Bremick | Socket Screw Set Screw

High-Strength Fastening for Machinery & Fabrication

Bremick Socket Screws & Set Screws provide compact, high-strength fastening for machinery, fabrication, maintenance, engineering, manufacturing & industrial assemblies where precise thread fit, strong internal hex drive engagement & controlled head geometry matter.

The Bremick range covers multiple fastening families across Metric, UNC, UNF & BSW threads, with options in high-strength alloy steel, Stainless 304 & Stainless 316.

Key families include:

► Socket Head Cap Screws
► Flat Head Countersunk Socket Screws
► Button Head Socket Screws
► Socket Head Shoulder Screws
► Cup Point Grub Screws
► Knurled Cup Grub Screws
► Low Head Socket Screws
► Metric Socket Screws
► UNC Socket Screws
► UNF Socket Screws
► BSW Socket Screws
► Stainless Socket Screws
► High-Strength Alloy Steel Socket Screws

Quick selection: Application → Head/Point Style → Thread System → Diameter → Pitch/TPI → Length → Property Class → Material → Finish → Hex Drive → Environment

For larger workshop, machinery or production requirements, Trade Support Solutions can support coordinated fastener procurement.

What Are Socket Screws?

Socket screws are threaded fasteners driven through an internal hex recess rather than a conventional external hex head.

Their compact drive geometry makes them particularly useful where:

► Spanner clearance is limited
► Machinery packaging is tight
► High-strength fastening is required
► A recessed drive is preferred
► Head projection needs controlling
► Equipment servicing requires repeatable tool access
► Conventional bolt heads are unsuitable

The category includes both headed socket screws plus headless socket set screws.

That distinction matters because the two groups solve different fastening requirements.

Socket Screws vs Socket Set Screws

Socket Screws generally use an external head plus internal hex drive.

Common styles include:

► Socket Head Cap
► Flat Head Countersunk
► Button Head
► Shoulder
► Low Head

Socket Set Screws are generally headless.

Common Bremick styles include:

► Cup Point Grub Screws
► Knurled Cup Grub Screws

A set screw typically threads into one component until its point contacts another surface.

A headed socket screw normally clamps components through its head plus threaded engagement.

Keeping both intents distinct improves product selection plus prevents unnecessary category overlap.

Why Choose Bremick Socket Screws?

Socket screws provide a flexible fastening platform across compact machinery, fabricated equipment & high-strength assemblies.

Depending on the exact family, benefits can include:

► Strong internal hex drive engagement
► Compact head geometry
► High-strength property classes
► Flush-head options
► Low-profile options
► Precision shoulder geometry
► Headless locking options
► Metric plus imperial threads
► Stainless material options
► Broad machinery compatibility

Bremick’s range spans individual fastener families rather than treating every socket screw as mechanically identical.

The correct choice depends on what the screw needs to do inside the joint.

Common Applications

Bremick Socket Screws can suit specified fastening across:

► Industrial machinery
► Manufacturing equipment
► CNC equipment
► Pumps
► Motors
► Automation systems
► Fabrication
► Machine guards
► Equipment frames
► Jigs
► Fixtures
► Shaft assemblies
► Hubs
► Collars
► Workshop repairs
► Maintenance replacement

For practical background across wider fastening systems, Industrial Shed’s Fastener Guide: Bolts, Screws & Anchors provides useful trade guidance.

Product Selection Guide – Start With the Fastening Function

The strongest selection sequence is:

Application → Head/Point Style → Thread → Diameter → Pitch/TPI → Length → Strength → Material → Finish → Drive Size

Before ordering, confirm:

► What the screw needs to do
► Required head or point geometry
► Metric or imperial thread
► Nominal diameter
► Pitch or TPI
► Required length
► Property class
► Material
► Surface finish
► Internal hex size
► Environmental exposure

Do not start from diameter alone.

Two screws with the same nominal diameter can differ completely in thread, head geometry, strength class plus application.

