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Slewing Ring Pinions

Mating Pinions for Slewing Ring Bearings

Silverthin is pleased to offer standard, high quality mating pinions from stock for our ST and SK series slewing ring bearings. These pinions are made of AISI 4140 steel and are hardened to have a surface hardness of 55-60 HRC. See below for dimensional data.

Mating Pinions for SK6 Series Slewing Rings

Mating Pinions for SK6 Series Slewing Rings
PINION
PART
NUMBER
BEARING
PART
NUMBER
GEAR DATA (α = 20°) OUTLINE DIMENSIONS APPROX
WT
(lbs)
TOOTH
FORM
TEETH
z1
Pd
(in)
b1
(in)
L1
(in)
D1
(in)
Do1
(in)
Dr1
(in)
Di1
(in)
w
(in)
SP1629-14SK6-16 thru SK6-29SD14422.883.53.92.8811/46.4
SP1629-17SK6-16 thru SK6-29SD17422.884.254.653.6311/410
SP3343-14SK6-33 thru SK6-43SD14322.884.6675.23.881.255/1611.4
SP3343-17SK6-33 thru SK6-43SD17322.885.6676.24.881.255/1618.3
Tolerances Ref. +/-0.015 +/-0.015 Ref. +0.000/
-0.010
Ref. +0.002/
-0.000

Mating Pinions for STE Series Slewing Rings

Mating Pinions for STE Series Slewing Rings
PINION
PART
NUMBER
BEARING
PART
NUMBER
GEAR DATA (α = 20°) OUTLINE DIMENSIONS APPROX
WT
(lbs)
TOOTH
FORM
TEETH
z1
Pd
(in)
b1
(in)
L1
(in)
D1
(in)
Do1
(in)
Dr1
(in)
Di1
(in)
w
(in)
SP145324-14STE-145 thru STE-324FS145/72.252.882.83.0862.20611/43.9
SP145324-17STE-145 thru STE-324FS175/72.252.883.43.6862.80611/46.6
SP415540-14STE-415 thru STE-540SD14422.883.53.92.8811/46.4
SP415540-17STE-415 thru STE-540SD17422.884.254.653.6311/410
SP590705-14STE-590 thru STE-705SD14322.884.6675.23.881.255/1611.4
SP590705-17STE-590 thru STE-705SD17322.885.6676.24.881.255/1618.3
SP870-17STE-870SD172.54.35.8256.87.445.512.6755/846.2
Tolerances Ref. +/-0.015 +/-0.015 Ref. +0.000/
-0.010
Ref. +0.002/
-0.000

Pinion/Gear Backlash

Backlash, sometimes referred to as play, is the amount of clearance between mating gears. (See Figure Below). For our purposes, the backlash would be between the slewing ring gear and mating pinion. This feature is often controlled by the center distance between the slewing ring and pinion, which can be either fixed or adjustable depending on the demands of the application. See typical backlash ranges table.

Typical Backlash Ranges

Typical Backlash Ranges
Gear
Pitch Dia
D2
(in)
Min
Backlash
J
(in)
1.5 1.75 2 2.5 3,4,5
20 0.014 0.029 0.027 0.025 0.023 0.022
30 0.015 0.030 0.028 0.026 0.024 0.023
40 0.016 0.031 0.029 0.027 0.025 0.024
60 0.018 0.033 0.031 0.029 0.027 0.026
80 0.020 0.035 0.033 0.031 0.029 0.028
100 0.022 0.037 0.035 0.033 0.03 0.030
120 0.024 0.039 0.037 0.035 0.033 0.032

Part Number Cross Reference

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