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Holt Blocks Catalogue

Holt Blocks Catalogue
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Holt Blocks Catalogue

Product catalog summary
Overview: The document details specifications and technical information for Holt's marine blocks, categorized by sheave size, material, and usage, with specific part numbers provided.
20MM Dynamic Blocks: These blocks have a 20mm acetal resin sheave, glass-filled nylon cheeks, and 316 stainless steel straps. They support line sizes of 2.5-6mm and are used in control lines and cunningham systems. Features include a dynamic bearing system with stainless ball bearings.
30MM Dynamic Blocks: Featuring a 30mm sheave, these blocks are suitable for line sizes of 5-10mm, used in mainsheet and backstay systems. They have a full composite body for lightweight performance.
40MM Blocks: With a 40mm sheave, these blocks are made from acetal resin with an aluminium axle, supporting line sizes of 5-12mm. They are used in sheet blocks and backstay systems, featuring an organic bearing system for high load capacity.
57MM Blocks: These blocks have a 57mm sheave made from acetal resin or high load aluminium, used in sheet blocks and halyard leads, supporting line sizes of 6-12mm.
75MM Blocks: Designed for heavy-duty applications, these blocks have a 75mm sheave and support line sizes of 14mm, used in mainsheet systems for catamarans and yachts.
Web Line Blocks: Ranging from 57mm to 125mm in sheave size, these blocks are made from hard anodised aluminium, used in runner blocks and mainsheet applications.
Usage and Features: Blocks are designed for specific marine applications, featuring stainless cheeks, roller bearing systems, and full moulded jackets. Material choices like acetal resin and aluminium enhance performance and durability.
Material Specifications: Acetal resin for construction, glass-filled nylon for cheeks, and 316 stainless steel for axles.
Snatch Blocks Usage: Used for twinning lines, sheet tidy, and continuous furler take-ups.
Pro-Feeder Features: Made of 316 stainless steel with a catch and hinge for easy opening, rolling balls for smooth operation, and designed for real-time racing.
Applications: Include vang cascades, cunningham systems, halyard leads, high static loads, and furler line leads.
Product Specifications: Various part numbers with specific line diameters, shackle pin diameters, breaking loads, safe working loads, and weights. Plain Bearing Blocks and Offshore Blocks are available in different sizes and materials.
Offshore Block Features: Include a Swivel-Stop anti-swivel head option, composite body, and plain bearing system.
Offshore 57mm and 75mm Blocks: Made from CNC aluminium with aluminium cheeks and axles, featuring a roller bearing system.
Maxi Blocks: Feature a stainless body with large lightning holes and a high load bearing system.
Joints for Offshore/Maxi Blocks: Available in perpendicular and parallel configurations for different block sizes.
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Catalog excerpts

Holt Blocks Catalogue-1

TECHNICAL Sheave: Diameter - 20mm Width: 7mm Material: Acetal resin Cheeks: Glass filled nylon with 316 stainless steel straps Axle: 316 stainless steel Line size: .5 - 6mm 2 Cold forged strap, gives rope friendly attachment & greater articulation TECHNICAL Sheave: Diameter - 30mm Width: 10mm Material: Acetal resin Cheeks: Glass filled nylon with 316 stainless steel straps Axle: 316 stainless steel Line size: 5-10mm Strength in critical load area. Allows ropes to be tied directly without becket Optimised rope guides with larger windows to reduce weight and allow easy rinsing DYNAMIC BEARING SYSTEM Strength in critical load area. Allows ropes to be tied directly without becket Mainsheet Systems Back Stay Sytems Control Lines Lead Blocks Vang Cascades Cunningham Systems Stainless ball bearings on stainless axle Control Lines Lead Blocks Vang Cascades Cunningham Systems Halyard Leads Harnessing 20 & 30mm Dynamic Bearing sheaves. The ulitmate in lightweight performance DYNAMIC BEARING SYSTEM Stainless ball bearings on a stainless axle Sheave protection & impact resistance Max Dynamic Load Weight (kg)* (g) Max Dynamic Load Weight (kg)* (g)

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Holt Blocks Catalogue-2

Sheave: Diameter - 20mm Width: 7mm Material: Acetal resin 316 stainless steel straps Axle: 316 stainless steel 2 Line size: .5 - 6mm Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle ORGANIC BEARING SYSTEM Sheave: Diameter - 40mm Material: Acetal resin Cheeks: Glass filled nylon Axle: Aluminium Dyn Axle: 316 Stainless Line size: -12vmm 5 Aluminium large central axle provides a lightweight alternative to the stainless. Aluminium dissipates heat build up giving excellent performance bearing enables high static load applications Control Lines Lead Blocks Vang...

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Holt Blocks Catalogue-3

RATCHET BLOCKS ORGANIC BEARING SYSTEM Aluminium large central axle provides a lightweight alternative to the Dynamic. Aluminium dissipates heat build up giving excellent performance SWIVEL HEAD Sheave: Diameter - 57mm Material: Acetal resin Cheeks: Glass filled nylon Axle: Aluminium Line size: - 12mm 6 Slot Shackle head SHEAVE ACTIVATED RATCHET Ratchet trigger embedded in centre of sheave for optimum performance Advanced carbon composite cheeks, great strength without the expense of weight USAGE Sh eet Block Catamaran Main sh eet Sytems Footb locks Hard anodised CNC’d sheave for ultimate grip...

