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Custom Nuts and Washers

National Bolt & Nut Corporation manufactures a broad selection of custom nuts and washers that meet various applications and market needs. If an application requires a custom nut, National Bolt & Nut can deliver with our variety of design options.

Types of Nuts Available

Our expert team has the knowledge, skills, and equipment needed to manufacture a variety of custom-tailored nuts in low to high production volumes. The types of custom nuts we offer are:

  • Two-way: Reversible
  • Anchor: Best for applications where access to one side of a structure is limited
  • Cap: Domed end on one side
  • Castle: Castellated with slots cut into one end
  • Conical: Tapered
  • Coupling: Threaded to join two male threads
  • Finished hex: Six-sided to ensure bolt stays in place
  • Flex lock: Resist impact and shock
  • Heavy hex: Larger and thicker for large-diameter bolts
  • Hex flange: Wide flange on one end to distribute pressure
  • Hex jam: Thinner with flat corners
  • Keps: Free-spinning washer attached for easier assembly
  • Nylon insert: Inner-diameter insert to resist turning
  • Nylon patch: Nylon covering in inner diameter for increased grip
  • Nylon pellet: Uses smaller nylon insert to provide seal
  • Semi-finished hex: Six-sided nut with only the thread and bearing surface machined
  • Serrated hex flange: Non-spinning washers attached at bottom
  • Slotted hex: Six-sided with locking mechanism slots
  • Square: Four-sided nuts with greater resistance to loosening
  • Thumb: Knurled outside surface for easier manual tightening
  • Top lock: Deformed top thread section acting as locking “zone”
  • Wing: Contains two metal wings for easier manual tightening

All of these can be manufactured to English, British, or metric sizing standards and a wide range of industry standards, including DIN, ANSI, IFI, ISO, JIS, SAE, and ASTM.

Custom Nuts - Materials and Finishes

Material selection for your component is important, as different physical and chemical characteristics can improve the performance of your application greatly. Let our team help you select the right material to ensure your part meets the requirements and restrictions of the application.

The materials we offer for our custom nut solutions are:

  • Alloy steels
  • Aluminum
  • Beryllium
  • Brass
  • Silicone bronze
  • Carbon steel
  • Magnesium
  • Molybdenum
  • Monel
  • Inconel
  • Nickel
  • Stainless steel
  • Tin
  • Titanium
  • Various plastics
  • Nylon

In addition to our manufacturing capabilities, we also offer treatment and finishing services to facilitate the delivery of a strong and durable nut. For example, we provide heat treatment to enhance the nut's hardness and a range of finishes-from automotive and black oxide to silver and zinc plating-to improve the nut's functional and aesthetic qualities.

Common Industrial Applications

Our custom nuts find use across a diverse set of industries. Some of the most common industrial applications for our custom nuts include:

  • Boilers
  • Bridges
  • Construction machinery
  • Engineered plumbing
  • Engines
  • Hydraulics
  • Impellers
  • Jewelry
  • Machine tools
  • Water treatment plants

Similar to our custom nuts, our custom washers are available in a variety of materials with different finishes and standards compliances to suit various customer needs.

Types of Washers Available

The types of washers we custom manufacture are:

  • Beveled: Angled for structural applications
  • Flange: Raised inside diameter
  • Flat: Used to increase the bearing surface of a nut or fastener’s head
  • Hardened: Provide tightness to joints and distribute pressure
  • Lock: Prevents nuts from turning and slipping
  • Plastic: Offer vibration resistance and can withstand exposure to certain chemicals
  • Shoulder: Provides insulation and reduces vibration
  • Spring: Offer axial flexibility to prevent loosening
  • Wave: Compensating spring to absorb shock

National Bolt & Nut: Your Source for Quality Fasteners

National Bolt & Nut Corporation manufactures a wide range of standard nuts and washers to accommodate various industrial applications. However, when an off-the-shelf product does not meet the unique specifications of an application, we offer custom-tailored fastener solutions.

For additional information on the types of fasteners we have available, visit our complete guide on fasteners. To learn more about our custom nuts and washers or partner with us for your fastener needs, contact us or request a quote today.

Custom Nuts at National Bolt & Nuts

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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