What Mac-Weld Machining does

Mac-Weld Machining Ltd. is a privately held Canadian industrial manufacturer founded in 1980 and headquartered in Sarnia, Ontario. The company produces precision instrumentation hardware used in industrial process measurement — primarily thermowells, orifice plates and flow components, bleed and flush rings, level and pressure accessories, and instrument manifolds and valves. Manufacturing is built around a single Sarnia facility producing over 150,000 thermowells annually for a global client base of more than 500 companies, with deep specialization in exotic materials (Titanium, Chrome Molys, Hastelloy, Monel) welded under boiler-pressure code, in-house robotic welding with 100% UT Phased Array testing, full material traceability, and exotic CNC capabilities such as deep hole drilling.

The company sells primarily through direct, quote-based B2B engagement — phone, email, and a website-driven RFQ process — without intermediaries or published price lists. Customers span two principal segments: industrial process operators (oil & gas, petrochemical, power generation, general process manufacturing) who buy standard and custom catalog products, and OEM/instrumentation manufacturers who source finished hardware under private label. A small proprietary software revenue stream exists via V-Mac Wake Frequency Software, an engineering calculation tool that helps specifiers validate thermowell designs under flow-induced vibration and also acts as a pull-through channel for hardware sales.

Mac-Weld is ISO 9001:2015 certified, TSSA certified under CSA B51 and ASME B31.1/B31.3 for fabrication and repair of pressure-bearing fittings, and offers CRN-registered and NACE MR 0175 compliant product configurations. The business is owner/management-controlled with no disclosed outside investment, M&A activity, or leadership turnover in the source data, and pricing is delivered as custom quotes typically tied to multi-year supply arrangements. The combined revenue mix is concentrated in custom and standard thermowells, with adjacent flow/pressure hardware and a long tail of custom machining and specialty welding for hazardous-service applications.

Name

Mac-Weld Machining

Legal name

Mac-Weld Machining Ltd.

Website

https://mac-weld.com

Company type

Private

Founded year

1980

Operating status

Operating

Headcount range

51–100 employees

Short description

Mac-Weld Machining is a 44-year-old Sarnia, Ontario-based manufacturer of precision instrumentation hardware — thermowells, orifice plates, bleed/flush rings, level/pressure instruments, and manifold valves — for 500+ global industrial and OEM customers, with deep expertise in exotic-material welding and ISO 9001/TSSA-certified quality systems.

Ownership category

akta.pro rank

Product category

Industrial Instrumentation Hardware Manufacturing

NAICS

Machine Shops (332710), Other Metal Valve and Pipe Fitting Manufacturing (332919), Turned Product and Screw, Nut, and Bolt Manufacturing (33272)

SIC

Miscellaneous Fabricated Metal Products (3490)

akta.pro primary industry

Metal Cutting Tools, Tooling & Workholding (Cutters, Inserts, Chucks, Fixtures) (IMAHADAB)

akta.pro secondary industries

Welding, Joining & Soldering Equipment (Arc, Resistance, Friction, Brazing) (IMAHADAH), Welding, Fabrication & Field Machining Services (On-site) (IMAIACAD)

Keywords

• Precision machining services
• Thermowell manufacturing
• Flow measurement components
• Orifice plate fabrication
• Instrumentation hardware

Headquarters

HQ city

Sarnia

HQ country

Canada

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Thermowell Manufacturing: Design and manufacture of thermowells including flanged, helical, injection quills, limited space, protection tubes, socket-weld, tri-clamp, threaded, Vanstone, and weld-in configurations. Over 150,000 units produced annually.
2. Orifice Plates and Flow Components: Custom and universal orifice plates, meter run assemblies, multi-stage restriction orifices, and related flow measurement components.
3. Instrument Hardware Components: Bleed and flush rings, pressure/level components including gauge siphons, level chambers, spool pieces, seal pots, and manifold valves.
4. Custom Manufacturing Services: Specialty welding and machining requests, blanket requests, and custom product manufacturing for specific customer requirements.
5. V-Mac Wake Frequency Software: Proprietary software for wake frequency calculations related to thermowell design.
6. Private Label/OEM Products: Products manufactured under private label for global customers in instrumentation and OEM sectors.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels2 records

Core offering

Mac-Weld Machining designs and manufactures precision instrumentation hardware, primarily thermowells (flanged, helical, socket-weld, threaded, weld-in, Vanstone, tri-clamp, limited space, injection quills, and protection tubes) and orifice plates and flow measurement components, plus bleed/flush rings, pressure and level instruments (gauge siphons, level chambers, spool pieces, seal pots), and instrument manifold/needle valves. The company also offers specialty custom machining and exotic-material welding services and provides products under private label to OEM customers, serving a global base of more than 500 industrial clients.

Product overview

Mac-Weld Machining is a North American manufacturer of precision instrumentation hardware, specializing in thermowells and flow measurement components. The product portfolio centers on Thermowells (including flanged, helical, socket-weld, threaded, vanstone, weld-in, tri-clamp, limited space, injection quills, and protection tubes), Orifice Plates and Flow Components (universal, custom, RTJ designs, paddle plates, wafer assemblies, meter runs), Bleed & Flush Rings, Pressure/Level Instruments (gauge siphons, level chambers, spool pieces, seal pots), and Manifolds & Valves (needle valves, instrument manifolds, double block and bleed). The company also offers V-Mac Wake Frequency Software for thermowell engineering calculations. Products are manufactured from various materials including carbon steel, stainless steel, titanium, chrome molys, hastelloy, and monel. The company provides both standard products and custom manufacturing capabilities, serving a global client base of over 500 companies with blanket requests and specialty welding/machining.

