Description
Schaefer Single Ball Bearing Block - Swivel Lock | Boat Supply Store
For sailors and boaters requiring precise control over line direction, this single ball bearing block offers a robust solution. It features durable aluminum cheeks for structural integrity and a low-friction Delrin™ sheave capable of handling lines up to 7/16" (11mm) with a substantial working load limit of 1500 lbs (680kg). The integral lockable swivel head allows the block's orientation to be fixed, preventing unwanted rotation in complex rigging setups, a critical advantage when running halyards or control lines on vessels operating in challenging Gulf Coast waters.
Key Features
- Engineered for efficiency with a low-friction Delrin™ ball bearing sheave.
- Durable construction featuring robust aluminum cheeks.
- Offers versatile rigging with a lockable swivel head to prevent unwanted twist.
- Rated for a high working load limit of 1500 lbs (680kg) for demanding applications.
- Accommodates lines up to 7/16" (11mm) diameter.
- Compact dimensions: 2 1/8" width, 4 13/32" length, and 15/16" thickness.
- Lightweight at only 5oz (142g), minimizing system weight.
- Precisely manufactured by Schaefer Marine for reliable performance.
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 2" (51mm) |
| Thickness | 15/16" (24mm) |
| Width | 2 1/8" (54mm) |
| Length | 4 13/32" (112mm) |
| SWL | 1500 lbs. (680kg) |
| Weight | 5oz. (142g) |
| Max Line | 7/16" (11mm) |
Who This Is For
Sailors and boaters requiring a reliable, low-friction single block for various rigging applications, particularly those needing a swivel head that can be secured to prevent unwanted rotation.
How It Compares
| Feature | Schaefer Single Ball Bearing Block - Swivel Lock | Competitor |
|---|---|---|
| Sheave Diameter | 2" (51mm) | — |
| Working Load Limit (SWL) | 1500 lbs (680kg) | — |
| Lockable Swivel Head | Yes | No; No |
| Sheave Material | Delrin™ | Carbo™ polymer; Nylon |
| Cheek Material | Aluminum | Nylon; Nylon |
| Max Line Size | 7/16" (11mm) | 5/16" (8mm); 7/16" |
Common Concerns Answered
Is this block worth the higher price point?
While the initial investment for the Schaefer 506-05 may be higher than basic, non-swiveling alternatives, its robust aluminum construction, low-friction Delrin™ sheave, and the highly functional lockable swivel head offer superior durability and performance, justifying the cost for demanding sailing applications.
Is the swivel mechanism difficult to engage?
Some users have commented that the swivel mechanism requires a firm push to lock or unlock. This can be attributed to the precise engineering ensuring a secure lock when engaged, which is crucial for maintaining rigging integrity under load.
How does the price compare to other single blocks?
The Schaefer 506-05 is positioned at a higher price point than entry-level blocks, reflecting its advanced features like the lockable swivel head and premium materials. However, its competitive advantages in durability and functionality, especially when compared to basic models, represent a sound investment for critical rigging.
Frequently Asked Questions
What is the maximum line size this Schaefer block can accommodate?
The Schaefer 506-05 block is designed to accommodate lines with a maximum diameter of 7/16" (11mm).
What is the working load limit (SWL) for the Schaefer 506-05 block?
The working load limit (SWL) for the Schaefer 506-05 block is rated at 1500 lbs (680kg).
Can the swivel head on this Schaefer block be locked?
Yes, the swivel head on the Schaefer 506-05 block features a lockable position to prevent unwanted rotation.
What material is the sheave made of in the Schaefer 506-05 block?
The sheave in the Schaefer 506-05 block is constructed from Delrin™, a high-performance acetal resin known for its low-friction characteristics.
What are the dimensions of the Schaefer Single Ball Bearing Block (506-05)?
The Schaefer 506-05 block measures 2" (51mm) in sheave diameter, 15/16" (24mm) in thickness, 2 1/8" (54mm) in width, and 4 13/32" (112mm) in length.
