L S Starrett BEARING COMPANY

Keystock Bearings

Keystock are removable bars that are used to transmit torque from components including couplings, sheaves, sprockets and gears to a shaft. They are called “keys” because they lock a component to the shaft by means of a corresponding keyway in a shaft. Keystock is available in both inch and metric sizes. Common keystock materials include steel, stainless steel and plated with zinc and are supplied in standard lengths of 12” long. Keystock can be rounded at both ends, squared at both ends, or rounded at one end and squared at the other.

There are many different types of keystock available including machine keys, Woodruff keys, hi-pro keys, gib head keys, and hex keys. Machined keystock is available in standard sizes and ready to use without additional cutting or filing. Woodruff keys are semi-circular components (half moon) installed deep in a shaft and firmly embedded. Hi-pro keys are similar to Woodruff keys, but lock into place. They provide superior strength and vibration resistance. Gib head keys are notched and tapered to tightly couple gears or pulleys with a shaft. Hex keys are L-shaped bars with a hexagonal head. They are used to turn screws with hexagonal sockets. The following chart details standardized keyways and setscrews utilized for inch sized shafts:

Precision Brand 54575 Keystock Bearings
10300 RPM
Not for Ball Screws
Precision Brand 4065 Keystock Bearings
7.5000 in
49900 lbs
Precision Brand 5095 Keystock Bearings
Deep Groove Ball Bea
10
Precision Brand 4060 Keystock Bearings
30.7 kN
Zinc Plated
Precision Brand 56507 Keystock Bearings
9.4488 in
Steel
Precision Brand 4050 Keystock Bearings
Single
6
Precision Brand 4242 Keystock Bearings
053893771434
Without Snap Ring
Precision Brand 14675 Keystock Bearings
Set Screw
Cast Iron - Nickel P
Precision Brand 54624 Keystock Bearings
2.9531 in
Standard Precision
Precision Brand 15801 Keystock Bearings
40 mm
PBT Thermoplastic
Precision Brand 54574 Keystock Bearings
Mounted Units & Inserts
0.0
Precision Brand 54299 Keystock Bearings
-65 to +392 &de
48 mm
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