What Mackson Nuclear, Llc does

Mackson Nuclear, LLC is a privately held, Rock Hill, SC-based supplier of safety-related fasteners, fittings, flanges, and fabricated components for the nuclear industry, operating as a specialized affiliate under Tioga Holdings alongside Tioga Pipe, Inc. and TPS Nuclear. The company sits within a broader distribution network that markets the world's largest chrome moly alloy inventory and operates large stocking distribution sites in Easton, PA and Houston, TX with regional sales offices in Philadelphia and Chattanooga. The affiliated network holds the longest continuously maintained ASME Nuclear Certificate and QSC distributor status in the U.S. since 1982, with audited compliance against ASME Section III, 10CFR50 Appendix B, N45.2, NQA-1, and CAN3-Z299 SERIES, alongside ISO 9001:2015, MIL-I-45208A, and ABS certifications for nuclear, military, and naval shipbuilding supply chains.

The core technology and product set spans nine material categories — chrome alloy (P1, P5, P9, P11, P22, P91, P92), stainless (304/304L, 316/316L, 317, 321, 347, 310), carbon, low temperature (1, 3, 6), duplex (2205), nickel alloy (Monel 400, Inconel 600/625, Incoloy 800 series), and specialty metals — supplemented by the Tioga Nuclear Products® and Tioga Military® sub-brands. The group operates in-house non-destructive and destructive laboratory testing (ultrasonic, hydrostatic, PMI, X-ray, magnetic particle, liquid penetrant, chemical analysis, mechanical testing, photomicrographs, impact testing, hardness) and uses the trademarked Tioga Protocol® four-phased project management methodology (Initiation, Planning, Execution, Closing) plus a 24-hour emergency supply service. A proprietary technical database reportedly indexes over 70,000 metal grade entries for specification lookup.

The business model is direct enterprise B2B distribution with quote-based pricing on multi-year contracts, no public e-commerce, and sales driven by phone (800-523-3678), email ([email protected]), and dedicated regional sales contacts for nuclear and military projects. End customers include U.S. Navy shipyards and primes (Newport News Shipbuilding, General Dynamics Electric Boat, Bath Iron Works, Ingalls, BAE Systems) for MIC Level 1 materials, nuclear utilities (Duke Energy), and large petrochemical and power-generation operators (LyondellBasell, Longview Power). The group markets globally across North America, other global regions, and Southeast Asia for power generation, oil refining, gas and chemical processing, boiler, heater, and fabrication industries in addition to the two anchor verticals of nuclear and military shipbuilding.

Name

Mackson Nuclear, Llc

Legal name

Tioga Pipe, Inc.

Website

https://mackson.biz

Company type

Private

Founded year

1935

Operating status

Operating

Headcount range

1–10 employees

Short description

Mackson Nuclear, LLC is a Rock Hill, SC-based supplier of safety-related fasteners, fittings, flanges, and fabricated components for the nuclear industry, operating as an affiliate of Tioga Holdings alongside Tioga Pipe and TPS Nuclear.

Ownership category

akta.pro rank

Product category

Industrial Pipe, Fittings & Flanges Supply

NAICS

Iron and Steel Pipe and Tube Manufacturing from Purchased Steel (33121), Other Metal Valve and Pipe Fitting Manufacturing (332919), Fabricated Pipe and Pipe Fitting Manufacturing (332996)

SIC

Steel Pipe & Tubes (3317), Bolts, Nuts, Screws, Rivets & Washers (3452)

akta.pro primary industry

Quality Assurance / Quality Control (QA/QC) & Nuclear Codes Compliance (ASME, RCC-M, etc.) (EUAKAAAI)

akta.pro secondary industries

Material Control & Accounting (MC&A) Systems & Auditing (inventory, measurements, records) (EUAKAJAD), Mechanical, Electrical & Piping Installation (MEP) (EUAKAAAG)

Keywords

• Nuclear pipe fittings
• Alloy metal supply
• Military shipbuilding materials
• Industrial fastener fabrication
• Power generation piping

Headquarters

HQ city

Rock Hill

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Specialty Metal Products Sales: One-time product sales of specialized steel pipe, tubing, fittings, flanges and related products. Products include chrome alloy, stainless, carbon, low temp, duplex, nickel alloy, specialty metals, military-spec and nuclear-grade materials. Pricing is quote-based B2B.

