Custom Bolts and Fasteners | National Bolt & Nut Corp (2022)

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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.

Bolt Head Types

There are a variety of bolt heads available. Each type of head accommodates different tools to hold the bolt in place or eliminate the need for a tool during tightening.

The most common bolt head types include:

  • Hex. The most common type of bolt head (replaced square bolt heads).
  • Bent. Eye bolt, J-bolt, and hook-bolt heads accommodate quick attachment to other components and cables.
  • Round. Round bolt heads usually require a screwdriver, Allen wrench, or Torx wrench to hold the bolt in place during tightening.
  • Carriage. These and similar types of round head bolts have a square neck under the head which eliminates the need for a tool on the head of the bolt during tightening.
  • T-Head. This type of head fits in a slot, eliminating the necessity for a tool during tightening.
  • Countersunk. Various types of countersunk heads draw the head of the bolt into the attaching component so it is flush to the mounting surface.

Bolt Grades

National Bolt and Nut can also supply fasteners in exotic material such as Aluminum, Brass, Bronze, Hastelloy, Silicon Bronze, and Titanium. NBN runs all grades of Stainless Steel including A286, 13-8PH, and 17-4PH.

Fastening Solutions from National Bolt & Nut

National Bolt & Nut Corporation provides high-quality standard and custom non-standard fasteners in varying grades, head types, and configurations. Contact us or request a quote to learn more about the full range of bolts we can provide.

Specifications

Industry Focus
Agricultural
Automotive
Construction
Electronics
Food Processing
Heavy Machinery
Marine
Mining
Nuclear
Oil, Gas, Petroleum
Energy
Medical
Transportation
Intended Application
Boilers
Bridges
Construction Machinery
Engineered Plumbing
Engines
Hydraulics
Impellers
Jewelry
Machine Tools
Water Treatment Plants
Materials (Metals)
Alloy Steels
Aluminum
Beryllium
Brass
Silicone Bronze
Carbon Steel
Magnesium
Molybdenum
Monel
Inconel
Nickel
Stainless Steel
Tin
Titanium
Materials (Plastic Polymers)
Various Plastics
Nylon
Standard
British
English
Metric
Hardening Specification
Heat Treated to any custom Specification
Fastener Types

*We can manufacture many custom fasteners to your specification*

Dowels & Pins
Hose Couplings
Nails
Rivets
Screws
Shackles
Shaft Couplings
Studs
Bolt Types

*We can manufacture many custom bolts to your specification*

Anchor
Bent
  • Eye
  • Hook
  • J
  • U
Carriage
Countersunk
Elevator
Lag
T-Handle
T-Slot
Flange
Carriage
Bent
Plow
Bolt & Screw Head Types

*We can manufacture many custom head types to your specification*

Binding
Button
Fillister
Flat
Flat Undercut
Headless
Hexagon
Indented Hexagon
One-Way
Oval
Pan
Pentagon
Phillips
Round
Shoulder
Square Shoulder
Socket
Trimmed Hex
Truss
12-Point
Thread Types

*We can manufacture many custom thread types to your specification*

ACME
Drywall
Machine
Self-Tapping
Self-Drilling Drive Screws
Self-Drilling
Type 17
Type 23
Type 25
Type A
Type AB
Type B
Type F
Wood
UNC
UNF
Grades

*We can manufacture to many custom grades meeting your specification*

2
5
8
8.8
10.9
12.9
Bolt & Screw Drive Types

*We can manufacture many custom drive types to your specification*

Combination
Hex/Hexagonal
Phillips
Six Lobe
Slotted
Socket
Square
Tamper Resistant
Torx
Nut Types

*We can manufacture many custom nut types to your specification*

2-Way
Anchor
Cap
Castle
Conical
Coupling
Finished Hex
Flex Lock
Heavy Hex
Hex Flange
Hex Jam
Keps
Nylon Insert
Nylon Patch
Nylon Pellet
Semi-Finished Hex
Serrated Hex Flange
Slotted Hex
Square
Thumb
Top Lock
Wing
Finish
Automotive
Black Oxide
Brass Plated
Cadmium
Chromate
Chrome
Color Coated
Galvanized
Nickel Plated
Painted
Phosphate
Polished
PTFE
Silver Plated
Zinc Plated
Industry Standards
ANSI - American National Standards Institute
  • ANSI B 18.2.4 2M
  • ANSI B 28.2.4 1M
DIN
  • DIN 934
  • DIN 970
ISO - International Organization for Standardization
  • ISO 4032
  • ISO 4033
UTS - Unified Thread Standard
  • UNC
  • UNF
  • UNEF
  • UNS
  • NPT
  • NPTF

Production Volume
Min
$60
Low Volume to High Volume
Max
Several Million units
File Formats
AutoCAD (DWG, DWZ)
BMP - Bit Mapped Graphics
Catia (CATDrawing, CATPart)
Delcam (DGK, DMT)
DXF - Drawing Interchange Format, or Drawing Exchange Format
GIF - Graphics Interchange Format
IGES - Initial Graphics Exchange Specification, ANSI file format.
Inventor (IDW, IPT)
IronCAD (ICD, ICS)
JPG or JEPG - Joint Photographic Experts Group
MasterCam (MDX, MC8, MC9, SET)
PDF - Portable Document Format
Pro-E or Pro/Engineer (DRW, PRT, XPR)
SAT
3D ACIS Model File
SolidWorks (SLDPRT, SLDDRW, SLDDRT)
STEP - Standard for the Exchange of Product Model Data
SurfCam (DSN)
TIFF - Tagged Image File Format
Diameter
Min
M2
#4
Max
M80
4 in

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