Flange Nuts
776 ProductsSerrated Flange Locknuts
Medium-Strength Steel SerratedFlange Locknuts—Grade 5
Grade 5 medium-strength steel provides a good balance of strength and toughness.
Metric Medium-Strength SteelSerrated Flange Locknuts—Class 8
Class 8 medium-strength steel offers a higher strength rating compared to standard nuts, making it suitable for heavy-duty applications where moderate to high levels of load and stress are involved.
High-Strength Steel Serrated Flange Locknuts—Grade 8
High-Strength Steel Serrated Flange Locknuts—Grade 8 are heavy-duty fasteners designed for demanding applications where high strength, vibration resistance, and reliability are essential.
Metric High-Strength Steel SerratedFlange Locknuts—Class 10
Class 10 steel is a high-strength material that offers excellent tensile strength, typically rated around 1040 MPa (megapascals), making it suitable for demanding applications.
Low-Strength Steel Serrated Flange Locknuts
These nuts combine a basic locking feature with cost-effective, lower-strength steel material for applications that do not demand heavy-duty performance.
18-8 Stainless Steel Serrated Flange Locknuts
18-8 stainless steel refers to a grade of stainless steel that contains approximately 18% chromium and 8% nickel, offering excellent corrosion resistance and moderate strength.The material is highly resistant to rust and oxidation, making it ideal for use in marine, outdoor, and chemical environments.
Metric 18-8 Stainless Steel Serrated Flange Locknuts
These locknuts are ideal for environments where durability and resistance to loosening under vibration are essential. They are particularly suited for applications in marine, outdoor, and industrial environments, where both corrosion and vibration are concerns.
Super-Corrosion-Resistant 316 StainlessSteel Serrated Flange Locknuts
316 stainless steel is one of the most corrosion-resistant types of stainless steel, particularly effective in environments exposed to saltwater, industrial chemicals, or extreme weather.
Metric Super-Corrosion-Resistant 316Stainless Steel Serrated Flange Locknuts
These locknuts adhere to metric standards, making them compatible with metric bolts and fasteners used in international or industrial projects.
Brass Serrated Flange Locknuts
Brass Serrated Flange Locknuts are specialized fasteners made from brass, known for their excellent corrosion resistance, electrical conductivity, and aesthetic appearance. These locknuts feature a serrated flange, providing a secure locking mechanism without the need for additional hardware.
Nylon-Insert Flange Locknuts
Medium-Strength Steel Nylon-InsertFlange Locknuts—Grade F
These locknuts incorporate a nylon insert that adds an extra layer of locking capability, while the integrated flange helps distribute pressure evenly. They are commonly used in automotive, machinery, and other moderate-strength applications where resistance to loosening under vibration is important.
Metric Medium-Strength SteelNylon-Insert Flange Locknuts—Class 8
These locknuts feature a nylon insert that provides additional locking power, along with a built-in flange that helps distribute pressure and reduces the need for additional hardware like washers.
Metric High-Strength Steel Nylon-InsertFlange Locknuts—Class 10
Class 10 locknuts have a higher tensile strength (up to approximately 1040 MPa), making them ideal for applications that require fasteners capable of handling greater torques and stresses without deformation or failure.
High-Strength Steel Nylon-InsertFlange Locknuts—Grade G
These locknuts feature a nylon insert that creates a self-locking mechanism, along with an integrated flange that distributes load evenly, reducing the need for additional components like washers. Grade G locknuts are commonly used in industries such as automotive, heavy machinery, and construction where high-strength performance is essential.
Stainless Steel Nylon-Insert Flange Locknuts
The nylon insert inside the locknut creates friction between the nut and the bolt, providing a self-locking mechanism that prevents loosening due to vibration or dynamic forces.
Metric Stainless Steel Nylon-Insert Flange Locknuts
The combination of stainless steel and a nylon insert ensures that these locknuts remain secure in environments subject to vibration and corrosive elements. Their metric sizing makes them ideal for use in international projects or industries that require metric standards.
Distorted-Thread Flange Locknuts
High-Strength Steel Distorted-Thread Flange Locknuts
These locknuts feature a distorted thread that creates a mechanical locking action, ensuring they stay securely fastened even under extreme conditions. The integrated flange helps distribute the load evenly, reducing material deformation and eliminating the need for additional washers.
Metric High-Strength Steel Distorted-ThreadFlange Locknuts—Class 10
The distorted-thread design creates a mechanical locking action by increasing friction between the nut and the bolt threads. This prevents the nut from loosening due to vibration or movement, ensuring a secure connection.
Mil. Spec. Low-Strength SteelDistorted-Thread Flange Locknuts
These locknuts are designed for low-strength applications where resistance to loosening due to vibration is crucial. The distorted thread provides a self-locking mechanism, ensuring the nut remains securely fastened, while the flange distributes load evenly to prevent material damage.
