VELCRO® Brand Molded Hook 511 is engineered for applications that demand high engagement strength, reliable holding power, and controlled low-cycle life. It replaces mechanical hardware in compact assemblies and bonds securely to fabrics, plastics, metals, and composites when paired with the right adhesive system.
Why Choose VELCRO® Brand Molded Hook 511?
VELCRO® Brand Hook 511, previously known as MVA #8, is a robust molded hook fastener designed for high shear strength, reliable tensile performance, and repeatable engagement in low-cycle applications. This makes it ideal when you need a semi-permanent closure that grips aggressively and stays put.
Key advantages:
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Heavy-duty engagement profile for strong, positive fastening
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Low-cycle life (LCL) design that prioritises strength over repeated ouvrings
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Excellent performance on fabric panels, industrial textiles, foams, and technical composites
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Available with or without pressure-sensitive adhesive to suit your assembly process
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Thin profile that integrates neatly into garments, straps, covers, equipment wraps, and OEM builds
Typical use cases include bracing straps, protective gear, medical soft goods, filtration media, transportation interiors, packaging hold-down points, and industrial equipment wraps.
Technical Specifications
Hook Type: Molded, heavy-engagement profile (MVA #8)
Cycle Life: Low (engineered for strength over longevity)
Material: Nylon molded hook
Widths: Standard 1 inch
Roll Length: 25 yards
Colours: Black (common industry stock)
Adhesive-Backed Version (Hook 511 + Adhesive 72)
Adhesive 72 is a water-based acrylic offering:
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Medium tack.
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Moderate moisture resistance.
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Good adhesion to high-surface-energy (HSE) substrates, including stainless steel, aluminium, acrylics, polycarbonate, glass, polyester and painted metals.
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Not recommended for low-surface-energy (LSE) plastics, such as polyethylene or polypropylene.
Non-Adhesive Version
Designed for sewing, ultrasonic bonding, RF welding, lamination, or mechanical integration into fabric channels and foam assemblies.
Environmental & Performance Notes
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Suitable for indoor environments and many controlled outdoor environments.
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Acrylic adhesive provides better UV and solvent resistance than rubber-based alternatives.
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Maintains shear strength under compression loads where traditional sewn fasteners fail.
Application Guide
To ensure maximum shear strength and long-term performance:
For Adhesive-Backed Hook 511
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Prepare the surface
Clean with 70% isopropyl alcohol and allow to dry completely. -
Avoid LSE substrates unless using a surface primer or alternative adhesive system.
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Apply firm pressure
Acrylic adhesives are pressure-sensitive and require 15–20 PSI for proper wet-out. -
Allow cure time
Full adhesive strength develops over 24–72 hours depending on temperature and substrate porosity.
For Sew-On or Mechanical Use
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Use reinforced stitching when fastening to high-load textiles.
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Avoid placing the hook edge where it may snag unintended materials.
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Ensure alignment accuracy to maintain consistent shear performance when engaged with the loop component.
FAQs
Is VELCRO® Brand Hook 511 removable?
The adhesive-backed version offers strong, semi-permanent adhesion. It can often be removed from metals and glass with heat and adhesive remover, although residues may remain. For removable applications, consider a lower-tack acrylic system instead.
Does Hook 511 work with any loop?
It pairs best with low-profile knit loops such as VELCRO® Brand 3610 or 3905. Using a compatible low-pile loop maximises shear strength and ensures predictable engagement.
Does it bond to powder-coated surfaces?
Adhesive 72 can bond to many powder-coated metals. Surface energy varies between coatings, so testing is recommended. Primer 94 may improve adhesion.
Can this be used outdoors?
The molded hook itself is suitable for intermittent outdoor exposure. The adhesive version holds well in moderate outdoor conditions, although extended UV or moisture exposure may reduce service life.