Extension springs can be supplied in all shapes and sizes and made from round, square or flat material. Extension springs are usually made from round wire, although square or rectangular wire is sometimes better adapted to special conditions.When ordering please send either a sample or a sketch of what is required, the details to be included are detailed below:

Diameter
Give the outside, inside or mean diameter. If the spring works in a hole, tube, cylinder or socket, mention this fact and state the size of the opening through which the spring must pass.

Length
In stating the length of an extension spring, always specify whether the length given is for the coiled part or body or the length overall including the hooks or loops on the ends. The length should be specified as the coiled part (or body Length) or as the over all length; distance from centre to centre of hooks or loops or distance from inside to inside of hooks or loops

Size and Shape of Material
Specify whether spring is made of round, square or flat material and give size of material in fractional or decimal parts of an inch/ millimetre. If the spring has to give a certain load at a certain extension, and for this reason the size of the material is unknown, we would refer you to the technical data section, where you will see the method of obtaining this information; paying special attention to the notes on Initial Tension.

Material
State if steel, brass or phosphor bronze, springs can be made from the regular carbon steels and from chrome vanadium, silico-maganese and other alloy steels.

Style of Ends
We would refer you to this section of the web site to view various types of ends for extension springs; special ends can also be supplied. Please send sketch showing type required.

