Crown Mast Shim Flat Washer 0.030 Inch Thickness – HW-1161

This flat washer is a Crown manufactured mast shim measuring 0.030 inch thick, used to fine-tune clearance and alignment inside a mast assembly rather than serving as a general-purpose fastener washer. Mast shims of this type are stacked or swapped to dial in rail spacing and reduce play as components wear, which directly affects how smoothly the mast rides and how tight the fit stays between mast channels.

It fits a wide range of equipment beyond Crown, including Toyota, Hyster, Yale, Caterpillar, Clark, Komatsu, Mitsubishi, and Nissan lift trucks, reflecting how standardized this shim thickness is across the industry. At roughly a tenth of a pound, it is a small steel component, but one where the exact thickness matters: using the wrong shim thickness during a mast rebuild can leave excess play or introduce binding, so matching the 0.030 inch specification is what makes the adjustment work as intended.