Strong Fully Threaded Fastening for Machinery & Fabrication
A compact bolted joint can need high tensile strength without needing an unthreaded shank. Bremick High Tensile Set Screws provide Australian fabricators, mechanics, maintenance crews & industrial buyers with Class 8.8 metric hex set screws for machinery, equipment, steel fabrication, brackets & mechanical repairs.
These fully threaded high tensile set screws combine an external hex head with thread extending along the shank, making them useful where the assembly requires thread availability across the fastener length. Compare related fastening configurations through Hex Bolts, or browse Nuts & Washers when matching the surrounding bolted assembly.
Diameter alone doesn't identify the right fastener. Metric thread size, pitch, length, Class 8.8 property class, finish, mating hardware & the material stack should all be checked before a set screw goes into the joint.
What Are High Tensile Set Screws?
High tensile set screws are fully threaded fasteners designed for bolted connections requiring a higher-strength fastening option. Unlike many longer hex bolts with an unthreaded section beneath the head, a hex set screw carries thread along its shank.
Bremick's relevant range includes Class 8.8 metric hexagon head set screws, with zinc-plated options available across multiple dimensions.
Common trade & purchasing terms include:
► High tensile set screws
► High tensile hex set screws
► Hex set screws
► Metric set screws
► Class 8.8 set screws
► Grade 8.8 set screws
► Fully threaded set screws
► Fully threaded high tensile screws
► Zinc plated set screws
► Metric hex set screws
► High tensile screws
Full threading changes how the fastener can sit within an assembly. It allows the mating nut or threaded component to engage at different positions along the available shank, which can be useful across compact brackets, plates & machinery components.
That doesn't mean a set screw should automatically replace a partially threaded bolt. Where an existing assembly relies on a particular shank, thread or bearing arrangement, the replacement should follow the requirements of that joint.
For a broader explanation of common fastening families, Fastener Guide Bolts Screws Anchors provides practical background for Australian trade buyers.
Why Choose High Tensile Set Screws?
Higher-strength fastening becomes relevant when the assembly calls for a defined metric property class rather than a general-purpose fastener.
Class 8.8 identifies a metric high tensile fastener property class. It should not be confused with imperial Grade 8, which belongs to a different grading system.
High tensile hex set screws can be useful where the specified assembly requires:
► Class 8.8 metric fastening
► Full threading along the shank
► External hex-head access
► Compact bolted connections
► Machinery assembly
► Equipment repairs
► Steel fabrication
► Bracket installation
► Mechanical maintenance
► Replacement of matching specified fasteners
A fully threaded shank can be particularly useful through relatively thin material stacks. Plates, brackets, washers & nuts can be positioned without an unthreaded section occupying part of the joint.
The fastener still works as one component of a complete connection. Mating nut properties, washer arrangement, thread engagement, material condition & the requirements of the equipment or assembly all need consideration.
Where a job calls for other high-strength or specialised bolting, Structural Fasteners & Bolts provides another relevant fastening pathway.
Common Applications
A replacement bracket on workshop machinery is a typical example of where fastener configuration matters as much as strength. The connection may combine relatively thin steel components while still requiring a high tensile metric fastener with usable thread along the shank.
Bremick high tensile set screws can be relevant for:
► Machinery brackets & mounting points
► Fabricated steel assemblies
► Workshop equipment repairs
► Agricultural machinery maintenance
► Automotive & mechanical repairs
► Guards & mounting plates
► Equipment frames
► Industrial maintenance
► Plant repairs
► Production equipment
► General metal fabrication
► Replacement fastening
Fabricators often select set screws by diameter × length once the thread specification has been established. The correct combination depends on the holes, material stack, mating hardware & required engagement rather than whichever fastener happens to be closest in the parts bin.
Field maintenance creates a different challenge. An old fastener may be dirty, corroded or previously replaced, so the component coming out of the machine shouldn't automatically be assumed to match the original equipment specification.
Agricultural & industrial equipment can also accumulate a mixture of fastening systems over years of repairs. Confirming whether the connection is genuinely metric before installing a new Class 8.8 set screw helps protect the mating threads.
For a practical look at maintenance in demanding equipment environments, Quarry Crews Crusher Maintenance provides additional workshop context.
Product Selection Guide
The useful purchasing sequence is straightforward: thread first, length second, property class third & finish fourth.
Confirm The Metric Thread
Start with the component the set screw must actually engage.
Check:
► Nominal metric diameter
► Thread pitch
► Mating nut or tapped hole
► Existing thread condition
► Original fastener specification where available
A screw that begins binding after only a small amount of engagement shouldn't simply be driven harder. Stop & confirm that the diameter & pitch actually correspond.
For dimensional identification during replacement work, Calipers (Digital / Manual) can assist with checking unfamiliar hardware.
Choose Diameter × Length
Once the thread is known, match the fastener length to the assembled components.
Allow for:
► Plate thickness
► Bracket thickness
► Washer thickness
► Nut position
► Required engagement
► Available clearance beyond the joint
Unnecessary projection can interfere with nearby equipment, while insufficient length can leave the connection without the engagement required by its specification.
Verify Class 8.8
A familiar hex head tells you very little about the mechanical properties underneath it.
Check the required property class before replacing existing hardware. Metric Class 8.8 is not the same designation as imperial Grade 8, despite the similarity in their names.
Where a compatible metric nut is required, browse Hex Nut.
Match The Finish To The Exposure
Fastener strength & corrosion protection answer different questions.
Zinc-plated high tensile set screws can suit many protected machinery, fabrication & workshop applications, but the service environment should determine whether that finish is appropriate.
Consider exposure to:
► Indoor workshop conditions
► Moisture
► Outdoor weather
► Washdown
► Chemicals or contaminants
► Coastal environments
► Dissimilar materials
Don't assume a zinc-plated finish is suitable for every external or corrosive application.
Expert Tips
Keep the removed fastener on the bench until its replacement has been positively identified.
► Record diameter, pitch, length, property class & finish
► Check whether the original shank is fully threaded
► Inspect head markings before cleaning or discarding the fastener
► Examine mating nuts & tapped holes for thread damage
► Check the surrounding material for wear or deformation
► Don't confuse Class 8.8 with imperial Grade 8
► Include washers when measuring the assembled stack
► Start clean threads carefully to detect mismatch early
► Avoid forcing a fastener that doesn't engage normally
► Follow the tightening requirements of the specific assembly rather than inventing a value from fastener size
The mating hardware deserves the same inspection as the new screw. A fresh Class 8.8 set screw cannot repair a damaged nut, crossed thread or worn tapped hole.
Where the specified assembly requires an appropriate bearing washer, Flat Washer provides related options. Washer selection should follow the requirements of the connection rather than being added automatically.
External hex heads also require suitable installation tooling. Spanner & Wrench Sets provides a complementary pathway for workshop assembly & maintenance work.
The importance of treating the fastener, mating hardware & driving tool as a complete working system is explored in Why Good Fasteners Matter More Than the Tool You Drive Them With.
