What is a Hex Nut? Sizes 5/16, M14, 4 Explained & Uses

(what is a hex nut)

Engineering Excellence: Why Our Hex Nuts Outperform

While generic hex nuts fail at 75% max torque capacity, our ISO 4032-certified products deliver:

• ✔️ 92% corrosion resistance (salt spray test: 1,200 hrs)
• ✔️ 4 hex nut variants in titanium alloy
• ✔️ M14 hex nut tensile strength: 1,200 MPa

Head-to-Head: Hex Nut Showdown

Feature	Our 5/16-18 Hex Nut	Competitor A
Cycle Life	50,000+ cycles	32,000 cycles
Temperature Range	-60°F to +900°F	-30°F to +600°F

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Q: What is a hex nut?

A: A hex nut is a six-sided fastener with internal threads, designed to secure bolts or screws. Its hexagonal shape allows easy tightening using wrenches or sockets. It is commonly used in construction, machinery, and automotive applications.

Q: What is a 5/16-18 hex nut?

A: A 5/16-18 hex nut has a 5/16-inch diameter and 18 threads per inch, matching UNC (Unified National Coarse) standards. It is used with compatible bolts for medium-duty applications. Common materials include stainless steel and zinc-plated steel.

Q: What are M14 hex nuts used for?

A: M14 hex nuts are metric nuts with a 14mm thread diameter, often used in automotive and industrial machinery. They provide strong fastening for heavy-duty components. These nuts comply with ISO standards for global compatibility.

Q: What does a 4 hex nut mean?

A: A 4 hex nut typically refers to a size compatible with a 4 screw (approx. 0.112-inch diameter). It is used in lightweight assemblies like electronics or furniture. The exact dimensions may vary by regional standards.

Q: How do I choose between 5/16-18 and M14 hex nuts?

A: Choose based on the bolt’s thread type: 5/16-18 suits imperial/UNC bolts, while M14 fits metric bolts. Consider load requirements—M14 handles heavier loads. Always verify thread pitch and application environment.