High Temperature Fastening Solutions

Your Cheapest Fastener is Your Most Expensive Problem

A cheap exhaust fastener is the most expensive part in any high-temp system. Extreme heat softens standard fasteners, melts the locking mechanisms, and loosens the joint a little more each cycle. Until, eventually, it fails.

The right spec costs more per fastener, but less per everything else.

Access High-Temp Fastener Resources

Get the information and support you need to solve fastener challenges under heat, cycling, and vibration.

What would you like to access? (Select all that apply)

The Conditions Standard Fasteners Weren't Built For

Inside every high temperature joint, several factors work together to cause a standard fastener to fail.

Thermal Cycling

Thermal Cycling

Each heat cycle loosens the joint a little more. Standard fasteners sacrifice clamp load until they eventually fail.

Thermal Expansion

Thermal Expansion

Dissimilar materials expand at different rates. Every heat cycle works against the joint.

Vibration Loosening

Vibration Loosening

Vibration puts every fastener under constant stress. When thermal cycling has already compromised the joint, vibration makes failure inevitable.

Material Degradation

Material Degradation

Extreme heat breaks down what fasteners depend on. Nylon softens, adhesives fail, and the joint follows.

The Fix Is in the Material

A286 stainless steel, Inconel® 718, and Nimonic® 80A can withstand extreme temperatures, depending on the alloy. Pair them with our improved MacLean-Fogg Lockthread technology, to resist loosening through mechanical interference, and there's no nylon to melt, no adhesive to break down, and no expensive failure hiding in your high temperature joint.

The right spec means the right performance, every cycle.

Choose the resource that fits where you are.

The Spec Sheet covers what we make. The Diagnostic Guide covers how to figure out what you need.

product-resource-icon
PRODUCT RESOURCE

Spec Sheet

Alloy options, temperature ratings, MacLean-Fogg Lockthread specs, and product details for high-temperature fasteners.

engineering-resource-icon
ENGINEERING RESOURCE

Diagnostic Guide

Five-question diagnostic framework to identify where your current spec falls short and what category the problem falls into.

Access Resources

You'll be able to select the resources you'd like on the form.

The ROI of the Right Fastener

Better materials, mechanical locking, and engineering support can add up to a total cost that's lower than the alternative.

What Your Fasteners Should Be Made Of

Not every high-temperature application needs the same alloy. A286 stainless steel covers most exhaust and turbo work. Inconel 718 is built for extreme strength and fatigue demands in high-load engines. Nimonic 80A is for the hottest environments. See the full temperature ranges and performance data in our spec sheet.

High-temperature fastener

A Lock Engineered for Exhausts

MacLean-Fogg Lockthread technology doesn't rely on nylon, adhesive, or anything that degrades under heat. It locks mechanically through interference at the minor diameter, a wedge angle that resists loosening under tension, and a trilobular cross-section to keep friction consistent across the joint.

Lockthread fastening technology

High Heat. High Stakes. High Performance.

High temperature fastener

High Temperature Fasteners

When your parts have to operate at peak performance in extreme conditions, you need fasteners engineered for the thermal load.

Key Features:

  • Specialty alloys withstand extreme temperatures
  • Prevent galling and seizing
  • Available with MacLean-Fogg improved Lockthread technology
  • Complete solutions: nuts, fasteners, and studs
Improved MacLean-Fogg Lockthread technology

Improved MacLean-Fogg Lockthread Technology

Advanced three-lobe MacLean-Fogg Lockthread technology uses three lobes instead of a perfect circle to resist vibration through mechanical interference.

Key Features:

  • Available self-aligning MacLean-Fogg Lockthread technology
  • Easy installation with standard tools
  • No thread adhesives, or nylon inserts required
  • Mates with standard threaded nuts and tapped holes

Where Standard Fasteners Don't Cut It

Automotive Exhaust Systems

Turbocharger mounting. Exhaust manifolds. Catalytic converter assemblies. These joints endure intense heat, high pressure, and constant thermal cycling demanding fasteners that seal reliably and hold up to the strictest emissions requirements.

The Solution:

A286 stainless steel studs and fasteners engineered to maintain strength in extreme temperatures. Anti-galling coatings for clean installation and consistent torque-tension.

Automotive exhaust fastener
Industrial fasteners

Industrial and Heavy Equipment

Agricultural engines run sustained high-load cycles. Construction equipment operates under extreme vibration. These are bigger engines with bigger turbos, higher pressures, and forces that demand more from every component in the exhaust system.

The Solution:

Inconel 718 studs and fasteners for applications where strength and fatigue resistance matter as much as heat. Backed by engineer-to-engineer support on demand.

Industries We Serve

We develop the parts that hold entire industries together.

Automotive

Automotive

Defense

Defense

Agriculture

Agriculture

Industrial Engines

Industrial Engines

Power Sports

Power Sports

Off-Highway

Off-Highway

Aerospace

Aerospace

Marine

Marine

Power Generation

Power Generation

Construction

Construction

Expert Engineers on Your Side

With 100 years of experience and a shared knowledge base across divisions, we solve the problems others can't.

U.S. Manufacturing

U.S. Manufacturing

U.S.-made for shorter lead times, BABA compliance, and reduced tariff exposure.

Technical Expertise

Technical Expertise

Our engineers work with you, and together, to solve your engineering challenge.

Family Owned and Operated Since 1925

Family Owned and Operated Since 1925

Over 100 years. Four generations. Same world-class engineering solutions.

Our certifications include IATF 16949, ISO 14001 and ISO 9001

100+

Years of Engineering Excellence

50+

Years of High-Temperature Fastener Experience

800°C

Max Temperature

Tell Us Your Problem & We'll Solve it Together

It's as simple as that. Something's failing and you need a better part? Tell us what you're up against; we'll develop a component designed to perform just as you need it to.

Because we've solved challenges exactly like yours since 1925.

Access High-Temp Fastener Resources

Get the information and support you need to solve fastener challenges under heat, cycling, and vibration.

What would you like to access? (Select all that apply)