Answering the common buyer query for 3/8 strut washers, this guide highlights sturdy square washer plates designed for 1-5/8″ strut channels. These are ideal for electrical, HVAC, and mechanical installations where a reliable 3/8″ bolt connection is required. Best suited for DIY enthusiasts, facility maintenance teams, and contractors needing durable, galvanised hardware. The table below summarizes five top picks to help you compare at a glance.
| Product | Size | Pack | Material |
|---|---|---|---|
| Afcabakila 35 Pcs | 1-5/8″ x 1-5/8″ | 35 pieces | Carbon steel, electrogalvanized |
| OTTFF 20 Pack | 1-5/8″ x 1-5/8″ | 20 pieces | Low carbon steel, electrogalvanized |
| Abeicy Strut Channel Washer | 50 x 40 x 13 mm | 10 pieces | Zinc-plated carbon steel |
| Afcabakila 60 Pcs | 1-5/8″ x 1-5/8″ | 60 pieces | Carbon steel, electrogalvanized |
| GBGS 30 Pack | 1-5/8″ x 1-5/8″ | 30 pieces | Low carbon steel, electrogalvanized |
Afcabakila 35 Pcs 3/8″ Square Strut Washer
Best for small to mid-size electrical or HVAC rack installations where frequent removal is unlikely but reliability is crucial. This set uses carbon steel with an electrogalvanized finish to resist corrosion and provide a robust bearing surface for 3/8″ bolts.
Why chosen: The 1-5/8″ square plates fit standard strut channels, offering a secure seat and consistent spacing. The 1/8″ thickness balances strength with ease of handling for common channel widths.
Best for: Maintenance technicians and contractors working on compact frameworks or retrofits where a moderate quantity is sufficient.
Caution: The finish is electrogalvanized; outdoor exposure in harsh salt-air environments may merit additional protective coatings beyond the factory plating.
OTTFF 20 Pack Square Strut Washer Plate
Better for larger installations or projects with higher bolt counts, offering a balanced 1-5/8″ square footprint and a thicker 7/32″ profile for increased rigidity. Pre-drilled hole size is compatible with 3/8″ bolts, aligning with common hardware standards.
Why chosen: This set emphasizes a slightly thicker plate, which can reduce bending under load in long-span applications. The electrogalvanized finish enhances corrosion resistance for indoor and sheltered outdoor uses.
Best for: Projects requiring added stiffness, such as equipment mounting racks or light-duty steel frames.
Caution: The thicker profile may be more noticeable in tight spaces; verify clearance before installation.
Abeicy 10 Packs Strut Channel Washer
Best for longer-term installations where corrosion resistance is important. Zinc-plated carbon steel provides a durable finish, with dimensions suited to standard 1-5/8″ Unistrut channels and 3/8″ bolt compatibility.
Why chosen: Affordable pack size supports multiple connection points without sacrificing strength. Thin-but-sturdy construction reduces the risk of crushing the strut slot during assembly.
Limitation: The zinc plating offers good protection but is not a substitute for specialized outdoor-grade coatings in extreme marine environments.
Afcabakila 60 Pcs 3/8″ Square Strut Washer Plates
Best for mid-to-large scale projects needing a generous supply of washers with dependable electrogalvanized protection. The 1-5/8″ square dimensions ensure compatibility with 1-5/8″ strut channels and 3/8″ bolts.
Why chosen: A larger pack reduces reordering frequency and supports multi-connection assemblies on complex frames. The electrogalvanized finish adds coating durability for frequent assembly tasks.
Caution: Ensure you have adequate bin space for 60 pieces; bulk packs may require inventory planning in small shops.
GBGS 30 Pack Square Washers Plate
Best for value-focused buyers who want a reliable option with standard pre-drilled holes. The 3/8″ bolt compatibility is confirmed by Φ10.5mm hole sizing, making it straightforward for typical unistrut installations.
Why chosen: This plate emphasizes a cost-effective option without sacrificing essential fit and finish. The low carbon steel with electro-galvanization offers balanced performance for indoor uses and light-duty outdoor applications.
Limitation: Heavier loads or outdoor salt environments may benefit from a thicker or marine-grade plating beyond the standard electrogalvanized finish.
Buying Guide: Key Factors For 3/8″ Strut Washers
- Channel compatibility: Ensure the washer’s inner dimensions match your 1-5/8″ strut channel for a secure fit.
- Bolt compatibility: Look for a Φ10.5mm (3/8″) hole to ensure full bolt seating and proper load distribution.
- Material and finish: Carbon steel with electrogalvanized coating offers good corrosion resistance for most indoor environments; marine or outdoor exposure may need zinc or stainless variants.
- Thickness: Common options are 1/8″ (about 2.8 mm) and 7/32″ (about 0.22″). Thicker plates provide more stiffness but require extra clearance.
- Pack size and workflow: Choose a pack size that aligns with your project scope to minimize reorders and keep on-site inventory clean.
FAQ
- What is a 3/8″ strut washer used for?
It provides a stable bearing surface for 3/8″ bolts within Unistrut or similar channel systems, distributing load and preventing damage to the channel slots.
- Are these washers suitable for outdoor use?
Most are electrogalvanized for indoor or sheltered outdoor use. For harsh outdoor or marine environments, consider thicker finishes or stainless alternatives.
- Which size is standard for 1-5/8″ strut channels?
Most 3/8″ bolt washers with 1-5/8″ square dimensions fit standard 1-5/8″ strut channels, providing reliable seating and alignment.
- Should I choose a thicker washer?
A thicker washer offers increased rigidity and load distribution but may reduce clearance in tight spaces. Balance with your mounting needs.
- Is a bulk pack more economical for contractors?
Yes, bulk packs reduce reordering and consolidate inventory for multi-connection installations, especially in workshops or job-sites with frequent mounting.