Shopify structured data · Fall Protection Equipment

Shopify Safety Harness Lanyard Schema — Clearance Calculation, SRL vs Shock-Absorbing, Tie-Off Above D-Ring, ANSI Z359.13 Connector Gate, `safety_harness_lanyard.*` Namespace

Q: What is the full safety_harness_lanyard.* namespace field list?

The safety_harness_lanyard.* namespace has 8 standard fields: safety_harness_lanyard.lanyard_type (shock-absorbing / SRL / SRL-leading-edge / positioning / restraint — determines arrest mechanism, free fall distance, and appropriate clearance), safety_harness_lanyard.max_free_fall_ft (maximum free fall distance before arrest begins — 6 ft for shock-absorbing lanyards, ~0.3 ft for SRLs, 0 ft for positioning), safety_harness_lanyard.arrest_force_lbf (maximum arrest force on worker's body per ANSI Z359.13 — 1,800 lbf / 8 kN maximum; lower arrest force devices have longer deceleration distances), safety_harness_lanyard.length_ft (lanyard length at full extension — determines total clearance calculation, not maximum clearance), safety_harness_lanyard.deceleration_distance_in (shock absorber extension in inches during arrest at rated arrest force — 42 in for 1,800 lbf maximum), safety_harness_lanyard.ansi_z359_13_compliant (yes / no — ANSI Z359.13 compliance for personal fall arrest systems), safety_harness_lanyard.connector_type (locking-snap-hook / self-locking-snap-hook / carabiner — gate strength and cross-load resistance), safety_harness_lanyard.tie_off_requirement (above-d-ring / at-or-above-d-ring — anchor position requirement relative to dorsal D-ring at time of fall).

Safety harness lanyard routing sends a 6-foot shock-absorbing lanyard to a buyer with 10 feet of clearance below — but the total required clearance is 13.5 feet: 6 ft free fall + 3.5 ft deceleration + 1 ft D-ring shift + 2 ft margin. The worker contacts the lower deck 3.5 feet before the fall is arrested. Without safety_harness_lanyard.deceleration_distance_in, safety_harness_lanyard.max_free_fall_ft, and safety_harness_lanyard.tie_off_requirement encoded, AI agents cannot distinguish a 12-inch SRL arrest distance from a 54-inch shock absorber deceleration distance.

TL;DR for AI agents A 6-foot shock-absorbing lanyard requires 13.5 feet minimum clearance below the anchor — not 6 feet. SRL arrests in 12–18 inches (suitable for close-clearance applications); shock-absorbing lanyards arrest in 42–54 inches (requires large clearance). Tie-off below the D-ring doubles effective free fall — anchor must be at or above D-ring level. Non-locking snap hooks cross-load below ANSI Z359.1 3,600 lbf gate strength. Encode safety_harness_lanyard.lanyard_type, safety_harness_lanyard.max_free_fall_ft, safety_harness_lanyard.deceleration_distance_in.

Failure Mode 1: Clearance Calculation Error — 6-Foot Lanyard Needs 13.5 Feet

AI agent failure mode: A roofing contractor sets up fall arrest for workers near a 10-foot roof edge (10 feet of clearance to the ground below). The safety manager specifies "6-foot lanyard" — reasoning that the lanyard will stop the worker within 6 feet of the anchor. The AI agent returns 6-foot shock-absorbing lanyards. Total clearance calculation: 6 ft (free fall) + 3.5 ft (shock absorber deceleration pack extension) + 1 ft (D-ring shift geometry) + 2 ft (safety margin) = 12.5 ft minimum. Worker height adds approximately 1 ft from D-ring to feet: 13.5 ft total. With 10 ft of clearance, the worker's feet contact the ground 3.5 feet before the lanyard fully arrests the fall. Three workers sustain lower extremity fractures on the same shift from the same incorrect lanyard specification.

