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Blocks
 

Blocks by Type & Sheave Size 

Single Block Double Blocks Triple Blocks Cheek Blocks Fiddle Blocks Snatch Blocks Lead Blocks
Singles Doubles Triples Cheeks Fiddles Snatches Leads
5/8"
to
1"

Micro

Micro

Micro

Micro

Micro

Micro

Micro
16mm
to
26mm
1-1/8"
to
1-1/2"

Small

Small

Small

Small

Small

Small

Small
27mm
to
38mm
1-9/16"
to
2-5/16"

Medium

Medium

Medium

Medium

Medium

Medium

Medium
40mm
to
59mm
2-3/8"
to
3-1/2"

Large

Large

Large

Large

Large

Large

Large
60mm
to
89mm
3-9/16"
to
7+"

Maxi

Maxi

Maxi

Maxi

Maxi

Maxi

Maxi
90mm
to
180mm
 

Blocks by Manufacturer

Harken Ronstan Schaefer
 

Blocks by Max line size 

Singles Doubles Triples Cheeks Fiddles Snatches Leads
3/16" 3/16"  3/16"  3/16"  3/16"  3/16"  3/16"
1/4" 1/4" 1/4" 1/4" 1/4" 1/4" 1/4"
 5/16"  5/16"  5/16"  5/16"  5/16"  5/16"  5/16"
 3/8"  3/8"  3/8"  3/8"  3/8"  3/8"  3/8"
 7/16"  7/16"  7/16"  7/16"  7/16"  7/16"  7/16"
 1/2"  1/2"  1/2"  1/2"  1/2"  1/2"  1/2"
 9/16"  9/16"  9/16"  9/16"  9/16"  9/16"  9/16"
 5/8"  5/8"  5/8"  5/8"  5/8"  5/8"  5/8"
 

Blocks by Working Load Limit in lbs

Singles Doubles Triples Cheeks Fiddles Snatches Leads
150-300 150-300 150-300 150-300 150-300 150-300 150-300
301-500 301-500 301-500 301-500 301-500 301-500 301-500
501-750 501-750 501-750 501-750 501-750 501-750 501-750
751-1000 751-1000 751-1000 751-1000 751-1000 751-1000 751-1000
1001-1500 1001-1500 1001-1500 1001-1500 1001-1500 1001-1500 1001-1500
1501-2000 1501-2000 1501-2000 1501-2000 1501-2000 1501-2000 1501-2000
2001-2500 2001-2500 2001-2500 2001-2500 2001-2500 2001-2500 2001-2500
2501-3000 2501-3000 2501-3000 2501-3000 2501-3000 2501-3000 2501-3000
3001-4000 3001-4000 3001-4000 3001-4000 3001-4000 3001-4000 3001-4000
4001-5000 4001-5000 4001-5000 4001-5000 4001-5000 4001-5000 4001-5000
5001-7000 5001-7000 5001-7000 5001-7000 5001-7000 5001-7000 5001-7000
7001-10000 7001-10000 7001-10000 7001-10000 7001-10000 7001-10000 7001-10000
10001+ 10001+ 10001+ 10001+ 10001+ 10001+ 10001+
 

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