Technical Area

Technical Area

At ALOK, research commences with the customers by requesting them to define their technical and engineering needs. Our products are developed with a concept of minimal costs and enhancement of our customers’ product quality.

Our passion for manufacturing excellence, commitment to world-class quality and on time delivery is clearly reflected in our state of art manufacturing facility Our plant located in Palghar District – Maharashtra, India houses the latest technologically advanced Machinery and Equipment.
We place tremendous confidence in our well-trained and highly skilled work force.

Imagine the satisfaction that lies in turning
a million dreams into reality

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Converstion Chart

Hardness Conversion Chart

TABLE 2A  Approximate Hardness Conversion Numbers for Nonaustenitic Steelsˆ 
(Rockwell C to other Hardness Numbers)
          Rockwell Superficial Hardness
Rockwell C Scale, 150-kgf Load, Diamond Penetrator Vickers Hardness Number Brinell Hardness, 3000-kgf Load, 10-mm Ball Knoop Hardness, 500-gf Load and Over Rockwell A Scale, 60-kgf Load, Diamond Penetrator 15N Scale, 15-kgf Load, Diamond Penetrator 30N Scale 30-kgf Load, Diamond Penetrator 45N Scale, 45-kgf Load, Diamond Penetrator Approximate Tensile Strength, ksi (MPa)
48 484 455 510 74.7 84.5 66.7 52.5 238 (1640)
47 471 442 495 74.1 83.9 65.8 51.4 229 (1580)
46 458 432 480 73.6 83.5 64.8 50.3 221 (1520)
45 446 421 466 73.1 83.0 64.0 49.0 215 (1480)
44 434 409 452 72.5 82.5 63.1 47.8 208 (1430)
43 423 400 438 72.0 82.0 62.2 46.7 201 (1390)
42 412 390 426 71.5 81.5 61.3 45.5 194 (1340)
41 402 381 414 70.9 80.9 60.4 44.3 188 (1300)
40 392 371 402 70.4 80.4 59.5 43.1 182 (1250)
39 382 362 391 69.9 79.9 58.6 41.9 177 (1220)
38 372 353 380 69.4 79.4 57.7 40.8 171 (1180)
37 363 344 370 68.9 78.8 56.8 39.6 166 (1140)
36 354 336 360 68.4 78.3 55.9 38.4 161 (1110)
35 345 327 351 67.9 77.7 55.0 37.2 156 (1080)
34 336 319 342 67.4 77.2 54.2 36.1 152 (1050)
33 327 311 334 66.8 76.6 53.3 34.9 149 (1030)
32 318 301 326 66.3 76.1 52.1 33.7 146 (1010)
31 310 294 318 65.8 75.6 51.3 32.5 141 (970)
30 302 286 311 65.3 75.0 50.4 31.3 138 (950)
29 294 279 304 64.6 74.5 49.5 30.1 135 (930)
28 286 271 297 64.3 73.9 48.6 28.9 131 (900)
27 279 264 290 63.8 73.3 47.7 27.8 128 (880)
26 272 258 284 63.3 72.8 46.8 26.7 125 (860)
25 266 253 278 62.8 72.2 45.9 25.5 123 (850)
24 260 247 272 62.4 71.6 45.0 24.3 119 (820)
23 254 243 266 62.0 71.0 44.0 23.1 117 (810)
22 248 237 261 61.5 70.5 43.2 22.0 115 (790)
21 243 231 256 61.0 69.9 42.3 20.7 112 (770)
20 238 226 251 60.5 69.4 41.5 19.6 110 (760)
TABLE 2B Approximate Hardness Conversion Numbers for Nonaustenitic Steels 
(Rockwell B to other Hardness Numbers) 
            Rockwell Superficial Hardness
Rockwell B Scale 100-kgf Load 1/16-in. (1.588-mm) Ball Vickers Hardness Number Brinell Hardness, 3000-kgf Load, 10-mm Ball Knoop Hardness, 500-gf Load and Over Rockwell F Scale, 60-kgf Load, 1/16-in. (1.588-mm) Ball Rockwell F Scale, 60-kgf Load, 1/16-in. (1.588-mm) Ball 15T Scale, 15-kgf Load, 1/16-in. (1.588-mm) Ball 30T Scale, 30-kgf Load, 1/16-in. (1.588-mm) Ball 45T Scale, 45-kgf Load, 1/16-in. (1.588-mm) Ball Approximate Tensile Strength ksi (MPa)
100 240 240 251 61.5 93.1 83.1 72.9 166 (800)
99 234 234 246 60.9 92.8 82.5 71.9 114 (785)
98 228 228 241 60.2 92.5 81.8 70.9 109 (750)
97 222 222 236 59.5 92.1 81.1 69.9 104 (715)
96 216 216 231 58.9 91.8 80.4 68.9 102 (705)
95 210 210 226 58.3 91.5 79.8 67.9 100 (690)
94 205 205 221 57.6 91.2 79.1 66.9 98 (675)
93 200 200 216 57.0 90.8 78.4 65.9 94 (650)
92 195 195 211 56.4 90.5 77.8 64.8 92 (635)
91 190 190 206 55.8 90.2 77.1 63.8 90 (620)
90 185 185 201 55.2 89.9 76.4 62.8 89 (615)
89 180 180 196 54.6 89.5 75.8 61.8 88 (605)
88 176 176 192 54.0 89.2 75.1 60.8 86 (590)
87 172 172 188 53.4 88.9 74.4 59.8 84 (580)
86 169 169 184 52.8 88.6 73.8 58.8 83 (570)
85 165 165 180 52.3 88.2 73.1 57.8 82 (565)
84 162 162 176 51.7 87.9 72.4 56.8 81 (560)
83 159 159 173 51.1 87.6 71.8 55.8 80 (550)
82 156 156 170 50.6 87.3 71.1 54.8 77 (530)
81 153 153 167 50.0 86.9 70.4 53.8 73 (505)
80 150 150 164 49.5 86.6 69.7 52.8 72 (495)
79 147 147 161 48.9 86.3 69.1 51.8 70 (485)
78 144 144 158 48.4 86.0 68.4 50.8 69 (475)
77 141 141 155 47.9 85.6 67.7 49.8 68 (470)
76 139 139 152 47.3 85.3 67.1 48.8 67 (460)
75 137 137 150 46.8 99.6 85.0 66.4 47.8 66 (455)
74 135 135 147 46.3 99.1 84.7 65.7 46.8 65 (450)
73 132 132 145 45.8 98.5 84.3 65.1 45.8 64 (440)
72 130 130 143 45.3 98.0 84.0 64.4 44.8 63 (435)
71 127 127 141 44.8 97.4 83.7 63.7 43.8 62 (425)
70 125 125 139 44.3 96.8 83.4 63.1 42.8 61 (420)
69 123 123 137 43.8 96.2 83.0 62.4 41.8 60 (415)
68 121 121 135 43.3 95.6 82.7 61.7 40.8 59 (405)
67 119 119 133 42.8 95.1 82.4 61.0 39.8 58(400)

