Nano-Lok 6 ft Personal Self-Retracting Lifeline with Anchor Hook, Carabiner and Steel Snap Hook
The Nano-Lok is the SRL that made bulky retractables obsolete: a compact 6 ft web lifeline in a durable thermoplastic housing that connects to an overhead anchor and follows the worker with constant lifeline tension. This 3100520 configuration carries a swiveling anchorage loop with a zinc-plated steel carabiner up top and a self-locking steel snap hook on the lifeline end.
Certified to ANSI/ASSP Z359.14-2021 Class 1 and rated to 420 lb, the Nano-Lok's quick-activating speed sensing brake arrests a fall within inches and achieves required fall clearance as low as 4 ft, roughly half of what a 6 ft shock absorbing lanyard needs. RFID equipped for inspection tracking through 3M Connected Safety ID.
Who Needs This Product
The Nano-Lok 3100520 is built for crews that anchor overhead and want the shortest possible arrest: the carabiner top connector clips to an overhead anchor point or anchorage connector, and the snap hook ties into the harness dorsal D-ring. Constant lifeline tension eliminates the dragging and snag hazards of a lanyard, and the compact housing weighs less than 3 lb. If your crew needs 100 percent tie-off, step up to a twin-leg Nano-Lok; for foot-level anchoring over an edge, use a Nano-Lok Edge Class 2 model instead.
Features
Swiveling Anchorage Loop with Carabiner
The top anchorage loop swivels to keep the housing aligned as the worker moves, and the zinc-plated steel carabiner (0.69 in gate, 3,600 lbf gate strength) clips to overhead anchors fast.
Quick-Activating Brake
The speed sensing brake system engages immediately, arresting a fall within inches and keeping average arrest force at 1,125 lbf.
Self-Locking Snap Hook
The 9502116 zinc-plated steel snap hook (0.75 in gate) closes and locks automatically, with a 3,600 lbf gate rating on the lifeline end.
External Energy Absorber
The high-capacity external energy absorber dissipates fall energy and doubles as an impact indicator that flags an arrested unit at a glance.
Compact and Lightweight
At 2.8 lb with a durable thermoplastic housing, the Nano-Lok rides all day without the bulk of legacy retractables.
RFID Equipped
Built-in RFID works with 3M Connected Safety ID for digital inspection records and fleet inventory management.
Technical Specifications
| SKU | 3100520 |
|---|---|
| Product | Nano-Lok Personal Self-Retracting Lifeline with Anchor Hook |
| Lifeline length | 6 ft (1.8 m) web |
| Top connector | Swiveling anchorage loop with zinc-plated steel carabiner (2000112), 0.69 in gate |
| Lifeline connector | Self-locking zinc-plated steel snap hook (9502116), 0.75 in gate |
| Housing | Nylon thermoplastic |
| Capacity | 420 lb including all clothing, tools, and equipment |
| Average arrest force | 1,125 lbf per ANSI and OSHA (130 lb to 310 lb) |
| Maximum arrest force | 1,800 lbf |
| Unit weight | 2.824 lb (1.281 kg) |
| Service temperature | -40 F to 130 F |
| Mounting | Overhead anchor point, single user |
| Standards | ANSI/ASSP Z359.14-2021 Class 1; OSHA 1910.140; OSHA 1926.502 |
| Warranty | 3M Global Product Warranty against factory defects, one year from first use |
Anchor at or above the D-ring. This is a Class 1 device: it must be anchored at or above the dorsal D-ring with free fall limited to 2 ft, and it is not rated for foot-level tie-off or leading edge exposure. For foot-level anchoring over an edge, use a Nano-Lok Edge Class 2 model. Remove the unit from service immediately after any fall arrest.
Compliance Standards
ANSI/ASSP Z359.14-2021 Class 1
Certified as a Class 1 self-retracting device: anchor at or above the dorsal D-ring, maximum 2 ft free fall. The 2021 standard replaced the legacy Class A and B designations.
OSHA 1926.502 and 1910.140
Meets OSHA personal fall arrest system requirements for construction and general industry with 420 lb capacity and 1,800 lbf maximum arrest force.
Anchorage Strength
Per the user instruction manual, non-certified fall arrest anchorages must sustain 5,000 lbf; certified anchorages require two times maximum arresting force per ANSI/ASSP Z359.2.
