ANSI Z359 Fall Protection Code

The ASSP-published family of standards covering harnesses, connecting components, self-retracting devices, anchorages, and managed fall protection programs

Last updated: April 4, 2026

Overview

ANSI/ASSP Z359 is the American National Fall Protection Code. It is not a single document but a family of individual standards covering every component, system, and program element of personal fall protection: harnesses, lanyards, energy absorbers, self-retracting devices, anchorages, connecting components, climbing systems, and the management program that ties it all together.

The code is published by the American Society of Safety Professionals (ASSP) as the secretariat for the ANSI Z359 Accredited Standards Committee. It covers general industry and construction work at height and is the benchmark equipment manufacturers meet when stamping a harness, SRL, or anchor as "ANSI Z359 compliant."

Voluntary but enforced: ANSI Z359 is a voluntary consensus standard, not a federal regulation. OSHA does not fully incorporate it by reference. However, OSHA 1926.502 performance criteria line up with Z359, and inspectors regularly cite Z359 as the recognized "good practice" benchmark under the General Duty Clause (Section 5(a)(1)). Using equipment that meets Z359 is the cleanest way to demonstrate compliance with OSHA's fall protection performance requirements.

Major manufacturers who design to the Z359 family include MSA Safety, 3M (Capital Safety / DBI-SALA / Protecta), Honeywell Miller, Guardian, FallTech, and Werner.

Z359 Standards Family

The Z359 code is a collection of numbered sub-standards, each covering a specific component type or program element. You rarely reference the whole code directly. In practice, you reference the specific sub-standard that applies to the equipment or program you are evaluating.

Standard	Title	What It Covers
Z359.0	Definitions and Nomenclature	Baseline vocabulary used across the rest of the family. Read first if terms like "competent person," "qualified person," or "free fall" are unfamiliar.
Z359.1	Fall Protection Code (overall)	The original umbrella standard for personal fall arrest system components and performance. Much of its content has since been broken out into component-specific sub-standards (Z359.11, .12, .13, .14, etc.).
Z359.2	Managed Fall Protection Program	Requirements for an employer's written fall protection program: program administrator, hazard surveys, rescue planning, training, and documentation. The program-level companion to the equipment standards.
Z359.11	Full-Body Harnesses	Harness design, labeling, D-ring types and placement, static and dynamic strength, and performance testing.
Z359.12	Connecting Components	Snap hooks, carabiners, D-rings, and other hardware. Includes the 3,600 lbf gate-face load requirement that replaced older 350 lbf snap hooks.
Z359.13	Lanyards and Energy Absorbers	Shock-absorbing lanyards, personal energy absorbers, and free-fall lanyards. Covers 6-foot free fall limit and 12-foot deceleration distance performance criteria.
Z359.14	Self-Retracting Devices	SRLs (self-retracting lifelines), self-retracting lanyards, and SRL-LE (leading edge) devices. Class 1 vs Class 2 distinction, dynamic drop testing, and leading-edge performance.
Z359.15	Single Anchor Lifelines and Fall Arresters	Vertical lifeline systems with a single anchor point and a sliding rope grab. Covers both synthetic rope and wire rope systems.
Z359.16	Climbing Systems	Ladder and pole climbing fall arrest systems — rigid rail and cable climb assists used on towers, wind turbines, water tanks, and fixed industrial ladders.
Z359.18	Anchorage Connectors	Beam clamps, beam straps, cross-arm straps, D-bolt and through-bolt anchors, and similar devices that connect to the structure. Type A (restraint/work positioning) vs Type E (fall arrest) classification.

Additional sub-standards exist for rescue equipment (Z359.4), active fall protection system design (Z359.6), and other specialized topics. The table above covers the sub-standards most frequently cited on jobsites and in equipment markings.

ANSI Z359.14-2021: Self-Retracting Devices

Self-retracting devices — commonly called SRLs, "yo-yos," or retractables — pay out a lifeline under light tension and lock under a sudden load to arrest a fall. The 2021 revision of Z359.14 made the single biggest change to SRL markings in years: the Class 1 and Class 2 designations.

