IS-2048_SPECIFICATION FOR PARALLEL KEYS AND KEYWAYS

IS : 2048 - 1983 (Reaffirmed 1999) Edition 3.1 (1986-09)

UDC 621.886.8

 Indian Standard    ]    )    8    6    6    3    (    1   :    4    4    C    D    E   :   c   o    D   :    f   e    R    [    1   :    4    4    C    D    E  ,   e   e    t    t    i   m   m   o   c    b   u    S   s    t    h   g    i   e    H   e    l   x    A    d   n   a   s    d   n    E    t    f   a    h    S  ,   s   y   a   w   y   e    K    d   n   a   s   y   e    K    d   n   a

  ;    4    4    C    D    E  ,   e   e    t    t    i   m   m   o    C    l   a   n   o    i    t   c   e    S   s   e   c    i   v   e    D   n   o    i   s   s    i   m   s   n   a   r    T

SPECIFICATION FOR PARALLEL KEYS AND KEYWAYS ( Second Revision ) (Incorporating Amendment No. 1) 1. Scope — Covers the dimensions and tolerances for parallel keys and keyways. 2. Types — The keys shall be of the following types: Type Type A — Keys Keys with with bot both h ends ends rou round nd.. Type Type B — Keys Keys with with both both ends ends squar square. e. Type Type C — Keys Keys with with both both ends ends round round with with hole hole for for one retaini retaining ng screw screw (for (for sizes sizes 8 × 7 and upwards and for key lengths above the stepped line in Table 4). Type Type D — Keys Keys with with both ends ends squar square e with hole for one one retai retaining ning screw screw (for (for sizes sizes 8 × 7 and upwards and for key lengths above the stepped line in Table 4). Type Type E — a) Keys Keys with with both both ends ends round round with with holes holes for two retain retaining ing screws screws (for (for sizes sizes 8 × 7 and and 10 × 8 and for key lengths below below the stepped stepped line in in Table 4), b) Additionally Additionally provided provided with tapped tapped hole for one or two jacking jacking screws screws for sizes 12 × 8 and and upwar upwards ds.. Type Type F — a) Keys Keys with with both ends ends squar square e with with holes holes for two retain retaining ing screws screws (for (for size sizess 8 × 7 and and 10 × 8 and for key lengths below below the stepped stepped line in in Table 4). b) Additionally Additionally provided provided with tapped tapped hole for one or two jacking jacking screws screws for sizes 12 × 8 and and upwar upwards ds.. Type G — Keys with both ends ends square square with chamfer chamfer and hole hole for for one retaining retaining screw. screw. Type H — Keys with both both ends square with chamfer chamfer and and holes holes for two retaining retaining screws. screws. Type Type J

— Keys Keys with both both ends ends square square with with chamfer chamfer and and hole for for one spri spring ng dowel dowel sleeve sleeve..

Note — Types A, C and E are meant for m achine tools application also.

3. Dimensions 3.1 Keys 3.1 Keys — Dimensions for keys are given in Table 1 read with Fig. 1. 3.1.1 Retaining screws, jacking screws and spring dowel sleeves for keys are given in T able 2. 3.2 Keyways 3.2 Keyways — Dimensions for keyways are given in Table 3. 3.3 Preferred 3.3 Preferred length and weight of keys — Preferred length and weight of keys is given in Table 4. parallel key key of Type A, A, width 12 mm, height height 8 mm and length length 50 mm shall shall be 4. Designation — A parallel designated as: Par Paralle allell Key Key A 12 12 × 8 × 50 upwards are required required to be supplied supplied without holes for for 4.1 If keys of Types E and F from 12 × 8 size upwards  jacking screws (oS), this shall be stated when ordering. In this case the designation for a key of Type E, width width 12 mm, height height 8 mm and length 50 mm shall shall be as follows: follows: Para Parall llel el Key Key EoS EoS 12 × 8 × 50

 Adopted 17 January 1983

BUREAU

 © BIS 2002

OF

INDIAN

Price Group 5

STANDARDS

MANAK BHAVAN MANAK  BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW NE W DELHI 110002

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IS : 2048 - 1983

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IS : 2048 - 1983

TABL TABLE E 1 DIME DIMENS NSIO IONS NS FOR FOR KEY KEYS S ( Clause 3.1 and Fig and Fig.. 1 )  All dimensions in millimetres. b

Tol on b h9

h

Tol on h*

a

s

Range of Key Length l

Range of Key Length (for Machine Tools Only)

