Kevlar® & Nylon Recovery Strops
Black Snake Kevlar® & Nylon Recovery Strops
The Black Snake product range began in 2002 with our unique Nylon 4WD “snatch-um” strop and has expanded rapidly into a wide variety of vehicle recovery, towing and specialty products.
Our premier range features Kevlar® recovery strops capable of towing and recovering the largest mine-site vehicles, short Kevlar® underground mining specialty products and specially designed military strops.
The Nylon range suits kinetic recovery and towing of small to medium sized vehicles.
With over 150 different products available and in excess of 30,000 units supplied to various markets worldwide, the Black Snake Kevlar® and Nylon range have proven themselves hardworking, durable and efficient. Black Snake have successfully carved a unique niche in the mining, construction and military industries.
Black Snake Kevlar® Recovery & Towing Strops
Black Snake Nylon Recovery & Towing Strops
Determine the Forces Involved
Black Snake Guide to vehicle recovery
Vehicle recovery and towing involve forces which are often difficult to quantify and are dynamic. We provide a Vehicle Recovery Chart on the following pages to assist in choosing strop size and connectors together with estimated maximum vehicle weights for different bogged scenarios. Below is a series of examples.
Flipped, Not Bogged:
This photo shows recovery of an upturned vehicle which requires very slow uptake of load on the strops and no sudden jerking or high acceleration by the recovery vehicles.
LIGHT/MEDIUM BOGGED:
This photo shows the regular movement of a skid mounted transfer conveyor by 3 bulldozers. Soft, uphill slopes and skid-mounting make for slow, careful recovery. In this case, the lead bulldozer has the longest strop, second bulldozer keeps an eye on the leader and a third bulldozer pushes the equipment. Careful co-ordination and good procedures ensure longevity of recovery equipment and efficient moves.
LIGHT/MEDIUM to SEVERELY BOGGED:
The combination of uphill slope, creating high opposing vehicle force due to gravity, rolling resistance and boggy conditions require conservative estimates of overall static and dynamic forces involved for this recovery. Bulldozers have much better traction in slippery conditions than wheeled vehicles. A slow, constant steady pull is paramount to the success of high load/force recoveries, not a jerking action (uneven acceleration or worse, kinetic snatch type action).
BEYOND MASSIVELY BOGGED:
Conservative calculations are sometimes required when judging the chance of a successful recovery. Knowing the weight of a vehicle is sometimes not enough. A much higher estimate of forces is required. This excavator is stuck fast and recovery resembles more of a lift which requires much higher safety factors to be considered. Take into account the chance of very serious damage to the severely bogged vehicle chassis and tracks/wheels before attempting some recoveries.
Black Snake Vehicle Recovery ChartKEVLAR®
Black Snake Guide for Kevlar® Strops 10t to 30t
| KEVLAR® RECOVERY STROP | 10t | 20t | 30t | 30t |
|---|---|---|---|---|
| Min Break Strength¹ | Min Break Strength¹ | Min Break Strength¹ | Non Standard thimbles on request | |
| Using 2:1 Safety Factor Max force applied on recovery strop Recovery Load Limit Tonne (force) | 5t (49kN) | 10t (98kN) | 15t (147kN) | 15t (147kN) |
| Recover light/medium bogged vehicle Assume resistance 50% of Vehicle Weight | 10t vehicle | 20t | 30t | 30t |
| Recover a severely bogged vehicle Assume resistance 75% of Vehicle Weight | 6t | 13t | 20t | 20t |
| Recover a massively bogged vehicle Assume resistance 120% of Vehicle Weight | 4t | 8t | 12t vehicle | 12t |
| Grade ‘S’ shackle BODY fits through strop MBS (shackle) > MBS (recovery strop) | 4.7 - 8.5 tonne MBS>20t | 6.5 - 12 tonne MBS>30t | 6.5 tonne MBS>30t | 8.5-17 tonne MBS>40t |