Class 1 vs Class 2

Class	Anchorage Location	Allowed Free Fall	Typical Use
Class 1	At or above the dorsal D-ring	Up to 2 ft of free fall	Overhead anchor points — beams, trolleys, rooftop fall arrest systems, scissor lifts, scaffolds with top-tied anchorage.
Class 2	Anywhere from foot level up to the D-ring	Up to 6 ft of free fall	Leading-edge work, foot-level anchors on roofs and formwork, and any application where the anchor is at or below the worker's D-ring.

Why this matters on the jobsite: A Class 1 SRL is not rated for foot-level anchorage. Using a Class 1 unit at foot level increases free fall beyond what the device was dynamically tested for and can generate peak forces that exceed harness and anchor ratings. If the anchor is at or below your D-ring, you need a Class 2 device — often marked SRL-LE for leading edge — and ideally one rated for the specific leading-edge substrate you're working near (steel edge, concrete, wood).

Testing Requirements

Z359.14-2021 specifies a battery of tests every SRL must pass before it carries the ANSI mark. The 2021 revision tightened several criteria and added leading-edge-specific tests.

Dynamic performance (drop) test: The device is subjected to a weighted drop matching its class (2 ft for Class 1, 6 ft for Class 2) and must arrest the fall with an average arrest force not exceeding 1,800 lbf and a maximum arrest distance within the manufacturer's stated value.
Leading edge (SRL-LE) test: Class 2 devices intended for leading-edge use are drop-tested with the lifeline routed over a simulated sharp edge to verify it does not sever under load.
Static strength: Full-unit static load applied to the extended lifeline with no failure.
Lock speed / operational tests: Verifies the braking mechanism activates within the specified line payout speed across temperature range.
Environmental conditioning: Hot, cold, wet, and corrosion conditioning prior to performance testing.

ANSI Z359.11: Full-Body Harnesses

For fall arrest, OSHA and ANSI both require a full-body harness. Body belts (waist-only belts) have not been allowed for fall arrest under OSHA 1926.502 since January 1, 1998. Z359.11 defines what qualifies as a compliant full-body harness and how each D-ring may be used.

Core Design Requirements

Distributes fall arrest forces across the thighs, pelvis, waist, chest, and shoulders so no single point takes the full impact
Keeps the wearer upright post-arrest to minimize suspension trauma
Harness webbing and stitching pass dynamic and static strength tests after environmental conditioning
Labels must include manufacturer, model, date of manufacture, size, standards met, and a grommet or box for recording inspection dates
User instructions supplied with every harness and available for the service life of the product

D-Ring Placement and Use

D-Ring	Location	Allowed Use
Dorsal (back)	Between the shoulder blades	Primary fall arrest attachment. Always the preferred connection point for SRLs and shock-absorbing lanyards.
Sternal (chest)	Upper chest, centered	Ladder climbing, rescue, retrieval, controlled descent. Acceptable for fall arrest only in specific applications where the free fall is limited.
Frontal (hip-belt front)	Waist, center front	Ladder climb and work positioning only. Not for fall arrest.
Hip / Side	Both sides of the hip belt	Work positioning only (used in pairs with a positioning lanyard). Not for fall arrest. A separate fall arrest attachment is still required.
Shoulder	Both shoulder straps	Rescue and retrieval only (used in pairs). Not for fall arrest.

5,000 lb: what it actually refers to. The commonly cited "5,000 lb" number in fall protection is the anchorage strength required by OSHA 1926.502(d)(15) — each personal fall arrest anchor must be capable of supporting at least 5,000 lbf per worker attached, OR be part of a system designed by a qualified person with a safety factor of at least two. The harness itself is not "5,000 lb rated" in the same sense. Harness components are tested to dynamic and static loads well above any force a human body can survive, but the anchor is the 5,000 lb number most crews are actually thinking of.

OSHA 1926.501/502 Connection

ANSI Z359 is the equipment and program standard. OSHA 1926.501 and 1926.502 are the legally enforceable rules that decide when fall protection is required and what the system must perform like. Understanding how the two interact is how you avoid both citations and injuries.