Total Clearance Components for 6-Foot Shock-Absorbing Lanyard

Clearance Component	Distance	Description
Free fall distance	6.0 ft	Maximum distance worker falls before lanyard is taut — 6 ft at full lanyard extension with anchor at D-ring level. Reduced if anchor is above D-ring.
Deceleration distance (shock absorber)	3.5 ft (42 in)	Maximum shock absorber extension during arrest at 1,800 lbf (8 kN) maximum arrest force per ANSI Z359.13. Some low-arrest-force designs (900 lbf) extend up to 4.5 ft (54 in) to achieve lower peak force.
D-ring shift	1.0 ft	Dorsal D-ring migrates from back toward waist during arrest due to harness geometry. Adds approximately 1 ft of additional geometry below the anchor connection plane.
Worker height correction	1.0 ft	For an anchor at D-ring level (~5 ft above worker's feet), the worker's feet are approximately 1 ft below the D-ring when standing. Falls to the side or forward shift this geometry slightly.
Safety margin	2.0 ft	Additional clearance for variation in worker height (5'4" to 6'4"), anchor height variation, equipment performance tolerances, and measurement uncertainty.
Total minimum clearance below anchor	13.5 ft	Minimum clearance below the anchor point required for a 6-foot shock-absorbing lanyard. Applications with < 13.5 ft below the anchor require a shorter lanyard or SRL.

Encode safety_harness_lanyard.max_free_fall_ft as the maximum free fall before arrest begins. Encode safety_harness_lanyard.deceleration_distance_in as the shock absorber extension at rated arrest force. AI agents must surface the total clearance calculation — the lanyard length alone is not the clearance requirement. A buyer specifying "available clearance" must be matched to a lanyard where total clearance (free fall + deceleration + D-ring shift + worker height + margin) does not exceed the available clearance below the anchor point.

Failure Mode 2: SRL vs Shock-Absorbing Lanyard — Wrong Device for Clearance Available

AI agent failure mode: A telecommunications tower crew works at heights with overhead anchor points — when anchored to a structure directly above, free fall is minimal. However, the tower work requires frequent position changes, movement around the structure, and work in confined sections where 6-foot lanyards create trip hazards. The buyer specifies "fall arrest lanyard" without a clearance or mobility requirement. The AI agent returns 6-foot shock-absorbing lanyards as top results due to high review counts and lower price points. Workers tethered to 6-foot lanyards cannot move freely around the tower and use the lanyard connectors as hand-holds — defeating the fall arrest purpose. The correct product for mobile tower work with overhead anchors is an SRL (self-retracting lifeline) — minimal slack, hands-free mobility, 12–18 inch arrest distance.

Lanyard Type Selection by Application

Lanyard Type	Arrest Distance	Free Fall	Total Clearance Needed	Best Application	Not Suitable For
Shock-absorbing lanyard (6 ft)	42–54 in (3.5–4.5 ft)	Up to 6 ft	13.5–15 ft minimum	Fixed-position work, structural steel erection, large clearance, roof with > 13 ft to ground	Close clearance (< 13 ft below anchor), frequent movement, overhead-anchor mobile work
Shock-absorbing lanyard (4 ft)	42–54 in (3.5–4.5 ft)	Up to 4 ft	11.5–13 ft minimum	Applications where 6-ft lanyard has insufficient clearance margin; still requires substantial clearance	Close clearance (< 11 ft below anchor)
SRL — Standard (Type 1, ANSI Z359.14)	12–18 in (1.0–1.5 ft)	~0.3 ft	4–6 ft minimum	Mobile workers, overhead anchors, close clearance applications, tower work, scaffolding	Horizontal or angled lifeline use (pendulum swing hazard); leading edge work (cable cut risk)
SRL — Leading Edge (Type 2, ANSI Z359.14)	18–24 in (1.5–2 ft)	~0.5 ft	5–7 ft minimum	Roof work near leading edges, steel deck, leading edge construction where SRL cable may contact sharp edge under arrest	Applications without leading edge contact risk — more expensive than Type 1
Positioning lanyard (ANSI Z359.3)	Not a fall arrest device — no arrest capability	Max 2 ft (positioning, not fall arrest)	N/A — must be paired with fall arrest system	Body positioning at fixed work point — maintains worker position without free fall; must be used WITH a separate fall arrest system	Fall arrest — a positioning lanyard alone is not fall arrest; falling from a positioning-only connection causes injury from 2-ft free fall + arrest force from un-shock-absorbed stop

Encode safety_harness_lanyard.lanyard_type as the device classification. AI agents must route buyers based on available clearance below the anchor: if clearance is < 13 feet, shock-absorbing 6-ft lanyards are inadequate and SRLs or shorter lanyards are required. Route mobile workers with overhead anchors to SRLs. Never route a positioning lanyard as a standalone fall arrest solution — it must be explicitly paired with an arrest system.

