B Series 5/16" x 5/16" Precision Thin Section Bearing

The B Series is a thin section bearing with a bore diameter ranging from 2.000 to 12.00 inches and a cross secton of 5/16 inches.

The B Series bearings are available from stock in three configurations to support various load scenarios : radial contact (Type C), angular contact (Type A), and four-point contact (Type X).

Standard Product Engineering and Manufacturing Data

• ABMA-ABEC-1F Precision or better
• ABMA Standard 26.2 internal geometry
• Ring material
  • 52100 vacuum degassed or spec 6440/6441
  • ASTM A295 AMS 6440/6441
  • AISI 440c
  • 17-4 ph stainless steel
  • M-50
  • Ceramic and other special materials
• Heat treated rings Rc 60-62 hardened and stress relieved
• Balls
  • 52100 grade 24/25 ABMA STD 10
  • Ceramic balls (silicon nitride)
  • 440c stainless steel balls
• Retainers
  • Specification ASTM B-36 brass
  • Nylon, phenolic, steel or special materials
  • TDC, silver TIC, tin or other special platings
• Seals
  • Buna-n stainless steel backed and molded
  • Viton
  • Teflon and others

Technical Specifications

Type A Interchange
Angular Contact

A deep groove bearing with reduced shoulder on one side of inner or outer race ball path. Snapover assembly permits use of a one-piece circular pocket ring separator and greater ball complement. These bearings will accept radial load and single direction thrust load and are normally used in conjunction with another bearing of similar construction. Type A bearings require the application of thrust to establish contact angle. Stock bearings are individual units and when purchased as such must be adjusted at installation to desired running clearance or preload. When required, matched sets are available. McFarland Associates also offers matched spacers for applications requiring extra precision.

B SERIES - 5/16" x 5/16"
Industry Part No	Prime Drives Part No	Dimensions (in)					Capacities(lbs)1				Lbs
		Bore	Outside Dia	Land Dia L1	Land Dia L2	C'Bore Dia L3	Radial		Thrust
							Static2	Dyn	Static2	Dyn
KB020AR0	AB020AR0	2.000	2.625	2.231	2.393	2.464	1,090	480	3,150	1,380	.15
KB025AR0	AB025AR0	2.500	3.125	2.731	2.893	2.964	1,340	550	3,860	1,590	.19
KB030AR0	AB030AR0	3.000	3.625	3.231	3.393	3.462	1,550	610	4,470	1,750	.22
KB035AR0	AB035AR0	3.500	4.125	3.731	3.893	3.962	1,790	670	5,180	1,930	.27
KB040AR0	AB040AR0	4.000	4.625	4.231	4.393	4.460	2,040	730	5,890	2,100	.30
KB042AR0	AB042AR0	4.250	4.875	4.481	4.643	4.710	2,150	750	6,200	2,170	.31
KB045AR0	AB045AR0	4.500	5.125	4.731	4.893	4.960	2,250	780	6,500	2,240	.34
KB047AR0	AB047AR0	4.750	5.375	4.981	5.143	5.210	2,390	810	6,910	2,340	.35
KB050AR0	AB050AR0	5.000	5.625	5.231	5.393	5.460	2,500	830	7,210	2,410	.37
KB055AR0	AB055AR0	5.500	6.125	5.731	5.893	5.958	2,740	890	7,920	2,560	.40
KB060AR0	AB060AR0	6.000	6.625	6.231	6.393	6.458	2,990	940	8,630	2,710	.44
KB065AR0	AB065AR0	6.500	7.125	6.731	6.893	6.958	3,200	980	9,240	2,840	.47
KB070AR0	AB070AR0	7.000	7.625	7.231	7.393	7.456	3,450	1,030	9,960	2,980	.50
KB075AR0	AB075AR0	7.500	8.125	7.731	7.893	7.955	3,700	1,080	10,670	3,120	.54
KB080AR0	AB080AR0	8.000	8.625	8.231	8.393	8.453	3,940	1,130	11,380	3,260	.57
KB090AR0	AB090AR0	9.000	9.625	9.231	9.393	9.451	4,400	1,220	12,700	3,510	.64
KB100AR0	AB100AR0	10.000	10.625	10.231	10.393	10.449	4,890	1,300	14,120	3,760	.71
KB110AR0	AB110AR0	11.000	11.625	11.231	11.393	11.447	5,350	1,380	15,440	4,000	.78
KB120AR0	AB120AR0	12.000	12.625	12.231	12.393	12.445	5,840	1,470	16,860	4,240	.85

¹ Capacities listed are not simultaneous. Dynamic capacities are based upon 1 million revolutions of L10 life.
² Static capacities are non-brinell limits based on rigid support from the shaft and housing.

Type X Interchange
Four-Point Contact

A Conrad assembled bearing designed for applications involving multiple loads. Unique internal geometry permits application of radial load, thrust load in either direction, and moment load, individually or in any combination. A single four-point contact bearing may replace two bearings in many applications.

