Titan II Contractor Harness with Integrated Padding
The Miller T4577 Titan II Contractor is the padded, all-day version of the Titan II: integrated back and shoulder pads with strategic airflow, lumbar support, a body belt, and side D-rings for positioning, all on the same non-stretch hi-viz webbing platform. It is built for the worker who wears a harness from the first break to the last load.
Certified to ANSI Z359.11 and compliant with OSHA 1926.502 and 1910.140, the T4577 supports a 420 lb maximum working load including clothing and tools. The Universal (L/XL) size fits the majority of workers.
Miller Harness Sizing Chart
Height (ft) by Weight (lb)
| 110 | 130 | 150 | 170 | 190 | 210 | 230 | 250 | 270 | 290 | 310 | 330 | 350 | 370 | 390 | 400 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6′6″ | ||||||||||||||||
| 6′4″ | XXL/XXXL | |||||||||||||||
| 6′2″ | ||||||||||||||||
| 6′ | ||||||||||||||||
| 5′10″ | UNIVERSALMost Popular Size (L/XL) | |||||||||||||||
| 5′8″ | ||||||||||||||||
| 5′6″ | ||||||||||||||||
| 5′4″ | ||||||||||||||||
| 5′2″ | S/M | |||||||||||||||
| 5′ |
S/M fits workers up to 5 ft 10 in and 170 lb, or up to 190 lb at 5 ft 6 in and under. Universal (L/XL) covers the broad middle and is the most popular size. XXL/XXXL fits workers over 6 ft who weigh over 270 lb, and any worker from 350 to 400 lb. Lighter boundary bands are overlap zones where either size fits: size down for a trim fit or up for room over layers. Some Miller spec sheets list these as Size 1 (S/M), Size 2 Universal (L/XL), and Size 3 (2XL and 3XL). Based on the manufacturer's published Miller sizing chart; verify fit per the user manual before first use.
Who Needs This Product
The T4577 is for contractors and full-time at-height trades that wear a harness all day, every day. The lighter, strategically placed padding provides optimal airflow instead of trapping heat, the lumbar pad supports the lower back under tool load, and the belt keeps tool bags positioned. Occasional users can save with the unpadded T4500, and workers who only need positioning rings without padding should look at the T4507.
Features
Integrated Back and Shoulder Pads
Lighter, strategically placed padding cushions the harness under all-day wear while letting air move, reducing fatigue without the bulk.
Lumbar Support and Belt
The lumbar pad and integrated belt carry tool weight on the hips and keep bags positioned where the worker expects them.
Side D-Rings
Hip-level positioning D-rings accept a positioning lanyard for hands-free work at a fixed location.
Sliding Back D-Ring
The dorsal D-ring self-centers between the shoulder blades for the fall arrest connection.
Hi-Viz Orange Webbing
High-visibility non-stretch polyester keeps workers conspicuous and holds its adjusted fit through the shift.
Five Points of Adjustment
Adjustment at the chest, both shoulders, and both legs provides each worker with a custom fit.
Technical Specifications
| SKU | T4577/UAK |
|---|---|
| Product | Titan II Contractor Harness |
| Size | Universal (L/XL) |
| Color | Hi-Vis Orange |
| D-rings | Sliding dorsal (back) plus two side positioning D-rings |
| Padding | Integrated back and shoulder pads with lumbar support |
| Belt | Integrated body belt |
| Chest buckle | Mating |
| Leg buckles | Tongue |
| Adjustment points | 5 (chest, shoulders, legs) |
| Webbing | Non-stretch polyester |
| Max working load | 420 lb / 190 kg including all clothing, tools, and equipment |
| Packaging | Boxed |
| Country of origin | Mexico |
| Standards | ANSI Z359.11; OSHA 1926.502; OSHA 1910.140; TAA compliant |
| Warranty | Miller Limited Lifetime Warranty against defects in workmanship and materials |
Padding is comfort, not protection. The pads and belt do not change the fall arrest rules: connect fall arrest to the back D-ring, use the side D-rings for positioning only, and retire the harness immediately after any fall arrest event.