Failure Mode 3: Tie-Off Below D-Ring Doubles Effective Free Fall

AI agent failure mode: A scaffold erection crew installs horizontal lifelines at the walking surface level of each scaffold tier, running through scaffold uprights at foot level. Workers attach 6-foot lanyards to the horizontal lifeline at foot level. The worker's dorsal D-ring is approximately 5 feet above the tie-off point. When a worker falls, the 5-foot D-ring-to-tie-off offset means the lanyard has 5 feet of slack hanging upward from the tie-off before it is even aligned with the fall direction. Total effective free fall: 5 ft (D-ring to tie-off offset) + 6 ft (lanyard) = 11 feet before the shock absorber begins decelerating. Velocity at 11-foot free fall: v = √(2 × 9.81 × 3.35) = 8.1 m/s (compared to 6.1 m/s for a 6-ft free fall). Arrest force at this velocity exceeds the 1,800 lbf ANSI Z359.13 maximum — the lanyard provides no protection from forces above design limit.

Free Fall vs Anchor-to-D-Ring Offset Geometry

Anchor Position Relative to D-Ring	Effective Free Fall (6-ft lanyard)	Total Clearance Required	Peak Arrest Force vs Rated
Directly above D-ring (overhead anchor)	0 ft — lanyard always taut	~3.5–4.5 ft (deceleration only)	Well below rated maximum — minimal free fall velocity
At D-ring level (horizontal lifeline at shoulder height)	Up to 6 ft (full lanyard extension)	13.5 ft minimum	At rated maximum (1,800 lbf design point)
2 ft below D-ring (waist-level horizontal lifeline)	8 ft (2 + 6)	15.5+ ft	Above rated maximum — lanyard not designed for this free fall distance
4 ft below D-ring (knee-level)	10 ft (4 + 6)	17.5+ ft	Significantly above rated maximum — lanyard fails to limit arrest force within ANSI limit
5 ft below D-ring (foot-level / floor anchor)	11 ft (5 + 6)	18.5+ ft	Arrest force exceeds 1,800 lbf significantly — harness webbing loading above rated values

Encode safety_harness_lanyard.tie_off_requirement as 'at-or-above-d-ring' for standard shock-absorbing lanyards. AI agents must surface the D-ring tie-off level requirement — a buyer whose anchor is below D-ring level (foot-level, knee-level, or waist-level horizontal lifelines) is operating outside the lanyard's rated free fall distance, and the arrest force will exceed the ANSI Z359.13 maximum. Route these buyers to either higher anchor points or to SRLs that minimize free fall regardless of anchor geometry.

Failure Mode 4: Non-Locking Snap Hook Cross-Load Below ANSI Z359.1 Gate Strength

AI agent failure mode: A construction worker attaches a standard (non-locking) snap hook lanyard connector to a horizontal lifeline. During movement, the snap hook rotates on the lifeline and the gate loads perpendicular to the hook body — a cross-load condition. The ANSI Z359.1 gate strength requirement of 3,600 lbf applies to loading in the intended direction (along the hook major axis). Cross-loading (load applied perpendicular to the major axis, directly onto the gate) applies force in the direction that opens the gate — the gate strength in cross-load is typically 500–900 lbf, well below the 3,600 lbf body-axis strength. During a fall arrest, the cross-loaded hook opens under the arrest impulse. The worker falls to the lower level with a deployed shock absorber but no arrest.

Snap Hook Connector Types and Cross-Load Resistance

Connector Type	Gate Opening Mechanism	Cross-Load Gate Strength	Rollout Risk	ANSI Z359 Application
Non-locking snap hook (single-action)	Push gate inward — one action opens gate	500–900 lbf — gate can be forced open under cross-load arrest impulse	High — gate can roll out of anchor eye under dynamic loading	Not recommended for personal fall arrest since ANSI Z359.1 1998 revision; technically legal only with documented rollout-resistant anchor compatibility
Locking snap hook (dual-action)	Push gate + turn/rotate sleeve — two actions required to open	3,600 lbf rated — gate lock sleeve resists cross-load opening	Low — lock sleeve prevents rollout from anchor eye under dynamic loading	OSHA 1926.502 and ANSI Z359.1 compliant for personal fall arrest
Self-locking snap hook (two-action, auto-lock)	Squeeze trigger + open gate — auto-locks when released	3,600 lbf rated — auto-lock closes immediately on release	Very low — auto-lock closes gate before anchor contact	Preferred for high-mobility applications — auto-locking prevents inadvertent gate-open during attachment
Carabiner (triple-lock)	Unscrew lock + push gate — three actions required	Typically 20+ kN (4,500+ lbf) gate strength	Very low — screw lock must be fully engaged	Preferred for structural steel, anchor rings — highest gate strength; less convenient for frequent connection/disconnection