Min

Max

Min

Max

Min

Max

—

0.16

0.25

6

20

—

—

—

0.16

0.25

6

36

—

—

—

0.16

0.25

8

45

10

45

—

0.25

0.40

10

56

12

56

6

—

0.25

0.40

14

70

16

70

7

3

0.25

0.40

18

90

20

90

8

3

0.40

0.60

22

110

25

110

3

0.40

0.60

28

140

32

140

3.5

0.40

0.60

36

160

40

160

10

4

0.40

0.60

45

180

45

180

18

11

4.5

0.40

0.60

50

200

50

200

20

12

5

0.60

0.80

56

220

56

220

5.5

0.60

0.80

63

250

63

250

5.5

0.60

0.80

70

280

70

250

2 3

0 –0.025

4 5

10

0 –0.030

0 –0.036

12 14 16

22 25

3

0 –0.025

4

6 8

2

5

8 0 –0.043

0 –0.052

0 –0.030

0 –0.090

9

14 14

0 –0.110

28

16

6.5

0.60

0.80

80

320

80

250

32

18

7

0.60

0.80

90

360

90

250

36

20

8

1.00

1.20

100

400

100

250

9

1.00

1.20

110

400

110

250

10

1.00

1.20

125

400

—

—

40

0 –0.062

22

0 –0.130

45

25

50

28

11

1.00

1.20

140

400

—

—

56

32

13

1.60

2.00

160

400

—

—

32

13

1.60

2.00

180

400

—

—

14

1.60

2.00

200

400

—

—

16

2.50

3.00

220

400

—

—

45

18

2.50

3.00

250

400

—

—

50

20

2.50

3.00

280

400

—

—

63 70

0 –0.074

80 90 100

36 40

0 –0.087

0 –0.160

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IS : 2048 - 1983 TABLE TABLE 2

DIMENSI DIMENSIONS ONS FOR RETAI RETAININ NING G SCREWS, SCREWS, JACKI JACKING NG SCREWS, SCREWS, AND SPRING DOWEL SLEEVES FOR FOR KEYS ( Clause 3.1. 3.1.1 1)  All dimensions in millimetres.

Holes for Retaining Screws, Jacking Screws and Spring Dowel Sleeves K ey Shaft d3 d4 d5 d6 l1 l4 d7 d8 l2 l3 l5 2×2 — — — — — — — — — — — 3×3 — — — — — — — — — — — 4×4 — — — — — — — — — — — 5×5 — — — — — — — — — — — 6×6 — — — — — — — — — — — 8×7 3.4 6 M3 4 2.4 4 M3 4.5 4 7 5 10 × 8 3.4 6 M3 4 2.4 4 M3 4.5 5 8 5 12 × 8 4.5 8 M4 5 3.2 5 M4 5.5 6 10 7 14 × 9 5.5 10 M5 6 4.1 6 M5 6.5 6 10 8 16 × 10 5.5 10 M5 6 4.1 6 M5 6.5 6 10 8 18 × 11 6.6 11 M6 8 4.8 7 M6 9 6 11 11 20 × 12 6.6 11 M6 8 4.8 8 M6 9 6 11 10 22 × 14 6.6 11 M6 8 4.8 8 M6 9 8 13 10 25 × 14 9.0 14 M8 10 6.0 10 M8 11 9 15 12 28 × 16 11 18 M10 12 7.3 10 M10 13 9 16 18 32 × 18 11 18 M10 12 7.3 12 M10 13 10 17 16 36 × 20 14 20 M12 16 8.3 14 M12 17 12 20 20 40 × 22 14 20 M12 16 8.3 16 M12 17 12 20 18 45 × 25 14 20 M12 16 8.3 16 M12 17 15 22 18 50 × 28 14 20 M12 16 8.3 16 M12 17 12 19 18 56 × 32 14 20 M12 16 8.3 16 M12 17 13 20 18 63 × 32 14 20 M12 16 8.3 16 M12 17 13 20 18 70 × 36 18 26 M16 20 11.5 20 M16 21 17 24 24 80 × 40 18 26 M16 20 11.5 20 M16 21 18 25 24 90 × 45 22 33 M20 25 13.5 25 M20 26 20 28 30 100 × 50 22 33 M20 25 13.5 25 M20 26 20 28 30 Note — Retaining screw and jacking screws are meant for machine tool applications also. Key b× h

*Dimensions for countersinks and counterbores.

Retaining Screw† Screw† — — — — — M3 × 8 M3 × 10 M4 × 10 M5 × 10 M5 × 10 M6 × 12 M6 × 12 M6 × 16 M8 × 16 M10 × 16 M10 × 20 M12 × 25 M12 × 25 M12 × 30 M12 × 30 M12 × 35 M12 × 35 M16 × 40 M16 × 45 M20 × 50 M20 × 55

Spring Dowel Sleeve‡ Sleeve‡ — — — — — 4×8 4×8 5 × 10 6 × 12 6 × 12 8 × 16 8 × 16 8 × 16 10 × 20 12 × 24 12 × 24 16 × 30 16 × 30 16 × 30 16 × 32 16 × 32 16 × 32 20 × 40 20 × 40 25 × 40 25 × 50

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TABLE TABLE 3 DIMENS DIMENSION IONS S FOR FOR KEYW KEYWAYS AYS ( Clause 3.2 )  All dimensions in millimetres.

