Heavy Equipment/Construction
Heavy equipment and construction industries demand hardware that can handle high loads, repeated stress, and harsh environments. National Bolt & Nut Corporation supplies construction fasteners that meet the demands of these industries with strength, precision, and durability. These fasteners are built to support everything from infrastructure builds to off-road machinery.

Built for Demanding Jobs
Construction fasteners from National Bolt & Nut are manufactured to meet exact specifications for strength, performance, and fit. Whether you’re working with steel beams, concrete forms, or mechanical assemblies, consistent fastening is critical. Our offerings include both standard parts and custom fasteners that can meet application-specific demands. From high-strength structural bolts to heavy-duty lock nuts, every product is produced to match technical drawings and jobsite needs.

Fastener Product Range
We supply a full range of construction fasteners for heavy-duty projects:

• Heavy Hex Cap Screws – Available in long lengths, ideal for structural connections.
• Flange Bolts & 12-Point Bolts – Suitable for heavy machinery and rotating equipment.
• Heavy Hex Nuts & Lock Nuts – Options include all-metal and nylon insert designs.
• Structural Washers – Thru-hardened and compliant with ASTM F436.
• Plow Bolts – Common in earth-moving and heavy equipment assemblies.

Each part is produced for high strength and dimensional consistency, helping contractors, engineers, and maintenance professionals meet tight project deadlines and safety requirements.

Custom Fasteners Built to Your Specs
Standard components don’t always fit complex designs or field conditions. That’s why we support the production of custom fasteners. Whether your project calls for a non-standard thread pitch, unusual head style, or oversized dimension, our in-house team can manufacture to match the job’s needs. This service is especially useful for OEMs, retrofit projects, or construction sites where space constraints or performance issues require special designs.

We provide custom fasteners to match your special specifications and supply metric fasteners in grades 10.9 and 12.9 from M6 to M100. This service is especially useful for OEMs, retrofit projects, or construction sites where space constraints or performance issues require special designs.

Corrosion Resistance and Specialty Materials
Certain projects require fasteners that can hold up in aggressive environments. Salt, moisture, chemicals, and high temperatures can degrade standard hardware over time. For those conditions, we manufacture custom Hastelloy fasteners. Hastelloy provides excellent corrosion resistance, especially in chemical plants, marine structures, or refineries. These fasteners support long-term performance and reduce maintenance costs for operators who work in some of the most demanding areas.

Applications We Support
Construction fasteners from National Bolt & Nut are used across a wide range of heavy-duty applications:

• Commercial buildings and bridges
• Mining and oilfield machinery
• Road and rail infrastructure
• Earth-moving and excavation equipment
• Power plants and processing facilities

These fasteners play a key role in structural integrity, equipment uptime, and site safety. Projects that rely on vibration resistance, torque control, and thermal stability benefit from fasteners built to hold up under real-world conditions.

Quality and Performance
All construction fasteners are produced under strict quality protocols. Material traceability, lot control, and in-house inspection help guarantee consistency from first part to last. Certifications are available to support project submittals or compliance documentation. Our team is experienced in working with procurement teams, project engineers, and OEMs on fastener selection and specification.

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CUSTOM BOLTS AND FASTENERS
Our bolts are used by a broad range of industries requiring assemblies and fastening applications. These threaded fasteners can connect machine parts, mount equipment, and more. As a removable fastener, they also facilitate the regular maintenance and inspections that keep equipment running longer.

National Bolt & Nut Corporation offers both standard and custom bolts and fasteners to meet different grades and specifications. This ensures we can cover the full spectrum of our manufacturing customers' applications, including

• Mining
• Heavy equipment
• Construction
• Transportation
• Automotive
• Energy and alternative energy

TYPES OF BOLTS:

ANCHOR
Sometimes referred to as an L-bolt, the anchor bolt is common in concrete and masonry construction. When embedded in concrete structures or masonry fills, these bolts attach components and integral equipment to the solid structure of the building.

BENT
Bent bolts can be further broken down into the following categories based on the way they are bent and their intended application:

• Eye bolts. The head of these bolts forms a full circle-like the eye of a needle-allowing for the attachment of cables, ropes or other fasteners.
• Hook bolts. The unthreaded end of this bolt forms a hook shape that may range from a simple L-shape to more complex custom bends.
• J-bolts. These J-shaped bolts typically act as a hook, facilitating easy attachment and detachment from other components or structures, often in combination with eye-bolts.
• U-Bolts. This bolt is bent into the shape of a U with both ends threaded, enabling users to secure pipes or tubes to other components or structures.

CARRIAGE
Carriage bolts are commonly used to attach wood to metal. The carriage bolt may be distinguished by a square formation located under its smooth, rounded bolt head. This shape helps prevent it from turning during tightening.

COUNTERSUNK
Countersunk bolts have a sloped shoulder on the head, allowing them to fasten while leaving the head of the bolt flush with the attached surface. This provides a smoother exposed finish and allows moving parts to function within tight clearances.

ELEVATOR
This type of bolt includes characteristics of both carriage bolts and countersunk bolts. The head is undercut with a square shape to hold it in place during tightening, but it has a thinner head that can be made flush or near-flush with the attached surface.

LAG
These bolts include threads on only a portion of the bolt. This lack of threads is known as a lag. It facilitates a smooth surface attachment to wood, while the threaded end is more like a wood screw rather than a typical bolt thread designed to receive a nut.

T-HANDLE
When a bolt requires frequent handling by an operator without the use of a tool, a t-handle bolt is often the best option. These bolts have an extended head in the shape of a T, allowing for hand tightening or loosening.

T-SLOT
This type of bolt has a T-shaped head, but is not meant to facilitate tightening and loosening by hand. Instead, the T shape of this bolt fits into a slot in the attachment surface so that the bolt will not turn during tightening.

FLANGE
Sometimes called frame bolts, flange bolts are common for load bearing applications. The heads of these bolts are undercut with an integrated flanged washer face located under the head to distribute stress from a load over a broader area.

PLOW
A plow bolt combines a number of distinguishing features from other bolts into a durable fastener often used in structural situations. Plow bolts include a countersunk head, allowing flush mounting while undercutting the head with a square shank neck to hold the bolt in place during tightening.

Watch>>>Fastener Material Selection and Plating Guide
Learn how to choose the best Fastener Material & Finish for your project, what are the different Materials Properties, what is Galvanic Corrosion and more here

National Bolt & Nut, Inc.
National Bolt & Nut, Inc. (NBN) is a Domestic Manufacturer of large diameter custom non-standard fasteners for critical care applications.

NBN supplies Bolts, Nuts, Studs and Washers to the Agricultural, Energy, Heavy Equipment, Mining, Petrochemical, and Rock Crushing industries.

We have provided "blue print specials" since 1996 in all grades of steel and exotic materials.
Our ISO compliant Quality Program challenges NBN to identify ways to best serve ever changing customer needs. All fasteners are manufactured to ASME, ASTM, DIN, ISO and to customers proprietary standard specifications.

NBN guarantees to offer custom quality fasteners at the best price with the fastest industry lead times available.