Pricing tiers

Go-to-market motion2 records

Distribution channels1 record

Marketing channels7 records

Core offering

Mackson Nuclear, LLC supplies safety-related fasteners, fittings, flanges, and fabricated components for the nuclear industry, operating within the Tioga Pipe group as a specialty industrial metal products distributor. The company supplies chrome alloy, stainless steel, carbon steel, low temperature, duplex, nickel alloy, and specialty metal pipe, tubing, fittings, plates, bars, and structurals to nuclear power plants, U.S. military shipbuilders, power generation operators, oil refiners, and chemical processors. Integrated services include Tioga Protocol project management, 24/7 emergency material supply, in-house laboratory testing, and global logistics.

Product overview

Mackson Nuclear LLC operates Tioga Pipe as a specialized industrial pipe supply distributor offering a comprehensive portfolio of mission-critical metal products organized across nine core product categories: Chrome Alloy Products, Stainless Steel Products, Carbon Steel Products, Low Temperature Products, Duplex Products, Nickel Alloy Products, and Specialty Metals. These are supplemented by two specialized sub-brands—Tioga Military Products for U.S. Navy shipbuilding applications and Tioga Nuclear Products for nuclear power generation. The company positions these products as the 'largest inventory' and 'world's largest chrome inventory' offerings. Beyond product supply, the portfolio includes four integrated service offerings: Tioga Protocol Project Management (a structured four-phased approach), 24-Hour Emergency Services, Special Services (material preparation), and Logistics Services. Laboratory Testing Services and Technical Question support round out the service capabilities. The company maintains stocking distribution sites in Easton, PA and Houston, TX, serving power generation, nuclear, oil refining, gas and chemical processing, military shipbuilding, heater, boiler, and fabrication industries globally.

Differentiator

Problem solved

Functional benefit

Products and services

• Chrome Alloy Products Comprehensive line of chrome moly alloy pipe, fittings, and flanges including grades P1, P5, P9, P11, P22, P91, and P92 for high-temperature power generation and petroleum applications. Sold to nuclear power plants, power generators, refineries, and chemical processors.
• Stainless Steel Products Stainless steel pipe, tubing, fittings, and flanges in grades 304/304L, 316/316L, 317, 321, 347, and 310 for corrosive and high-temperature service applications.
• Carbon Steel Products Carbon steel pipe, fittings, and flanges including seamless and welded varieties in A/SA106B, A/SA106C, and API5L specifications for general and high-temperature service.
• Low Temperature Products Low temperature carbon steel pipe, fittings, and flanges in grades 1, 3, and 6 (A/SA333, A/SA350, A/SA420) for cryogenic and low-temperature service applications.
• Duplex Products Duplex stainless steel pipe, fittings, and flanges in grades 2205 and S31803/S32205 for flow-accelerated corrosion and microbiologically-induced corrosion resistance in nuclear and commercial projects.
• Nickel Alloy Products Nickel alloy pipe, fittings, and flanges including Monel 400, Inconel 600/625, and Incoloy 800/800H/800HT for high-corrosion and high-temperature environments.
• Specialty Metals Specialty metal products including bars, forgings, and structurals in grades including Stainless 310, Alloy 20, Duplex 2205, Inconel 625, AL6XN, and titanium for demanding industrial applications.
• Tioga Nuclear Products Nuclear-grade piping components, structural shapes, plates, bars, fasteners, and machined products certified to ASME Section III, 10CFR50 Appendix B, NQA-1 standards for nuclear power generation projects.
• Tioga Military Products Military-spec pipe, fittings, flanges, and related products for U.S. Navy shipbuilding with over 40 years of service, meeting MIL specifications and MIC Level 1 requirements.
• Tioga Protocol Project Management Four-phased project management service (Initiation, Planning, Execution, Closing) with dedicated project managers ensuring transparency and accurate delivery of critical materials.
• 24-Hour Emergency Services Emergency material supply with response time under one hour, available 24/7 including weekends and holidays, with dedicated emergency team access.
• Special Services Material preparation services including cutting, blasting, coating, end capping, galvanizing, machine grooving, custom bending, threading, beveling, heat treating, and specialized export packaging.
• Logistics Services Comprehensive logistics including international documentation, import/export clearance, ship/rail/air deliveries, same-day shipping, Tioga Fast Ship program, and custom delivery solutions.
• Laboratory Testing Services In-house and contracted testing including ultrasonic, hydrostatic, PMI, X-ray, magnetic particle, liquid penetrant, chemical analysis, mechanical testing, flattening/bend tests, and hardness testing.