Medium-Strength Steel Distorted-ThreadFlange Locknuts—Grade 5
These locknuts feature a distorted thread that provides a self-locking mechanism, eliminating the need for additional locking components. The built-in flange helps distribute the load evenly across the surface, reducing the risk of material deformation and improving stability.
Metric Medium-Strength SteelDistorted-Thread Flange Locknuts—Class 8
These locknuts feature a distorted thread for self-locking, providing a reliable connection without the need for additional locking components like washers or adhesives. The integrated flange distributes load evenly, reducing material deformation and enhancing stability. These locknuts are widely used in industries such as automotive, machinery, and construction.
Stainless Steel Distorted-Thread Flange Locknuts
Made from stainless steel, these locknuts offer excellent corrosion resistance, making them ideal for use in harsh environments such as marine, outdoor, and chemical processing industries.
Thread-Forming Flange Locknuts
Thread-Forming Flange Locknuts
These locknuts are ideal for applications where vibration resistance, ease of installation, and cost-efficiency are important. The integrated flange helps distribute load evenly, improving stability and reducing material damage.
Flange Nuts
High-Strength Steel Flange Nuts—Grade 8
These flange nuts are made from Grade 8 steel, which provides superior tensile strength and durability. The integrated flange ensures even load distribution, helping to prevent material damage while eliminating the need for separate washers.
Metric High-Strength Steel Flange Nuts—Class 10
These nuts are made from Class 10 steel, offering superior strength and durability. The integrated flange helps to distribute load evenly, reducing material damage and eliminating the need for separate washers.
JIS High-Strength Steel Flange Nuts
These nuts are made from high-strength steel and are designed for applications that require excellent tensile strength, reliability, and vibration resistance. The integrated flange ensures even load distribution, reducing the risk of damage to the material being fastened while also eliminating the need for additional washers.
Metric Medium-Strength Steel Flange Nuts—Class 8
Class 8 medium-strength steel provides good tensile strength, typically rated around 800 MPa or higher. This makes these nuts ideal for applications that require moderate load-bearing capacity and durability.
Medium-Strength Steel Flange Nuts
These nuts feature an integrated flange that helps distribute load evenly, reducing the risk of material damage and eliminating the need for additional washers.
JIS Medium-Strength Steel Flange Nuts
These flange nuts offer excellent tensile strength for medium-load applications and feature an integrated flange that helps distribute the load evenly across the surface, reducing the risk of material damage and eliminating the need for washers.
Low-Strength Steel Flange Nuts
These nuts typically have a tensile strength lower than medium- or high-strength steel fasteners, making them suitable for light-duty applications.
Metric Low-Strength Steel Flange Nuts
These nuts come with an integrated flange to distribute the load more evenly over the surface of the material being fastened. They are commonly used in applications such as household appliances, furniture, light industrial machinery, and non-critical construction projects where moderate strength and durability are sufficient.
18-8 Stainless Steel Flange Nuts
These flange nuts are designed for applications that require excellent corrosion resistance, moderate strength, and vibration resistance.
Metric 18-8 Stainless Steel Flange Nuts
The integrated flange helps distribute load evenly, reducing material damage and eliminating the need for additional washers. These flange nuts are widely used in industries such as marine, construction, automotive, and food processing, where metric fasteners are required.
Super-Corrosion-Resistant 316Stainless Steel Flange Nuts
These flange nuts are made from 316 stainless steel, which contains molybdenum, providing enhanced resistance to pitting, corrosion, and harsh chemical exposure.
Fiberglass Flange Nuts
Fiberglass Flange Nuts are lightweight, corrosion-resistant fasteners made from fiberglass-reinforced plastic (FRP) or composite materials. These nuts are designed for applications where weight reduction, electrical insulation, and resistance to corrosion, chemicals, and weathering are critical.
High-Torque 12-Point Flange Nuts
Steel High-Torque 12-Point Flange Nuts
These nuts feature a 12-point design, which allows for greater torque transfer compared to standard hex nuts. The integrated flange provides even load distribution, reducing the need for washers and helping to prevent material damage.
Stainless Steel High-Torque 12-Point Flange Nuts
The 12-point design allows for more engagement points between the wrench and the nut, enabling better torque transfer and allowing for higher tightening forces compared to traditional hex nuts.
Leveling Flange Nuts
Steel Leveling Flange Nuts
Leveling flange nuts are designed to be used with leveling bolts or adjustable feet to facilitate precise height adjustment and alignment of machinery or components.
Stainless Steel Leveling Flange Nuts
These nuts feature an integrated flange that ensures even load distribution, preventing material damage and improving stability during leveling operations.