Socket Head Cap Screws

Socket Head Cap Screws use a cylindrical head with an internal hex drive.

They are a core machinery-fastening style where strong drive engagement plus compact external dimensions are required.

Bremick’s live range includes Socket Head Cap families across:

► Metric Class 12.9
► Metric Stainless 304
► Metric Stainless 316
► Imperial UNC / UNF
► Imperial BSW
► Imperial Stainless 304
► Imperial Stainless 316

Typical applications can include:

► Machinery frames
► Equipment housings
► Jigs
► Fixtures
► Brackets
► Industrial assemblies

Socket Head Cap Screws should retain their own child-page intent around high-strength cylindrical-head machinery fastening.

Flat Head Countersunk Socket Screws

Flat Head Countersunk Socket Screws are designed to seat into a matching countersink.

This allows the installed head to sit flush or close to flush with the surrounding surface.

Bremick’s range includes:

► Metric Class 10.9
► Metric Stainless 304
► Metric Stainless 316
► Imperial BSW / UNC / UNF
► Imperial Stainless 304

Use countersunk geometry where flush seating is required.

Do not use a countersunk fastener against a flat bearing surface unless the joint is designed for that head style.

Button Head Socket Screws

Button Head Socket Screws use a low rounded head with internal hex drive.

They can suit assemblies requiring:

► Reduced head projection
► Smooth external profile
► Wider head bearing area
► Compact machinery fastening

Bremick lists Button Head variants across:

► Metric Class 10.9
► Metric Stainless 304
► Metric Stainless 316
► Imperial BSW / UNC / UNF
► Imperial Stainless 304

Button Head should remain separate from countersunk plus conventional cap-screw intent.

Low Head Socket Screws

Low Head Socket Screws reduce vertical head height where clearance is restricted.

They can suit:

► Tight machinery spaces
► Compact equipment
► Guards
► Covers
► Low-clearance brackets

Reduced head height can affect fastener capability.

Do not assume a Low Head Socket Screw has identical mechanical performance to a standard Socket Head Cap Screw of the same diameter.

Socket Head Shoulder Screws

Shoulder Screws include a defined unthreaded shoulder plus a smaller threaded section.

Their geometry can support:

► Pivots
► Rollers
► Linkages
► Guides
► Sliding components
► Locating functions

Bremick’s live category includes:

► Metric Class 12.9 Shoulder Screws
► Imperial BSW / UNC Shoulder Screws

When selecting a shoulder screw, check:

► Shoulder diameter
► Shoulder length
► Thread diameter
► Thread length
► Application clearance

The shoulder itself is a functional machine element rather than simply extra fastener material.

Cup Point Grub Screws

Cup Point Grub Screws are headless socket set screws designed to contact a mating component through a cup-style point.

Common applications include:

► Shaft locking
► Collar positioning
► Hub retention
► Pulley retention
► Knob fastening
► Machinery adjustment

Bremick’s range covers Metric plus imperial Cup Point families across high-strength alloy steel plus stainless options.

Point style should remain part of the purchase specification.

Knurled Cup Grub Screws

Knurled Cup Grub Screws use a textured cup-point interface for stronger mechanical interaction with the contacted surface.

They can suit:

► Shaft retention
► Hub locking
► Component positioning
► Machinery adjustment
► Equipment retention

Knurled Cup should not be merged with standard Cup Point intent.

The point geometry changes how the screw interacts with the mating surface.

Cup Point vs Knurled Cup

Cup Point

► Conventional cup contact
► General machinery locking
► Broad set-screw applications

Knurled Cup

► Textured cup contact
► Stronger gripping behaviour
► Secure positioning intent
► Greater potential for surface marking

Select the point around the machinery requirement rather than thread fit alone.

Metric Socket Screws

Bremick offers extensive Metric socket screw coverage.