Wire Diameter

d

mm

Outside Diameter

OD

mm

Free Length

LO

mm

Max Extended Length

LD

mm

Music Wire

Stainless Steel
Max Rec Load N Rate N/mm Product Code Max Rec Load N Rate N/mm Product Code
0.5 2.5 7.9 9.60 16.0 7.98 E5001 13.3 6.65 E6001
10.9 13.60 4.98 E5002 4.15 E6002
15.4 20.00 3.19 E5003 2.66 E6003
3.5 9.5 13.50 11.8 2.35 E5004 9.9 1.96 E6004
12.5 19.30 1.47 E5005 1.22 E6005
17.0 27.50 0.94 E5006 0.78 E6006
24.5 41.50 0.59 E5007 0.49 E6007
290.0 499.80 0.05 E5008 0.04 E6008
5.5 12.7 25.50 7.7 0.51 E5009 6.4 0.42 E6009
15.7 36.50 0.31 E50010 0.26 E60010
20.2 53.00 0.21 E50011 0.17 E60011
27.7 79.50 0.13 E50012 0.11 E60012
37.7 116.00 0.09 E50013 0.07 E60013
0.55 2.8 8.8 10.60 18.8 8.18 E50014 15.6 6.81 E60014
12.1 15.20 5.11 E50015 4.26 E60015
17.0 22.00 3.27 E50016 2,72 E60016
3.5 9.9 13.50 15.8 3.63 E50017 13.0 3.02 E60017
13.2 19.10 2.27 E50018 1.89 E60018
18.1 27.10 1.45 E50019 1.21 E60019
26.4 41.00 0.90 E50020 0.75 E60020
6.0 13.9 27.80 9.4 0.58 E50021 7.7 0.48 E60021
17.2 39.60 0.36 E50022 0.30 E60022
22.1 57.10 0.23 E50023 0.19 E60023
30.4 86.50 0.15 E50024 0.12 E60024
41.4 125.60 0.11 E50025 0.08 E60025
0.63 3.0 9.7 11.60 26.1 12.10 E50026 21.7 10.08 E60026
13.5 16.50 7.51 E50027 6.26 E60027
19.2 23.80 4.81 E50028 4.01 E60028
4.5 12.1 17.80 18.1 2.77 E50029 15.0 2.31 E60029
15.9 24.90 1.73 E50030 1.44 E60030
21.6 35.60 1.11 E50031 0.92 E60031
31.0 563.50 0.70 E50032 0.58 E60032
7.0 16.1 32.60 12.3 0.62 E50033 10.0 0.52 E60033
19.9 46.40 0.39 E50034 0.32 E60034
25.6 67.20 0.25 E50035 0.21 E60035
35.0 101.60 0.16 E50036 0.13 E60036
47.6 147.50 0.11 E50037 0.09 E60037
0.7 3.5 11.1 13.50 30.6 11.10 E50038 25.5 9.25 E60038
15.3 19.10 6.95 E50039 5.79 E60039
21.6 27.50 4.44 E50040 3.70 E60040
5.0 13.5 19.80 22.5 3.07 E50041 18.6 2.56 E60041
17.7 27.60 1.92 E50042 1.60 E60042
24.0 39.50 1.23 E50043 1.02 E60043
34.5 59.40 0.77 E50044 0.64 E60044
7.5 17.5 34.20 15.2 0.78 E50045 12.7 0.65 E60045
21.7 48.60 0.49 E50046 0.41 E60046
28.0 70.00 0.31 E50047 0.26 E60047
38.5 105.50 0.20 E50048 0.17 E60048
52.5 153.40 0.13 E50049 0.11 E60049
0.8 4.0 12.6 15.30 39.7 12.70 E50050 33.1 10.58 E60050
17.4 21.70 8.00 E50051 6.66 E60051
24.6 31.30 5.10 E50052 4.25 E60052
5.5 15.0 21.30 30.1 4.00 E50053 25.1 3.33 E60053
19.8 30.10 2.50 E50054 2.08 E60054
27.0 42.90 1.60 E50055 1.33 E60055
39.0 64.50 1.00 E50056 0.89 E60056
290.0 514.80 0.11 E50057 0.09 E60057
9.0 20.6 41.80 18.9 0.76 E50058 15.6 0.63 E60058
25.4 59.60 0.47 E50059 0.39 E60059
32.6 86.00 0.30 E50060 0.25 E60060
44.6 130.00 0.19 E50061 0.16 E60061
60.6 188.50 0.13 E50062 0.11 E60062
0.9 4.5 14.2 17.20 49.6 14.30 E50063 41.2 11.91 E60063
19.6 24.30 8.96 E50064 7.46 E60064
