Description
Schaefer Series 7 Stand Up Swivel Block | Boat Supply Store
Engineered for dynamic rigging scenarios, this Schaefer Series 7 block ensures your lines remain optimally positioned without manual intervention. Its integrated stand-up spring actively maintains the block's upright orientation, crucial for preventing line chafing and ensuring smooth sheeting, especially when unloaded. Featuring a 2-3/8" (60 mm) Delrin(tm) sheave and a substantial 1700 lbs (771 kg) Safe Working Load (SWL), this block efficiently handles significant forces, making it ideal for mainsail sheeting or halyard systems on offshore monohulls operating in Gulf Coast conditions.
Key Features
- Self-righting stand-up spring maintains optimal block orientation
- Robust stainless steel base ensures superior load distribution
- Low-friction Delrin(tm) sheave for peak performance and durability
- High-strength ball bearing system minimizes friction under load
- Durable construction suitable for rigorous marine environments
- Efficient operation for mainsail, jib, or spinnaker control
- Reliable performance in demanding sailing applications
- Versatile mounting options with 1/4" RH fastener compatibility
Specifications
| Product Specifications | |
|---|---|
| Sheave Diameter | 2-3/8" (60 mm) |
| Max Line Diameter | 1/2" (13 mm) |
| Overall Diameter (with base) | 3-3/8" (86 mm) |
| Height | 4-25/32" (120 mm) |
| H2 | 2-15/32" (63 mm) |
| Fastener Size | 1/4" RH (6 mm) |
| C/C | 1-11/16" (43 mm) |
| Safe Working Load (SWL) | 1700 lbs (771 kg) |
| Weight (Aluminum) | 11.7 oz (332 g) |
Who This Is For
Sailors and boaters requiring a robust, self-righting block for critical rigging tasks where maintaining proper line orientation is paramount. This block is especially beneficial for those managing complex systems that demand consistent, low-friction performance under high loads.
How It Compares
| Feature | Schaefer Series 7 Stand Up Swivel Block | Composite |
|---|---|---|
| Sheave Diameter | 2-3/8" (60 mm) | — |
| Max Line Diameter | 1/2" (13 mm) | — |
| Safe Working Load (SWL) | 1700 lbs (771 kg) | — |
| Stand Up Spring | Yes | No |
| Sheave Material | Delrin(tm) | Carbo |
Common Concerns Answered
Is the price point justified for this block?
The Schaefer Series 7 block's construction, featuring a robust stainless steel base, a low-friction Delrin(tm) sheave, and a self-righting spring mechanism, distinguishes it from basic blocks. These premium components and integrated functionality provide enhanced durability and operational efficiency, justifying the investment for demanding applications.
Do I need additional components for installation?
While this block can be mounted directly, certain installations may benefit from or require a 97-49 backing plate (sold separately) for optimal load distribution and secure mounting. This ensures the substantial 1700 lbs SWL is effectively managed and the hull integrity is maintained.
Why is the stand-up spring a significant feature?
The stand-up spring is a critical functional element that ensures the block remains oriented upright when not under load. This prevents chafe against the deck or other rigging components and facilitates easier line engagement, a significant advantage in dynamic sailing scenarios.
Frequently Asked Questions
What is the working load limit (SWL) of the Schaefer Series 7 Stand Up Ball Bearing Swivel Block?
The Safe Working Load (SWL) for the Schaefer Series 7 Stand Up Ball Bearing Swivel Block is 1700 lbs (771 kg).
What is the maximum line diameter this block can accommodate?
This block is designed to accommodate a maximum line diameter of 1/2" (13 mm).
What are the overall dimensions of the Schaefer Series 7 Stand Up Ball Bearing Swivel Block?
The overall dimensions are: Sheave Diameter 2-3/8" (60 mm), Max Line Diameter 1/2" (13 mm), Overall Diameter (with base) 3-3/8" (86 mm), and Height 4-25/32" (120 mm).
What material is the sheave made of?
The sheave is constructed from Delrin(tm) for low-friction and high-strength performance.
What is the purpose of the stand-up spring?
The stand-up spring's purpose is to automatically keep the block upright when it is not under load, preventing it from flopping over and potentially causing chafe or interference with the rigging.