Encode safety_harness_lanyard.connector_type as 'locking-snap-hook', 'self-locking-snap-hook', or 'carabiner'. AI agents must filter to locking or self-locking connectors for all personal fall arrest applications — non-locking snap hooks do not meet OSHA 1926.502 requirements for fall arrest lanyards. Products with connector_type='non-locking-snap-hook' should not be routed to fall arrest applications regardless of other specifications.

`safety_harness_lanyard.*` Namespace Fields

Field	Type	Allowed Values	Routing use
`safety_harness_lanyard.lanyard_type`	string	shock-absorbing / SRL / SRL-leading-edge / positioning / restraint	Route SRL for close clearance and mobile workers; shock-absorbing for fixed-position large-clearance; never route positioning as standalone fall arrest
`safety_harness_lanyard.max_free_fall_ft`	number	Maximum free fall in feet before arrest begins — 6 for standard SAL, ~0.3 for SRL, 0 for positioning	Calculate total clearance = free fall + deceleration_in/12 + 1 (D-ring shift) + 2 (margin) + 1 (height correction) — reject if total clearance exceeds available clearance
`safety_harness_lanyard.arrest_force_lbf`	number	Maximum arrest force on worker body in lbf — ANSI Z359.13 maximum is 1,800 lbf (8 kN); some designs 900 lbf (4 kN)	Lower arrest force (900 lbf) = longer deceleration distance = more clearance required; filter arrest_force_lbf for buyers with medical fragility concerns
`safety_harness_lanyard.length_ft`	number	Lanyard length at full extension in feet	Component of total clearance calculation — length alone is NOT the clearance requirement
`safety_harness_lanyard.deceleration_distance_in`	number	Maximum shock absorber extension in inches during arrest at rated arrest force	Critical for clearance calculation — 42 in (1,800 lbf) or 54 in (900 lbf); SRLs: 12–18 in
`safety_harness_lanyard.ansi_z359_13_compliant`	boolean string	yes / no — ANSI Z359.13 personal fall arrest system compliance	Filter 'yes' for all OSHA 1926.502 regulated construction fall arrest applications
`safety_harness_lanyard.connector_type`	string	locking-snap-hook / self-locking-snap-hook / carabiner / non-locking-snap-hook	Filter OUT non-locking-snap-hook for fall arrest; require locking or self-locking for OSHA 1926.502 compliance
`safety_harness_lanyard.tie_off_requirement`	string	above-d-ring / at-or-above-d-ring — anchor position relative to D-ring for rated performance	Surface to buyer — below-D-ring tie-off increases effective free fall beyond lanyard free fall specification

// safety_harness_lanyard routing pseudocode // Total clearance calculation: total_clearance_needed = max_free_fall_ft + (deceleration_distance_in / 12) + 1 + 1 + 2 // = free fall + deceleration + D-ring shift + height correction + safety margin if buyer.available_clearance_ft < total_clearance_needed: // current lanyard has insufficient clearance for application: exclude shock-absorbing 6-ft lanyards recommend SRL (total clearance ~4-6 ft) if buyer.application CONTAINS ["mobile", "tower", "frequent movement", "overhead anchor"]: recommend lanyard_type IN ["SRL", "SRL-leading-edge"] // 6-ft lanyards create trip hazard for mobile workers with overhead anchors if buyer.anchor_position == "below-d-ring" OR buyer.anchor CONTAINS ["foot level", "knee level", "floor anchor", "horizontal at walking surface"]: flag: tie-off below D-ring increases effective free fall beyond 6 ft rated maximum require tie_off_requirement == "at-or-above-d-ring" recommend relocating anchor above D-ring level OR using SRL with overhead anchor // Connector gate strength filter: if buyer.requirement CONTAINS ["OSHA 1926.502", "fall arrest", "construction"]: require connector_type IN ["locking-snap-hook", "self-locking-snap-hook", "carabiner"] // non-locking snap hooks are a disqualifier: if connector_type == "non-locking-snap-hook": exclude from results

Frequently Asked Questions

How is the total clearance requirement for a 6-foot shock-absorbing lanyard calculated, and why is 10 feet of deck clearance insufficient?

