Dizon Engineering Design Consultancy

💡 𝗗𝗶𝗱 𝗬𝗼𝘂 𝗞𝗻𝗼𝘄?
Not all bolts used in 𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗮𝗹 𝘀𝘁𝗲𝗲𝗹 𝗰𝗼𝗻𝘀𝘁𝗿𝘂𝗰𝘁𝗶𝗼𝗻 are the same. Selecting the correct bolt type is critical to ensure 𝘀𝘁𝗿𝗲𝗻𝗴𝘁𝗵, 𝘀𝗮𝗳𝗲𝘁𝘆, 𝗮𝗻𝗱 𝗰𝗼𝗱𝗲 𝗰𝗼𝗺𝗽𝗹𝗶𝗮𝗻𝗰𝗲 of steel connections.

🔩 𝗖𝗼𝗺𝗺𝗼𝗻 𝗔𝗦𝗧𝗠 𝗦𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗮𝗹 𝗕𝗼𝗹𝘁 𝗧𝘆𝗽𝗲𝘀

1️⃣ 𝑨𝑺𝑻𝑴 𝑨307 – 𝑳𝒐𝒘 𝑪𝒂𝒓𝒃𝒐𝒏 𝑺𝒕𝒆𝒆𝒍

- Tensile strength: 𝟰𝟱 𝗸𝘀𝗶
- Typically used for 𝘀𝗲𝗰𝗼𝗻𝗱𝗮𝗿𝘆 𝗼𝗿 𝗻𝗼𝗻-𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗮𝗹 𝗺𝗲𝗺𝗯𝗲𝗿𝘀
- 𝗡𝗼𝘁 𝗿𝗲𝗰𝗼𝗺𝗺𝗲𝗻𝗱𝗲𝗱 for primary load-bearing connections

2️⃣ 𝑨𝑺𝑻𝑴 𝑨325 – 𝑯𝒊𝒈𝒉-𝑺𝒕𝒓𝒆𝒏𝒈𝒕𝒉 𝑴𝒆𝒅𝒊𝒖𝒎 𝑪𝒂𝒓𝒃𝒐𝒏 𝑺𝒕𝒆𝒆𝒍

- Tensile strength: 𝟵𝟬 𝗸𝘀𝗶
- The 𝗺𝗼𝘀𝘁 𝗰𝗼𝗺𝗺𝗼𝗻𝗹𝘆 𝘂𝘀𝗲𝗱 𝗯𝗼𝗹𝘁 in building construction
- Suitable for 𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗮𝗹 𝗰𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗼𝗻𝘀 subjected to significant loads

3️⃣ 𝑨𝑺𝑻𝑴 𝑨490 – 𝑯𝒊𝒈𝒉-𝑺𝒕𝒓𝒆𝒏𝒈𝒕𝒉 𝑯𝒆𝒂𝒕-𝑻𝒓𝒆𝒂𝒕𝒆𝒅 𝑺𝒕𝒆𝒆𝒍

- Tensile strength: 𝟭𝟭𝟯 𝗸𝘀𝗶
- 𝗦𝘁𝗿𝗼𝗻𝗴𝗲𝗿 𝘁𝗵𝗮𝗻 𝗔𝟯𝟮𝟱, allowing fewer bolts in some connections
- Higher cost, typically used where 𝗵𝗶𝗴𝗵𝗲𝗿 𝗰𝗮𝗽𝗮𝗰𝗶𝘁𝘆 𝗶𝘀 𝗿𝗲𝗾𝘂𝗶𝗿𝗲𝗱

📌 𝗜𝗺𝗽𝗼𝗿𝘁𝗮𝗻𝘁 𝗡𝗼𝘁𝗲:
ASTM bolt grades are 𝗺𝗮𝗿𝗸𝗲𝗱 𝗼𝗻 𝘁𝗵𝗲 𝗯𝗼𝗹𝘁 𝗵𝗲𝗮𝗱, making on-site verification possible.

✅ 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴 𝗧𝗶𝗽:
Always review your 𝘀𝘁𝗿𝘂𝗰𝘁𝘂𝗿𝗮𝗹 𝗽𝗹𝗮𝗻𝘀 𝗮𝗻𝗱 𝗰𝗼𝗻𝗻𝗲𝗰𝘁𝗶𝗼𝗻 𝗱𝗲𝘁𝗮𝗶𝗹𝘀 to confirm the specified bolt type. Using an incorrect bolt grade can compromise structural performance and safety.

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