Stone Slinger

What Stone Slinger does

W.K. Dahms Mfg. Ltd., doing business as Stone Slinger, is a privately held, third-generation family-owned Canadian manufacturer of mobile aggregate placement equipment, founded in 1974 in St. Jacobs, Ontario. The company's flagship product, the Stone Slinger, was invented in 1976 by W. Keith Dahms and is defined by a high-speed outboard rear conveyor mounted directly onto a truck body, enabling precision placement of materials such as sand, soil, mulch, topsoil, and aggregate at distances up to 100-120 feet from the truck.

The product portfolio spans four core models — the Ultra (16/18/20 ft sizes), Ultra Pro (premium tier with Super-Shield Power Drive and Danfoss IK3/Plus1-CanBUS wireless remote), OS7 (self-propelled unit rated at up to 400 tons per shift with a 120 ft throw), and Mini Ultra (compact 10 yd³ unit for tight job sites) — supplemented by a Custom Solutions track offering Creep Drive remote maneuvering, a 40 yd³ High Capacity box, a Front Discharge configuration for utility trenching, and trailer-mounted variants. All products share the same underlying conveyor-on-truck architecture refined over five decades and serve end markets including construction, landscaping, road and highway construction, drainage projects, and power transmission/utility installation.

The company makes money primarily through built-to-order equipment sales at undisclosed price points, recurring aftermarket parts revenue supported by next-day North American delivery from an extensive parts inventory, and custom metal fabrication services leveraging its 21,000+ square foot St. Jacobs facility. Go-to-market is a tiered distribution model: direct manufacturer/dealer sales in Ontario paired with eight authorized regional distributors covering Western and Eastern Canada, four U.S. regions, the Netherlands, and South Africa. Customer acquisition is driven by the company's website (product pages, demonstration videos, contact-based lead capture) and the dealer network rather than digital marketing programs.

Name

Stone Slinger

Legal name

W.K. Dahms Mfg. Ltd.

Website

https://stoneslinger.com

Company type

Private

Founded year

1974

Operating status

Operating

Headcount range

11–50 employees

Short description

W.K. Dahms Mfg. Ltd. (Stone Slinger) is a third-generation, family-owned Canadian manufacturer of mobile aggregate placement equipment, selling built-to-order truck-mounted conveyor systems and aftermarket parts to construction, landscaping, and utility contractors across North America, Europe, and South Africa.

Ownership category

akta.pro rank

Product category

Construction Equipment - Mobile Aggregate Placement

NAICS

Material Handling Equipment Manufacturing (33392), Industrial Truck, Tractor, Trailer, and Stacker Machinery Manufacturing (333924)

SIC

Construction, Mining & Materials Handling Machinery & Equip (3530), Construction Machinery & Equip (3531)

akta.pro primary industry

Bulk Material Handling Systems (Belt Conveyors, Feeders, Stackers, Reclaimers) (IMAHABAH)

akta.pro secondary industry

Lifting Attachments & Material Handling Accessories (Fork Attachments, Slings, Rigging) (IMAHABAJ)

Keywords

• Mobile aggregate placement
• Truck-mounted conveyors
• Precision material delivery
• Construction equipment manufacturing
• Landscaping material handling

Headquarters

HQ city

Saint Jacobs

HQ country

Canada

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Stone Slinger Equipment Sales: Manufacture and sale of mobile aggregate placement equipment including Ultra, Ultra Pro, and OS7 models. Equipment is built to order with customization options for different sizes and chassis configurations.
2. Aftermarket Parts and Service: Parts sales with next-day delivery throughout North America for parts ordered by 2:00 p.m. from extensive parts inventory. Includes telephone technical support and service technician assistance.
3. Custom Fabrication Services: Metal fabrication services using 21,000+ square feet of manufacturing space with advanced technology and skilled team. Delivers tailored solutions in steel, aluminum, or stainless steel for custom projects.

Pricing tiers

Go-to-market motion1 record

Distribution channels9 records

Marketing channels2 records

Core offering

W.K. Dahms Mfg. Ltd. manufactures and sells the original Stone Slinger™, a truck-mounted mobile aggregate placement system featuring a high-speed outboard rear conveyor that precisely delivers materials such as sand, soil, mulch, topsoil, and pebbles up to 100–120 feet from the truck. Equipment is built to order in multiple models (Ultra, Ultra Pro, OS7, Mini Ultra) with custom configurations for construction, landscaping, road, drainage, and utility applications.

Product overview

W.K. Dahms Mfg. Ltd. is the world leader in mobile aggregate placement equipment, manufacturing the original Stone Slinger™ invented in 1976. The product portfolio centers on four main models: the OS7 (self-propelled unit for large-scale projects with 400 tons/shift capacity), Ultra Pro (premium model with advanced wireless remote and 100 ft placement), Ultra (standard model available in 16/18/20 ft sizes), and Mini Ultra (compact unit for tight job sites). Custom solutions include Creep Drive remote maneuvering, High Capacity 40 yd³ boxes, Front Discharge configurations, and Trailer Mounted options. All products share the core technology of high-speed outboard rear conveyors mounted on truck bodies for precise aggregate placement.

