Product Description
Webb 66864B 16.5 x 7 Balanced Heavy-Duty Outboard Brake Drum – 3600AX / 89996B
The Webb 66864B is a 16.5 x 7-inch balanced cast-iron brake drum with an outboard mounting configuration. It features an 8.78-inch pilot diameter, 11.25-inch bolt circle, and 10-hole mounting pattern.
Gunite 3600AX is a confirmed interchange for the balanced 66864B. Stemco/Motor Wheel 89996B is another recognized interchange. The B suffix is important on this drum because Webb uses it to identify the balanced version; 66864F is the standard finished, unbalanced version.
Part Number: 66864B
Product Type: Heavy-Duty Brake Drum
Brand: Webb
Brake Size: 16.5 x 7 in.
Brake Surface Diameter: 16.50 in.
Brake Surface Flat: 7.54 in.
Overall Depth: 10.52 in.
Mounting Type: Outboard
Drum Type: K
Material: Cast Iron
Balance: Balanced
Pilot Diameter: 8.78 in.
Bolt Circle Diameter: 11.25 in.
Bolt Holes: 10
Bolt Hole Diameter: 1.00 in.
Back Plate Thickness: 0.48 in.
Maximum Wear Diameter: 16.62 in.
Approximate Weight: 108–112 lb
Gunite Cross Reference: 3600AX
Stemco / Motor Wheel Cross Reference: 89996B
Meritor Cross Reference: 85-123207-002
Additional Cross References: 3600A, 3922X, 16792X, 600004HD, 13-00043, 66864B20
Inventory Description: 3600AX CASTIRON EKU8752B 89996
Before ordering, confirm the 66864B number or a verified interchange, along with the 16.5 x 7 brake size, 8.78-inch pilot, 11.25-inch bolt circle, 10-hole pattern, and outboard mounting configuration to ensure proper fit.