27.7 35.10 5.73 E50065 4.77 E60065
6.3 17.1 24.50 37.9 4.23 E50066 30.8 3.52 E60066
22.5 34.30 2.65 E50067 2.21 E60067
30.6 49.10 1.70 E50068 1.42 E60068
44.1 73.70 1.06 E50069 0.88 E60069
10.0 23.0 46.00 23.8 0.88 E50070 19.8 0.73 E60070
28.4 65.20 0.55 E50071 0.46 E60071
36.5 94.00 0.35 E50072 0.29 E60072
50.0 142.10 0.23 E50073 0.19 E60073
68.0 205.80 0.15 E50074 0.12 E60074
1.0 5.0 15.8 19.00 60.7 15.90 E50075 50.5 13.24 E60075
21.8 26.80 9.90 E50076 8.25 E60076
30.8 38.80 6.37 E50077 5.31 E60077
7.0 19.0 27.20 45.2 4.71 E50078 37.5 3.92 E60078
25.0 38.00 2.94 E50079 2.45 E60079
34.0 54.50 1.83 E50080 1.52 E60080
49.0 81.60 1.18 E50081 0.98 E60081
290.0 509.80 0.18 E50082 0.15 E60082
11.0 25.4 50.10 29.4 1.02 E50083 23.8 0.85 E60083
31.4 70.80 0.64 E50084 0.53 E60084
40.4 102.20 0.41 E50085 0.34 E60085
55.4 154.30 0.26 E50086 0.22 E60086
75.4 224.20 0.17 E50087 0.14 E60087
1.1 5.5 17.4 20.90 72.7 17.50 E50088 50.5 14.58 E60088
24.0 29.70 11.00 E50089 9.16 E60089
33.9 42.70 7.00 E50090 5.83 E60090
7.5 20.6 28.80 55.3 5.69 E50091 37.5 4.74 E60091
27.2 40.40 3.55 E50092 2.96 E60092
37.1 60.00 2.28 E50093 1.90 E60093
53.6 86.70 1.42 E50094 1.18 E60094
12.0 27.8 54.10 35.7 1.15 E50095 24.5 0.90 E60095
34.4 76.60 0.72 E50096 0.63 E60096
44.3 110.20 0.46 E50097 0.38 E60097
60.8 166.60 0.28 E50098 0.23 E60098
82.8 241.50 0.20 E50099 0.17 E60099
1.2 6.0 19.0 22.60 85.1 19.10 E50100 71.0 15.91 E60100
26.2 32.10 12.00 E50101 10.00 E60101
37.0 46.30 7.63 E50102 6.36 E60102
8.5 23.0 32.90 62.7 5.43 E50103 52.5 4.52 E60103
30.2 45.80 3.39 E50104 2.82 E60104
41.0 65.40 2.17 E50105 1.81 E60105
59.0 98.40 1.35 E50106 1.12 E60106
290.0 514.80 0.24 E50107 0.20 E60107
13.0 30.2 58.00 42.1 1.28 E50108 35.0 1.07 E60108
37.4 82.00 0.80 E50109 0.67 E60109
48.2 117.80 0.51 E50110 0.42 E60110
66.2 178.00 0.32 E50111 0.27 E60111
90.2 258.00 0.21 E50112 0.17 E60112
1.4 7.0 22.1 26.50 114.1 22.30 E50113 95.1 18.58 E60113
30.5 37.50 13.90 E50114 11.58 E60114
43.1 63.80 8.91 E50115 7.42 E60115
10.0 26.9 38.40 83.5 6.14 E50116 68.9 5.11 E60116
35.3 53.60 3.83 E50117 3.19 E60117
47.9 76.60 2.46 E50118 2.05 E60118
68.9 115.00 1.54 E50119 1.28 E60119
290.0 509.80 0.32 E50120 0.27 E60120
15.0 34.9 66.00 57.0 1.55 E50121 47.3 1.29 E60121
43.3 93.10 0.97 E50122 0.81 E60122
55.9 133.80 0.62 E50123 0.52 E60123
76.9 202.00 0.39 E50124 0.32 E60124
105.0 291.80 0.26 E50125 0.22 E60125
1.6 8.0 25.3 30.20 145.8 25.40 E50126 122.1 21.16 E60126
34.9 42.70 15.90 E50127 13.24 E60127
49.3 61.40 10.20 E50128 8.50 E60128
11.0 30.1 41.70 110.7 8.04 E50129 91.8 6.70 E60129
39.7 58.30 5.02 E50130 4.18 E60130
54.1 83.30 3.22 E50131 2.68 E60131