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Holt Blocks Catalogue-4

28MM TECHNICAL Sheave: Dia - 28mm Material: Acetal Resin / High Load Aluminium Cheeks: 316 Stainless Axle: 316 Stainless 2 8 MM R A N GE Sheet Blocks Halyard Leads Vang / Cunningham sytems Sheave: Dia - 39mm Material: Acetal Resin / High Load Aluminium Cheeks: 316 Stainless Axle: 316 Stainless 3 9 M M RAN GE Sheet Blocks Vang / Cunningham SytemsLead Blocks Alloy Sheave Alloy Sheave Alloy Sheave Alloy Sheave Alloy Sheave Alloy Sheave Alloy Sheave Alloy Sheave Alloy Sheave Part No.‑‑ Sheave Size (mm) Alloy Sheave Break Weight Load (kg) (g) Sheave Max SWL Size (mm) Line (mm) (kg) Alloy Sheave Alloy...

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Holt Blocks Catalogue-5

57MM LINE RATCHET BLOCKS 5 7 MM R A N GE Sheet Blocks Halyard Leads Vang / Cunningham sytems Sheave: Dia - 57mm Material: Acetal Resin / High Load Aluminium Cheeks: 316 Stainless Axle: 316 Stainless 5 7 M M RAT C HE T S Main Sheet Blocks Catamarans - Dinghy - Yachts­ 57MM TECHNICAL Sheave: Dia - 57mm Material: Aluminium Cheeks: 316 Stainless Axle: 316 Stainless Alloy Sheaves Alloy Sheave Alloy Sheave Alloy Sheave Alloy Sheaves

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Holt Blocks Catalogue-6

75MM LINE RATCHET BLOCKS Sheave: Dia - 75mm Material: Acetal Resin / High Load Aluminium Cheeks: 316 Stainless Axle: 316 Stainless 75MM TECHNICAL Sheave: Dia - 75mm Material: Acetal Resin / High Load Aluminium Cheeks: 316 Stainless Axle: 316 Stainless 7 5 M M RAN GE Sheet Blocks Mainsheet Systems: Catamaran - Yachts ­­ Aluminium Sheave Aluminium Sheave Sheave Size Max SWL (mm) Line (mm) (kg)

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Holt Blocks Catalogue-7

STANCHION LEAD BLOCKS WEB TECHNICAL Sheave: Dia - 57-125MM Material: Hard Anodised Aluminium Cheeks: Hard Anodised Aluminium Axle: Hard Anodised Aluminium Sheave: Diameter - 40mm Material: Acetal resin Cheeks: Glass filled nylon Axle: Aluminium Dyn Axle: 316 Stainless Line size: - 10mm 4 sheave protection and impact resistant Designed for standard 25mm stanchions with optimal clamping geometry USAGE Furler line leads Runner Blocks Mainsheet Genoa Lead Mast Foot Blocks Line Dia. Breaking Load (mm) (kg) Safe Working Load Weight (kg) (g) ­­SNATCH  BLOCKS­ SNATCH TECHNICAL Sheave: Diameter - 30/40mm...

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Holt Blocks Catalogue-8

60/80MM ­­PLAIN  BEARING BLOCKS SWIVEL-STOP An anti swivel head moulding is supplied with the block giving the option to have it ‑ fixed head or swivel Mainsheet systems Control Lines Sheet Blocks Vang Cascades Cunningham Systems Halyard Leads High tensile carbon composite body. Strong and lightweight PLAIN BEARING SYSTEM Locking tri-rivet head maintains sheave rotation under higher loads Curved Key Only PLAIN BEARING BLOCKS Line Dia. Shackle Pin (mm) Dia.(mm) Safe Working Load Weight (kg) (g) Sheave Max Break SWL Size (mm) Line (mm) Load (kg) (kg) *SWL based on cleat resistance Line Dia. Shackle...

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Holt Blocks Catalogue-9

OFFSHORE 75MM BLOCKS OFFSHORE 57MM TECH An anti swivel head lcoking screwx - fixed head or swivel Sheave: Diameter - 57mm Material: CNC Aluminium Cheeks: Aluminium Axle: Aluminium Sheave: Diameter - 75mm Material: CNC Aluminium Cheeks: Aluminium Axle: Aluminium Sheet Blocks Line Leads Foot Blocks High tensile teflon coated hard anodised aluminium body. Strong and lightweight ROLLER BEARING SYSTEM CNC machined roller / ball bearing system. Highload versions use Torlon rollers. Break Weight Load (kg) (g)

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Holt Blocks Catalogue-10

Sheave: Diameter - 100/125mm Material: CNC Aluminium Cheeks: Aluminium Axle: Aluminium Sheet Blocks Turning Blocks Halyard Mast Foot Blocks HALYARD / RUNNER BLOCKS HALYARD / RUNNER TECH. ­­­ Sheave: Diameter - 57-125mm Material: CNC Aluminium Cheeks: Aluminium Axle: Aluminium Runners s Halyard Foot Blocks Break Weight Load (kg) (g) OFFSHORE 125MM BLOCKS OF F S H O R E 1 25M M R A NG E­­­­ Sheave Max SWL Size (mm) Line (mm) (kg)

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.