Quantifiable outcome

• Improved delivery time by 35-50 percent for Longview Power Plant project
• +4 more outcomes

Named customers13 records

Segments8 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

Two partnerships are on record, tiered core.

• Tioga HoldingscoreOthersParent holding company for Tioga Pipe, Inc. and affiliated companies including Jackson Nuclear and TPS Nuclear. Tioga Holdings oversees corporate operations for the group of companies.
• TPS NuclearcoreOthersSister company under Tioga Holdings focused on nuclear power generation supply, complementing Tioga Pipe's nuclear products division

Scale indicators7 records

Recent moves4 records

Expansion highlights4 records

Broad incumbents

• Allegheny Technologies (ATI): Specialty materials producer of nickel-based alloys, titanium, and stainless steel for nuclear, aerospace, defense, and chemical processing. Comparable on specialty alloys supplied into nuclear and military end markets.
• Vallourec: Global leader in seamless premium tubes for power generation, nuclear, and oil & gas markets. Directly comparable as a supplier of chrome alloy and stainless tubular products to nuclear and power plant customers, with overlap in ASME/Nuclear-grade materials.
• Carpenter Technology: Producer of specialty stainless steels, nickel alloys, and titanium for nuclear, aerospace, defense, and industrial markets. Comparable as a specialty alloys manufacturer whose materials overlap with Mackson/Tioga's nickel alloy and specialty metals product lines.
• MRC Global: Largest industrial pipe, valve, and fittings distributor in North America serving oil & gas, power, and chemicals. Comparable as a B2B specialty metals distributor with mission-critical industrial customers, though MRC is publicly traded and operates at vastly greater scale.
• Sumitomo Corporation (Pipe & Tube): Major Japanese supplier of carbon, alloy, and stainless steel pipe and tubes for power generation, petrochemicals, and nuclear projects. Comparable as a global supplier of chrome alloy and stainless pipe to nuclear and chemical customers.
• Sandvik (Materials Technology): Manufacturer of advanced stainless steels, nickel alloys, and special alloys for nuclear, aerospace, and chemical processing. Overlaps with Mackson/Tioga on nickel alloys (Inconel, Incoloy) and stainless grades supplied to nuclear and chemical customers.

Direct peers

• Weldbend Corporation: U.S. manufacturer of carbon, stainless, and alloy pipe fittings and flanges for nuclear, power, and petrochemical markets. Directly comparable as a domestic supplier of nuclear-grade fittings and flanges with overlapping end-market exposure.
• Bonney Forge: Manufacturer of forged and cast steel fittings, valves, and specialty components for nuclear, power, oil & gas, and shipbuilding. Directly comparable product offering (forged fittings, flanges, nuclear-grade components) and customer base (nuclear utilities, U.S. Navy).
• Haynes International: Manufacturer of high-performance nickel- and cobalt-based alloys used in nuclear, chemical processing, and aerospace. Comparable on nickel alloy product offering supplied to nuclear power and chemical processing customers.
• Marmon/Keystone (Marmon Group): Industrial pipe, tubing, and fittings distributor serving petrochemical, refinery, power, and nuclear customers. Comparable as a value-added specialty metals distributor with significant overlap in nuclear and power generation customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/Tioga-Pipe-Inc-1375600226085406
• LinkedInlinkedin.com/company/macksonnuclearllc

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Mackson Nuclear, Llc