Differentiator

Problem solved

Functional benefit

Brands

• Ultra Pro Stone Slinger: Cutting-edge material delivery solution designed for maximum precision and efficiency with lower center of gravity and high tensile, abrasion resistant steel construction.
• Ultra Stone Slinger
• OS7 Stone Slinger
• Super Stone Slinger
• MINI Ultra Stone Slinger

Quantifiable outcome

• Non-stop material placement of up to 400 tons per shift (OS7 model)
• +2 more outcomes

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• D&R CompaniescoreChannel Partner/ Reseller/ DistributorAuthorized Western Canada distributor covering Alberta region. Located at 12 Fisher Crescent, Okotoks, AB T1S 1A7. Tel: 1-877-938-4767. Represents Stone Slinger products in Western Canada market.
• Geroquip Inc.coreChannel Partner/ Reseller/ DistributorAuthorized Quebec and Eastern Canada distributor. Located at 4795 rue Louis-B.-Mayer, Laval, PQ H7P 6G5. Tel: 1-877-978-0200. Represents Stone Slinger products in Quebec and Eastern Canada.
• Asher Conveying, LLCminorChannel Partner/ Reseller/ DistributorParts-only distributor for Central and North-Eastern USA. Located at 1280 Griffith Road, Greenwood, IN 46143. Contact: Tyler at 463-269-4763.
• Redefined Diesel Repair, LLCminorChannel Partner/ Reseller/ DistributorSouth-Central USA distributor. Located at 2337 Industrial Ct., Greenbrier, TN 37073. Tel: 615-480-7923.
• Kelly's Directional Inc.coreChannel Partner/ Reseller/ DistributorWestern USA distributor. Located at 3240 Olympic Street, Springfield, OR 97478. Tel: 1-541-746-5200. Represents Stone Slinger products in Western United States.
• Morin DieselminorChannel Partner/ Reseller/ DistributorNorth-Eastern USA distributor. Located at 1587 Portland Cobalt Road, Portland, CT 06480. Tel: 860-342-2600.
• Earthmoving Solutions B.VcoreChannel Partner/ Reseller/ DistributorEuropean distributor for Stone Slinger products. Located at Wilgenkampweg 53, 7547 RZ Enschede, The Netherlands. Tel: 0031-53-4281513. Email: [email protected]. Website: www.stoneslinger.nl
• Dakota Mining and Quarry EquipmentcoreChannel Partner/ Reseller/ DistributorSouth Africa distributor. Contact: Howard Behrmann at Tel: +27 82 360 0043, [email protected]. Represents Stone Slinger products in South African market.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Putzmeister Holding GmbH: Putzmeister is the global leader in mobile concrete placing booms and pumps — truck-mounted systems that deliver flowable materials (concrete) precisely to a job site. Like Stone Slinger, it pioneered truck-mounted material-placement technology and serves concrete contractors with similar productivity-and-precision value propositions, making it the closest functional analog despite the different material (concrete vs. aggregate).
• Schwarze Industries: Schwarze designs and manufactures specialty truck-mounted equipment, including material-handling and aggregate-related bodies, sold primarily through dealer networks. Comparable business model: custom engineered truck bodies for niche construction/infrastructure applications with a dealer-driven distribution model in North America.
• Schwing America: Schwing manufactures truck-mounted concrete placing booms and pumps with comparable delivery boom architecture to Stone Slinger's outboard rear conveyor. Both companies solve the same fundamental problem — replacing manual wheelbarrow-style placement of bulk materials with mechanized truck-mounted delivery — and share the same contractors/ready-mix customers.
• Heil (truck bodies): Heil manufactures specialty commercial truck bodies and material-handling equipment for fleets and contractors. Compares to Stone Slinger as a custom truck-body manufacturer with installed-base aftermarket parts operations and similar construction-services buyer base, though focused on refuse and dump applications rather than aggregate placement.
• CIFA S.p.A. CIFA produces mobile concrete pumps, placing booms, and truck-mounted mixers — equipment categories where the technology stack (truck chassis + boom/placement mechanism + remote control) closely mirrors Stone Slinger's conveyor-based aggregate placement. Strong overlap in customer base (construction and infrastructure contractors) and use cases.

Emerging players

• SANY Group: SANY is a growing global heavy-equipment manufacturer with material-handling and concrete-machinery lines. SANY's expanding concrete-pump and truck-mounted equipment offerings compete in adjacent product categories and increasingly enter North American and African markets where Stone Slinger distributes.

Broad incumbents

• Liebherr-International AG: Liebherr produces earthmoving, material-handling, and crane equipment globally — including mobile conveyor systems and bulk material handlers — through Liebherr-Mining and Liebherr-Werk Ehingen. Comparable manufacturer of high-precision, heavy-duty equipment serving quarrying and construction end markets.
• Terex Corporation: Terex is a diversified global manufacturer of lifting, materials processing, and specialty equipment — including mobile conveyors, wash plants, and material-handling systems. Competes indirectly via broader equipment portfolios serving construction, quarrying, and recycling customers who overlap with Stone Slinger's road/landscape/construction buyers.
• Caterpillar Inc. Caterpillar is the world's largest construction, mining, and infrastructure equipment maker. Its material handling and compact construction lines serve the same end customers (contractors, quarries, road builders). As a broad incumbent, Caterpillar could enter or bundle precision aggregate placement, posing an indirect competitive threat to Stone Slinger's niche.
• Volvo Construction Equipment: Volvo CE manufactures wheel loaders, compact equipment, and material handling machinery serving construction and infrastructure markets. Same buyer base (general contractors, infrastructure builders) and overlapping dealer footprint in North America; Volvo's chassis supply to specialty body builders like WK Dahms also makes it a partial supplier peer.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/slingerbydahms
• Facebookfacebook.com/stoneslingerbydahms
• LinkedInlinkedin.com/company/w.k.-dahms-mfg.-ltd.

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Stone Slinger