Metric Worms, Worm Gears Module 2

Quality Transmission is the largest North American supplier of off-the-shelf metric gearing.

Specifications
Catalog No.	SW	BG	CG
Precision grade	KHK W 001 grade 4	KHK W 002 grade 4	KHK W 002 grade 4
Reference section of gear	Normal plane	Normal plane	Normal plane
Gear teeth	JIS 3 type Standard full depth	Standard full depth	Standard full depth
Normal pressure angle	1430'	1430'	1430'
Material	S45C (Carbon steel)	PBC2 and BC6 (Bronz)	FC200 (Gray iron)
Heat treatment	-	-	-
Surface hardness	Less than 194	-	-
Surface treatment	Black oxide	-	-
Surface finish	Thread rolled (Cut)	Cut	Cut
Datum reference surface for gear cutting	Bore	Bore	Bore


W1	H1	HB

Module 2 Worms

Catalog No.	Number of start	Hand of thread	Bore	Hub dia.	Pitch dia.	Outside dia.	Face width	Hub width (R)	Hub width (L)	Total length	Screw		Shape	Weight (kgf)
Catalog No.	Number of start	Hand of thread	L_H7	M	N	O	P	Q	Q'	R	Size	S	Shape	Weight (kgf)
SW2-R1 [ DXF \| DWG \| 3D CAD] SW2-R2 [ DXF \| DWG \| 3D CAD]	1 2	R R	12 12	25 25	31 31	35 35	32 32	14 14	- -	46 46	- -	- -	W1 W1	0.2 0.2

Catalog No. Number of
start Hand of
thread Bore Hub dia. Pitch dia. Outside dia. Face width Hub width (R) Hub width (L) Total length Screw Shape Weight
(kgf)

L_H7 M N O P Q Q' R Size S

SW2-L1
[ DXF | DWG | 3D CAD]
SW2-L2
[ DXF | DWG | 3D CAD] 1

2

L

L

12

12

25

25

31

31

35

35

32

32

14

14

-

-

46

46

-

-

-

-

W1

W1

0.2

0.2

CAUTION: SW2-R1 and R2 are produced by thread rolling.

Lead Angle R1(L1) 3

42' R2(L2) 7

25'

Module 2 Worm Gears

Catalog No.	Reduction ratio	No. of teeth	Coefficient of profile shift	Number of start	Hand of thread	Bore	Hub dia.	Pitch dia.	Throat dia.	Outside dia.	Face width	Hub width	Total length	Mounting distance	Shape	Allowable torque (kgfm)	Allowable torque (Nm)	Backlash (mm)	Weight (kgf)	Catalog No.
Catalog No.	Reduction ratio	No. of teeth	Coefficient of profile shift	Number of start	Hand of thread	A_H7	B	C	D	D'	E	F	G	J	Shape	Surface durability	Surface durability	Backlash (mm)	Weight (kgf)	Catalog No.
BG2-20R1 [ DXF\|DWG \| 3D CAD] BG2-20R2 [ DXF\|DWG \| 3D CAD]	1/20 1/10	20 20	-0.021 -0.084	1 2	R R	12 12	33 33	40.08 40.34	44 44	46 46	22 22	13 13	35 35	35.5 35.5	H1	0.4 0.38	3.95 3.69	0.140.24 0.140.24	0.3	BG2-20R1 BG2-20R2

Catalog No.	Reduction ratio	No. of teeth	Coefficient of profile shift	Number of start	Hand of thread	Bore	Hub dia.	Pitch dia.	Throat dia.	Outside dia.	Face width	Hub width	Total length	Mounting distance	Shape	Allowable torque (kgfm)	Allowable torque (Nm)	Backlash (mm)	Weight (kgf)	Catalog No.
Catalog No.	Reduction ratio	No. of teeth	Coefficient of profile shift	Number of start	Hand of thread	A_H7	B	C	D	D'	E	F	G	J	Shape	Surface durability	Surface durability	Backlash (mm)	Weight (kgf)	Catalog No.
BG2-20L1 [ DXF\|DWG \| 3D CAD] BG2-20L2 [ DXF\|DWG \| 3D CAD]	1/20 1/10	20 20	-0.021 -0.084	1 2	L L	12 12	33 33	40.08 40.34	44 44	46 46	22 22	13 13	35 35	35.5 35.5	H1	0.4 0.38	3.95 3.69	0.140.24 0.140.24	0.3	BG2-20L1 BG2-20L2

