316 Stainless Steel Bolts Uses & Applications
What Are 316 Stainless Steel Bolts?
316 stainless steel bolts are high-grade fasteners made from marine-grade austenitic stainless steel (also known as A4 or UNS S31600). This alloy includes significant amounts of chromium and nickel, plus 2–3% molybdenum, which enhances corrosion resistance, especially in chloride-rich environments.
At The Monster Builder, we understand the demands of harsh and highly corrosive environments especially in Singapore’s humid, maritime climate and that’s why 316 stainless steel bolts are often a preferred choice for many of our CNC machined and fabricated metal projects.
What Are 316 Stainless Steel Bolts?
When selecting fasteners for demanding environments, it’s important to choose a material that balances strength, durability, and corrosion resistance. 316 stainless steel bolts are widely trusted for applications where ordinary steel or 304 stainless might fail. Here’s a clear breakdown of their advantages and limitations:
Pros of 316 Stainless Steel Bolts
- Superior Corrosion Resistance – Resists pitting and rust in marine, coastal, and chemical environments.
- High Mechanical Strength – Maintains durability under heavy loads and across temperature variations.
- Excellent Weldability – 316L variants allow for safe welding without corrosion at heat-affected zones.
- Long Service Life – Reduces maintenance and replacement costs over time.
- Aesthetic & Non-Magnetic (Annealed) – Ideal for visible architectural applications and projects requiring non-magnetic properties.
Cons of 316 Stainless Steel Bolts
- Higher Cost – More expensive than standard stainless steels like 304 due to molybdenum content.
- Galling Risk – Threads can seize under high friction if not properly lubricated or torqued.
- Reduced Strength at Very High Temperatures – Not ideal for extreme heat applications above recommended limits.
- Heavier than Some Alternatives – Density may be a concern for weight-sensitive designs.
Uses of 316 Stainless Steel Bolts
316 stainless steel bolts are chosen for applications where corrosion resistance, durability, and strength are critical. Their versatile properties make them suitable for a wide range of industries, from marine environments to medical equipment. Common uses include:
- Marine Applications – Ideal for boats, docks, and coastal structures where exposure to saltwater can cause rapid corrosion.
- Chemical & Petrochemical Plants – Resists aggressive chemicals, acids, and high-humidity industrial settings.
- Food, Pharmaceutical & Medical Equipment – Suitable for hygienic and sterile environments due to biocompatibility and corrosion resistance.
- Power Generation & Heat Exchangers – Handles thermal cycling and high-stress conditions effectively.
- Architectural & Structural Applications – Perfect for outdoor structures or fixtures exposed to weather, pollution, or salty air.
What Is 316 Stainless Steel Made Of?
316 stainless steel is a high-grade austenitic stainless steel known for its excellent corrosion resistance and durability. It is primarily made of iron, with 16–18% chromium for rust protection, 10–14% nickel for strength and toughness, and 2–3% molybdenum to resist pitting in chloride-rich environments.
A low-carbon variant called 316L is also available, which reduces the risk of corrosion during welding, making it ideal for marine, chemical, and medical applications where reliability and longevity are crucial.
Common Sizes & Forms of 316 Stainless Steel Bolts
316 stainless steel bolts come in a wide variety of sizes, threads, and standards to suit different applications.
- Diameter range: M3 to M64 for metric, and from #4 to 2.5″ for imperial.
- Standards: Metric coarse/fine, UNC / UNF threads; ISO, DIN, ASME standards.
- Length: Bolts can vary from a few mm (or inches) to hundreds of mm, depending on design needs.
For examples:
- M8 × 16 mm 316 SS bolt — compact bolt commonly used in chassis or machinery.
- RS PRO A4/316 M6 machine screw — smaller size, good for precision assemblies.
- A4/316 Hex Bolt DIN 931 — typical hex head bolt used in structural or mechanical applications.
Pricing of 316 Stainless Steel Bolts
Local Market Prices:
- M6 × 25 mm A4 (316) Hex Bolt from RS Singapore — around SGD 0.39 each (in bulk) for 1‑bag orders.
M10 × 25 mm A4 (316) Hex Bolt from RS Singapore — about SGD 0.78 to 0.83 per bolt, depending on quantity. - HWC SS316 Hexagon Bolt + Nut (M6 × 75 mm) — a 2-piece pack costs S$4.90.
- HWC SS316 Hexagon Bolt + Nut (M6 × 25 mm) — 10‑piece pack is S$4.90.
- Hex Bolt / Fastener Supplier (Vision Alloys, SG) — their bolt pricing starts from ~ SGD 0.08 to SGD 0.25 per piece, depending on size & material.
- Hex Bolt, Fully-Threaded, 316L (Misumi) — e.g., M6 × 30 mm is SGD 0.79 per piece.
Because pricing changes, for bulk or custom CNC‑machined 316 bolts, it’s best to request a quote from The Monster Builder, we can provide competitive pricing, lead time, and material certification.
316 Stainless Steel Bolts Supplier in Singapore
316 stainless steel bolts are the ideal choice when strength, durability, and corrosion resistance are essential. From marine and chemical applications to architectural and industrial projects, their performance ensures long-lasting results.
At The Monster Builder, we specialize in metal fabrication and supply high-quality 316 stainless steel bolts tailored for Singapore businesses and projects of all sizes. Whether you need standard bolts or custom CNC‑machined fasteners, we deliver precision, reliability, and fast turnaround times.
Contact us today to discuss your requirements, request a quote, or explore our range of 316 stainless steel bolts for your next project. Trust The Monster Builder for expert fabrication and top-quality fasteners in Singapore.
