Why buy half nuts from Fixabolt?
Manufactured to DIN 439 for dimensional consistency
Supplied in A2 stainless steel for corrosion resistance
Clean hex form for reliable spanner engagement
Ideal for locking, spacing and adjustment applications
Trade pack quantities for workshop and site use
UK stock with fast, dependable delivery
What half nuts are used for
A thin or half nut is typically used where a full-height nut is unsuitable or unnecessary. Common uses include:
Jam nut or lock nut applications
Securing settings on threaded rod or studs
Spacing and height adjustment
Applications with restricted clearance
Assemblies where weight or profile reduction is required
Stainless steel half nuts are commonly used in fabrication, plant maintenance, marine-adjacent environments, food-safe areas and general exterior installations.
Standards and Materials
These nuts are produced to DIN 439, the widely recognised European standard for hexagon thin nuts.
If you are buying for a precise engineering or specification-led project, you may also see this product referenced under BS 3692, the British Standard covering precision hex nuts, which includes thin and half-height forms.
Fixabolt supplies this range in A2 stainless steel, offering good corrosion resistance for most indoor and outdoor environments. For aggressive or marine conditions, alternative grades may be required depending on specification.
How to choose the right half nut
When selecting a stainless steel thin nut, consider the following:
Thread size: Must match the bolt, stud or threaded rod exactly
Nut height: DIN 439 half nuts are thinner than standard hex nuts and are not intended to replace them where full load-bearing capacity is required
Application: Use as a locking nut, spacer or adjustment nut rather than a primary structural fastener
Environment: A2 stainless steel is suitable for most general-purpose and external uses
If a half nut is being used as a lock nut, it is typically tightened against a standard hex nut to prevent loosening.
Browse by size or related types
This collection covers DIN 439 stainless steel half nuts across common metric thread sizes.
We stock You may also wish to link to related fasteners such as standard hex nuts, threaded rod or full-height lock nut solutions where appropriate.
Trade supply and support
Fixabolt supplies half nuts in A2 stainless steel for trade, maintenance and fabrication customers across the UK.
Trade-friendly pack quantities
Consistent quality and specification
Fast UK delivery
Knowledgeable technical support
If you are unsure whether a DIN 439 half nut is suitable for your application, our team is happy to advise.
FAQs
What is a half nut?
A half nut, also known as a thin nut, is a hex nut with approximately half the height of a standard hex nut. It is commonly used for locking, spacing or adjustment rather than primary load-bearing.
What is DIN 439?
DIN 439 is the European standard that defines the dimensions and tolerances for hexagon thin nuts, often referred to as half nuts.
Are half nuts as strong as standard nuts?
No. Because of their reduced height, half nuts have less thread engagement and are not designed to replace standard hex nuts in structural applications.
What material are Fixabolt half nuts made from?
This range is supplied in A2 stainless steel, providing good corrosion resistance for most general-purpose and outdoor environments. If you need A4, get in touch on our live chat and we'll sort it in minutes.
Can half nuts be used as lock nuts?
Yes. Half nuts are commonly used as jam nuts, tightened against a standard hex nut to help prevent loosening under vibration.
