Information on A/D/G Coatings for Bolts, Spacers, and Washers {7000, 7553, 7553} Caterpillar


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Information on A/D/G Coatings for Bolts, Spacers, and Washers {7000, 7553, 7553} [M0066912]
FRAME AND BODY
Information on A/D/G Coatings for Bolts, Spacers, and Washers {7000, 7553, 7553}
Excavator
All
Service Magazine, M0066912, 14, January 2016, "Coated Bolts are Available for All Cat Products {7000, 7553, 7553}" . Disregard the previous article. The following article has been updated.

The purpose of this publication is to inform how to identify the fastener specification in the field. AVSpare designed bolts, spacers, and washers must be used in the appropriate locations and tightened properly. For bolts, anti-seize compound may be required to achieve proper torque. Improper torque may result in bolt loosening. The information in Table 1 shows the specifications for three of the most common types of coated bolts, spacers, and washers.

Ensure that the correct bolts, spacers, and washers are used for the correct application. Refer to SIS for the correct fasteners for each application.

Table 1
Coated Fasteners  Coating Description  Min Thickness (µm)  ASTM B117 OR ISO 9227 Salt Spray Resistance  In Service Temperature Range (°C) Reference  Coated Color 
A Coated  Zinc Phosphate + Oil  N/A  72 h to Red  -50 to 330  Dark Gray 
D Coated  Electroplated Zinc + (Trivalent Cr or Cr Free + Top Sealer  96 h to White  -50 to 170  Silver (clear or blue-bright iridescent finished) 
G Coated  Zinc Flake Coating  720 h to Red  -50 to 220  Matte Light Gray or Black (the topcoat may contain dyes to modify color) 


Illustration 1g06054758
(A) A coated bolts
(D) D coated bolts
(G) G coated bolts

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