Range of  Shaft Dia d  5  

Above

6 8 10 12 17 22 30 38 44 50 58 65 75 85 95 110 130 150 170 200 230 260 290 330 380 440

Key b×h

Keyway b

Up to

8 10 12 17 22 30 38 44 50 58 65 75 85 95 110 130 150 170 200 230 260 290 330 380 440 500

Tol on b Running fit

2×2 3×3 4×4 5×5 6×6 8×7 10 × 8 12 × 8 14 × 9 1 6 × 10 1 8 × 11 2 0 × 12 2 2 × 14 2 5 × 14 2 8 × 16 3 2 × 18 36 × 20 40 × 22 45 × 25 50 × 28 56 × 32 63 × 32 70 × 36 80 × 40 90 × 45 100 × 50

2 3 4 5 6 8 10 12 14 16 18 20 22 25 28 32 36 40 45 50 56 63 70 80 90 100

t1

Light drive fit

Force fit

Shaft H9 +0.025 0

Hub D10 +0.060 +0.020

Shaft N9 –0.004 –0.029

Hub Js9 +0.012 +0.012 5 –0.012 0.012 5

Shaft and Hub P9 –0.006 –0.031

+0.030 0

+0.078 +0.030

0 –0.030

+0.015 +0.015 0 –0.015 0.015 0

–0.012 –0.042

+0.036 0

+0.098 +0.040

0 –0.036

+0.018 +0.018 0 –0.018 0.018 0

–0.015 –0.051

+0.043 0

+0.120 +0.050

0 –0.043

+0.021 +0.021 5 –0.021 0.021 5

–0.018 –0.061

+0.052 0

+0.149 +0.065

0 –0.052

+0.026 +0.026 0 –0.026 0.026 0

–0.022 –0.074

+0.062 0

+0.180 +0.080

0 –0.062

+0.031 +0.031 0 –0.031 0.031 0

–0.026 –0.088

+0.074 0

+0.220 +0.100

0 –0.074

+0.037 +0.037 0 –0.03 0.037 70

–0.032 –0.106

+0.087 0

+0.260 +0.120

0 –0.087

+0.043 +0.043 5 –0.04 0.043 35

–0.037 –0.124

1.2 1.8 2.5 3.0 3.5 4.0 5.0 5.0 5.5 6.0 7.0 7.5 9.0 9.0 10.0 11.0 12.0 13.0 15.0 17.0 20.0 20.0 22.0 25.0 28.0 31.0

Tol on t1

+0.1 0

+0.2 0

+0.3 0

t2

1.0 1.4 1.8 2.3 2.8 3.3 3.3 3.3 3.8 4.3 4.4 4.9 5.4 5.4 6.4 7.4 8.4 9.4 10.4 11.4 12.4 12.4 14.4 15.4 17.4 19.5

Tol on t3

+0.1 0

+0.2 0

+0.3 0

Keyway for Machine Tools  Application

r Min

Max

0.08 0.08 0.08 0.16 0.16 0.16 0.25 0.25 0.25 0.25 0.25 0.40 0.40 0.40 0.40 0.40 0.70 0.70 0.70 0.70 1.20 1.20 1.20 2.00 2.00 2.00

0.16 0.16 0.16 0.25 0.25 0.25 0.40 0.40 0.40 0.40 0.40 0.60 0.60 0.60 0.60 0.60 1.00 1.00 1.00 1.00 1.60 1.60 1.60 2.50 2.50 2.50

t1

3 3.8 4.4 5.4 6 6 6.5 7.5 8 8 10 10 11 13 13.7 14

Tol on t1

+0.1 0

+0.2 0

t2

1.1 1.3 1.7 1.7 2.1 2.1 2.6 2.6 3.1 4.1 4.1 4.1 5.1 5.2 6.5 8.2

Tol on t3

+0.1 0

+0.2 0

I   S   :  2   0  4   8  1   9   8   3 

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I   S 

TABLE TABLE 4 PREFERRED PREFERRED LENGTH LENGTH AND AND WEIGHT WEIGHT OF KEYS KEYS ( Clause 3.3 ) Preferred Key ( b × h), mm Length 2 × 2 3 × 3 4 × 4 5 × 5 6 × 6 8 × 7 10 × 8 12 × 8 14 × 9 16 × 1018 × 1120 × 1222 × 1425 × 14 28 × 16 32 × 1836 × 2040 × 2245 × 2550 × 2856 × 3263 × 3270 × 3680 × 4090 × 45 100 100 × 50 ( l ) mm *Weight for Keys Type B, kg/1 000 Pieces (Approx) 6 0.188 0.423 8 0.251 0.565 1.01 10 0.314 0.707 1.26 1.95 12 0.377 0.848 1.51 2.35 14 16 18 20 22 25 28 32 36

