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The SB311 Cargo Marine Snatch Block redefines efficiency in marine cargo handling, providing a critical force-multiplying solution for lifting and towing operations aboard vessels and offshore platforms.
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SB311-24"*25T
SB311 CARGO SNATCH BLOCK
| Model | Weight(kg) | SWL(T) | TL(T) |
| SB311-8"×2.5T | 29 | 2.5 | 10 |
| SB311-10"×3T | 40 | 3 | 12 |
| SB311-12"×5T | 46 | 5 | 20 |
| SB311-14"×6T | 65 | 6 | 24 |
| SB311-14"×8T | 70 | 8 | 32 |
| SB311-16"×8T | 98 | 8 | 32 |
| SB311-16"×10T | 104 | 10 | 40 |
| SB311-16"×15T | 137 | 15 | 60 |
| SB311-18"×15T | 153 | 15 | 60 |
| SB311-18"×20T | 204 | 20 | 80 |
| SB311-20"×25T | 260 | 25 | 100 |
| SB311-24"×50T | 360 | 50 | 150 |
| Item | Description | Qty | Weight |
| 1 | Long Ring | 1 | 29.3 |
| 2 | Beam | 1 | 24 |
| 3 | Spacer | 1 | 0.32 |
| 4 | Round Nut | 1 | 2.4 |
| 5 | Strongback | 1 | 41.34 |
| 6 | Guard plate | 2 | 29.84 |
| 7 | Sheave | 1 | 62 |
| 8 | Shaft | 1 | 11.26 |
| 9 | Connection plate | 2 | 18.62 |
| 10 | Pin | 1 | 3 |
| 11 | Pin shaft | 1 | 2.25 |
| 12 | Hinge plate | 1 | 27.8 |
| 13 | Nut | 1 | 1.16 |
| 14 | Bush | 1 | 1.68 |
| 15 | Connection plate | 1 | 3.1 |
| 16 | Connection plate | 1 | 1.09 |
| 17 | Fixed block | 2 | 0.12 |
| 18 | Nut | 1 | |
| 19 | Pin | 1 | |
| 20 | Pin | 1 | |
| 21 | Zerk | 2 |
As maritime logistics demands faster turnaround times and heavier load capacities, this snatch block combines robust construction with low-friction operation to enhance operational safety and productivity . Engineered to handle safe working loads up to 50 tons (490 kN), the SB311 features a 16-inch diameter pulley with precision bearings, accommodating wire ropes and synthetic slings from 22mm to 32mm in diameter. Its drop-forged steel frame with a quick-release pin design allows rapid rope insertion without threading, making it indispensable for emergency response and routine cargo operations.
The SB311 incorporates a hardened steel sheave with a polished groove finish (Ra 0.8μm) that minimizes rope abrasion and reduces friction loss to less than 3% . The sheave rotates on self-lubricating bronze bushings rated for 10,000+ operation cycles without maintenance, ensuring smooth performance even in saltwater environments. This design maintains rope integrity while maximizing load transfer efficiency.
Manufactured from drop-forged carbon steel (ASTM A668 Grade M) with a tensile strength exceeding 800 MPa, the frame withstands lateral loads up to 125% of SWL . The quick-release side plate features a spring-loaded locking pin with a safety cotter that prevents accidental opening during operation. All load-bearing components undergo magnetic particle inspection to eliminate internal defects.
The entire assembly receives a hot-dip galvanized coating (minimum 85μm thickness) meeting ASTM A153 standards, providing superior corrosion resistance in saltwater environments . Critical components like the axle and bushings are constructed from 316 stainless steel to prevent seizing. The sheave groove includes a wear indicator that becomes visible when 10% of material thickness is lost.
By redirecting the force of a rope or cable, the SB311 effectively doubles the lifting capacity of winch systems while reducing the required operating force by half . This mechanical advantage allows handling heavier loads with existing equipment and reduces operator fatigue during prolonged operations.
The spring-loaded side plate allows rapid insertion and removal of ropes without threading, reducing setup time by up to 70% compared to traditional block designs . This feature is particularly valuable in emergency situations where quick deployment can prevent cargo damage or enhance safety.
The snatch block accommodates both wire ropes (IPS grade 6x37) and high-modulus polyethylene (HMPE) synthetic ropes within the 22-32mm diameter range . The polished sheave groove is specifically engineered to prevent synthetic rope fiber damage while maintaining secure grip during operations.
In addition to the safety cotter on the release pin, the block includes a load indicator pin that extends visibly when 110% of SWL is exceeded, alerting operators to potential overload conditions . The frame design includes handholds positioned to keep fingers clear of pinch points during operation.
The bronze bushings should be inspected quarterly for signs of wear, and the sheave groove cleaned regularly to remove debris . A light application of marine-grade grease is recommended every 500 cycles, or monthly in heavy-use applications. Annual inspection should verify galvanizing integrity and sheave alignment.