Depending on head style, the live category includes:

► Class 12.9
► Class 10.9
► High-strength grub-screw classes
► Stainless 304
► Stainless 316

For Metric products, confirm:

Diameter + Pitch + Length + Head Style + Property Class + Material

Common Metric applications include machinery, manufacturing, equipment servicing, fabrication plus industrial assembly.

UNC Socket Screws

UNC uses Unified National Coarse threads.

Bremick lists UNC variants across several Socket Screw families.

UNC may appear across:

► Imported equipment
► Industrial machinery
► Existing imperial assemblies
► Workshop repairs
► Legacy equipment

Confirm diameter plus TPI before ordering.

UNF Socket Screws

UNF uses Unified National Fine threading.

A UNF fastener can share the same nominal diameter as a UNC fastener while using a different pitch.

That means:

same diameter ≠ compatible thread

Verify the original machinery specification, use a thread gauge or identify TPI before replacement.

BSW Socket Screws

BSW uses British Standard Whitworth threading.

It remains relevant across:

► Legacy machinery
► Older industrial equipment
► Existing British-derived assemblies
► Maintenance replacement

BSW should remain separate from UNC plus UNF.

Never identify an imperial socket screw solely from outside diameter.

Metric vs Imperial Socket Screws

Workshops handling mixed machinery need disciplined thread identification.

Metric

► Diameter expressed in millimetres
► Pitch expressed in millimetres
► Metric hex tooling

UNC / UNF / BSW

► Imperial diameter
► Pitch commonly identified through TPI
► Imperial hex tooling on applicable products

Keep Metric plus imperial hardware in clearly separated storage.

The cost of checking the thread first is far lower than repairing damaged tapped holes.

Alloy Steel Socket Screws

Alloy Steel socket screws are commonly used where high mechanical strength is required.

Bremick’s parent range includes high-strength classes such as:

► Class 12.9
► Class 10.9
► High-strength grub-screw specifications

The exact property class depends on product family.

Do not assume every Plain/Black socket screw carries the same strength class.

Colour is not a mechanical specification.

Stainless 304 Socket Screws

Stainless 304 can suit many corrosion-resistant workshop, fabrication plus industrial applications.

Bremick offers Stainless 304 across multiple Socket Screw families.

Potential selection reasons include:

► General corrosion resistance
► Stainless fabrication
► Internal equipment
► Clean machinery environments
► Moisture resistance where 304 is suitable

Strength still depends on the exact product specification.

Stainless material should not be used as a substitute for checking mechanical requirements.

Stainless 316 Socket Screws

Stainless 316 provides stronger corrosion-resistance intent where environmental exposure becomes more demanding.

Applications can include:

► External machinery
► Coastal installations
► Marine-influenced environments
► Wet equipment
► Corrosion-sensitive fabrication

Material choice should account for the full environment plus mating hardware.

Alloy Steel vs Stainless Socket Screws

Alloy Steel

► High-strength machinery fastening
► Property-class driven
► Corrosion performance depends on finish

Stainless 304

► General corrosion-resistant stainless
► Broad machinery plus fabrication use

Stainless 316

► Higher corrosion-resistance intent
► Stronger coastal plus marine relevance

The best material is the one satisfying both the mechanical requirement plus environmental exposure.

Plain, Zinc & Stainless Selection

Finish matters.

Plain / Black / Natural

► No durable applied corrosion coating
► Common across high-strength alloy-steel fasteners
► Best suited to controlled environments unless separately protected

Zinc

► Applied protective finish
► Greater corrosion resistance than uncoated steel
► Suitability depends on exposure

Stainless 304

► Corrosion protection comes from the stainless material itself

Stainless 316

► Greater corrosion-resistance intent for demanding environments

Do not select finish from appearance alone.

Internal Hex Drive Selection

The internal hex recess is the primary tightening interface.

Correct tooling helps:

► Transfer installation force
► Protect the socket
► Reduce rounding
► Improve removal
► Maintain serviceability

Before installation:

► Confirm drive size
► Clean the recess
► Inspect the key or bit
► Insert fully
► Keep the tool square

Rounded socket drives can make removal significantly harder.