LILY Bearing stocks flange nuts across roughly 40 variations — plain flange nuts graded by strength, three distinct flange locknut locking mechanisms, and specialty types like rotating, leveling, and thread-repairing. Use the filters below, or the comparison table, to narrow down by locking type, function, or material.
Compare Flange Nut Types
| Type | How It Works | Best For | Watch Out For | Materials |
|---|---|---|---|---|
| Standard Flange Nuts (by Strength Grade) | A built-in flange spreads clamp load over a wider area than a plain hex nut; no locking feature | General assembly on softer or thin materials prone to surface damage | No built-in resistance to loosening — add a locknut version for vibration | Steel (multiple grades), 18-8 stainless steel, fiberglass |
| Serrated Flange Locknuts | Serrated teeth on the flange face bite directly into the mating surface | Vibration resistance on bare metal surfaces where marring is acceptable | The teeth can mar painted, coated, or finished surfaces | Steel, 18-8 stainless steel, brass |
| Nylon-Insert Flange Locknuts | A nylon ring inside the nut grips the bolt threads to resist loosening | Vibration resistance without marring the mating surface | Lower temperature ceiling than all-metal (distorted-thread) locking | Steel, stainless steel |
| Distorted-Thread Flange Locknuts | A deformed section of internal thread grips the bolt — no plastic insert | High-temperature environments where a nylon insert would degrade | Generally requires more installation torque than a nylon-insert type | Steel, stainless steel |
| Thread-Forming Flange Locknuts | An all-nylon nut forms its own mating thread pattern as it's tightened onto the bolt | Low-cost, vibration-resistant fastening in lighter-duty assemblies | Limited temperature range (roughly -40° to 185°F) and lower strength than metal options | Nylon 6/6 plastic |
| Rotating Flange Nuts | The flange spins independently of the threaded body, so it doesn't turn with the nut during tightening | Protecting a finished or coated surface from galling or scratching during installation | No locking feature — pair with a lock washer if vibration is a concern | Steel |
| Leveling Flange Nuts | A pivoting flange/washer combination self-aligns up to a few degrees of tilt | Leveling bolts or adjustable feet on machinery and equipment | Correction angle is limited (roughly 1.5°) — not for major surface misalignment | Steel, stainless steel |
| High-Torque 12-Point Flange Nuts | A 12-point drive gives a wrench or socket more contact points than a standard hex | High-torque applications in tight spaces where a standard hex socket might slip | Requires a 12-point socket or wrench — a standard hex socket won't seat properly | Steel |
| Thread-Repairing Flange Nuts | Works like a thread-cutting die, reforming damaged threads and clearing rust or weld spatter as it's installed | Salvaging a bolt or stud with damaged threads instead of replacing it | Not a substitute for a standard flange nut in undamaged-thread applications | Zinc-flake-coated steel |
Choosing a Flange Locknut Mechanism
A plain flange nut has no built-in resistance to loosening — it only spreads clamp load over a wider area. If you need vibration resistance, three flange locknut mechanisms cover different trade-offs: serrated locknuts bite into the mating surface for strong grip but can mar finished surfaces; nylon-insert locknuts protect the surface but are limited to moderate temperatures; and distorted-thread (all-metal) locknuts hold up in higher-temperature environments where a nylon insert would degrade, at the cost of higher installation torque.
Need a Custom Flange Nut or a Part Cross-Reference?
Working from an existing McMaster-Carr or manufacturer part number? Our team can cross-reference it to an equivalent LILY Bearing flange nut, or quote a custom material, locking type, or finish. Request a Quote or Contact Us.
Frequently Asked Questions
What's the difference between a serrated and a nylon-insert flange locknut?
A serrated flange locknut has teeth on the flange face that bite into the mating surface for grip, which can mar painted or coated finishes. A nylon-insert flange locknut instead grips the bolt threads themselves with a plastic ring, protecting the mating surface but with a lower temperature limit.
What does a rotating flange nut do?
The flange rotates independently of the threaded body, so it stays stationary against the material's surface while the nut itself turns during tightening. This prevents the flange from scratching or galling a finished surface.
When would I use a leveling flange nut instead of a standard one?
Use a leveling flange nut with a leveling bolt or adjustable foot when the mounting surface isn't perfectly flat. Its pivoting design can self-correct for a small amount of tilt (roughly 1.5°), which a standard flange nut can't accommodate.
Can a thread-repairing flange nut fix a damaged bolt?
Yes, within reason. As it's threaded on, it reforms lightly damaged threads and clears debris like rust or weld spatter, similar to running a thread-cutting die over the bolt. It's meant to salvage a fastener with minor thread damage, not repair a severely stripped or bent bolt.
