All Categories > Standard Tread Nosings Grating    Standard Tread Nosings Grating Click on a Product to view details. Checkered Nosing Available in Steel. General Notes: Nosings shall be used on treads and on grating at the head of stairs, both for visual safety and to sustain edge loads. Nosing widths shall be between 1 1/4 in. and 1 1/2 in. (Manufacturers’ standards are within these limits.) Abrasive Nosing Available in cast iron, cast aluminum and furnished with manufact-urer’s standard finish unless specified otherwise by buyer; cast aluminum is recommended for galva nized, aluminum or stainless steel treads as cast iron might show rusting when exposed to the elements. General Notes: Mechanically fastened nosings shall be used on treads and on grating at the head of stairs, both for visual safety and to sustain edge loads. Nosing widths shall be between 1 1/4 in. and 1 1/2 in. (Manufacturers’ standards are within these limits.) Grooved Nosing Available in aluminum only. General Notes: Nosings shall be used on treads and on grating at the head of stairs, both for visual safety and to sustain edge loads. Nosing widths shall be between 1 1/4 in. and 1 1/2 in. (Manufacturers’ standards are within these limits.)