Surface Roughness

Ra (micrometers) Ra (microinches) RMS CLA (N) Rt N Cut-off Length
inch mm
0.025 1 1.1 1 0.3 1 0.003 0.08
0.05 2 2.2 2 0.5 2 0.01 0.25
0.1 4 4.4 4 0.8 3 0.01 0.25
0.2 8 8.8 8 1.2 4 0.01 0.25
0.4 16 17.6 16 2.0 5 0.01 0.25
0.8 32 32.5 32 4.0 6 0.03 0.8
1.6 63 64.3 63 8.0 7 0.03 0.8
3.2 125 137.5 125 13 8 0.1 2.5
6.3 250 275 250 25 9 0.1 2.5
12.5 500 550 500 50 10 0.1 2.5
25.0 1000 1100 1000 100 11 0.3 8.0
50.0 2000 2200 2000 200 12 0.3 8.0
 
Ra = Roughness Average in micrometers or microinches.
RMS = Root Mean Square in microinches
CLA = Center Line Average in Microinches
Rt = Roughness Ttal in microns
N = New ISO (grade) scale numbers
Порезка = Length required for sample.

Inches to MM

inch Metric(mm) inch Metric(mm)
1/4 6.35 3 76.2
5/16 7.94 3 1/8 79.37
3/8 9.53 3 1/4 82.55
7/16 11.11 3 3/8 85.72
1/2 12.7 3 1/2 88.9
9/16 14.29 3 5/8 92.07
5/8 15.88 3 3/4 95.25
11/16 17.46 3 7/8 98.42
3/4 19.05 4 101.6
13/16 20.64 4 1/8 104.77
7/8 22.23 4 1/4 107.95
15/16 23.81 4 3/8 111.12
1 25.4 4 1/2 114.3
1 1/8 28.57 4 5/8 117.47
1 1/4 31.75 4 3/4 120.65
1 3/8 34.93 4 7/8 123.82
1 1/2 38.1 5 127
1 5/8 41.28 5 1/8 130.17
1 3/4 44.45 5 1/4 133.52
1 7/8 47.63 5 3/8 136.8
2 50.8 5 1/2 139.7
2 1/8 53.97 5 5/8 142.87
2 1/4 57.15 5 3/4 146.05
2 3/8 60.32 5 7/8 149.22
2 1/2 63.5 6 152.4
2 5/8 66.67 6 1/8 155.57
2 3/4 69.85 6 1/4 158.75
2 7/8 73.02 6 3/8 161.92

Feet to mm

Feet (ft’) Meter (Mtr) Feet (ft’) Meter (Mtr)
1 0.3 21 6.4
2 0.61 22 6.71
3 0.91 23 7.01
4 1.22 24 7.32
5 1.52 25 7.62
6 1.83 26 7.92
7 2.13 27 8.23
8 2.44 28 8.53
9 2.74 29 8.84
10 3.05 30 9.14
11 3.35 31 9.45
12 3.66 32 9.75
13 3.96 33 10.06
14 4.27 34 10.36
15 4.57 35 10.67
16 4.88 36 10.97
17 5.18 37 11.28
18 5.49 38 11.58
19 5.79 39 11.89
20 6.1 40 12.19

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