The 1550MS100BK is a bag of 100 black M3.5 x 12mm assembly screws. Its part page calls it 1550 series replacement screws, black stainless steel, 100-pack, with the short description "SS M3.5 Mach Screw 1X100 BK", and the manufacturer's hardware list assigns it to both the 1550 and 1590 series.

As the black counterpart to 1550MS100, this pack is the match for enclosure builds where a dark fastener is preferred over a bright one. At 100 screws per pack it fits production assembly as well as integrator and repair-bench stock for both enclosure families.

• Quantity: 100 per pack
• Screw: M3.5 x 12mm machine screw, black
• Type: assembly screws
• Applicable series: 1550, 1590

The manufacturer notes that in most cases enclosures include all hardware needed for assembly, which makes this a replacement pack. Hardware packs may not be compatible with all parts in the listed series, so check the series landing page or the "Replacement Parts and Accessories" list on your enclosure's part page.

The 1550MS100BK lists steel as its material, and its part page type is given as "Screws, Tamper Resistant". It ships in a bag at 0.22 lbs (0.10 kg) and is RoHS and REACH compliant. For a sealed fastener on 1590 enclosures, the o-ring version is 1550WMS100BK.