Nuts
Product Range
Ideal for panel fastening and automotive applications, offering easy installation and strong hold
U clip nut
Used in conjunction with a cotter pin for secure locking, perfect for automotive applications
Castle Nut
Big surface area to distribute load better, ideal for building, structural applications
Heavy Hex Nut
Top locking mechanism for applications where vibration or movement is a concern
Top Lock Nut
Ideal for panel fastening and automotive applications, offering easy installation and strong hold
Used in conjunction with a cotter pin for secure locking, perfect for automotive applications
Big surface area to distribute load better, ideal for building, structural applications
Top locking mechanism for applications where vibration or movement is a concern
U clip nut
Castle Nut
Heavy Hex Nut
Top Lock Nut
Nylon insert for a secure hold, Nylon preventing loosening under vibrations, Nylon lock nut
Nylon Lock Nut
A flange at the base for distributing the pressure over a larger area, used for automotive and machinery
Hex Flange Nut
A polished look and protects against injury or thread damage by covering exposed threads
Cap Nut
A greater surface in contact with the part being fastened, ideal for applications where a wrench can’t be used
Square Nut
Nylon insert for a secure hold, Nylon preventing loosening under vibrations, Nylon lock nut
A flange at the base for distributing the pressure over a larger area, used for automotive and machinery
A polished look and protects against injury or thread damage by covering exposed threads
A greater surface in contact with the part being fastened, ideal for applications where a wrench can’t be used
Nylon Lock Nut
Hex Flange Nut
Cap Nut
Square Nut
Your Trusted Supplier of Nut Needs
Shanghai Hengrui Industrial Co., Ltd is a custom nut manufacturer with 15 years experience, is specializing in the manufacturing and exporting of bolts, screws, nuts, washers, and custom non-standard products, with many different materials, like carbon steel, stainless steel, brass, aluminum, titanium, special alloy steel, etc.
Your Buying Guide to Procuring Nuts
When you buy nuts for industrial fastening, you need to consider more than size and price. This guide helps you understand nut types, thread systems, standards, strength grades, proof load stress, material options and assembly matching, so you can communicate your requirements more clearly with the manufacturer.
What is Nut?
Nut is a type of fastener with a threaded hole, always used with bolts to fasten two or more objects by threads. The nut and bolt are kept together by their threads’ friction (with slight elastic deformation), a slight stretching of the bolt, and compression of the parts to be held together.
Nut Thread type: M/UNC/UNF
Nut threads must match the mating bolt, stud or threaded rod. Metric threads are common in DIN and ISO systems, while UNC and UNF threads are widely used in inch-based markets. Before placing a bulk nut order, you should confirm thread size, pitch and standard to avoid assembly problems.
| DIN ( M ) | |||
|---|---|---|---|
| Diameter (mm) | Pitch (mm) | Diameter (mm) | Pitch (mm) |
| M6 | 1 | M24 | 3 |
| M8 | 1.25 | 2 | |
| 1 | M27 | 3 | |
| M10 | 1.5 | 2 | |
| 1.25 | M30 | 3.5 | |
| 1 | 2 | ||
| M12 | 1.75 | M33 | 3.5 |
| 1.25 | 2 | ||
| 1.5 | M36 | 4 | |
| M14 | 2 | 3 | |
| 1.5 | M42 | 4.5 | |
| M16 | 2 | 3 | |
| 1.5 | M45 | 4.5 | |
| M18 | 2.5 | M48 | 5 |
| 2 | 3 | ||
| 1.5 | M52 | 5 | |
| M20 | 2.5 | M56 | 5.5 |
| 2 | 4 | ||
| 1.5 | |||
| M22 | 2.5 | ||
| 2 | |||
| 1.5 | |||
| ANSI, ASME, IFI ( UNC/UNF ) | |||
|---|---|---|---|
| Diameter (Inch) | Pitch (Threads Per Inch) | Diameter (Inch) | Pitch (Threads Per Inch) |
| 1/4- | 20UNC | 7/8- | 9UNC |
| 28UNF | 14UNF | ||
| 5/16- | 18UNC | 1" | 8UNC |
| 24UNF | 12UNF | ||
| 3/8- | 16UNC | 1-1/8- | 7UNC |
| 24UNF | 8UNF | ||
| 7/16- | 14UNC | 1-1/4- | 7UNC |
| 20UNF | 8UNF | ||
| 1/2- | 13UNC | 1-3/8- | 6UNC |
| 20UNF | 8UNF | ||
| 9/16- | 12UNC / 18UNF | 1-1/2- | 6UNC |
| 5/8- | 11UNC | 8UNF | |
| 18UNF | 1-3/4- | 5UNC | |
| 3/4- | 10UNC | 8UNF | |
| 16UNF | |||
Nut Dimension Standard
Nut standards define dimensions, thread requirements, mechanical properties and compatibility with mating fasteners. Common standards include ASTM A563, ASTM A194, SAE J995, ISO 898-2, DIN934 and ASME B18.2.2. Choosing the right grade helps ensure the nut matches the bolt strength and application load.
