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. Please 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:

USS Flat Washers

Helical Spring Lock Washers

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.

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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