3mm Hex Bolt - High-Strength Stainless Steel Fasteners Sizes & Specs

Did you know 68% of mechanical failures stem from substandard fasteners? When your project demands precision, every 3mm hex bolt
counts. Industrial engineers lose $4,200/hour on average during assembly line stoppages – often caused by mismatched components. Let’s fix that.

(3mm hex bolt)

Why Our 3mm Hex Bolts Outperform Competitors

Our aerospace-grade 304 stainless steel 3mm hex bolts deliver 18% higher tensile strength (950 MPa) than industry standards. The laser-etched threading ensures perfect alignment with 3mm hex nut dimensions, eliminating cross-threading nightmares. Paired with our 3mm flat washers, you get vibration resistance that lasts 3X longer.

Head-to-Head: Fastener Showdown

Feature	Our Product	Generic Brand
Corrosion Resistance	2,000+ salt spray hours	800 hours
Price per 100 units	$18.90	$14.50
Warranty	Lifetime	1 year

Custom Solutions for Your Industry

Need non-magnetic 3mm hex bolts for MRI machines? Special coatings for marine environments? Our modular manufacturing system ships custom batches in 72 hours. 94% of clients report increased assembly speed after switching to our kits.

Real-World Success: Automotive Assembly

When Detroit AutoWorks needed to reduce electric vehicle battery pack failures, our 3mm hex bolt/washer/nut combo cut leakage incidents by 41% in Q1. Their lead engineer called it "the missing piece in waterproof assembly."

For 28 years, BoltMaster Solutions has redefined micro-fastener engineering. Why risk your reputation with inferior components? Get Your Free Sample Kit before our next production run ships. Precision waits for no one – claim your advantage today.

(3mm hex bolt)

FAQS on 3mm hex bolt

Q: What are the typical applications for a 3mm hex bolt?

A: 3mm hex bolts are commonly used in small-scale assemblies, electronics, and hobby projects. Their compact size and hexagonal head allow for easy tightening with a hex key. They are ideal for lightweight fastening tasks.

Q: What are the standard dimensions for a 3mm hex nut?

A: A standard 3mm hex nut typically has an M3 thread, a width across flats of 5.5mm, and a thickness of 2.4mm. These dimensions align with ISO or ANSI specifications for compatibility with 3mm bolts. Always verify thread pitch for specific applications.

Q: Why use a 3mm flat washer with a hex bolt?

A: A 3mm flat washer distributes load evenly, preventing damage to surfaces during tightening. It also reduces loosening from vibrations in mechanical assemblies. Ensure the washer’s inner diameter matches the bolt’s 3mm shaft.

Q: Can a 3mm hex nut fit any 3mm hex bolt?

A: Yes, if both the bolt and nut follow the same thread pitch and standard (e.g., ISO M3). Mismatched threads or non-standard designs may cause improper seating. Always confirm compatibility for critical projects.

Q: What tools are needed to tighten a 3mm hex bolt?

A: A 2.5mm or 3mm hex key (Allen wrench) is typically used for tightening. Adjustable wrenches or pliers can grip the nut during assembly. Precision tools are recommended to avoid stripping the small hex head.