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Rope Sizes
Nominal
MM
Decimal
(Inch)
Range
Equivalent
9
0.354
3/8"
10
0.394
7/16"
11
0.433
12
0.472
1/2"
13
0.512
9/16"
14
0.551
15
0.591
5/8"
16
0.63
17
0.669
11/16"
18
0.709
19
0.748
3/4"
20
0.787
620, 621 or 622
Outer Shims
Lining Wear Spacer +
Spacer Shims between
Excess Spacers on
Block and Shoe
Back of Block
1/8"
1/32 + 2 x 1/16 + 1/8"
1/8"
1/32 + 1/16 + 1/8"
1/16 + 1/8"
2 x 1/8"
1/16 + 2 x 1/8"
Inner Shims
Outer Shims
Lining Wear Spacer +
Excess Spacers on
Back of Block
1/32 + 1/8"
1/16 + 1/8"
1/32 + 1/16"
2 x 1/8"
1/32"
1/16 + 2 x 1/8"
1/16 + 2 x 1/8"
1/32 + 1/16 + 2 x 1/8
624, 625, 626 & 626SPL
Inner Shims
Spacer Shims between
Block and Shoe
1/8"
1/32 + 2 x 1/16 + 1/8"
1/8"
1/32 + 1/16 +1/8"
1/32 + 1/8"
1/32 + 1/16"
1/32"
1/32 & Flip Block Thin
Side to Ropes
Flip Block Thin Side
to Ropes
CHART 3
FIGURE 7
BULLETIN 1144
Page 11 of 29
11/12/19
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