For workshops relying heavily on internal-drive fasteners, Tool & Equipment Care can support broader equipment maintenance requirements.

Metric vs Imperial Hex Keys

Do not use near-size Metric keys on imperial screws or near-size imperial keys on Metric screws.

A key can appear to fit under light force while damaging the recess during tightening.

Use:

► Metric key for Metric drive
► Correct imperial key for imperial drive

Replace rounded or worn hex keys.

Blind-Hole Installation

Socket screws are frequently installed into blind tapped holes.

Check:

► Hole depth
► Thread depth
► Screw length
► Debris
► Bottom clearance
► Thread condition

A screw can bottom inside the hole before it clamps the component.

That can create false tightening feedback.

Clean blind holes plus confirm usable depth before installation.

Thread Engagement

Adequate thread engagement depends on:

► Screw diameter
► Female-thread material
► Screw property class
► Joint loading
► Thread condition
► Application design

A high-strength screw installed into weak or damaged female threads can still produce an unreliable connection.

Treat both sides of the threaded joint as part of the fastening system.

Stainless Galling

Stainless threaded assemblies can gall during tightening.

Risk can increase through:

► High installation speed
► Dirty threads
► Damaged threads
► Misalignment
► Excess friction
► Stainless-on-stainless contact

Good practice can include:

► Clean threads
► Controlled tightening speed
► Correct alignment
► Suitable lubricant where specified
► Proper thread engagement

Lubrication changes torque behaviour.

For critical joints, use the tightening procedure specified for the actual fastener plus joint condition.

Installation Checks

Before tightening:

► Confirm head or point style
► Confirm Metric / UNC / UNF / BSW
► Confirm diameter
► Confirm pitch or TPI
► Confirm length
► Confirm property class
► Confirm material
► Confirm finish
► Inspect threads
► Inspect drive recess
► Select the correct hex tool
► Check female thread
► Check environmental suitability

Start the fastener manually where practical.

If engagement becomes difficult immediately:

► Stop
► Remove the screw
► Verify thread system
► Verify pitch
► Inspect threads
► Check alignment

Do not force mismatched threads with powered tooling.

Torque Depends on the Exact Socket Screw

There is no responsible universal torque figure for the entire Socket Screw category.

Required tightening can vary with:

► Diameter
► Pitch
► Property class
► Head geometry
► Material
► Finish
► Lubrication
► Female-thread material
► Joint design

Use the correct technical information for the specific fastener.

Avoid These Socket Screw Mistakes

Choosing by diameter alone.
Confirm pitch or TPI.

Mixing Metric plus imperial threads.
They are not interchangeable.

Treating all black socket screws as Class 12.9.
Verify the property class.

Using countersunk heads on flat seats.
Match the head to the mating geometry.

Using standard heads where clearance requires Low Head.
Choose geometry first.

Treating Cup Point plus Knurled Cup as identical.
Point geometry changes surface interaction.

Using the wrong hex key.
Protect the internal drive.

Ignoring blind-hole depth.
Bottoming can prevent clamping.

Assuming stainless automatically means high strength.
Check the mechanical specification.

Ignoring stainless galling.
Control thread condition plus installation.

Expert Tips for Fitters, Machinists & Maintenance Crews

Identify the function first.
Decide whether the fastener clamps, sits flush, pivots, locks or locates.

Write the complete specification.
Use head style + thread + diameter + pitch/TPI + length + property class + material.

Keep Metric plus imperial stock separated.
Thread mix-ups can damage expensive machinery.

Keep point styles separated.
Cup Point plus Knurled Cup serve different functions.

Inspect hex tooling regularly.
A worn key can damage multiple screws in one job.

Check blind holes before repetitive assembly.
One contaminated tapped hole can create misleading tightening behaviour.

Control stainless installation speed.
This helps manage galling risk.

For repeat workshop or production requirements, Same Day Dispatch can help with eligible stocked products required against active deadlines.