#4-40 × 3/8" براغي ذات غطاء مقبس أحمر رقعة | محرك سداسي | ستانلس ستيل 18/8 (200 / عبوة)

For a delicate jig I rebuilt, these little stainless steel screws threaded perfectly without any binding, and the red nylon patch held them tight after final adjustment. It’s a relief to have a full pack of exactly the right length on hand for small precision work.

I’ve been using these #4-40 x 3/8" socket cap screws for a small jig I’m building, and the red nylon patch lock really holds tight without any extra thread locker. The hex socket drive makes them easy to install in tight spaces, and the stainless steel feels solid for precision work.

I needed a small batch for a 3D-printed fixture and these fit perfectly, though the red patch holds a bit tighter than I expected. The hex socket drive worked fine with my Allen key, and the stainless finish looks clean.