| Grade ‘S’ shackle PIN fits through strop MBS (shackle) > MBS (recovery strop) | 4.7 - 8.5 tonne MBS>20t | 6.5 - 12 tonne MBS>30t | 6.5 - 17 tonne MBS>30t | 8.5 - 17 tonne MBS>40t |
| SUPER shackles BODY fits through strop MBS (shackle) > MBS (recovery strop) | 7 - 12.5 tonne MBS>30t | 9.5 - 18 tonne MBS>40t | 9.5 tonne MBS>40t | 12.5 - 30 tonne MBS>50t |
| SUPER shackle PIN fits though strop MBS (shackle) > MBS (recovery strop) | 7 - 12.5 tonne MBS>30t | 9.5 - 18 tonne MBS>40t | 9.5 - 30 tonne MBS>50t | 12.5 - 30 tonne MBS>50t |
| Coupling link 13mm - 16mm MBS>20t | Coupling link 18/20mm MBS>50t | Coupling link 18/20mm MBS>50t | Coupling link 18/20mm MBS>50t | Coupling link 22mm MBS>60t |
Black Snake Guide for Kevlar® Strops 50t to 70t
| KEVLAR® RECOVERY STROP | 50t | 50t | 70t | 70t |
|---|---|---|---|---|
| Min Break Strength¹ | Non Standard thimbles on request | Min Break Strength¹ | Non Standard Oversize Eyes on request | |
| Using 2:1 Safety Factor Max force applied on recovery strop Recovery Load Limit Tonne (force) | 25t (245kN) | 25t (245kN) | 35t (343kN) | 35t (343kN) |
| Recover light/medium bogged vehicle Assume resistance 50% of Vehicle Weight | 50t vehicle | 50t | 70t | 70t |
| Recover a severely bogged vehicle Assume resistance 75% of Vehicle Weight | 33t | 33t vehicle | 46t | 46t |
| Recover a massively bogged vehicle Assume resistance 120% of Vehicle Weight | 21t | 21t | 29t vehicle | 29t |
| Grade ‘S’ shackle BODY fits through strop MBS (shackle) > MBS (recovery strop) | N/A | 12 - 25 tonne MBS>60t | N/A | 13.5 - 17tonne MBS>80t |
| Grade ‘S’ shackle PIN fits through strop MBS (shackle) > MBS (recovery strop) | 12 - 25 tonne MBS>60t | 12 - 25 tonne MBS>60t | 17 - 35 tonne MBS>90t | 17 - 35 tonne MBS>90t |
| SUPER shackles BODY fits through strop MBS (shackle) > MBS (recovery strop) | N/A | 18 - 30 tonne MBS>80t | N/A | 21 - 30 tonne MBS>90t |
| SUPER shackle PIN fits though strop MBS (shackle) > MBS (recovery strop) | 18 - 40 tonne MBS>80t | 18 - 30 tonne MBS>80t | 21 - 40 tonne MBS>90t | 21 - 40 tonne MBS>90t |
| Use Coupling links MBS (coupling links) > MBS (recovery strop) | Coupling link 22mm MBS>60t | Coupling link 22mm MBS>60t | Coupling link 26mm MBS>80t | Coupling link 26mm MBS>80t |
Black Snake Guide for Kevlar® Strops 100t to 150t
| KEVLAR® RECOVERY STROP | 100t | 100t | 150t | 150t |
|---|---|---|---|---|
| Min Break Strength¹ | Non Standard Oversize Eyes on request | Min Break Strength¹ | Non Standard Oversize Eyes on request | |
| Using 2:1 Safety Factor Max force applied on recovery strop Recovery Load Limit Tonne (force) | 50t (490kN) | 50t (490kN) | 75t (735kN) | 75t (735kN) |
| Recover light/medium bogged vehicle Assume resistance 50% of Vehicle Weight | 100t | 100t | 150t vehicle | 150t |
| Recover a severely bogged vehicle Assume resistance 75% of Vehicle Weight | 67t | 67t | 100t | 100t vehicle |
| Recover a massively bogged vehicle Assume resistance 120% of Vehicle Weight | 42t | 42t | 62t | 62t |
| Grade ‘S’ shackle BODY fits through strop MBS (shackle) > MBS (recovery strop) | 17 tonne MBS=100t Not recommended | 25 tonne MBS>140t | N/A | 25 tonne Not Recommended MBS=150t |
| Grade ‘S’ shackle PIN fits through strop MBS (shackle) > MBS (recovery strop) | 25 - 55 tonne MBS>140t | 25 - 55 tonne MBS>140t | 35 - 55 tonne MBS>180t | 35 - 55 tonne MBS>180t |
| SUPER shackles BODY fits through strop MBS (shackle) > MBS (recovery strop) | 30 tonne MBS>120t | 40 tonne MBS>160t | N/A | 40 tonne MBS>190t |
| SUPER shackle PIN fits though strop MBS (shackle) > MBS (recovery strop) | 40 - 85 tonne MBS>160t | 40 - 85 tonne MBS>160t | 40 - 85 tonne MBS>190t | 40 - 85 tonne MBS>190t |
| Use Coupling links MBS (coupling links) > MBS (recovery strop) | Coupling link 32mm MBS>120t | Coupling link 32mm MBS>120t | N/A | N/A |
Black Snake Guide for Kevlar® Strops 200t to 400t
| KEVLAR® RECOVERY STROP | 200t | 300t | 400t |
|---|---|---|---|
