Aurora Bearing Company
Aurora Bearing Company
901 Aucutt Rd.
Montgomery, IL 60538
Phone: 630.859.2030 • Fax: 630.859.0971
Email: customersupport@aurorabearing.com • Website: www.aurorabearing.com
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  • Body - Low carbon steel, protective coated for corrosion resistance. Size 16 standard series body is alloy steel not heat treated.
  • Ball - Alloy steel, heat treated, hard chrome plated.
  • Race - Low carbon steel, protective coated for corrosion resistance.
  • Grease Fitting available for sizes -3 and up. Units are supplied without grease fittings. When a grease fitting is required, specify by adding suffix "Z" or "F". Ex.: MM-6Z = Zerk Type Fitting MM-6F = Flush Type Fitting.
  • Load ratings apply only to rod ends without grease fittings. For load ratings with fittings, please consult our engineering department.
  • Studded configuration available upon request. Specify by adding suffix "S". Ex.: MM-8S.
  • PTFE Liners available upon request. Specify by adding suffix "T". Ex.: MM-8T.
MM & MB Image
MM & MB Dimensional Drawing
Unit of Measure
1 2 3 4 

Item #

Thread Type

B - Ball Bore

W - Ball Width

H - Head Width

A - Base to Center

D - Head Diameter

C - Thread Length

Thread Size

Ultimate Radial Static Load Capacity

MM-2 N/A Right Hand N/A .1250 in N/A .250 in N/A .187 in N/A .937 in N/A .500 in N/A .562 in N/A 6-32 N/A 502 lbs
MB-2 N/A Left Hand N/A .1250 in N/A .250 in N/A .187 in N/A .937 in N/A .500 in N/A .562 in N/A 6-32 N/A 502 lbs
MM-3 N/A Right Hand N/A .1900 in N/A .312 in N/A .250 in N/A 1.250 in N/A .625 in N/A .750 in N/A 10-32 N/A 1,169 lbs
MB-3 N/A Left Hand N/A .1900 in N/A .312 in N/A .250 in N/A 1.250 in N/A .625 in N/A .750 in N/A 10-32 N/A 1,169 lbs
MM-3Z N/A Right Hand N/A .1900 in N/A .312 in N/A .250 in N/A 1.250 in N/A .625 in N/A .750 in N/A 10-32 N/A Consult Engineering Department
MB-3Z N/A Left Hand N/A .1900 in N/A .312 in N/A .250 in N/A 1.250 in N/A .625 in N/A .750 in N/A 10-32 N/A Consult Engineering Department
MM-3F N/A Right Hand N/A .1900 in N/A .312 in N/A .250 in N/A 1.250 in N/A .625 in N/A .750 in N/A 10-32 N/A Consult Engineering Department
MB-3F N/A Left Hand N/A .1900 in N/A .312 in N/A .250 in N/A 1.250 in N/A .625 in N/A .750 in N/A 10-32 N/A Consult Engineering Department
MM-4 N/A Right Hand N/A .2500 in N/A .375 in N/A .281 in N/A 1.562 in N/A .750 in N/A 1.000 in N/A 1/4-28 N/A 2,158 lbs
MB-4 N/A Left Hand N/A .2500 in N/A .375 in N/A .281 in N/A 1.562 in N/A .750 in N/A 1.000 in N/A 1/4-28 N/A 2,158 lbs
MM-4Z N/A Right Hand N/A .2500 in N/A .375 in N/A .281 in N/A 1.562 in N/A .750 in N/A 1.000 in N/A 1/4-28 N/A Consult Engineering Department
MB-4Z N/A Left Hand N/A .2500 in N/A .375 in N/A .281 in N/A 1.562 in N/A .750 in N/A 1.000 in N/A 1/4-28 N/A Consult Engineering Department
MM-4F N/A Right Hand N/A .2500 in N/A .375 in N/A .281 in N/A 1.562 in N/A .750 in N/A 1.000 in N/A 1/4-28 N/A Consult Engineering Department
MB-4F N/A Left Hand N/A .2500 in N/A .375 in N/A .281 in N/A 1.562 in N/A .750 in N/A 1.000 in N/A 1/4-28 N/A Consult Engineering Department
MM-5 N/A Right Hand N/A .3125 in N/A .437 in N/A .344 in N/A 1.875 in N/A .875 in N/A 1.250 in N/A 5/16-24 N/A 2,784 lbs
MB-5 N/A Left Hand N/A .3125 in N/A .437 in N/A .344 in N/A 1.875 in N/A .875 in N/A 1.250 in N/A 5/16-24 N/A 2,784 lbs
MM-5Z N/A Right Hand N/A .3125 in N/A .437 in N/A .344 in N/A 1.875 in N/A .875 in N/A 1.250 in N/A 5/16-24 N/A Consult Engineering Department
MB-5Z N/A Left Hand N/A .3125 in N/A .437 in N/A .344 in N/A 1.875 in N/A .875 in N/A 1.250 in N/A 5/16-24 N/A Consult Engineering Department
MM-5F N/A Right Hand N/A .3125 in N/A .437 in N/A .344 in N/A 1.875 in N/A .875 in N/A 1.250 in N/A 5/16-24 N/A Consult Engineering Department
MB-5F N/A Left Hand N/A .3125 in N/A .437 in N/A .344 in N/A 1.875 in N/A .875 in N/A 1.250 in N/A 5/16-24 N/A Consult Engineering Department
MM-6 N/A Right Hand N/A .3750 in N/A .500 in N/A .406 in N/A 1.938 in N/A 1.000 in N/A 1.250 in N/A 3/8-24 N/A 3,915 lbs
MB-6 N/A Left Hand N/A .3750 in N/A .500 in N/A .406 in N/A 1.938 in N/A 1.000 in N/A 1.250 in N/A 3/8-24 N/A 3,915 lbs
MM-6Z N/A Right Hand N/A .3750 in N/A .500 in N/A .406 in N/A 1.938 in N/A 1.000 in N/A 1.250 in N/A 3/8-24 N/A Consult Engineering Department
MB-6Z N/A Left Hand N/A .3750 in N/A .500 in N/A .406 in N/A 1.938 in N/A 1.000 in N/A 1.250 in N/A 3/8-24 N/A Consult Engineering Department
MM-6F N/A Right Hand N/A .3750 in N/A .500 in N/A .406 in N/A 1.938 in N/A 1.000 in N/A 1.250 in N/A 3/8-24 N/A Consult Engineering Department
Unit of Measure
1 2 3 4