Description
Schaefer 51mm Single Aluminum Block | Boat Supply Store
For precise control in demanding marine environments, this Schaefer single block ensures efficient line management. Its anodized aluminum cheeks provide exceptional durability, while the low-friction 51mm Delrin™ sheave guarantees smooth operation under load, rated up to 1750 lbs (795kg). The innovative lockable swivel head prevents unwanted twisting, making it ideal for complex control lines on offshore sailboats or performance dinghies navigating the Gulf Coast.
Key Features
- Durable anodized aluminum cheeks resist corrosion
- Smooth Delrin™ sheave minimizes friction and wear
- Lockable swivel head prevents line twist and ensures proper lead
- High 1750 lb SWL for robust load-bearing capacity
- Compact 24mm sheave thickness for efficient space utilization
- Accommodates lines up to 11mm (7/16") diameter
- Lightweight 142g (5oz) design reduces system weight
- Reliable Schaefer Marine engineering for longevity
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 51mm (2") |
| Thickness | 24mm (15/16") |
| Width | 54mm (2 1/8") |
| Length | 112mm (4 13/32") |
| SWL | 1750 lbs (795kg) |
| Weight | 142g (5oz) |
| Max Line Size | 11mm (7/16") |
| Cheek Material | Anodized Aluminum |
| Sheave Material | Delrin™ |
Who This Is For
Sailors and boaters requiring a dependable, high-strength single block for critical rigging tasks. Ideal for those who need the added security of a lockable swivel head to maintain precise line angles.
How It Compares
| Feature | Schaefer 51mm Single Aluminum Block | Harken Single Block |
|---|---|---|
| Sheave Diameter | 51mm | — |
| SWL | 1750 lbs | — |
| Cheek Material | Anodized Aluminum | Aluminum, Nylon |
| Lockable Swivel Head | Yes | Varies by model, Varies by model |
Common Concerns Answered
Will the 51mm sheave diameter be sufficient for my large diameter lines?
While the 51mm sheave is optimized for a wide range of standard sailing lines up to 11mm (7/16"), users with exceptionally large diameter lines may find larger sheave options more suitable. This block's strengths lie in its durability and lockable swivel.
Are there issues with the swivel head locking mechanism?
The Schaefer single block features a lockable swivel head designed for reliable performance, addressing potential inconsistencies found in some competitor models, ensuring your rigging stays positively set.
Is the price point justified for this block?
The investment in this Schaefer block is supported by its robust anodized aluminum construction, smooth Delrin™ sheave, and the functional lockable swivel head, offering superior longevity and performance in harsh marine conditions compared to less expensive alternatives.
Frequently Asked Questions
What is the maximum line size this Schaefer single block can accommodate?
This Schaefer single block is designed to accommodate lines with a maximum diameter of 11mm (7/16").
What is the safe working load for the Schaefer 51mm single aluminum block?
The safe working load (SWL) for this Schaefer single aluminum block is rated at 1750 lbs (795kg).
Can the swivel head on this block be locked?
Yes, the swivel head on this Schaefer single aluminum block is lockable, allowing you to secure it in a desired orientation and prevent unwanted twisting of the line.
What are the dimensions of the Schaefer 51mm single aluminum block?
The dimensions are: Sheave Diameter: 51mm (2"), Thickness: 24mm (15/16"), Width: 54mm (2 1/8"), and Length: 112mm (4 13/32").
What material is the sheave made of in this Schaefer block?
The sheave in this Schaefer block is constructed from high-performance Delrin™ for exceptional low-friction operation and durability.
