M42 x 137mm Black Self Threading Nut Cap (51mm Max Nut Height)

M42 x 137mm - Self Threading Nut Caps (51mm Max Nut Height) - Black - LDPE | Vital Parts - STNC-M42-137-51-B

Our Self Threading Nut Caps are the ideal solution for safely sealing and protecting exposed threads on bolts and studs. Designed for quick, tool-assisted application, these caps provide long-lasting protection against environmental damage, while also improving aesthetics and safety in a range of installations.

What are Self Threading Nut Caps?

Self Threading Nut Caps, also known as Thread Caps or Stud Protection Caps, are made from durable LDPE (Low-Density Polyethylene) and are engineered to screw directly onto exposed bolt or stud threads. Internally ribbed, these caps cut their own threads during installation to ensure a secure fit. Once installed, they act as a barrier against dirt, moisture, corrosion, and mechanical damage. they are also an effective safety measure, preventing injuries from exposed fasteners and giving your projects a clean, professional finish.

Key Features:

• Manufactured from high-quality LDPE for flexibility and durability
• Self-threading internal ribs for secure attachment to M36-M48 threads
• Hexagonal head for installation with a spanner or wrench
• Excellent resistance to oils, greases, fuels, alcohols, seawater, and non-oxidising chemicals
• Black finish as standard, with custom RAL colours available on request
• Weatherproof seal for outdoor and industrial use
• Available in multiple lengths per thread size

Key Applications and Industries

Thread Protection Caps like ours are trusted across many UK sectors for both protection and compliance with safety standards. They are commonly used in:

• Flanged pipe assemblies
• Street furniture and outdoor lighting systems
• Bridge and infrastructure projects
• Playgrounds and public installations
• Marine engineering and coastal environments
• Road guardrails and safety barriers

Technical Specifications

• Thread size : M42
• Inside Height : 137mm
• Outside Diameter : 94.9mm
• Internal Diameter : 81.9mm
• Nut Height : 51mm
• Lock Nut Suitable : No
• Material: LDPE (Low-Density Polyethylene)
• Temperature Resistance: Constant temperatures up to 70ºC
• Chemical Resistance: Seawater, non-oxidising acids/alkalis, alcohols, fuels, oils, and greases
• Colours: Black (standard); Custom RAL colours available for bulk orders

Benefits:

• Protects exposed threads from corrosion, dirt, and mechanical damage
• Improves visual finish of installations
• Prevents injuries caused by sharp or protruding threads
• Easy to install with standard tools ,no need for additional fasteners or adhesives
• Customisable for branding or colour coding
• Cost-effective solution for industrial protection

Why Buy from Vital Parts?

As a trusted UK supplier of high - quality fasteners and industrial components, Vital Parts offers a customer-first experience with benefits that include:

• Same-Day Dispatch: Fast and reliable shipping to keep your projects on track.
• Competitive Trade Pricing: Enjoy bulk discounts on larger orders to save more.
• Expert Technical Support: Our knowledgeable team is here to help with product selection and application advice.

Whether you're managing infrastructure, fabricating components, or maintaining marine systems, our Self Threading Nut Caps are a reliable choice for thread protection. If you need assistance selecting the right size or would like to discuss custom options, contact our expert team at 01233 713581.