JDC Titanium Allen Cap Bolts Shop JDC's selection of titanium Allen cap bolts! Available in most common metric diameters (M3, M4, M5, M6, and M8), and a variety of lengths, our titanium dress-up hardware not only replaces, but upgrades old rusty bolts to vibrant JDC Titanium jewelry! Washers can be purchased separately here. Thread Pitches (Unless otherwise noted): M3 - 0.5 M4 - 0.7 M5 - 0.8 M6 - 1.0 M8 - 1.25 M10 - 10.25 For a full list of colors check out our JDC Titanium Color Options. If you want to learn how to keep your titanium clean take a look at JDC Titanium Maintenance and Care.