Products & Services

Protocase manufactures fully finished custom electronic enclosures and associated parts from a wide variety of materials and components, in 2-3 days with no minimum order. Protocase also provides expert and affordable enclosure design services.

Materials, Components & Finishes

Conventional Fasteners

Protocase stocks a wide variety of conventional fasteners, and if we don't stock it, we have access to just about any common fastener on a quick-delivery. The most commonly used items are machine screws and hex nuts, which are listed in the table below.

Self-tapping screws vs. machine screw / self-clinching nut combination

In certain situations, a designer has the option of using either

  1. a combination of self clinching nut and machine screw, or
  2. a self-tapping screw, as shown in the diagram.

We highly recommend option (A), for the following reasons:

  • Self tapping screws are subject to stripping
  • They interfere with finishes, breaking through powdercoating, and creating potential corrosion problems.
  • Inconsistent removal torque --- they can lock in place, and be extremely difficult to remove.

The self tapping screw option is slightly less expensive, but the disadvantages far outweigh the slight savings for most applications. Thus the only place we would ever recommend Option (B) is when searching for cost-engineering solutions on volume orders.

Most Commonly Used Fasteners

Thread Size length Style Finish
2-56 phillips pan head zinc, black oxide, stainless
2-56 phillips flat head (82 & 100) zinc, black oxide, stainless
2-56 - hex nut zinc, stainless
4-40 , 3/8 phillips pan head zinc, black oxide, stainless
4-40 phillips flat head (82 & 100) zinc, black oxide, stainless
4-40 - hex nut zinc, stainless
6-32 , 3/8 phillips pan head zinc, black oxide, stainless
6-32 , 3/8 phillips flat head (82 & 100) zinc, black oxide, stainless
6-32 - hex nut zinc, black oxide, stainless
8-32 3/8 phillips pan head zinc, black oxide, stainless
8-32 3/8 phillips flat head (82) zinc, black oxide, stainless
8-32 - hex nut zinc, black oxide, stainless
10-24 3/8 phillips pan head zinc
10-24 3/8 phillips flat head (82) zinc
10-24 - hex nut zinc
10-32 3/8 phillips pan head zinc, stainless
10-32 3/8 phillips flat head (82) zinc, stainless
10-32 - hex nut zinc, stainless
M3 6mm phillips pan head black oxide, stainless
M3 6mm phillips flat head (90) stainless
M3 - hex nut zinc, stainless
M4 6mm phillips pan head black oxide, stainless
M4 6mm phillips flat head (90) stainless
M4 - hex nut zinc, stainless
M5 10mm phillips pan head zinc
M5 10mm phillips flat head (90) Stainless
M5 - hex nut zinc

The fasteners we use to assemble the enclosures are Machine Screws. We have a variety of sizes and finishes available - pdf.