| Nut Type | Nut Standard |
|---|---|
| Hex Nut | ASTM B18.2.2, DIN934 |
| Heavy Hex Nut | ASTM B18.2.2, DIN6915 |
| Square Nut | ASME/ANSI B18.2.2; DIN557, DIN562 |
| Hex Flange Nut | ASTM B18.2.2, ASTM B18.16.4, DIN6923 |
| Hex Nylon Insert Nut | ASME/ANSI B18.16.6; DIN985, DIN982 |
| All Metal Lock Nut | ASME B18.16.6, DIN980V, DIN980M, DIN6925 |
| Castle Nut | ASME/ANSI B18.2.2; DIN935 |
| Cap Nut | SAE J483, DIN1587, DIN917 |
| Clip Nut | QC 312 |
| Hex Coupling Nut | ASTM B18.2.2, DIN6334 |
Nut Grade specification
| Standard for Nut | Grade | Hardness | Dimensional Style of Nut | Nominal Nut Size | Proof Load Stress (ksi) | |
|---|---|---|---|---|---|---|
| in. | Non-Zinc Coated Nuts | Zinc Coated Nuts | ||||
| A563 | A | HRB68-HRC32 | Hex | 1/4 to 1-1/2 | 90 | 68 |
| Heavy Hex | 1/4 to 4 | 100 | 75 | |||
| Hex Thick | 1/4 to 1-1/2 | |||||
| B | HRB69-HRC32 | Hex | 1/4 to 1 | 120 | 90 | |
| 1-1/8 to 1-1/2 | 105 | 79 | ||||
| Heavy Hex and Hex Thick | 1/4 to 1 | 133 | 100 | |||
| 1-1/8 to 1-1/2 | 116 | 87 | ||||
| C/C3 | HRB78-HRC38 | Heavy Hex | 1/4 to 4 | 144 | 144 | |
| D | HRB84-HRC38 | Hex | 1/4 to 1-1/2 | 135 | 135 | |
| Heavy Hex | 1/4 to 4 | 150 | 150 | |||
| Hex Thick | 1/4 to 1-1/2 | 150 | 150 | |||
| DH | HRC24-HRC38 | Hex | 1/4 to 1-1/2 | 150 | 150 | |
| Heavy Hex | 1/4 to 4 | 175 | 150 | |||
| Hex Thick | 1/4 to 1-1/2 | 175 | 175 | |||
| DH3 | HRC24-HRC38 | Heavy Hex | 1/4 to 4 | 175 | 150 | |
| A194 | Heavy Hex | 1/4 to 4 | 150 | 150 | ||
| 2H | ≤1-1/2: 248-352; >1-1/2: 212-352 | Hex | 1/4 to 1-1/2 | 150 | 150 | |
| Heavy Hex | 1/4 to 4 | 175 | 175 | |||
| 2HM | HRB159-235 | Hex | 1/4 to 1-1/2 | 135 | 135 | |
| Heavy Hex | 1/4 to 4 | 150 | 150 | |||
| 4 | 248-327 | Hex | 1/4 to 1-1/2 | 150 | 150 | |
| Heavy Hex | 1/4 to 4 | 175 | 175 | |||
| 7 | 248-327 | Hex | 1/4 to 1-1/2 | 150 | 150 | |
| Heavy Hex | 1/4 to 4 | 175 | 175 | |||
| 7M | HRB159-235 | Hex | 1/4 to 1-1/2 | 135 | 135 | |
| Heavy Hex | 1/4 to 4 | 150 | 150 | |||
| 8 | 126-300 | Hex | 1/4 to 1-1/2 | 75 | 75 | |
| Heavy Hex | 1/4 to 4 | 80 | 80 | |||
| 8M | 126-300 | Hex | 1/4 to 1-1/2 | 75 | 75 | |
| Heavy Hex | 1/4 to 4 | 80 | 80 | |||
| SAE J995 | 2 | HRC32 max | Hex | 1/4 to 1-1/2 | 90 | 90 |
| 5 | HRC32 max | Hex | 1/4 to 1 | 120 | 120 | |
| 1-1/8 to 1-1/2 | 105 | 105 | ||||
| 8 | 24-32HRC | Hex | 1/4 to 5/8 | 150 | 150 | |
| 26-34HRC | 3/4 to 1 | |||||
| 26-36HRC | 1-1/8 to 1-1/2 | |||||
| ISO 898-2 2009 (DIN934) | 4 | over M16 117-302HV | 510MPa | |||
| 6 | up to M16 15-302HV, over M16 170-302HV | 600-720MPa | ||||
| 8 | M4 180-302, up to M16 200-302(HRB94-31.5), up to M39 233-353HV | 800-920MPa | ||||
| 10 | 272-353HV | 1040-1060MPa | ||||
| 12 | 272-353HV | 1140-1170MPa | ||||
How to Match Nuts with Bolts, Studs and Washers?
To match nuts correctly, you should check thread type, thread size, grade, material, coating thickness and standard compatibility. A high-strength bolt may require a matching high-strength nut and washer, while hot dip galvanized assemblies may need proper thread allowance and compatible coated components.
How to Choose Nut Material and Surface Finish?
Choose nut material and surface finish according to strength requirement, corrosion exposure and installation environment. Carbon steel nuts are used for general industrial fastening, alloy steel nuts for higher strength, and stainless steel nuts for corrosion resistance. Zinc plating and hot dip galvanizing are common surface treatments for different protection needs.
Ask For Quote Now!
- Get free sample!! Contact us today
- We will contact you within 12 hours
