BLACK ACE® IDLEMASTER® APPLICATIONS:

  • Roller chains
  • Locations on the drive system:
    • Surging loads
    • Load-bearing locations
    • Spring-loaded tensioners
    • Replacement of any idler sprocket
    • Chain wrap of 25 degrees or more
    • Large roller chain pitches which require larger diameters

Part Number
Ansi Chain Size
Diameter
Total Width
Standoff Length
Through Hole
Bearing

2662BDE2X
2662BDE1X 60-2 3.236 1.865 .511/.560 1/2" (2) BGA
2662BDE2X 60-2 3.236 1.865 .511/.560 5/8" (2) BGA
2662BDE3X 60-2 3.236 1.865 .511/.560 3/4" (2) BGA

28100-2B3XN
28100-2B3X 100 4.950 1.625 .105/.130 3/4" (2) BGA

28100B3X
28100B3X 100 3.513 1.625 0.04 3/4" (2) BGA

28120B3X
28120B3X 120 4.950 1.625 .130/.105 3/4" (2) BGA

2856BE3
2856BE1X 50 or 60 3.450 1.550 0.04 1/2" (1) BGA
2856BE2X 50 or 60 3.450 1.550 0.04 5/8" (1) BGA
2856BE3X 50 or 60 3.450 1.550 0.04 3/4" (1) BGA

28684B2X
28684B2X 60 OR 80 3.950 1.750 .04/.068 5/8" (2) BGA
2868B3X 2868B2X 60 or 80 3.236 1.625 .09/.126 5/8" (2) BGA
2868B3X 60 or 80 3.236 1.625 .09/.126 3/4" (2) BGA
2868BD2X 60 or 80 3.236 1.625 .126/.358 5/8" (2) BGA
2868BD3X 60 or 80 3.236 1.625 .126/.358 3/4" (2) BGA
2868BDE2X 60 or 80 3.236 1.625 .293/.358 5/8" (2) BGA
2868BDE3X 60 or 80 3.236 1.625 .293/.358 3/4" (2) BGA
2868F4B3X 2868F4B3X 60 or 80 3.950 1.750 .068/.040 3/4" (2) BGA
2868F4BD2X 60 or 80 3.950 1.750 .336/.040 5/8" (2) BGA
2868FB3X 2868FB2X 60 or 80 3.450 1.750 .04/.068 5/8" (2) BGA
2868FB3X 60 or 80 3.450 1.750 .04/.068 3/4" (2) BGA
2868FBD2X 60 or 80 3.450 1.750 .04/.336 5/8" (2) BGA
2868FBD3X 60 or 80 3.450 1.750 .04/.336 3/4" (2) BGA
2868FBDE3X 60 or 80 3.450 1.750 .230/.336 3/4" (2) BGA

2882TBD3X
2882TBD3X 80-2 3.236 2.375 0.0/-.272 3/4" (2) BGA

2885B3
2885B3 80 8.450 1.250 0.015/-.005 3/4" (2) BGA

W56851ASSY
W56851SASSY 80 8.450 1.250 N/A 1-7/16" (1) BGLH


BEARING INFORMATION

BGA – A 52MM (6205) Bearing used in high-speed applications

BGAS – A 52MM (6205) Bearing used in low to moderate speed applications where high contamination is present

BGF – A 52MM Collar locking bearing used in low to moderate speed applications where moderate contamination is present (used only for 1" shaft mounts)

BGBS – A 40MM (6203) Bearing used in low to moderate speed applications where high contamination is present

BGB – A 40MM (6203) Bearing used in high-speed applications

NB21 – A Fixed Bearing used in underwater applications

AUXILIARY SEAL INFORMATION

NRT – An auxiliary bearing seal that provides excellent protection in high contamination areas to greatly improve bearing life. The NRT seal has a low friction coefficient, providing low bearing drag.