B SERIES - 5/16" x 5/16"
Industry Part No	McFarland Associates Part No	Dimensions (in)				Capacities1						Lbs
		Bore	Outside Dia	Land Dia L1	Land Dia L2	Radial (lbs)		Thrust (lbs)		Moment (lbs-in)
						Static2	Dyn	Static2	Dyn	Static2	Dyn
KB020XP0	AB020XP0	2.000	2.625	2.231	2.393	930	450	2,340	1,130	1,080	520	.16
KB025XP0	AB025XP0	2.500	3.125	2.731	2.893	1,140	520	2,840	1,290	1,600	730	.19
KB030XP0	AB030XP0	3.000	3.625	3.231	3.393	1,340	580	3,350	1,440	2,220	960	.24
KB035XP0	AB035XP0	3.500	4.125	3.731	3.893	1,540	630	3,860	1,590	2,940	1,210	.27
KB040XP0	AB040XP0	4.000	4.625	4.231	4.393	1,750	690	4,370	1,720	3,770	1,490	.30
KB042XP0	AB042XP0	4.250	4.875	4.481	4.643	1,830	710	4,570	1,780	4,170	1,620	.31
KB045XP0	AB045XP0	4.500	5.125	4.731	4.893	1,950	740	4,880	1,850	4,690	1,780	.33
KB047XP0	AB047XP0	4.750	5.375	4.981	5.143	2,030	760	5,080	1,900	5,140	1,930	.34
KB050XP0	AB050XP0	5.000	5.625	5.231	5.393	2,150	790	5,380	1,980	5,720	2,100	.38
KB055XP0	AB055XP0	5.500	6.125	5.731	5.893	2,360	840	5,890	2,100	6,850	2,440	.41
KB060XP0	AB060XP0	6.000	6.625	6.231	6.393	2,560	890	6,400	2,220	8,080	2,800	.44
KB065XP0	AB065XP0	6.500	7.125	6.731	6.893	2,760	930	6,910	2,340	9,410	3,180	.47
KB070XP0	AB070XP0	7.000	7.625	7.231	7.393	2,970	980	7,420	2,450	10,850	3,580	.50
KB075XP0	AB075XP0	7.500	8.125	7.731	7.893	3,170	1,020	7,920	2,560	12,380	4,000	.53
KB080XP0	AB080XP0	8.000	8.625	8.231	8.393	3,370	1,070	8,430	2,670	14,020	4,440	.57
KB090XP0	AB090XP0	9.000	9.625	9.231	9.393	3,780	1,150	9,450	2,880	17,600	5,360	.66
KB100XP0	AB100XP0	10.000	10.625	10.231	10.393	4,190	1,230	10,460	3,080	21,580	6,360	.73
KB110XP0	AB110XP0	11.000	11.625	11.231	11.393	4,590	1,310	11,480	3,280	25,970	7,420	.75
KB120XP0	AB120XP0	12.000	12.625	12.231	12.393	5,000	1,390	12,500	3,470	30,770	8,550	.83

¹ Capacities listed are not simultaneous. Dynamic capacities are based upon 1 million revolutions of L10 life.
² Static capacities are non-brinell limits based on rigid support from the shaft and housing.

Type C Interchange
Radial Contact

A Conrad assembled bearing designed primarily for application of radial either direction – often used in conjunction with another bearing.

B SERIES - 5/16" x 5/15"
Industry Part No	Prime Drives Part No	Dimensions(in)				Radial Capacity (lbs)1		Lbs
		Bore	Outside Dia	Land Dia L1	Land Dia L2	Static2	Dynamic
KB020CP0	AB020CP0	2.000	2.625	2.231	2.393	930	450	.16
KB025CP0	AB025CP0	2.500	3.125	2.731	2.893	1,140	520	.20
KB030CP0	AB030CP0	3.000	3.625	3.231	3.393	1,340	580	.24
KB035CP0	AB035CP0	3.500	4.125	3.731	3.893	1,540	630	.27
KB040CP0	AB040CP0	4.000	4.625	4.231	4.393	1,750	690	.30
KB042CP0	AB042CP0	4.250	4.875	4.481	4.643	1,830	710	.31
KB045CP0	AB045CP0	4.500	5.125	4.731	4.893	1,950	740	.33
KB047CP0	AB047CP0	4.750	5.375	4.981	5.143	2,030	760	.34
KB050CP0	AB050CP0	5.000	5.625	5.231	5.393	2,150	790	.38
KB055CP0	AB055CP0	5.500	6.125	5.731	5.893	2,360	840	.41
KB060CP0	AB060CP0	6.000	6.625	6.231	6.393	2,560	890	.44
KB065CP0	AB065CP0	6.500	7.125	6.731	6.893	2,760	930	.47
KB070CP0	AB070CP0	7.000	7.625	7.231	7.393	2,970	980	.50
KB075CP0	AB075CP0	7.500	8.125	7.731	7.893	3,170	1,020	.53
KB080CP0	AB080CP0	8.000	8.625	8.231	8.393	3,370	1,070	.57
KB090CP0	AB090CP0	9.000	9.625	9.231	9.393	3,780	1,150	.66
KB100CP0	AB100CP0	10.000	10.625	10.231	10.393	4,190	1,230	.73
KB110CP0	AB110CP0	11.000	11.625	11.231	11.393	4,590	1,310	.75
KB120CP0	AB120CP0	12.000	12.625	12.231	12.393	5,000	1,390	.83

¹ Capacities listed are not simultaneous. Dynamic capacities are based upon 1 million revolutions of L10 life.
² Static capacities are non-brinell limits based on rigid support from the shaft and housing.