Triangle Leaf Springs, and ContiTech Air Springs to industry leaders and professionals.
• Inland Truck PartscoreChannel Partner/ Reseller/ DistributorEmployee-owned (since 1944) regional distributor covering the Great Plains and Midwest; recipient of Triangle's "Distributor of the Year" award in 2019 for offering Triangle's quality spring, suspension and air spring products with fast turnaround. Greg Mundy is Purchasing Manager.
• State Spring & AlignmentcoreChannel Partner/ Reseller/ Distributor95-year-old family-owned service center with two locations in Grand Rapids and Lansing, MI; recipient of Triangle's "Service Center of the Year" award in 2019. Provides replacement and aftermarket spring/suspension parts, brakes, alignments, and DOT inspections in West Michigan. Led by Rick Sheehan, President.

Scale indicators12 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Hendrickson: Hendrickson is a major manufacturer of heavy-duty suspension systems and is also a Triangle distribution partner. Both serve the same heavy/medium duty truck and trailer OEM and aftermarket channels with overlapping suspension and undercarriage product lines, making them the most direct peer.
• SAF-Holland: SAF-Holland is a leading manufacturer of trailer suspension, axle, and chassis components, directly overlapping with Triangle's trailer suspension, axle, and undercarriage parts portfolio serving commercial vehicle OEM and aftermarket customers.
• Meritor: Meritor (now part of Cummins) is a major manufacturer of drivetrain, axle, and suspension components for commercial vehicles, serving the same heavy-duty OEM and aftermarket customers as Triangle with overlapping product categories.
• Dana Incorporated: Dana is a global manufacturer of driveline and motion products, including axles and suspension components for commercial vehicles. Dana/Spicer is explicitly named as an OEM application covered by Triangle, indicating direct overlap in target customer and product category.
• Reyco Granning (Transpro / Reyco): Reyco Granning is a manufacturer of suspension systems for trucks, trailers, and specialty vehicles. Reyco/Transpro is listed as an OEM Triangle covers, and the product portfolios directly overlap in air ride and mechanical suspensions for commercial applications.
• Ridewell Suspensions: Ridewell designs and manufactures suspensions and lift axles for trucks, trailers, buses, and specialty vehicles, directly comparable to Triangle's air spring and heavy-duty suspension offerings for vocational and transit applications.
• Neway / Holland (SAF-Holland subsidiary): Neway/Holland is a long-established manufacturer of air ride suspensions for trucks, trailers, and buses. Neway is explicitly listed as an OEM application covered by Triangle, and product lines overlap directly in air suspensions for commercial vehicles.
• Watson & Chalin (a JOST brand): Watson & Chalin manufactures trailer air suspensions, lift axles, and alignment components, and is both a Triangle partner (alignment/service kits) and a direct peer in the trailer air suspension segment.

Broad incumbents

• Continental ContiTech: Continental ContiTech is a global manufacturer of air springs and rubber products, and is both a Triangle distribution partner and a broader incumbent whose air spring technology underlies Triangle's distributed product line. Comparable as a major upstream supplier and competitor in the air spring category.

Emerging players

• Stemco (a Wabash National brand): Stemco, which acquired Kaiser, manufactures heavy-duty suspension and wheel-end components; Ryan Rogers (now Triangle's Product Development Manager) previously spent 14 years in sales and support for the suspension product line at STEMCO/Kaiser, underscoring the direct overlap with Triangle's FLAGG product line.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/triangle-suspension-systems-inc

Compliance1 record

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 Triangle Suspension Systems Inc