| Min Break Strength¹ | Min Break Strength¹ | Min Break Strength¹ | |
| Using 2:1 Safety Factor Max force applied on recovery strop Recovery Load Limit Tonne (force) | 100t (980kN) | 150t (1470kN) | 200t (1962kN) |
| Recover light/medium bogged vehicle Assume resistance 50% of Vehicle Weight | 200t | 300t | 400t |
| Recover a severely bogged vehicle Assume resistance 75% of Vehicle Weight | 130t | 200t | 267t |
| Recover a massively bogged vehicle Assume resistance 120% of Vehicle Weight | 84t vehicle | 125t | 166t |
| Grade ‘S’ shackle BODY fits through strop MBS (shackle) > MBS (recovery strop) | N/A | N/A | N/A |
| Grade ‘S’ shackle PIN fits through strop MBS (shackle) > MBS (recovery strop) | 42- 55 tonne MBS>240t | 55 – 85 tonne MBS>320t | 85 tonne MBS>460t |
| SUPER shackles BODY fits through strop MBS (shackle) > MBS (recovery strop) | N/A | N/A | N/A |
| SUPER shackle PIN fits though strop MBS (shackle) > MBS (recovery strop) | 55-85 tonne MBS>260t | 85 -120 tonne MBS>380t | 120 tonne MBS>500t |
Black Snake Vehicle Recovery ChartNYLON
Black Snake Guide for Nylon Strops 8t to 30t
| NYLON RECOVERY STROP | 8t | 12t | 20t | 30t |
|---|---|---|---|---|
| Min Break Strength¹ | Min Break Strength¹ | Min Break Strength¹ | Min Break Strength¹ | |
| Using 2:1 Safety Factor Max force applied on recovery strop Recovery Load Limit Tonne (force) | 4t (39kN) | 6t (59kN) | 10t (98kN) | 15t (147kN) |
| Recover light/medium bogged vehicle Assume resistance 50% of Vehicle Weight | 8t vehicle | 12t | 20t | 30t |
| Recover a severely bogged vehicle Assume resistance 75% of Vehicle Weight | 5t | 8t vehicle | 13t | 20t |
| Recover a totally bogged vehicle Assume resistance 120% of Vehicle Weight | 3t | 5t | 8t vehicle | 12t |
| S Grade shackle BODY fits with MBS (shackle)> MBS (recovery strop) | 3.25 - 6.5 tonne MBS>12t | 4.7 - 8.5 tonne MBS>20t | 6.5 - 12 tonne MBS>30t | 8.5 - 17 tonne MBS>40t |
| S Grade shackle PIN fits with MBS (shackle)> MBS (recovery strop) | 3.25 - 6.5 tonne MBS>12t | 6.5 - 8.5 tonne MBS>20t | 6.5 - 12 tonne MBS>30t | 8.5 - 17 tonne MBS>40t |
| Use SUPER shackle BODY with MBS (shackle)> MBS (recovery strop) | 5 - 9.5tonne MBS>20t | 7 - 12.5 tonne MBS>30t | 9.5 - 15 tonne MBS>40t | 12.5 - 18 tonne MBS>50t |
| Use SUPER shackle PIN with MBS (shackle)> MBS (recovery strop) | 5 - 9.5tonne MBS>20t | 9.5 - 12.5 tonne MBS>30t | 9.5 - 15 tonne MBS>40t | 12.5 - 18 tonne MBS>50 |
| Use Couplers with MBS (couplers)> MBS (recovery strop) | Coupling link 13mm MBS>20t | Coupling link 13-16mm MBS>20t | Coupling link 16mm MBS>30t | Coupling link 18/20mm MBS>50t |
Black Snake Guide for Nylon Strops 50t to 100t
| NYLON RECOVERY STROP | 50t | 70t | 100t |
|---|---|---|---|
| Min Break Strength¹ | Min Break Strength¹ | Min Break Strength¹ | |
| Using 2:1 Safety Factor Max force applied on recovery strop Recovery Load Limit Tonne (force) | 25t (245kN) | 35t (343kN) | 50t (490kN) |
| Recover light/medium bogged vehicle Assume resistance 50% of Vehicle Weight | 50t vehicle | 70t | 100t |
| Recover a severely bogged vehicle Assume resistance 75% of Vehicle Weight | 33t | 46t vehicle | 67t |
| Recover a totally bogged vehicle Assume resistance 120% of Vehicle Weight | 21t | 29t | 42t vehicle |
| S Grade shackle BODY fits with MBS (shackle)> MBS (recovery strop) | 12 - 25 tonne MBS>60t | 25 - 35 tonne MBS>120t | 25 - 55 tonne MBS>120t |
| S Grade shackle PIN fits with MBS (shackle)> MBS (recovery strop) | 12 - 35 tonne MBS>60t | 25 - 35 tonne MBS>120t | 25 - 55 tonne MBS>120t |
| Use SUPER shackle BODY with MBS (shackle)> MBS (recovery strop) | 18 - 40 tonne MBS>80t | 40 - 55 tonne MBS>150t | 40 - 55 tonne MBS>150t |
| Use SUPER shackle PIN with MBS (shackle)> MBS (recovery strop) | 18 - 40 tonne MBS>80t | 40 - 55 tonne MBS>150t | 40 - 55 tonne MBS>150t |
| Use Couplers with MBS (couplers)> MBS (recovery strop) | Coupling link 26mm MBS>70t | Coupling link 32mm MBS>110t | Coupling link 32mm MBS>110t |