78.1 125.00 2.01 E50132 1.67 E60132
17.0 39.7 73.80 73.8 1.82 E50133 61.7 1.52 E60133
49.3 103.80 1.14 E50134 0.95 E60134
63.7 149.20 0.73 E50135 0.61 E60135
87.7 224.50 0.46 E50136 0.38 E60136
120.0 324.80 0.30 E50137 0.25 E60137
1.8 9.0 28.4 33.80 180.1 28.60 E50138 151.0 22.82 E60138
39.2 47.80 17.80 E50139 14.83 E60139
55.4 68.70 11.50 E50140 9.58 E60140
12.0 33.2 45.00 140.5 10.10 E50141 116.4 8.41 E60141
44.0 62.80 6.28 E50142 5.23 E60142
60.2 89.90 4.02 E50143 3.35 E60143
87.2 134.60 2.52 E50144 2.10 E60144
290.0 464.80 0.68 E50145 0.57 E60145
20.0 46.0 87.80 86.8 1.78 E50146 71.9 1.48 E60146
56.8 123.70 1.11 E50147 0.92 E60147
73.0 177.80 0.71 E50148 0.59 E60148
100.0 266.80 0.44 E50149 0.37 E60149
136.0 386.80 0.29 E50150 0.24 E60150
2.0 10.0 31.6 37.50 219.3 31.80 E50151 182.6 26.49 E60151
43.6 53.00 19.90 E50152 16.58 E60152
61.6 76.20 12.80 E50153 10.66 E60153
14.0 38.0 52.60 165.0 9.42 E50154 136.8 7.85 E60154
50.0 73.50 5.88 E50155 4.90 E60155
68.0 105.00 3.77 E50156 3.14 E60156
98.0 154.80 2.35 E50157 1.96 E60157
22.0 50.8 95.40 106.7 2.03 E50158 88.7 1.69 E60158
62.8 134.20 1.27 E50159 1.06 E60159
80.8 192.70 0.81 E50160 0.67 E60160
110.0 289.80 0.51 E50161 0.42 E60161
151.0 418.80 0.34 E50162 0.28 E60162
2.2 11.0 34.8 41.00 258.3 35.00 E50163 215.8 29.16 E60163
48.0 58.00 21.90 E50164 18.24 E60164
67.8 83.50 14.00 E50165 11.66 E60165
15.0 41.2 55.80 197.6 11.40 E50166 164.3 9.50 E60166
54.4 78.00 7.10 E50167 5.91 E60167
74.2 111.20 4.55 E50168 3.79 E60168
107.0 166.00 2.84 E50169 2.37 E60169
24.0 55.6 102.50 127.1 2.31 E50170 105.9 1.92 E60170
68.8 144.00 1.44 E50171 1.20 E60171
88.6 206.60 0.92 E50172 0.77 E60172
122.0 309.80 0.58 E50173 0.48 E60173
166.0 447.80 0.38 E50174 0.32 E60174
2.5 13.0 40.3 48.10 316.4 34.30 E50175 263.7 28.57 E60175
55.3 67.50 21.50 E50176 17.91 E60176
77.8 97.30 13.70 E50177 11.41 E60177
18.0 48.3 67.00 236.8 10.70 E50178 196.2 8.91 E60178
63.3 93.50 6.67 E50179 5.56 E60179
85.8 133.00 4.27 E50180 3.56 E60180
123.0 198.50 6.67 E50181 2.22 E60181
28.0 64.3 120.00 156.4 2.39 E50182 130.8 1.99 E60182
79.3 168.00 1.50 E50183 1.25 E60183
102.0 240.50 0.96 E50184 0.80 E60184
139.0 360.50 0.60 E50185 0.50 E60185
189.0 521.50 0.40 E50186 0.33 E60186
2.8 14.0 44.2 52.00 399.8 44.60 E50187 332.0 37.15 E60187
61.0 53.00 27.90 E50188 23.24 E60188
86.2 105.00 17.90 E50189 14.91 E60189
20.0 53.8 74.10 292.6 12.30 E50190 243.8 10.25 E60190
70.6 102.50 7.68 E50191 6.40 E60191
95.8 146.30 4.91 E50192 4.09 E60192
138.0 218.80 3.07 E50193 2.56 E60193
30.0 69.8 124.30 198.7 3.11 E50193 166.3 2.59 E60193
86.6 174.00 1.94 E50195 1.62 E60195
112.0 248.50 1.25 E50196 1.04 E60196
154.0 372.50 0.78 E50197 0.65 E60197