SB311 CARGO SNATCH BLOCK
| Model | Weight(kg) | SWL(T) | TL(T) |
| SB311-8"×2.5T | 29 | 2.5 | 10 |
| SB311-10"×3T | 40 | 3 | 12 |
| SB311-12"×5T | 46 | 5 | 20 |
| SB311-14"×6T | 65 | 6 | 24 |
| SB311-14"×8T | 70 | 8 | 32 |
| SB311-16"×8T | 98 | 8 | 32 |
| SB311-16"×10T | 104 | 10 | 40 |
| SB311-16"×15T | 137 | 15 | 60 |
| SB311-18"×15T | 153 | 15 | 60 |
| SB311-18"×20T | 204 | 20 | 80 |
| SB311-20"×25T | 260 | 25 | 100 |
| SB311-24"×50T | 360 | 50 | 150 |
| Item | Description | Qty | Weight |
| 1 | Long Ring | 1 | 29.3 |
| 2 | Beam | 1 | 24 |
| 3 | Spacer | 1 | 0.32 |
| 4 | Round Nut | 1 | 2.4 |
| 5 | Strongback | 1 | 41.34 |
| 6 | Guard plate | 2 | 29.84 |
| 7 | Sheave | 1 | 62 |
| 8 | Shaft | 1 | 11.26 |
| 9 | Connection plate | 2 | 18.62 |
| 10 | Pin | 1 | 3 |
| 11 | Pin shaft | 1 | 2.25 |
| 12 | Hinge plate | 1 | 27.8 |
| 13 | Nut | 1 | 1.16 |
| 14 | Bush | 1 | 1.68 |
| 15 | Connection plate | 1 | 3.1 |
| 16 | Connection plate | 1 | 1.09 |
| 17 | Fixed block | 2 | 0.12 |
| 18 | Nut | 1 | |
| 19 | Pin | 1 | |
| 20 | Pin | 1 | |
| 21 | Zerk | 2 |
As maritime logistics demands faster turnaround times and heavier load capacities, this snatch block combines robust construction with low-friction operation to enhance operational safety and productivity . Engineered to handle safe working loads up to 50 tons (490 kN), the SB311 features a 16-inch diameter pulley with precision bearings, accommodating wire ropes and synthetic slings from 22mm to 32mm in diameter. Its drop-forged steel frame with a quick-release pin design allows rapid rope insertion without threading, making it indispensable for emergency response and routine cargo operations.
The SB311 incorporates a hardened steel sheave with a polished groove finish (Ra 0.8μm) that minimizes rope abrasion and reduces friction loss to less than 3% . The sheave rotates on self-lubricating bronze bushings rated for 10,000+ operation cycles without maintenance, ensuring smooth performance even in saltwater environments. This design maintains rope integrity while maximizing load transfer efficiency.
Manufactured from drop-forged carbon steel (ASTM A668 Grade M) with a tensile strength exceeding 800 MPa, the frame withstands lateral loads up to 125% of SWL . The quick-release side plate features a spring-loaded locking pin with a safety cotter that prevents accidental opening during operation. All load-bearing components undergo magnetic particle inspection to eliminate internal defects.
The entire assembly receives a hot-dip galvanized coating (minimum 85μm thickness) meeting ASTM A153 standards, providing superior corrosion resistance in saltwater environments . Critical components like the axle and bushings are constructed from 316 stainless steel to prevent seizing. The sheave groove includes a wear indicator that becomes visible when 10% of material thickness is lost.
By redirecting the force of a rope or cable, the SB311 effectively doubles the lifting capacity of winch systems while reducing the required operating force by half . This mechanical advantage allows handling heavier loads with existing equipment and reduces operator fatigue during prolonged operations.
The spring-loaded side plate allows rapid insertion and removal of ropes without threading, reducing setup time by up to 70% compared to traditional block designs . This feature is particularly valuable in emergency situations where quick deployment can prevent cargo damage or enhance safety.
The snatch block accommodates both wire ropes (IPS grade 6x37) and high-modulus polyethylene (HMPE) synthetic ropes within the 22-32mm diameter range . The polished sheave groove is specifically engineered to prevent synthetic rope fiber damage while maintaining secure grip during operations.
In addition to the safety cotter on the release pin, the block includes a load indicator pin that extends visibly when 110% of SWL is exceeded, alerting operators to potential overload conditions . The frame design includes handholds positioned to keep fingers clear of pinch points during operation.
The bronze bushings should be inspected quarterly for signs of wear, and the sheave groove cleaned regularly to remove debris . A light application of marine-grade grease is recommended every 500 cycles, or monthly in heavy-use applications. Annual inspection should verify galvanizing integrity and sheave alignment.
