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Quality Gear at a Quality Price

How to choose the Right Blocks

We want to ensure that you get the right blocks for your needs. To that end we have created a guide to help you choose the right series and the block with the right working load for your needs: For a quick reference however you can use this chart:
Series 15 20 25 27 30 40 50 60 70
Max Line Size
5/16"
8mm
5/16"
8mm
3/8"
10mm
3/8"
10mm
1/2"
12mm
1/2"
12mm
5/8"
16mm
5/8"
16mm
3/4"
19mm
Sheave Diameter
1"
25mm
1-3/4"
44mm
2"
50mm
2-1/4"
57mm
2-1/2"
63mm
2-1/2"
63mm
3"
76mm
3-1/4"
82mm
4-1/4"
108mm
Safe Working Load
400lb
182kg
600lb
272kg
1150lb
520kg
2000lb
907kg
2400lb
1088kg
2800lb
1270kg
3000lb
1360kg
3500lb
1590kg
5000lb
2267kg
Series 15 20 25 27 30
Max Line Size
5/16"
8mm
5/16"
8mm
3/8"
10mm
3/8"
10mm
1/2"
12mm
Sheave Diameter
1"
25mm
1-3/4"
44mm
2"
50mm
2-1/4"
57mm
2-1/2"
63mm
Safe Working Load
400lb
182kg
600lb
272kg
1150lb
520kg
2000lb
907kg
2400lb
1088kg
Series 40 50 60 70
Max Line Size
1/2"
12mm
5/8"
16mm
5/8"
16mm
3/4"
19mm
Sheave Diameter
2-1/2"
63mm
3"
76mm
3-1/4"
82mm
4-1/4"
108mm
Safe Working Load
2800lb
1270kg
3000lb
1360kg
3500lb
1590kg
5000lb
2267kg
Series 15 20
Max Line Size
5/16"
8mm
5/16"
8mm
Sheave Diameter
1"
25mm
1-3/4"
44mm
Safe Working Load
400lb
182kg
600lb
272kg
Series 25 27
Max Line Size
3/8"
10mm
3/8"
10mm
Sheave Diameter
2"
50mm
2-1/4"
57mm
Safe Working Load
1150lb
520kg
2000lb
907kg
Series 30 40
Max Line Size
1/2"
12mm
1/2"
12mm
Sheave Diameter
2-1/2"
63mm
2-1/2"
63mm
Safe Working Load
2400lb
1088kg
2800lb
1270kg
Series 50 60
Max Line Size
5/8"
16mm
5/8"
16mm
Sheave Diameter
3"
76mm
3-1/4"
82mm
Safe Working Load
3000lb
1360kg
3500lb
1590kg
Series 70
Max Line Size
3/4"
19mm
Sheave Diameter
4-1/4"
108mm
Safe Working Load
5000lb
2267kg
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