BEVEL GEARS - Boston Gear

BEVEL GEARS 

8 THROUGH 4 DIAMETRAL PITCH 20° PRESSURE ANGLE 

STEEL—UNHARDENED AND HARDENED 

AND CAST IRON 

All gears have “Coniflex” ® tooth form. 

All Hardened steel gears have teeth only hardened and are 

equipped with standard keyways and setscrews. 

MOUNTING 

DISTANCE 

PITCH 

DIA. 

BORE 

SETSCREW 

D 

HUB 

DIA. 

PITCH 

DIA. 

KEYWAY 

FACE 

D 

HUB 

PROJ. 

MOUNTING 

DISTANCE 

REFERENCE PAGES 

Alterations — 149 

Horsepower Ratings — 70 

Lubrication — 149 

Materials — 150 

Selection Procedure — 67 

ALL DIMENSIONS IN INCHES 

ORDER BY CATALOG NUMBER OR ITEM CODE 

*Mounting Distance (MD) must not be made less than dimension shown, see Page 144. 

STANDARD TOLERANCES 

DIMENSION TOLERANCE 

BORE All ±.0005 

No. of Pitch MD Hub Catalog Item Catalog Item Catalog Item 

Ratio Teeth Dia. Face Bore * D Dia. Proj. Number Code Number Code Number Code 

8 STEEL STEEL CAST IRON GEARS 

DIAMETRAL PITCH UNHARDENED HARDENED STEEL PINIONS 

40 5.000 .83 

1.000 

1.500 

2.875 1.850 3.00 1.25 

L156Y-G 12252 

— — 

— — 

HL156Y-G 11886 

— 

— 

— 

— 

2:1 20 2.500 .83 1.000 4.000 2.290 2.12 1.41 L156Y-P 12272 HL156Y-P 11888 — — 

40 

20 

5.000 

2.500 

.83 

1.000 

.875 

2.875 

4.000 

1.850 

2.290 

3.00 

2.12 

1.25 

1.41 

— 

— 

— 

— 

— 

— 

— 

— 

PA528Y-G 

PA528Y-P 

12424 

12426 

3:1 

48 

16 

6.000 

2.000 

.84 

.875 

.750 

2.375 

4.250 

1.632 

2.085 

2.75 

1.75 

1.00 

1.19 

— 

— 

— 

— 

— 

— 

— 

— 

PA638Y-G 

PA638Y-P 

12436 

12438 

4:1 

64 

16 

8.000 

2.000 

.85 

1.000 

.875 

2.750 

5.250 

1.882 

2.105 

2.75 

1.88 

1.25 

1.22 

— 

— 

— 

— 

— 

— 

— 

— 

PA848Y-G 

PA848Y-P 

12452 

12454 

72 

18 

9.000 

2.250 

1.23 

1.125 

.875 

3.250 

5.750 

2.320 

2.470 

3.00 

2.13 

1.69 

1.22 

— 

— 

— 

— 

— 

— 

— 

— 

PA948Y-G 

PA948Y-P 

12460 

12462 

6 

DIAMETRAL PITCH 

36 

18 

6.000 

3.000 

1.07 

1.06 

1.125 

3.500 

4.750 

2.260 

2.765 

3.25 

2.50 

1.50 

1.59 

L158Y-G 12278 

L158Y-P 12280 

— 

— 

— 

— 

— 

— 

— 

— 

36 6.000 1.07 1.750 3.500 2.260 3.25 1.50 — — HL158Y-G 11890 — — 

18 3.000 1.06 1.125 4.750 2.765 2.50 1.59 — — HL158Y-P 11892 — — 

2:1 

36 

18 

6.000 

3.000 

1.07 

1.125 

1.000 

3.500 

4.750 

2.260 

2.765 

3.25 

2.50 

1.50 

1.59 

— 

— 

— 

— 

— 

— 

— 

— 

PA626Y-G 

PA626Y-P 

12432 

12434 

42 

21 

7.000 

3.500 

1.06 

1.125 

1.000 

3.750 

5.000 

2.305 

2.515 

3.50 

2.50 

1.50 

1.25 

— 

— 

— 

— 

— 

— 

— 

— 

PA726Y-G 

PA726Y-P 

12440 

12442 

48 

24 

8.000 

4.000 

1.18 

1.125 

1.000 

3.438 

5.438 

1.898 

2.560 

3.25 

2.62 

1.00 

1.25 

— 

— 

— 

— 

— 

— 

— 

— 

PA826Y-G 

PA826-Y-P 

12448 

12450 

3:1 

45 

15 

7.500 

2.500 

1.08 

1.125 

.875 

3.000 

5.250 

2.132 

2.575 

3.25 

2.12 

1.25 

1.44 

— 

— 

— 

— 

— 

— 

— 

— 

PA7536Y-G 12520 

PA7536Y-P 12522 

5 


2:1 

30 

15 

6.000 

3.000 

1.05 

1.125 

1.000 

3.500 

4.375 

2.257 

2.390 

3.25 

2.62 

1.38 

1.28 

— 

— 

— 

— 

— 

— 

— 

— 

PA625Y-G 

PA625Y-P 

12428 

12430 

3:1 

45 9.000 

1.32 

1.250 3.750 2.507 3.75 1.69 — — — — PA935Y-G 12456 

15 3.000 1.000 5.875 2.685 2.62 1.31 — — — — PA935Y-P 12458 

4 


2:1 

32 

16 

8.000 

4.000 

1.40 

1.125 

1.125 

4.250 

6.000 

2.695 

3.350 

3.75 

3.25 

1.56 

1.81 

— 

— 

— 

— 

— 

— 

— 

— 

PA824Y-G 

PA824Y-P 

12444 

12446 

Gear Catalog 65

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BEVEL GEARS - Boston Gear

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