When you're shopping in fasteners springs industrial hardware, the same $10 can buy two very different things: a used lot of machine screws for restoration work or a fresh pack of rivet nuts for metal assembly. The price gap is only $0.40, so the real decision comes down to whether you need external threads for a visible fastener or internal threads for metal assembly.
Quick Verdict
If your job is a vintage restoration or machinery repair where a weathered, characterful profile matters, the screw lot is the one to buy. If you're assembling metal sheets, building brackets, or doing manufacturing work that needs a reliable internal thread, the rivet nut pack is the more practical choice.
At a Glance
| Product | Listed Price | Condition | Pack Count | Key Details | Best For |
|---|---|---|---|---|---|
| M6 x 65mm Round Head Machine Screws Bolt Lot - 2-5/8\" Long Industrial Fasteners | USD 9.99 | Used | 20 | Slotted drive, round head, stainless steel | Vintage restoration, machinery repair |
| Industrial Grade 100 Pcs Rivet Nuts 1/4\"-20 UNC - Secure and Reliable Fasteners | USD 10.39 | New | 100 | Spline drive, yellow zinc, insert type | Sheet metal assembly, manufacturing |
Where Each Product Wins
- The machine screw lot wins for projects where the head profile and patina are part of the finished look. The 2-5/8\" length gives it a useful reach for restoration or light repair work.
- The rivet nut pack wins for work that needs a large number of new, uniformly finished fasteners with an internal thread. The insert design is suited to metal sheets and similar assemblies.
Product Notes
M6 x 65mm Round Head Machine Screw Lot
This lot brings a classic slotted round-head profile with a naturally weathered patina, which makes it a good match for vintage restoration and creative workshop projects. The stainless steel material and Grade 2 rating offer a straightforward general-purpose choice, and the 2-5/8\" length gives you enough reach for multi-layer assemblies. Because these are used parts, expect variation in finish and appearance from piece to piece, so the lot suits projects where authentic character outweighs perfect consistency. The quantity is also on the smaller side, so you'll want to count your needs before placing an order. This is a specialty salvage-type purchase for someone who values the look and the thread size over a uniform new-bolt appearance.
Rivet Nut Pack, 1/4\"-20 UNC
The rivet nut pack is a new 100-piece set of yellow zinc inserts with a spline drive and knurled body. That combination gives you a stable internal thread for attaching parts to metal sheets, pipes, and manufacturing subassemblies. The 1/4\"-20 UNC thread size works with inch-based hardware, and the insert design makes it useful when you need a strong threaded point in metal. The new condition provides consistent finish and dimensions across all pieces, which helps when you're wiring up a batch of assemblies. The limitation is that these are inserts rather than external-thread screws, so they won't serve the same purpose as a machine screw in a restoration. The yellow zinc color also won't match an aged patina, so keep the project finish in mind.
Final Choice by Use Case
Pick the machine screw lot when your project calls for external threads and a worn character. Pick the rivet nut pack when you need a large supply of new internal threads for metal assemblies. If you're still torn, think about what the fastener has to do: hold a visible vintage look, or create a clean mounting point in sheet metal.
