Industrial Fasteners: Types, Materials & How to Choose the Right One
TLDR: Industrial fasteners are threaded and non-threaded devices that hold assemblies together in demanding environments. The most common types are bolts, screws, nuts, washers, rivets, and pins. Choosing the right one depends on load requirements, material compatibility, environment, and whether the joint needs to be removable.
Table of Contents
- What Are Industrial Fasteners?
- Types of Industrial Fasteners
- Industrial Fastener Materials
- Fastener Grades & Strength
- How to Choose the Right Industrial Fastener
- Where to Buy Industrial Fasteners
What Are Industrial Fasteners?
Industrial fasteners are mechanical hardware components that join, secure, or position two or more parts. Unlike welded or adhesive bonds, fasteners create joints that can be assembled, inspected, and disassembled — a critical feature for equipment maintenance, safety inspections, and part replacement.
The category is broad. According to Design World, industrial fasteners include not just nuts and bolts but also pins, clips, U-nuts, rivets, retaining rings, studs, and thread repair kits. Any device that mechanically joins two surfaces falls under the umbrella.
Why does choosing the right one matter? In industrial settings, the wrong fastener means loosening under vibration, corrosion in outdoor environments, thread stripping under load, or catastrophic joint failure. The cost of a fastener failure is never the fastener itself — it's the downtime, rework, and safety risk that follow.
Types of Industrial Fasteners
Bolts & Hex Cap Screws
Bolts pair with a nut to clamp two or more parts together. Hex cap screws thread directly into a tapped hole. Both come in standard (inch) and metric versions, with grade markings on the head indicating tensile strength. Grade 5 and Grade 8 are the most common in industrial use; Grade 8 handles higher-stress applications like heavy machinery and structural connections.
Nuts
Nuts are internally threaded fasteners that mate with bolts. Common industrial types include:
- Hex nuts — general-purpose, the most widely used
- Nylon lock nuts — resist loosening under vibration (ideal for machinery and automotive)
- Flange nuts — distribute load over a wider surface, reducing damage to soft materials
- Jam nuts — thin nuts used as a secondary locking element
See our full guide on nylon lock nuts and flange nuts for application-specific details.
Washers
Washers distribute clamping load, prevent surface damage, and reduce friction. Flat washers are standard for load distribution. Split lock washers add spring tension to resist loosening. Nord-Lock washers use a wedge-locking system for the highest-vibration environments. Matching washer strength to bolt grade is essential — low carbon washers pair with Grade 2 or 5, high-alloy washers with Grade 8.
Screws
Self-tapping and self-drilling screws thread directly into material without a pre-tapped hole. Tek screws (self-drilling) are common in sheet metal and HVAC applications. Machine screws require a tapped hole or nut and are used in precision equipment and electronics panels.
Rivets
Rivets create permanent joints and are common in aerospace, automotive body panels, and structural steel. Pop rivets (blind rivets) install from one side, making them ideal when access to the back of a joint is limited.
Pins
Cotter pins, dowel pins, and roll pins secure components against rotation or axial movement. Cotter pins are especially common in automotive and agricultural equipment to lock castle nuts and clevis joints.
Specialty Fasteners
Industrial applications often require specialty hardware: plow bolts for snowplows and scrapers, U-bolts for pipe and tube clamps, structural bolts (A325/A490) for steel construction, and grease fittings for lubricated assemblies.
Industrial Fastener Materials
Material selection is as important as fastener type. The three main considerations are strength, corrosion resistance, and temperature tolerance.
| Material | Strength | Corrosion Resistance | Best For |
|---|---|---|---|
| Low Carbon Steel | Moderate | Low (needs coating) | General indoor use |
| Alloy Steel (Grade 5/8) | High | Low (needs coating) | High-load machinery |
| Stainless Steel (18-8, 316) | Moderate–High | Excellent | Outdoor, marine, food industry |
| Zinc-Plated Steel | Moderate | Good | General indoor/outdoor use |
| Hot-Dip Galvanized | Moderate | Very Good | Outdoor structural use |
| Brass | Low–Moderate | Excellent | Electrical, plumbing, decorative |
For marine or outdoor applications, 316 stainless steel offers the best corrosion resistance. For high-strength indoor applications, Grade 8 alloy steel is the standard. Zinc plating is a cost-effective middle ground for general industrial use.
Fastener Grades and Strength
Fastener grades define the tensile strength and yield strength of the material. In the US inch system:
- Grade 2 — low carbon steel, basic applications
- Grade 5 — medium carbon steel, 120,000 PSI tensile strength, common in automotive
- Grade 8 — medium carbon alloy steel, 150,000 PSI tensile strength, heavy equipment and structural
In the metric system, class markings (e.g., 8.8, 10.9, 12.9) appear on the bolt head. Class 8.8 is roughly equivalent to Grade 5; Class 10.9 and 12.9 exceed Grade 8 in strength.
Always match the nut grade to the bolt grade. A Grade 8 bolt with a Grade 2 nut defeats the purpose of the stronger bolt — the nut will fail first.
How to Choose the Right Industrial Fastener
Four questions determine the right fastener for any application:
1. What load does the joint carry?
Calculate shear and tensile loads. High-tensile applications (machinery, structural steel) require Grade 8 or metric Class 10.9+. General maintenance and light assemblies use Grade 5 or 8.8.
2. Is the joint permanent or removable?
Removable joints use threaded fasteners (bolts, screws, nuts). Permanent joints use rivets or weld studs. When maintenance access matters, threaded fasteners are always the right choice.
3. What is the environment?
Indoor and dry: zinc-plated or plain steel works well. Outdoor or high humidity: hot-dip galvanized or stainless steel. Marine or chemical exposure: 316 stainless steel or specialty coated fasteners.
4. Is vibration a concern?
Vibrating assemblies need locking features. Use nylon lock nuts, serrated flange nuts, Nord-Lock washers, or thread-locking adhesive to prevent self-loosening.
Where to Buy Industrial Fasteners
For most industrial buyers, the right supplier offers three things: deep inventory (so you can get standard and specialty sizes without back-order delays), expert product support, and a re-ordering system that keeps your shop stocked without manual effort.
At NutsandBolts.com, we stock thousands of industrial fasteners — from standard Grade 5 and Grade 8 hex cap screws to specialty plow bolts, metric Class 8.8 kits, and hard-to-find cotter pins. Our fastener assortment kits are built specifically for shops and fleet operations that need the right fastener on hand without waiting for a special order. We also offer B2B accounts with custom pricing, dedicated account support, and one-click reordering.
Browse our full fastener catalog or contact us — we're available 7 days a week.
Conclusion
Industrial fasteners are small components with large consequences. The difference between a Grade 5 and a Grade 8 bolt, or between a standard hex nut and a nylon lock nut, can mean the difference between a joint that holds for years and one that fails under load or vibration. Get the type, grade, material, and locking method right from the start — and work with a supplier who has what you need in stock.