210.0 537.50 0.52 E50198 0.43 E60198
3.2 16.0 50.6 59.00 509.4 50.90 E50199 425.1 42.40 E60199
69.8 83.10 31.80 E50200 26.49 E60200
98.6 120.00 20.40 E50201 16.99 E60201
22.0 60.2 80.60 385.4 16.10 E50202 321.6 13.41 E60202
79.4 112.00 10.00 E50203 8.33 E60203
108.0 159.00 6.48 E50204 5.40 E60204
156.0 237.50 4.02 E50205 3.35 E60205
36.0 82.6 150.80 242.7 3.02 E50206 201.5 2.52 E60206
102.0 210.80 1.89 E50207 1.57 E60207
131.0 301.80 1.21 E50208 1.01 E60208
179.0 452.80 0.76 E50209 0.63 E60209
243.0 652.80 0.50 E50210 0.42 E60210
3.6 18.0 56.9 66.20 629.2 57.20 E50211 523.6 47.65 E60211
78.5 93.40 35.80 E50212 29.82 E60212
111.0 134.20 22.90 E50213 19.08 E60213
25.0 68.1 91.00 471.7 17.50 E50214 392.8 14.58 E60214
89.7 126.30 10.90 E50215 9.08 E60215
122.0 179.40 6.98 E50216 581 E60216
176.0 268.00 4.37 E50217 3.64 E60217
40.0 92.1 164.50 303.8 3.54 E50218 253.1 2.95 E60218
114.0 230.50 2.22 E50219 1.85 E60219
146.0 327.50 1.42 E50220 1.18 E60220
200.0 491.50 0.88 E50221 0.73 E560221
272.0 708.50 0.59 E50222 0.49 E60222
4.0 20.0 63.2 73.00 756.6 63.60 E50223 360.2 52.98 E60223
87.2 103.00 39.70 E50224 33.07 E60224
123.0 148.00 25.40 E50225 21.16 E60225
28.0 76.0 101.00 562.0 18.80 E50226 469.7 15.66 E60226
100.0 140.00 11.80 E50227 9.83 E60227
136.0 199.00 7.54 E50228 6.28 E60228
196.0 297.50 4.71 E50229 3.92 E60229
45.0 103.0 184.00 360.8 3.78 E50230 299.8 3.15 E60230
127.0 257.00 2.36 E50231 1.97 E60231
163.0 366.00 1.51 E50232 1.26 E60232
223.0 548.00 0.94 E50233 0.78 E60233
303.0 790.00 0.63 E50234 0.52 E60234
4.5 22.0 70.3 80.50 950.5 77.90 E50235 791.8 64.89 E60235
97.3 114.00 48.70 E50236 40.57 E60236
138.0 164.00 31.20 E50237 25.99 E60237
32.0 86.3 115.00 684.6 20.10 E50238 569.5 16.74 E60238
113.0 160.00 12.60 E50239 10.50 E60239
154.0 226.00 8.03 E50240 6.69 E60240
221.0 336.00 5.01 E50241 4.17 E60241
50.0 115.0 201.00 450.8 4.43 E50242 375.4 3.69 E60242
142.0 279.00 2.77 E50243 2.31 E60243
183.0 400.00 1.78 E50244 1.48 E60244
250.0 595.00 1.11 E50245 0.92 E60245
340.0 857.00 0.74 E50246 0.62 E60246
5.0 25.0 79.0 91.00 1109.0 79.50 E50247 924.5 66.22 E60247
109.0 127.00 49.70 E50248 41.70 E60248
154.0 183.00 31.80 E50249 26.49 E60249
36.0 96.6 128.00 807.5 21.40 E50250 672.8 17.83 E60250
127.0 178.00 13.30 E50251 11.08 E60251
172.0 252.00 8.54 E50252 7.11 E60252
247.0 375.00 5.34 E50253 4.45 E60253
55.0 127.0 217.00 542.5 5.09 E50254 452.1 4.24 E60254
157.0 301.00 3.18 E50255 2.65 E60255
202.0 427.00 2.04 E50256 1.70 E60256
277.0 638.00 1.28 E50257 1.07 E60257
377.0 920.00 0.84 E50258 0.70 E60258

EXTENSION SPRINGS CAN BE MADE SPECIFICALLY TO YOUR DESIGN PLEASE CONTACT OUR SPECIAL COMPONENTS DIVISION FOR DETAILS