BSW 3/8 1/4 Knurled Thumb Screws Aluminum Double End Thread Hand Grip Knob Bolts

Double end thread means the screw has exposed BSW threads on both ends of the shaft, rather than a threaded shank on one end only. This allows the fastener to engage a nut or threaded insert from either side, which is useful in through-panel assemblies or when you need to stack components on both ends of the same fastener.

BSW stands for British Standard Whitworth, a thread form with a 55° thread angle. It is not interchangeable with metric (60° angle) or UNC/UNF threads. Before ordering, confirm that your mating nuts, threaded inserts, or tapped holes are also BSW specification. Mixing thread standards will result in cross-threading or failure to engage.

Choose based on the thread size of your mating hardware. The 1/4" BSW thread is suited for lighter-duty panel retention and thinner material applications, while the 3/8" BSW thread provides greater clamping force and is better for heavier panels or structural connections. The "Thread" option on this listing shows both the grip-end and stud-end diameters (e.g., 3/8"×1/4" means 3/8" on one end, 1/4" on the other).

Aluminum thumb screws are designed for hand-tightened, low-vibration applications such as PC case panels, enclosure lids, and access covers. For environments with significant vibration (e.g., motor mounts or vehicle-mounted equipment), consider adding a nylon insert nut or thread-locking compound on the mating side to maintain engagement. They are not intended as structural load-bearing fasteners.

Anodizing creates an oxide layer on the aluminum surface that improves corrosion resistance compared to bare aluminum. All three finish options — Black, Red, and Silver — provide this protective layer. For indoor builds and electronics enclosures, the anodized finish is sufficient. For outdoor or high-humidity environments, additional protective measures may be advisable.

Order 1 pcs if you want to verify fit and thread engagement before committing to a full build. Choose 5 pcs for a typical panel or enclosure project with a few access points. The 10 pcs pack offers the best per-unit value and is recommended for full rack builds, multi-panel enclosures, or if you want spares on hand for future projects.

Yes. The knurled thumb screw format is a common choice for PC case side panels, tempered glass retention brackets, and removable drive bay covers. The hand-tightenable grip means you can open and reseat panels repeatedly without tools. Confirm that your case's threaded standoffs or panel holes match the BSW thread specification before purchasing.