Module 2 Worm Gears

Catalog No.	Reduction ratio	No. of teeth	Coefficient of profile shift	Number of start	Hand of thread	Bore	Hub dia.	Pitch dia.	Throat dia.	Outside dia.	Face width	Hub width (R)	Hub width (L)	Total length	Web thickness	Web O.D.	Mounting distance	Shape	Allowable torque (kgfm)	Allowable torque (Nm)	Backlash (mm)	Weight (kgf)	Catalog No.
Catalog No.	Reduction ratio	No. of teeth	Coefficient of profile shift	Number of start	Hand of thread	A_H7	B	C	D	D'	E	F	F'	G	H	I	J	Shape	Surface durability	Surface durability	Backlash (mm)	Weight (kgf)	Catalog No.
CG2-20R1 [ DXF\|DWG \| 3D CAD] CG2-20R2 [ DXF\|DWG \| 3D CAD] CG2-30R1 [ DXF\|DWG \| 3D CAD] CG2-30R2 [ DXF\|DWG \| 3D CAD] CG2-40R1 [ DXF\|DWG \| 3D CAD]	1/20 1/10 1/30 1/15 1/40	20 20 30 30 40	-0.021 -0.084 -0.031 -0.127 -0.042	1 2 1 2 1	R R R R R	12 12 12 12 12	33 33 40 40 45	40.08 40.35 60.13 60.51 80.17	44 44 64 64 84	46 46 66 66 86	22 22 22 22 22	13 13 13 13 13	- - - - -	35 35 35 35 35	- - - - -	- - - - -	35.5 35.5 45.5 45.5 55.5	H1 H1 H1 H1 H1	0.4 0.38 0.89 0.83 1.57	3.95 3.69 8.74 8.15 15.36	0.140.24 0.140.24 0.140.24 0.140.24 0.140.24	0.25 0.25 0.53 0.53 0.9	CG2-20R1 CG2-20R2 CG2-30R1 CG2-30R2 CG2-40R1
CG2-50R1 [ DXF\|DWG \| 3D CAD] CG2-50R2 [ DXF\|DWG \| 3D CAD] CG2-60R1 [ DXF\|DWG \| 3D CAD]	1/50 1/25 1/60	50 50 60	-0.052 -0.211 -0.063	1 2 1	R R R	12 12 12	48 48 60	100.21 100.84 120.25	104 104 124	106 106 126	22 22 22	13 13 13	- - -	35 35 35	7 7 7	88 88 108	65.5 65.5 75.5	HB HB HB	2.41 2.28 3.4	23.58 22.38 33.31	0.140.24 0.140.24 0.140.24	1 1 1.3	CG2-50R1 CG2-50R2 CG2-60R1

Catalog No. Reduction
ratio No. of
teeth Coefficient of
profile shift Number of
start Hand of
thread Bore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width (R) Hub width (L) Total length Web
thickness Web O.D. Mounting
distance Shape Allowable
torque (kgfm) Allowable
torque (Nm) Backlash
(mm) Weight
(kgf) Catalog No.

A_H7 B C D D' E F F' G H I J Surface
durability Surface
durability

CG2-20L1
[ DXF|DWG | 3D CAD]
CG2-20L2
[ DXF|DWG | 3D CAD]
CG2-30L1
[ DXF|DWG | 3D CAD]
CG2-30L2
[ DXF|DWG | 3D CAD]
CG2-40L1
[ DXF|DWG | 3D CAD] 1/20

1/10

1/30

1/15

1/40

20

20

30

30

40

-0.021

-0.084

-0.031

-0.127

-0.042

1

2

1

2

1

L

L

L

L

L

12

12

12

12

12

33

33

40

40

45

40.08

40.35

60.13

60.51

80.17

44

44

64

64

84

46

46

66

66

86

22

22

22

22

22

13

13

13

13

13

-

-

-

-

-

35

35

35

35

35

-

-

-

-

-

-

-

-

-

-

35.5

35.5

45.5

45.5

55.5

H1

H1

H1

H1

H1

0.4

0.38

0.89

0.83

1.57

3.95

3.69

8.74

8.15

15.36

0.140.24

0.140.24

0.140.24

0.140.24

0.140.24

0.25

0.25

0.53

0.53

0.9

CG2-20L1

CG2-20L2

CG2-30L1

CG2-30L2

CG2-40L1

CG2-50L1
[ DXF|DWG | 3D CAD]
CG2-50L2
[ DXF|DWG | 3D CAD]
CG2-60L1
[ DXF|DWG | 3D CAD] 1/50

1/25

1/60

50

50

60

-0.052

-0.211

-0.063

1

2

1

L

L

L

12

12

12

48

48

60

100.21

100.84

120.25

104

104

124

106

106

126

22

22

22

13

13

13

-

-

-

35

35

35

7

7

7

88

88

108

65.5

65.5

75.5

HB

HB

HB

2.41

2.28

3.4

23.58

22.38

33.31

0.140.24

0.140.24

0.140.24

1

1

1.3

CG2-50L1

CG2-50L2

CG2-60L1

*CAUTION:*	Before assembling or performing any secondary operations, please carefully read the "Application Hints" at the beginning of this section.
*CAUTION:*	Heat treating these worms is not recommended since it will introduce errors in the lead and pressure angles, producing poor gear mesh.
*CAUTION:*	These worm gears are profile shifted to create the proper center distance.
*NOTE:*	Allowable torques shown in the table are the calculated values according to JGMA Standards 405-01 when the worm is rotating at 600 rpm, The table below shows the allowable worm gear torques at selected worm speeds.
*NOTE:*	SUW worms may also be used to mate with BG and CG worm gears.

BG2 Allowable Worm Gear Torques(kgfm)

Catalog No.	Worms rpm
Catalog No.	30	100	300	600	900	1200
BG2-20R1 BG2-20R2	0.75 0.75	0.63 0.61	0.49 0.46	0.40 0.38	0.35 0.33	0.32 0.29

CG2 Allowable Worm Gear Torques(kgfm)

Catalog No.	Worms rpm
Catalog No.	30	100	300	600	900	1200
CG2-20R1 CG2-20R2 CG2-30R1 CG2-30R2 CG2-40R1 CG2-50R1 CG2-50R2 CG2-60R1	0.75 0.75 1.59 1.60 2.72 4.11 4.15 5.76	0.63 0.61 1.34 1.33 2.30 3.48 3.46 4.89	0.49 0.46 1.06 1.02 1.85 2.82 2.74 3.97	0.40 0.38 0.89 0.83 1.57 2.40 2.28 3.40	0.35 0.33 0.78 0.73 1.38 2.14 2.00 3.05	0.32 0.29 0.71 0.66 1.25 1.95 1.82 2.77

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