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SUMITUBE® Shrink Tubing - Size Substitution
Occasionally customers may request odd sizes such as 5/16", 7/32", 5/8", etc. In some cases, there may exist a standard metric size that is close to the requested fractional size. This is particularly true with commercial grade poly such as F2(Z) and similar items. Table 1 lists the closest metric equivalents for some of the more commonly requested non-standard fractional inch sizes.

Alternatively, someone may request a metric (mm) size because a product may be specified in Japan or Europe, but the assembly is built in North America. In these cases, the end user sometimes has the flexibility to order fractional equivalents if it means, for example, being able to procure the material locally. Table 2 lists the closest fractional inch sizes for common metric tubing call-outs.

Table 1
Fractional
(inches)
Decimal
(inches)
Closest metric
(mm)
Metric
(inches)
5/32 0.156 4.0 0.157
7/32 0.219 5.0 / 6.0 0.197 / 0.236
9/32 0.281 7.0 0.276
5/16 0.313 8.0 0.315
7/16 0.438 11 0.433
9/16 0.563 14 0.551
5/8 0.625 16 0.630
7/8 0.875 22 0.866
1 1/4 1.250 30 1.181

Table 2
Metric
(mm)
Closest std.
fractional
inch size
Metric
(inches)
Metric
(mm)
Closest std.
fractional
inch size
Metric to
decimal
inches
1.0 3/64" 0.039 11   0.433
1.5 1/16" 0.059 12 1/2" 0.472
2.0   0.079 13   0.512
2.5 3/32" 0.098 14   0.551
3.0 1/8" 0.118 15   0.591
3.5   0.138 16   0.630
4.0 3/16" 0.157 18 3/4" 0.709
5.0   0.197 20   0.787
6.0 1/4" 0.236 22   0.866
7.0   0.276 25 1" 0.984
8.0   0.315 30 1 1/4" 1.181
9.0 3/8" 0.354 40 1 1/2" 1.575
10   0.394 50 2" 1.969


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