When Fall Protection Is Required

Construction: OSHA 1926.501 triggers fall protection at 6 feet above a lower level. Additional triggers exist for leading edges, hoist areas, holes, formwork, ramps, and excavations.
General industry: OSHA 1910.28 triggers fall protection at 4 feet above a lower level. Lower thresholds apply around dangerous equipment.
Steel erection, scaffolds, and certain specialty work have their own threshold heights and system requirements.

Fall Arrest vs Fall Restraint

System	What It Does	Key Requirement
Fall restraint	Prevents the worker from reaching a fall hazard in the first place. Lanyard length and anchor location are set so a fall is not possible.	Anchor rated for restraint loads (typically 1,000 lbf minimum under ANSI Z359.18 Type A, or 3,000 lbf if certified to support a worker plus safety factor).
Fall arrest	Stops a fall that has already begun using a harness, connector, energy absorber, and anchor.	Anchor capable of 5,000 lbf per worker or designed by a qualified person at 2× safety factor. Free fall limited to 6 ft. Maximum arrest force on the body capped at 1,800 lbf.
Work positioning	Holds the worker in position while both hands are free to work (rebar, steel erection, tower climbing at rest points).	Anchor rated for at least twice the intended load. A separate fall arrest system is still required.

Incorporation by reference: OSHA 1926.502 Subpart M does not fully incorporate ANSI Z359 by reference. However, the performance criteria in 1926.502 — maximum arrest force, free fall limit, anchor strength — are largely harmonized with Z359. Equipment that carries a Z359 mark is accepted by OSHA inspectors as meeting the corresponding performance requirements in 1926.502.

For the threshold rules, system types, and training requirements in detail, see our OSHA 1926.501 Fall Protection page and the fall protection for low-slope roofs guide.

Inspection & Retirement

ANSI Z359 requires two levels of inspection: a pre-use inspection by the user before every shift, and a formal documented inspection by a competent person at least annually. Equipment that fails either inspection must be removed from service immediately.

Pre-Use Inspection (User, Every Shift)

Webbing: cuts, burns, chemical damage, UV degradation, fraying, broken stitches
Hardware: distortion, cracks, corrosion, sharp edges, gate function on snap hooks and carabiners
D-rings: deformation, sharp edges, wear at attachment points
Energy absorber / shock pack: pouch intact, no evidence of deployment or partial tear-out
SRL lifeline: full and free retraction, positive lock when jerked sharply, no exposed wire core on cable units
Labels: present, legible, and within the manufacturer's stated service life
Impact indicator: not deployed (red flag, bent pin, or similar visual cue — indicator type varies by manufacturer)

Annual Competent Person Inspection

At least once per year (more often in corrosive environments or with heavy use), a competent person other than the user must formally inspect every piece of fall protection equipment. The inspection is documented in a record that travels with the equipment.

Inspection performed under controlled conditions with proper lighting
Each component examined in full — harness extended flat, SRL lifeline fully payed out, lanyard uncoiled
Inspection date, inspector name, and pass/fail recorded on the label grommet or in a log
Failed equipment tagged, removed from service, and destroyed so it cannot be returned to use

Retire after any fall arrest. A harness, lanyard, or SRL that has arrested a fall must be removed from service immediately — even if no visible damage is present. The energy absorber and internal components are single-use. The only acceptable post-fall action is destruction and replacement.

Many manufacturers also publish a fixed service life (often 5 years from first use, or 10 years from manufacture date) regardless of visible condition. Check the manufacturer's literature for the specific retirement rules on each piece of equipment.

Common Violations

OSHA 1926.501 has been the single most-cited construction standard for more than a decade. The same handful of mistakes show up in citation data year after year.