 6  

40 45 50 56 63 70 80 90 100 110 125 140 160 180 200

0.440 0.502 0.565 0.628

0.989 1.13 1.27 1.41 1.55 1.77 1.98 2.26 2.54

1.76 2.01 2.26 2.51 2.76 3.14 3.52 4.02 4.52 5.02 5.65

2.75 3.94 3.14 4.52 3.53 5.09 3.92 5.65 4.32 6.22 4.91 7.07 5.50 7.91 6.28 9.04 7.06 10.2 7.85 8.83 9.81 11.0

11.3 12.7 14.1 15.8 17.8 19.8

7.93 8.80 9.67 11.0 12.3 14.1 15.8

13.8 15.7 17.6 20.1 22.6

21.1 24.1 27.1

35.6

17.6 19.8 22.0 24.6 27.7 30.8

25.1 28.3 31.4 35.2 39.6 44.0

30.1 33.9 37.7 42.2 47.5 52.8

39.6 44.5 49.5 55.4 62.3 69.2

35.2 39.6

50.2 56.5 62.8 69.1

60.3 79.1 67.8 89.0 7 5.4 98 75 9 8.9 8 2.9 109 82 94.2 124 106 138 158

56.5 62.8 70.3 79.1 88.0 10 100 1 11 13 124 138 157 176 201 226

77.7 87.0 97.9 109

106 119 132

152 169

192

124 140 155 171 194 218 249 280 311

151 170 188 207 235 264 301 339 377

193 218 242 266 302 338 387 435 484

220 247 275 302 343 385 440 495 550

281 317 352 387 440 492 563 633 703

414

532 604

604 687 769

774 880 985 1 130

21.1

220 250 280 320 360 400 Weight deduction 0.015 0.045 0.108 0.211 0.364 0.755 1.35 for Type A

1.94

2.97

4.31

6.00

8.09

11.4

14.7

Note — For machine tools application for keys ( b × h ), 4 × 4 to 40 × 22 preferred length ( l ) ranges from 10 to 250. *For calculations calculations of weights, density of steel taken as 7.85 g/cm 3.

407 452 497 565 633 723 814 904

565 622 706 791 904 1 020 1 130

760 863 967 1 110 1 240 1 380

1 100 1 240 1 410 1 590 1 770

1 540 1 760 1 980 2 200

2 080 2 340 2 600

2 750 3 060

3 800

995 1 130 1 270 1 440 1 630

1 240 1 410 1 580 1 810 2 040 2 260

1 520 1 730 1 930 2 210 2 480 2 760

1 940 2 210 2 470 2 820 3 180 3 530

2 420 2 750 3 080 3 510 3 950 4 400

2 860 3 250 3 640 4 170 4 690 5 200

3 370 3 830 4 290 4 900 5 510 6 120

4 180 5 520 4 750 6 280 7 880 53 5 320 7 030 8 820 6 090 7 930 10 100 6 850 9 030 11 350 7 600 10 040 12 600

31.1

43.7

59.3

85.3

118

169

214

298

433

615

11 000 12 600 14 200 15 700 844

 :  2   0  4   8  1   9   8   3 

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IS : 2048 - 1983 5. Tolerances on Length of Keys and Keyways Length of Key mm

Tolerance on Key Length mm

Keyway Length mm

Up to 28

– 0.2

+ 0.2

32 to 80

– 0.3

+ 0.3

90 and above

– 0.5

+ 0.5

6. Clause deleted 7. Material of Key — Steel of tensile strength not less than 600 MPa shall be used as material material for key. 8. Packing 8.1 Packages shall be made in such a way that keys are protected against mechanical damage in transit. 9. Marking 9.1 Such marks as may be specified by the purchaser shall be marked on the top or bottom surface of the parallel keys or in the packaging containing keys. 9.2 Certification Marking — Details available with the Bureau of Indian Standards.

EXPLANATORY

NOTE

Parallel keys and keyways were formerly covered in IS : 2048-1975 ‘Specification for parallel keys and keyways ( first ( first revision )’. However, parallel keys and keyways meant for machine tools were covere covered d in IS : 271 2710-19 0-1975 75 ‘Specification for parallel keys and keyways for machine tools (  first