A single block has only one sheave. Models differ in size, sturdiness, attachment and bearing systems.
Such blocks can be used in two-line block and tackle, as an intermediary pulley in multi-block tackle or as a line lead block.
Each of the many different attachment systems is appropriate for a particular type of block. There are two main bearing configurations. In blocks with mechanical or plastic ball bearings, two sets of bearings support the load in races on either side of the sheave.
Roller bearings sit in pairs between the races within the sheave. While sometimes found in small blocks, they are more often used in large-diameter models, as they can support higher loads and wear more slowly.
Line diameter and working load will be the main choice criteria. Manufacturers include detailed technical information in their catalogs.
 |
 |
Sailboat single block with swivel / becket (max. rope ø : 12 mm) 74106 Wichard
Commentary Complete range of ball bearing blocks Modern design Innovative design with two lateral races of ball bearings Smooth running for low load adnhigh speed action...
 |
 |
Single flat cheek block for sailboats (max. rope ø : 6 mm) PBB 60 - SWL = 1500 KG Seldén
HIGH LOAD PBB These blocks are optimised for wires or Dyneema®/Spectra® core. TECHNICAL FEATURES Stainless steel, electro polished...
 |
 |
Sailboat single lashing block (max. rope ø : 14 mm) 2 T | KB14 Karver Systems
SIMPLICITY AND DESIGN Simple, reliable and efficient - the Karver KB block combines both freedom of attachment and extreme safety LIGHT WEIGHT Compared to traditional blocks (at equal working...
 |
 |
Single wire-block with swivel for sailboats (max. wire ø : 10 mm) 01479-25 Eval
STAINLESS STEEL BLOCKS WITH SINGLE WHEEL AND SWIVEL Code 1479-25 , Dimensions...
 |
  |
Sailboat single block with swivel (max. rope ø : 16 mm) 3246 Harken
Sheave Ø (mm)100 mm Sheave Ø (in)3...
 |
 |
Sailboat single block with dyneema® fixed head (max. rope ø : 10 mm) RF56101- M.W.L - 250 kg Ronstan
Automatic and Manual ratchet in one block Up...
 |
 |
Sailing dinghy single block with swivel (max. line ø : 6 mm) HT 92510 - BL = 350 kg Holt
STAINLESS CHEEKS Large window to reduce weight and allow easy rinsing ROLLER BEARING SYSTEM Delrin needle...
 |
 |
Sailboat halyard lift single block OFFSHORE Bainbridge international
Designed for offshore applications including Volvo, BT Global Challenge and performance...
 |
 |
Sailboat single block for stanchion WL/2 Spinlock
Compact Stanchoin Lead System Features and Benefits - Safe, compact design - Reduces furling line friction -...
 |
 |
Sailing dinghy thru-deck single block A..16B Allen Brothers
A..16B Sheave Boxes Low profile S/S ball bearing and sheave Allen sheave boxes are available with either plain or ball bearings, a choice of...
 |
 |
Sailboat single block with swivel 60 - SWL = 800 KG Antal
New by Antal the One Piece Frame block, the block without pins or screws, it is a light and strong solution: simply a hard black anodized and...
 |
 |
Sailboat stainless steel single block Rondal
Elegantly designed, and constructed from high-gloss stainless steel 316 with black anodised and Teflon-sealed sheaves, Rondal blocks combine elegance and efficiency with...
 |
 |
Sailboat single block with becket 19.78 Sea Sure
ingle Ball Race Block with becket,19mm 19mm carbon fibre cheeked ball race blocks . Light weight, high load carrying capacity blocks . Reliable race proven designs . High wear resistant cheek material extends...
 |
 |
Advantages: • easily running Delrin ball bearing in the outer collar • red point in enhancing strap of stainless steel •...
 |
 |
Single flat cheek block with jamming cam for sailboats (max. rope ø : 16 mm) 82999 Barton Marine
High Load Blocks manufactured from marine grade aluminium and 'Spectro' grey anodised for high UV stability and durability. Sheaves are precision urned from...
 |
 |
Sailboat single snatch-block Equiplite Europe
Equiplite™ Snatch Blocks use DSK 75 ULTRA loops to take the loads directly through the centre of the sheave....
 |
 |
Sailboat high load single block Petersen Stainless
Benefits The Hi-MOD Marine Blocks are a simple and durable cruising block which work well under heavy loads...
 |
 |
Sailboat single lashing snatch-block (max. rope ø : 10 mm) ATN
The only Snatch block with no moving...
 |
 |
Sailboat single block with swivel (carbon) BL = 3600 -> 8000 KG OH MARINE EQUIPMENT
Our Carbon Blocks are produced with emphasis on...
