Panduit TMEH3S8-D350 Medium Duty Torque Mount, 5/16" Bolt, 500-Pack

Overview

The Panduit TMEH3S8-D350 is a medium duty torque mount engineered for permanent cable tie anchoring in both indoor and outdoor environments. Designed around a 5/16" (8mm) bolt interface, these mounts incorporate a built-in retention tab that holds the bolt at any position without additional hardware or manual assistance — a practical detail that matters when you're working overhead or in confined cable trays where both hands are rarely free. Each unit is molded from Impact Modified Heat Stabilized Weather Resistant Nylon 6.6 (PA 6.6), the same base polymer used across Panduit's commercial-grade wire management line for its dimensional stability under thermal cycling and UV exposure. The TMEH3S8-D350 arrives in a 500-piece package, priced for integrators running structured cabling, security camera backbones, or industrial control wiring at volume.

Browse the full Panduit cable management catalog to pair these mounts with compatible ties, raceways, and conduit accessories.

Key Features

• Retention Tab in Bolt Hole: The interference-fit tab grips the 5/16" bolt in any rotational position — no wrench required to hold it during positioning. On ceiling runs or dense panel builds where you need a free hand, this eliminates a surprisingly common frustration during installation.
• Impact Modified Nylon 6.6 Construction: PA 6.6 offers a higher continuous service temperature than standard nylon 6 and resists embrittlement from UV exposure — important for any mount that will see direct sunlight on rooftop conduit runs or in skylighted warehouses. The material is rated for both indoor and outdoor use without separate UV-rated versions to stock.
• Heat Stabilized Formulation: The heat stabilization additive package extends service life in environments with elevated ambient temperatures — mechanical rooms, above-ceiling plenum spaces, and industrial floors where heat from equipment can push ambient temps well above standard office conditions.
• Wide Cable Tie Compatibility: Accepts miniature, intermediate, standard, light heavy, heavy, and extra-heavy cross-section ties. That range covers virtually every cable tie in a standard integrator kit, so you're not locked into a specific strap series on the same job.
• 5/16" (8mm) Bolt Sizing: The bolt specification aligns with common framing anchors, unistrut hardware, and standard metric fasteners used in commercial construction. No specialty fasteners needed — the mount integrates with existing hardware on-site.
• Black Color, UV Stable: Black pigmentation provides inherent UV protection in addition to the chemical stabilizers in the polymer. In exposed outdoor installations, color-stable mounts signal to inspectors and AHJs that the installation was built for long-term service, not substituted with a generic alternative.
• Compact Form Factor — 1.15" W × 0.77" H × 1.85" L: The small footprint (29.3mm × 19.6mm × overall length) keeps the mount from creating clearance issues inside enclosures, along wire trays, or in densely packed conduit runs. You can anchor multiple runs in close proximity without mechanical interference between adjacent mounts.
• 500-Count Package: Volume packaging at 500 units per pack is sized for project-scale deployment — structured cabling pulls, camera backbone runs, or industrial wire management where per-unit cost matters. Ordering fewer packs reduces freight and simplifies job costing.

Integration and Compatibility

The TMEH3S8-D350 is positioned within Panduit's wire routing, management, and protection product line. It is compatible with the full range of Panduit cable ties from miniature through extra-heavy cross-section, as well as third-party ties that match those cross-section profiles. The 5/16" bolt requirement is a standard hardware specification, making these mounts straightforward to incorporate into any unistrut, threaded rod, or framing-anchor installation. Competitor part reference: HDM321HIHSUVH4 — integrators transitioning from that SKU will find the TMEH3S8-D350 a direct functional replacement.

For high-density deployments, consider pairing these mounts with Panduit's cable tie assortment to consolidate purchasing and ensure cross-section compatibility across the job. For network equipment rooms and security camera backbone cabling, these mounts are frequently used alongside wire duct and raceway to provide a complete managed pathway solution.

Frequently Asked Questions

Q: What bolt size does the TMEH3S8-D350 require?

A: The TMEH3S8-D350 requires a 5/16" (8mm) bolt. This is a standard hardware size compatible with unistrut fittings, threaded rod, and common structural fasteners used in commercial installations.

Q: Can the TMEH3S8-D350 be used outdoors?

A: Yes. The mount is made from Impact Modified Heat Stabilized Weather Resistant Nylon 6.6 (PA 6.6) and is explicitly rated for both indoor and outdoor use. The black color also provides additional UV resistance.

Q: What cable tie sizes are compatible with the TMEH3S8-D350?

A: These mounts accept miniature, intermediate, standard, light heavy, heavy, and extra-heavy cross-section cable ties — covering the full practical range of ties used in commercial and industrial cabling work.

Q: How many mounts come in a package?

A: The TMEH3S8-D350 is sold in packages of 500 units, designed for project-scale purchasing.

Q: What is the overall size of the TMEH3S8-D350?

A: The mount measures 1.15" wide (29.3mm) × 0.77" high (19.6mm) × 1.85" long overall — a compact footprint suited to tight enclosure and conduit work.

Q: Is the TMEH3S8-D350 interchangeable with the HDM321HIHSUVH4?

A: Panduit lists the HDM321HIHSUVH4 as a competitor cross-reference for the TMEH3S8-D350, indicating functional equivalence for medium duty torque mount applications using a 5/16" bolt.

James Everett

The spec I always point integrators to first on the TMEH3S8-D350 is the retention tab in the bolt hole — it sounds minor until you've spent 20 minutes on a ladder holding a 5/16" bolt in position while trying to thread a tie through a loaded cable tray. On structured cabling pulls across a 50,000 sq ft warehouse floor, that single feature saves real labor hours across 500 install points.

Technical Highlights:

• PA 6.6 Impact Modified Polymer: Higher tensile and flexural strength than nylon 6 under thermal cycling — relevant when mounts are installed near heat-generating equipment or in plenum above commercial HVAC ducts where ambient temps can spike.
• 5/16" Bolt Interface: Aligns directly with standard unistrut hardware and M8 metric fasteners, so the mount integrates into existing structural attachment points without adapter hardware or non-standard fasteners.
• 1.15" × 0.77" Footprint: Small enough to place multiple mounts in close proximity along cable trays without mechanical interference — useful in the dense horizontal runs common in security camera backbone cabling and access control wiring.

Deployment Considerations:

• The 500-unit pack is priced for project-scale purchasing — factor the full quantity into your material takeoff early; partial packs aren't a standard option at this SKU level.
• Tie cross-section compatibility spans miniature through extra-heavy, but verify your specific Panduit tie series cross-section before ordering if you're mixing tie families on the same job — not all third-party ties labeled "standard" match Panduit's cross-section tolerances precisely.

This mount is the right call for security integrators running camera backbone cabling in commercial construction where outdoor-rated hardware is required at the cable tie anchoring points — particularly on rooftop conduit runs, exterior equipment rooms, and covered parking structures where UV and heat exposure will eventually degrade a non-stabilized mount.