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Lovejoy/Sier-Bath Gear Coupling, Mill Motor FMM Type, Flanged Sleeve Coupling Flex Hub

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Product Specifications
Flange Type
Material Type
Carbon Steel
Brand Name
System of Measurement

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Coupling Size Bore A Diameter Maximum Rotational Speed ASIN

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Currently showing 1-10 of 10
FMM 1   9000 rpm B004QWZXQE yes $195.00 Buy Options
FMM 1.5 1.5" 8250 rpm B004QWZZDK yes $78.62 Buy Options
FMM 1.5   8250 rpm B004QWZXQY yes $248.00 Buy Options
FMM 1.5 1.5" 8250 rpm B004QWZZDA yes $238.79 Buy Options
FMM 2 2" 7500 rpm B004QWZZA8 yes $329.44 Buy Options
FMM 2 2" 7500 rpm B004QWZZAS yes $440.00 Buy Options
FMM 2   7500 rpm B004QWZXRI yes $315.00 Buy Options
FMM 2 2" 7500 rpm B004QWZZAI yes $329.44 Buy Options
FMM 2.5   6600 rpm B004QWZXSM yes $375.00 Buy Options
FMM 3   6000 rpm B004QWZXT6 yes $450.00 Buy Options

Key Features

  • For use with Sier-Bath FMM type flanged sleeve mill motor gear coupling assembly (not included)
  • AISI 1045 steel for strength and durability
  • Accommodates AISE Mill Motor frame sizes
  • Allows for angular misalignment of up to 1.5 degrees per hub
  • Fully crowned teeth for larger contact area and lower stress under misaligned conditions

Product Description

This Lovejoy FMM Type flex hub is made of steel and is intended for use as a component of a Sier-Bath flanged sleeve gear coupling (not included). This hub is specifically designed for mill motors with tapered bores and is made of American Iron and Steel Institute (AISI) 1045 steel for strength and durability. The hub teeth are fully crowned for larger contact area with the sleeve teeth and lower stress under misaligned conditions, which allows for angular misalignment of up to 1.5 degrees per hub. The hub also accommodates parallel and axial misalignment of the attached shafts. Gear couplings, a type of flexible coupling, use gear teeth on hubs and sleeves to transmit torque and offset rotational misalignment, and are suitable for use in applications involving extended distances between shaft ends, such as metal rolling mills and paper mills.

Flexible couplings are used to link two rotating shafts that are not aligned in order to transmit the rotational power, known as torque, from one shaft to the other. Most flexible couplings consist of two hubs and a middle assembly; each hub attaches to a shaft while the middle assembly flexes between the hubs to accommodate the misalignment of the two shafts. Shaft misalignments are generally either parallel or angular and cause complications to transmitting rotational power from one shaft to another in the form of stresses, loads, vibrations, and other forces, which vary from one type of misalignment to another. Flexible couplings are used in a broad range of applications, such as in motor vehicles, conveyors, escalators, agricultural, forestry and mining equipment, aeronautics, robotics and space exploration, among others.

Lovejoy manufactures flexible couplings, universal joints, variable speed drives, and other transmission and mechanical power products. The company, founded in 1900, is headquartered in Downers Grove, IL.

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