FAG H312

FAG H312 Adapter Sleeve for 55mm Shafts

Description

The FAG H312 is a high-precision adapter sleeve designed for securely mounting rolling bearings with a tapered bore onto cylindrical shafts. As a component from FAG, a leading brand of the Schaeffler Group, it guarantees quality and reliability. This sleeve simplifies the mounting process, allows for wider shaft tolerances, and ensures accurate bearing positioning, making it an essential part for many industrial powertrain and machinery applications.

Specifications

• Manufacturer: FAG
• Part Number: H312
• Type: Adapter Sleeve
• Shaft Diameter (d1): 55 mm
• Corresponding Bearing Bore Diameter: 60 mm
• Outer Diameter (D): 80 mm
• Overall Width (B1): 50 mm
• Material: Steel
• Required Accessories: Lock Nut KM12, Lock Washer MB12

Label Info

• Model: H312
• EAN: 4012801217026
• Internal Code: 06021300

Application

Adapter sleeves like the H312 are widely used in agricultural machinery, conveyor systems, industrial fans, pumps, and general mechanical engineering. They are ideal for applications where bearings need to be mounted on smooth or stepped shafts without requiring complex machining for a bearing seat.

CO2 Impact

Choosing this reused FAG adapter sleeve prevents the emission of approximately 1.16 kg of CO2 compared to manufacturing a new one. This saving is equivalent to the carbon captured by a tree in over 2 months.

Availability

This item is in stock and ready for immediate dispatch. It is a new-in-box (NIB) product, where the original packaging has been opened for verification and photography. Order now from spareparts2day for expert support and fast delivery.

FAQ

What bearing series can be used with the H312 adapter sleeve?
The H312 is designed for bearings with a tapered bore and a 60 mm inner diameter, for mounting on a 55 mm shaft. This includes bearing series such as 1312, 2312, 22312, and spherical roller bearings like 23012.

What accessories are required to properly install an H312 sleeve?
To correctly install and secure an H312 adapter sleeve, you need a corresponding lock nut, typically an KM12 (or HM 3012), and a lock washer, usually an MB12. These components prevent the bearing from loosening during operation.

What is the correct procedure for tightening the lock nut on an H312 sleeve?
The lock nut should be tightened to remove the internal clearance in the bearing. The correct method involves using a hook spanner and monitoring the reduction in radial internal clearance. The final position is achieved when the specified clearance reduction is met, after which the lock washer tab is bent into a slot on the nut to secure it. Refer to the FAG mounting instructions for precise values.

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Last Update: Friday, March 13, 2026