Differentiator

Problem solved

Functional benefit

Products and services

• Thermowells Precision-engineered thermowells that protect temperature sensors in industrial process applications, available in multiple configurations including flanged, helical, injection and sample quills, limited space, protection tubes, socket-weld, tri-clamp, threaded, Vanstone, and weld-in designs. For OEM, petrochemical, power generation, and process manufacturing customers.
• Orifice Plates and Flow Components Comprehensive range of orifice plates and flow measurement components for accurate flow measurement of gas, liquid, and steam across industrial applications, including custom, universal, RTJ, paddle, wafer, and meter run assemblies. For flow measurement buyers in oil and gas, petrochemical, and process plants.
• Spectacle Blinds Single-piece plate spectacle blinds for temporarily or permanently isolating parts of a piping system, built to ASME B16.48 standards. For pipeline isolation and process plant maintenance.
• Vented Blinds/Paddles Paddle blinds that block flow on one side while allowing pressure relief on the other side, providing safer downstream work conditions and an economical solution when isolation valves are unavailable. For process plant maintenance and shutdown operations.
• Bleed and Flush Rings Industrial bleed rings, flush rings, and bleed ring and flush ring assemblies for pipeline maintenance and testing applications. For oil and gas, petrochemical, and industrial process operators.
• Pressure and Level Instruments Instrumentation hardware including gauge siphons, level chambers, spool pieces, and seal pots for pressure and level measurement applications. For process plant instrumentation and control.
• Manifolds and Valves Instrument manifold valves including needle valves, flange x flange manifolds, low profile instrument manifolds, and double block and bleed configurations. For instrumentation mounting and isolation in process plants.
• V-Mac Wake Frequency Software Proprietary software tool for performing wake frequency analysis for thermowell design, helping engineers ensure proper thermowell selection for specific flow conditions. For instrumentation and process engineers selecting thermowells.
• Custom Manufacturing and Specialty Welding Services Specialty welding and machining services, blanket requests, and custom product manufacturing for specific customer requirements, including welding of exotic materials (Titanium, Chrome Molys, Hastelloy, Monel) under boiler pressure code and deep hole drilling. For industrial customers with unique or custom fabrication requirements.

Quantifiable outcome

• Over 150,000 thermowells produced annually
• +2 more outcomes

Named customers2 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• WIKA Instruments: WIKA is a leading global manufacturer of pressure, temperature, level, and flow measurement instrumentation. Its thermowell and instrumentation fitting portfolio competes head-on with Mac-Weld across process industries, while offering a broader catalog and global sales network.
• Endress+Hauser: Endress+Hauser is a global process instrumentation major offering flow, level, pressure, and temperature measurement products. It addresses the same industrial customers as Mac-Weld and competes for thermowell and orifice plate specification, with deeper R&D and broader integration.
• Emerson (Rosemount): Emerson's Rosemount brand is a global leader in process instrumentation, supplying temperature, pressure, and flow measurement products. It competes broadly in the same end-markets as Mac-Weld and often specifies thermowells and orifice plates into the same projects.
• ABB Measurement & Analytics: ABB's Measurement & Analytics business offers flow, pressure, temperature, and level instrumentation including thermowells and orifice plates for power, oil & gas, and process industries. It targets the same specification-driven customers as Mac-Weld with a broader portfolio.
• Flowserve (Daniel): Flowserve, including the Daniel legacy product line, manufactures flow measurement and control products including orifice plates and meter runs. It addresses the same flow-measurement customers as Mac-Weld with broader industrial pump and valve capabilities.

Direct peers

• Ashcroft: Ashcroft manufactures pressure and temperature instrumentation including thermowells and related hardware. It overlaps with Mac-Weld's core thermowell and pressure/level instrument product family, serving overlapping process-industry customers.
• Swagelok: Swagelok makes instrumentation fittings, manifolds, valves, and associated fluid-system components widely used alongside thermowells and orifice plates. Its manifolds/valves line competes directly with Mac-Weld's Manifolds & Valves category in similar process-industry applications.
• AS-Schneider: AS-Schneider specializes in manifold valves and instrumentation accessories for oil & gas, petrochemical, and power industries. Its product focus on needle valves, double block-and-bleed, and instrument manifolds overlaps directly with Mac-Weld's Manifolds & Valves offering.
• Hex Valve: Hex Valve is a manufacturer of instrumentation manifolds, needle valves, and double block-and-bleed valves for oil & gas and process industries. Its product family competes directly with Mac-Weld's Manifolds & Valves category on similar RFQs and certifications.
• Magnetrol (a Roper brand): Magnetrol manufactures level and flow instrumentation, including level chambers and related instrumentation hardware. It overlaps with Mac-Weld's Pressure/Level Instruments category and competes for similar petrochemical and process-industry orders.

Market position

Strengths5 records

Weaknesses6 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/mac_weld
• LinkedInlinkedin.com/company/macweld

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

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 Mac-Weld Machining