Compliance Standards
ANSI Z359.11
Certified to the ANSI/ASSE Z359.11 standard for full body harnesses, covering design, testing, and marking requirements.
OSHA 1926.502 and 1910.140
Meets OSHA requirements for personal fall arrest system body wear in both construction and general industry.
OSHA 1926.502(e)
The side D-rings support work positioning systems rigged to limit free fall to 2 ft, as OSHA requires for positioning device systems.
TAA Compliant
Listed as TAA compliant by the manufacturer, allowing purchase on federal projects that require Trade Agreements Act sourcing.
Typical Applications
Donning Overview
- Hold the harness by the back D-ring and shake it out so the straps hang free without twists.
- Slip the shoulder straps on like a vest, keeping the webbing flat against the body.
- Connect the chest buckle and position the chest strap across the middle of the chest.
- Fasten each leg buckle so the strap allows a flat hand between the strap and the leg, but not a fist.
- Work through all five adjustment points until the dorsal D-ring rests between the shoulder blades, then stow the strap ends.
Full donning and adjustment instructions are in the Miller harness manual linked in the documentation section below.
Inspection and Retirement
Inspect this harness before each use, and have a competent person other than the user formally inspect it at least annually per ANSI Z359.2. Check each point below and record the results on the inspection form linked in the documentation section.
- Webbing: cuts, frays, burns, chemical damage, UV fading, or broken stitching anywhere on the harness.
- Hardware: D-rings and buckles for cracks, corrosion, distortion, or sharp edges.
- Adjusters and keepers: slippage, missing keepers, or strap ends that will not stay stowed.
- Labels: present and legible, including the size, standards, and serial information.
Retirement triggers: any fall arrest event, any webbing or hardware defect found during inspection, or any condition where the inspector cannot positively verify the harness is fit for service.
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
Miller T4577 Titan II Contractor Harness Submittals and Documentation
T4577 Specification Sheet (PDF)Technical data, sizing, materials, and SKU-level UPC information. T4577 User Instruction Manual (PDF)Miller I119 manual: donning, adjustment, use limitations, and inspection criteria. Miller Fall Protection Catalog (PDF)The full Miller line: body wear, connecting devices, anchors, and rescue. T4577 Harness Inspection Form (PDF)Printable pass/fail checklist for documented harness inspections.Compatible and Related Products
- Miller T4500 Titan II Non-Stretch Harness. The unpadded entry point to the Titan II line.
- Miller T4507 Titan II Positioning Harness. Side D-rings without the padding and belt.
- Guardian 10733 Suspension Trauma Strap, 4-Pack. Add a trauma relief strap to every harness on the crew.
Outfitting a Crew with Contractor Harnesses?
Sizing, padding, and duty level decide the right harness. Confirm your crew 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.
Miller Limited Lifetime Warranty
Miller Fall Protection products are covered by the Miller Limited Lifetime Warranty. In the manufacturer's words: "We sincerely believe that our fall protection equipment is the best in the world. Our products endure rigorous tests to ensure that the fall protection equipment you trust is manufactured to the highest standards. Miller fall protection products are tested to withstand normal wear and tear, but are not indestructible and can be damaged by misuse."
In the unlikely event that you should discover defects in either workmanship or materials, under the Limited Lifetime Warranty, Miller will repair or replace the product at the manufacturer's expense. If a replacement is necessary and your product is no longer available, a comparable product will be substituted. The Limited Lifetime Warranty does not apply to normal wear and tear or abusive treatment of the product.
Miller is a brand of Protective Industrial Products, Inc. (PIP). Should a product issue surface, contact Fall Protection Distributors, LLC and we will coordinate the warranty claim with the manufacturer.