Connector Ratings
Both the 2000112 carabiner and 9502116 snap hook carry 3,600 lbf gate strength and 5,000 lbf tensile strength per the manual's connector specification table.
Typical Applications
Setup Overview
- Inspect the housing, lifeline, energy absorber and impact indicator, and both connectors before use.
- Clip the top carabiner to the overhead anchorage or anchorage connector and verify the gate closes and locks.
- Connect the snap hook to the harness dorsal D-ring and verify the gate closes and locks.
- Check retraction: the lifeline should pay out and retract smoothly with constant tension and no hesitation.
- Verify the anchor is at or above the dorsal D-ring and confirm fall clearance per the manual's clearance tables before working.
Full use instructions ship with the unit; the user instruction manual is linked in the documentation section below.
Inspection and Retirement
Inspect the unit before each use, and have a competent person inspect it on a documented schedule per ANSI/ASSP Z359.14 and the manual. Log results in the inspection and maintenance log at the back of the manual or through 3M Connected Safety ID.
- Housing: cracks, distortion, loose fasteners, or a seized swivel eye.
- Lifeline: pay the web out fully and check for cuts, frays, burns, abrasion, and chemical damage.
- Energy absorber and impact indicator: any deployment means immediate removal from service.
- Connectors: gates close and lock at both ends; no cracks, corrosion, or distortion.
- Retraction: the lifeline retracts smoothly under light tension with no hesitation.
Retirement triggers: any fall arrest event, deployed impact indicator, failed retraction or brake check, or any failed inspection.
Fall ProtectionDistributors, LLC Free Tool · No Signup · OSHA 1926.502 Free Interactive Tool Fall Protection Calculator Pick your system. Run the math. Generate a plan. 1Pick Your SystemDetermine fall restraint vs. fall arrest based on your work surface, edge access, and clearance. 2Run the MathCalculate exact fall clearance required below the work surface for your SRL or lanyard setup. 3Generate a PlanGet a printable OSHA-compliant Fall Protection Plan structured around 29 CFR 1926.502(k).
Frequently Asked Questions
DBI-SALA 3100520 Nano-Lok Submittals and Documentation
3100520 User Instruction Manual (PDF)Full Nano-Lok specifications, connector tables, clearance data, and inspection procedures. 3M SRL Service and Repair Bulletin (PDF)3M service, repair, and recertification policy for self-retracting devices. 3100520 SRL Inspection Form (PDF)Printable pass/fail checklist for documented SRL inspections.Compatible and Related Products
- Miller TurboLite+ PFL, Carabiner and Snap Hook. The Miller alternative Class 1 web PFL.
- Guardian CR5 Class 1 Single Leg Web SRL, 6 ft. The Guardian alternative web SRL.
- Malta C7102-G2 6 ft Pygmy Hog Web SRL. The Malta alternative Class 1 web SRL.
Choosing SRL Connectors for Your Crew?
Anchor hardware, lifeline length, and tie-off style decide the right Nano-Lok configuration. Confirm your setup with us and we will make sure the right equipment ships together, based on the delivery location.
Call 863-703-4522 to talk to a fall protection specialist.
3M DBI-SALA Global Product Warranty
Unless otherwise provided by local laws, 3M fall protection products are warranted against factory defects in workmanship and materials for a period of one year from the date of installation or first use by the original owner.
Limited Remedy: Upon written notice to 3M, 3M will repair or replace any product determined by 3M to have a factory defect in workmanship or materials. 3M reserves the right to require product be returned to its facility for evaluation of warranty claims. This warranty does not cover product damage due to wear, abuse, misuse, damage in transit, failure to maintain the product or other damage beyond 3M's control. 3M will be the sole judge of product condition and warranty options. This warranty applies only to the original purchaser and is the only warranty applicable to 3M's fall protection products.
Limitation of Liability: To the extent permitted by local laws, 3M is not liable for any indirect, incidental, special or consequential damages including, but not limited to loss of profits, in any way related to the products regardless of the legal theory asserted.
The warranty above is made in lieu of all warranties or conditions, express or implied, including the implied warranties or conditions of merchantability or fitness for a particular purpose. Please contact 3M's customer service department in your region for assistance with warranty claims, or reach out to our team at Fall Protection Distributors, LLC and we will help you start the process.
