Keys & Keystock
Square, rectangular, Woodruff keys and keystock bar.
Also searched as: woodruff keysquare keymachine keykeystockparallel key
-
Woodruff Key, 1/4 x 1 in Key Size, 141 SAE Number
Key Shape: WoodruffKey Size: 1/4 x 1 inchSAE Number: 141System of Measurement: InchTensile Strength: 72000 psi
from $14.99Zoro $14.99 -
Woodruff Key, 1/4 x 1-1/8 in Key Size, 18 SAE Number
Height: 0.469 inKey Size: 1/4 x 1-1/8 inLength: 1.125 inLength Tolerance: +0.000 to -0.010Rockwell Hardness: B90
from $18.39Zoro $18.39 -
Woodruff Key, 1/4 x 3/4 in Key Size, 91 SAE Number
Key Size: 1/4 x 3/4 inSAE Number: 91Strength: 72000 psi
-
Woodruff Key, 1/4 x 7/8 in Key Size, A SAE Number
Key Size: 1/4 x 7/8 inSAE Number: A
from $13.49Zoro $13.49 -
Woodruff Key, 1/4 x 7/8 in Key Size, A SAE Number, 0.0625 in H
Height: 0.0625 inKey Size: 1/4 x 7/8 inMaterial Grade/Class: Grade 1018/Grade 1045SAE Number: A
-
Woodruff Key, 1/8 x 1/2 in Key Size
Height: 0.194 inKey Size: 1/8 x 1/2 in
from $14.40Zoro $14.40 -
Woodruff Key, 3 x 3.7 mm Key Size
Key Size: 3 x 3.7 mm
-
Woodruff Key, 3 x 5 mm Key Size
Key Size: 3 x 5 mm
from $12.50Zoro $12.50 -
Woodruff Key, 3/16 x 3/4 in Key Size, 9 SAE Number
Height: 0.0625 inKey Size: 3/16 x 3/4 inLength: 0.735 inLength Tolerance: 0.730 to 0.740 inRockwell Hardness: B90
from $30.39Zoro $30.39 -
Woodruff Key, 3/16 x 5/8 in Key Size, 61 SAE Number
Height: 0.234 inKey Size: 3/16 x 5/8 inSAE Number: 61
from $18.59Zoro $18.59 -
Woodruff Key, 3/16x5/8 in, SAE 61
Height: 0.2340 inKey Size: 3/16 x 5/8 inLength: 0.625 inSAE Number: 61
-
Woodruff Key, 3/32 x 1/2 in Key Size
Height: 0.194 inKey Size: 3/32 x 1/2 in
from $64.50Zoro $64.50 -
Woodruff Keys
Size: M2-M10
-
Woodruff Keys
Height: 6.5 mmQuantity: 25 piecesWidth: 4 mm
About keys & keystock
Keys and keystock are essential mechanical components used to prevent relative rotation between a shaft and a rotating machine element such as a gear, pulley, or coupling. They transmit torque by fitting into keyways machined into both the shaft and the hub. The primary types include square keys, rectangular keys, and Woodruff keys. Square and rectangular keys are typically parallel keys, often specified by their width, height, and length, conforming to standards such as ASME B17.1 or DIN 6885. Woodruff keys are semicircular in shape, designed to seat in a semicircular keyway in the shaft, which can reduce stress concentrations and provide easier assembly; they are specified by their nominal width and diameter, often per ASME B17.2. Keystock refers to bar material, typically supplied in standard lengths, from which custom keys can be cut. Common materials for keys and keystock include low-carbon steel (e.g., 1018, 1045) for general applications, stainless steel (e.g., 303, 304, 316) for corrosion resistance, and alloy steels for higher strength requirements. Finishes are typically plain, although some may be offered with a black oxide coating for minor corrosion protection or improved appearance.
How to choose
Selecting the correct key involves a sequence of decisions. First, determine the required torque transmission capacity to establish the necessary key dimensions (width, height, length) and material. Second, consider the shaft and hub keyway geometry; this dictates whether a square, rectangular, or Woodruff key is appropriate. Woodruff keys are often preferred for tapered shafts or lighter duty applications where alignment is critical. Third, verify the available space and keyway dimensions on both the shaft and the mating component. Finally, choose the material based on environmental conditions and strength requirements, with carbon steel being standard, and stainless steel for corrosive environments.