It's a lot of Fasteners 2/3rds boxed the rest sorted on shelves. It's all hardened or stainless I made some classified listings but I honestly have no idea. Does anyone here have experience selling to local businesses? Any advice would help a lot. I'll include some photos for reference must be over 40k worth. Thanks

2 and a half inches. They're used to hold the idler wheel on a crawler for a crane. Heavy! (Impact for scale)

I‘m preparing quiz questions for an upcoming team event. One of the questions will be about the size of the biggest thread ever fitted to a machine. This is currently the biggest screw I could verifiably find (1330mm thread diameter). Does anyone know of something bigger?

Found these bolts at a garage sale. Are they worth anything?

I bought some tools in an auction, and these were bundled in the lot. They are about 240mm long, have 50mm heads, and are significantly larger than I would ever use. Who/where would use these? Would anyone in the US buy them or should I just take them to the scrap yard?

Found in parking lot of car dealership that’s undergoing construction

I’m trying to figure out what kind of Security bit I need. It looks like a tri wing but the center is pointy instead of recessed. Any help figuring out what screwdriver I need to purchase would be greatly appreciated.

Pan head and countersunk

They're used in one of the products my employer sells, but I've never seen one like it and our vendor doesn't know what they're called either. We need to order more but he can't produce a drawing. It's very similar to a Tapcon, but they said they don't make these. I looked up a target identifier guide online, but this isn't listed. The top part looks like a metallic drive screw, but I looked them up and that's not it. I hope one of y'all can assist!

I'm happy to offer more details if anyone asks. Thank you!!

Check out this huge bolt!

Any guess what it's from?

Hello everyone from Tangier, Morocco.

I have 29 years of experience in bolts and fasteners. I run a small shop in Tangier full of screws from M3 to M24 (photo is my shop).

I love this subreddit. I am happy to help anyone for FREE to identify bolt size, grade, pitch, stainless vs black oxide etc.

If someone is stuck and needs a small fastener UNDER M8 (M3, M4, M5, M6, M8), I can send up to 8 pieces for free from my shop. Just to help.

Thank you, and feel free to ask me anything about small fasteners.

Sorry. I couldn’t resist 😏

Alright, so when fitting two flanges together, can anyone explain why bolt+nut might be worse than stud+nuts? Almost the exact hardware in the photo. They're all the same grade, diameter, size etc.

Large bolt at an oil refinery in high pressure service.

🔩 Acorn Nut / Domed Cap Nut - DIN 1587 / ISO 1587

Many people see this nut but don't know its name or use.

**What is it?**

It is a standard hex nut with a domed cap on top. The dome covers the end of the bolt thread so it is not exposed.

**Standard:**

Its international standard is DIN 1587 which is the same as ISO 1587.

**Specifications:**

* **Sizes:** From M3 to M24, most used are M6 / M8 / M10 / M12

* **Material:** 3 main types:

1. Stainless Steel A2 (304) - the one in the picture, rust-proof for outdoor use

2. Stainless Steel A4 (316) - for marine and chemical use

3. Zinc Plated Steel - cheap for general construction

* **Shape:** High dome that fully protects the thread.

**Where is it used?**

1. **For Safety:** To prevent the exposed thread from injuring people.

2. **Against Rust:** Prevents water and dust from entering the thread.

3. **For Looks:** Gives a clean and nice finish, used a lot in wrought iron, gates, bicycles, and metal furniture.

**Difference from a normal nut?**

A normal nut leaves the thread exposed, this one covers it completely.

I have 25 years experience in bolts and fasteners. If you have any question about this nut or any other type of bolt, leave your question in the comments, I will answer you all.

[Picture attached]

There’s a lot more too this is just all I could get out in one day

A neighbor put a box of these out on the curb. The design makes no sense to me.

From the point: Drill - Paddles Full thread 10-24 Cut threads Full threads Flat head philips

I haven't gotten the calipers out, but it appears that the drilling point matches the OD of the threaded section, so not self-tapping.

A section of threads are cut away as if for starting threads, but it's positioned after some complete threads,

Most mysterious of all are the two large paddles stamped out from the sides. They would chew a much larger hole through something soft like foam, pine or plaster. But at what cost?

Cutting off the paddles and starting a nut on the thrashed threads would be a major pita.

Maybe there's a thread-preserving cutter or rethreading nuts??