Violation	What Goes Wrong	Prevention
No fall protection at all	Worker is exposed to a fall of 6 ft or more (construction) with no guardrail, net, or personal fall arrest system in place.	Job hazard analysis before work starts. Guardrails or PFAS planned and provided before anyone goes up.
Inadequate anchor	Anchor point not rated for 5,000 lbf — tied off to rebar, ductwork, plumbing, or a random steel member with no engineering review.	Use a certified anchor (beam clamp, D-bolt, pre-installed roof anchor) or have a qualified person certify the connection.
Wrong SRL class for the anchor height	Class 1 SRL anchored at foot level. Free fall exceeds 2 ft and the device is not rated for the higher arrest forces that result.	Match SRL class to anchor location. For leading-edge or foot-level anchors, use a Class 2 SRL-LE.
Wrong D-ring used	Lanyard or SRL clipped into a hip or shoulder D-ring for fall arrest. Those rings are not arrest points and can twist the worker into a dangerous post-fall posture.	Train workers on D-ring use. Dorsal D-ring is the default fall arrest connection.
No rescue plan	Fall arrest system in place, but no plan for how to retrieve a suspended worker before suspension trauma sets in.	Written rescue plan per Z359.2 before work starts. Rescue equipment on site and training current.
Missing annual inspection	Harness, SRL, or lanyard in service past the annual inspection date with no competent person record.	Log every piece of equipment. Calendar reminder 30 days before the inspection due date.
Body belt for fall arrest	Waist-only belt used as a fall arrest attachment. Prohibited since 1998.	Full-body harness only for fall arrest. No exceptions.
Excessive free fall	Lanyard length plus anchor height allows more than 6 ft of free fall, exceeding the energy absorber's design limit.	Calculate total fall distance (free fall + deceleration + harness stretch + safety margin). Shorten the lanyard or raise the anchor.

Frequently Asked Questions

Is ANSI Z359 legally required?

Not directly. ANSI Z359 is a voluntary consensus standard, not a federal regulation. OSHA 1926.501 and 1926.502 are the enforceable rules. However, OSHA inspectors treat Z359 as the recognized good-practice benchmark, and equipment marked to Z359 is accepted as meeting OSHA's performance criteria. Failing to follow Z359 on equipment selection, inspection, or program structure can still result in a General Duty Clause citation.

What is the difference between a Class 1 and Class 2 SRL?

The distinction, introduced in ANSI Z359.14-2021, is about where the SRL can be anchored. Class 1 devices are tested for anchorage at or above the dorsal D-ring with no more than 2 feet of free fall. Class 2 devices are tested for anchorage anywhere from foot level up to the D-ring with up to 6 feet of free fall. Class 2 units intended for leading-edge use are typically marked SRL-LE. Using a Class 1 SRL at foot level is a common and dangerous mistake.

Can I use a body belt instead of a full-body harness?

Not for fall arrest. OSHA prohibited body belts as fall arrest connection points on January 1, 1998. A full-body harness that meets ANSI Z359.11 is the only acceptable connection for fall arrest. Body belts are still used for work positioning and restraint, but a separate fall arrest system is required whenever a fall hazard exists.

What anchor strength does OSHA actually require?

OSHA 1926.502(d)(15) requires that each personal fall arrest anchor support at least 5,000 pounds per worker attached, or be designed and used as part of a complete personal fall arrest system that maintains a safety factor of at least two under the supervision of a qualified person. 5,000 lbf is the default; the 2× safety factor is the engineered alternative.

When do I need fall protection?

In construction, OSHA 1926.501 requires fall protection for any exposure to a fall of 6 feet or more to a lower level, plus additional triggers for leading edges, hoist areas, holes, formwork, and certain specialty work. In general industry, OSHA 1910.28 sets the trigger at 4 feet. State OSHA plans may set lower thresholds.

How often do I need to inspect my harness and SRL?

The user performs a pre-use inspection before every shift. A competent person other than the user performs a documented inspection at least once per year, or more often in corrosive or heavy-use environments. Any equipment that has arrested a fall is retired from service immediately regardless of visible condition.

What is the difference between fall arrest and fall restraint?

Fall restraint prevents the worker from ever reaching the fall hazard — the lanyard is sized so a fall is physically impossible. Fall arrest allows the worker to approach and potentially fall past the edge, then stops the fall with a harness, energy absorber, and anchor. Restraint is safer and preferred when the work can be done without reaching the edge; arrest is required when the work itself has to happen at or past the edge.

Who qualifies as a "competent person" for fall protection inspections?

OSHA defines a competent person as someone who can identify existing and predictable hazards in the work environment and has the authority to take corrective action. For fall protection inspections under ANSI Z359.2, that person must also have training on the specific equipment types being inspected and the manufacturer's inspection criteria. A competent person does not need to be a licensed engineer, but they do need documented training.