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)
PINION PART NUMBER	BEARING PART NUMBER	TOOTH FORM	TEETH z₁	P_d (in)	b₁ (in)	L₁ (in)	D₁ (in)	D_o1 (in)	D_r1 (in)	D_i1 (in)	w (in)	APPROX WT (lbs)
SP1629-14	SK6-16 thru SK6-29	TOOTH FORM	TEETH z₁	P_d (in)	b₁ (in)	L₁ (in)	D₁ (in)	D_o1 (in)	D_r1 (in)	D_i1 (in)	w (in)	SD	14	4	2	2.88	3.5	3.9	2.88	1	1/4	6.4
SP1629-17	SK6-16 thru SK6-29	SD	17	4	2	2.88	4.25	4.65	3.63	1	1/4	10
SP3343-14	SK6-33 thru SK6-43	SD	14	3	2	2.88	4.667	5.2	3.88	1.25	5/16	11.4
SP3343-17	SK6-33 thru SK6-43	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.	+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)
PINION PART NUMBER	BEARING PART NUMBER	TOOTH FORM	TEETH z₁	P_d (in)	b₁ (in)	L₁ (in)	D₁ (in)	D_o1 (in)	D_r1 (in)	D_i1 (in)	w (in)	APPROX WT (lbs)
SP145324-14	STE-145 thru STE-324	TOOTH FORM	TEETH z₁	P_d (in)	b₁ (in)	L₁ (in)	D₁ (in)	D_o1 (in)	D_r1 (in)	D_i1 (in)	w (in)	FS	14	5/7	2.25	2.88	2.8	3.086	2.206	1	1/4	3.9
SP145324-17	STE-145 thru STE-324	FS	17	5/7	2.25	2.88	3.4	3.686	2.806	1	1/4	6.6
SP415540-14	STE-415 thru STE-540	SD	14	4	2	2.88	3.5	3.9	2.88	1	1/4	6.4
SP415540-17	STE-415 thru STE-540	SD	17	4	2	2.88	4.25	4.65	3.63	1	1/4	10
SP590705-14	STE-590 thru STE-705	SD	14	3	2	2.88	4.667	5.2	3.88	1.25	5/16	11.4
SP590705-17	STE-590 thru STE-705	SD	17	3	2	2.88	5.667	6.2	4.88	1.25	5/16	18.3
SP870-17	STE-870	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.	+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

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