Thin Section Bearings: SK6 SERIES

Pinions

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

Mating Pinions for SK Series Bearings

GEAR DATA (α = 20°) OUTLINE DIMENSIONS AND WEIGHT
TOOTH
FORM
z1 Pd
(in)
b1
(in)
L1
(in)
D1
(in)
Do1
(in)
Dr1
(in)
Di1
(in)
w
(in)
G
Approx
(lbs)
BEARING P/N PINION P/N
SK6-16 thru
SK6-29
SP1629-14 SD 14 4 2 2.88 3.5 3.9 2.88 1 1/4 6.4
SP1629-17 SD 17 4 2 2.88 4.25 4.65 3.63 1 1/4 10
SK6-33 thru
SK6-43
SP3343-14 SD 14 3 2 2.88 4.667 5.2 3.88 1.25 5/16 11.4
SP3343-17 SD 17 3 2 2.88 5.667 6.2 4.88 1.25 5/16 18.3
Tolerances Ref. +/-0.015 +/-0.015 Ref. +.000/-
.010
Ref. +0.002/-
.000

Mating Pinions for STE Series Bearings

GEAR DATA (α = 20°) OUTLINE DIMENSIONS AND WEIGHT
TOOTH
FORM
z1 Pd
(in)
b1
(in)
L1
(in)
D1
(in)
Do1
(in)
Dr1
(in)
Di1
(in)
w
(in)
G
Approx
(lbs)
BEARING P/N PINION P/N
STE-145 thru
STE-324
SP145324-14 FD 14 5/7 2.25 2.88 3.4 3.686 2.806 1 1/4 6.6
SP145324-17 FD 17 5/7 2.25 2.88 3.4 3.686 2.806 1 1/4 6.6
STE-415 thru
STE-540
SP415540-14 SD 14 3 2 2.88 3.5 3.9 2.88 1 1/4 6.4
SP415540-17 SD 17 3 2 2.88 4.25 4.65 3.63 1 1/4 10
STE-590 thru
STE-705
SP590705-14 SD 14 3 2 2.88 4.667 5.2 3.88 1.25 5/16 11.4
SP590705-14 SD 17 3 2 2.88 5.667 6.2 4.88 1.25 5/16 18.3
STE-870 SP870-17 SD 17 2.5 4.3 5.825 6.8 7.44 5.51 2.675 5/8 46.2
Tolerances Ref. +/-0.015 +/-0.015 Ref. +.000/-
.010
Ref. +0.002/-
.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
Gear
Pitch Dia,
D2 (in.)
Min
Backlash,
J (in.)
Maximum Backlash(in.)
Diametral Pitch (Pd)
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