The NAAMS Series of wear plate fully meets the North 
American Automotive Standard. They are 20mm thick and 
available in plain steel, steel with graphite plugs and aluminumbronze with graphite plugs. The aluminum-bronze and steel 
with graphite plugs are self-lubricating products and do not 
require lubrication during production. All NAAMS wear plates are 
supplied with mounting holes to accommodate M12 S.H.C.S. 
For ease of identifi cation, all products are marked with the part 
number.  

MATERIALS:
 Steel wear plates are manufactured 
from high quality carburized steel.
They are precision ground and 
hardened to Rc 56-60 (1.2 mm to 
1.5 mm deep). They are available 
with or without graphite plugs.
 Bronze wear plates are manufactured 
from aluminum bronze material with 
oil impregnated graphite plugs. 
 When ordered with graphite plugs, 
the plugs cover 25-30% of the wear 
surface and are arranged to generate 
optimal coverage at any engagement 
direction of the wear plate.
TOLERANCES:
 Thickness ± 0.025 mm
 Mounting hole 
locations ± 0.25 mm
 Flatness ± 0.012 mm
 Unless otherwise 
noted ± 0.25 mm
MOUNTING SCREWS:
 M12 S.H.C.S. recommended. Plate 
has 13.5mm through hole with 
20mm counterbore 13mm deep.