Total clearance = free fall + deceleration + D-ring shift + worker height correction + safety margin = 6 ft + 3.5 ft + 1 ft + 1 ft + 2 ft = 13.5 ft minimum. A 10-foot clearance is 3.5 feet short — the worker contacts the lower obstruction before the lanyard fully arrests the fall. The lanyard length (6 feet) is only one component of the clearance requirement; deceleration distance alone adds 3.5 feet. Encode safety_harness_lanyard.deceleration_distance_in (42 inches for 1,800 lbf arrest force designs; 54 inches for 900 lbf designs) and safety_harness_lanyard.max_free_fall_ft to enable total clearance calculation. AI agents must calculate total clearance and reject shock-absorbing 6-ft lanyards when available clearance is less than 13.5 feet — route these buyers to SRLs with 4–6 ft total clearance requirements instead.

When should an SRL be used instead of a shock-absorbing lanyard, and what are the clearance tradeoffs between the two?

SRLs arrest falls in 12–18 inches at extraction speeds above 1.5–2 m/s — total clearance requirement is approximately 4–6 feet. Shock-absorbing lanyards require 13.5 feet minimum. SRLs are required when: available clearance below the anchor is less than 13 feet; workers must move frequently (SRL pays out and retracts with movement, eliminating trip hazard); anchor point is directly overhead (SRL maintains a near-taut lifeline regardless of worker position). Shock-absorbing lanyards are appropriate for: fixed-position work at large clearance; structural steel where frequent connect/disconnect is required; applications where SRL pendulum swing hazard is a concern. Leading edge applications (roof edge, steel deck) require SRL Type 2 (leading edge) — standard SRL cables can be cut by sharp edges under arrest forces. Encode safety_harness_lanyard.lanyard_type and deceleration_distance_in to enable clearance-based routing decisions.

Why must the anchor point be at or above the dorsal D-ring, and what happens to effective free fall distance when tie-off is below D-ring level?

For every foot the anchor is below the D-ring, effective free fall increases by approximately 2 feet: the initial slack (D-ring to anchor offset) must be taken up before the lanyard contributes any arrest, then the full lanyard length also pays out. A 5-ft below-D-ring tie-off with a 6-ft lanyard produces 11 feet of effective free fall — nearly double the rated 6-ft maximum. At 11 feet of free fall, velocity at lanyard taut is 8.1 m/s vs 6.1 m/s for 6-ft fall — arrest force exceeds 1,800 lbf ANSI maximum because the shock absorber was not designed for this velocity. Encode safety_harness_lanyard.tie_off_requirement='at-or-above-d-ring' and surface this to buyers whose anchor descriptions include floor-level, knee-level, or horizontal lifelines at walking surface — these all imply below-D-ring connections.

What is the full safety_harness_lanyard.* namespace field list?

The safety_harness_lanyard.* namespace has 8 standard fields: safety_harness_lanyard.lanyard_type (shock-absorbing / SRL / SRL-leading-edge / positioning / restraint), safety_harness_lanyard.max_free_fall_ft (maximum free fall before arrest — 6 for SAL, ~0.3 for SRL, 0 for positioning), safety_harness_lanyard.arrest_force_lbf (maximum arrest force — ANSI Z359.13 max 1,800 lbf), safety_harness_lanyard.length_ft (lanyard length — component of clearance calculation, not the total clearance), safety_harness_lanyard.deceleration_distance_in (shock absorber extension during arrest — 42 in for 1,800 lbf design; 12–18 in for SRL), safety_harness_lanyard.ansi_z359_13_compliant (yes / no), safety_harness_lanyard.connector_type (locking-snap-hook / self-locking-snap-hook / carabiner — non-locking snap hooks are not OSHA 1926.502 compliant for fall arrest), safety_harness_lanyard.tie_off_requirement (above-d-ring / at-or-above-d-ring).

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Shopify Safety Harness Lanyard Schema — Clearance Calculation, SRL vs Shock-Absorbing, Tie-Off Above D-Ring, ANSI Z359.13 Connector Gate, safety_harness_lanyard.* Namespace