Socket Set (Grub)

Not sure what size or thread you have or need?

Two ways to confirm before you order - whichever you already know about your fastener.

1If you know the fastener diameter

2If you have the Allen key

Match your Allen / hex key AF (across-flats) to the screw size it fits. Our reference chart covers every metric and imperial size we stock.

Open the Allen key size chart ›

Grub screws — also called socket set screws or simply set screws — are fully headless fasteners with an internal hex socket drive. Because they have no head, they can be screwed entirely below a surface or flush with a component face, making them essential for locking components onto rotating shafts without any protruding head to create a hazard or interference.

Primary applications include locking shaft collars, pulleys, sprockets, gears, knobs and handles onto shafts — the grub screw threads into the collar or hub wall and bears against the shaft to fix the component in position. Also used in adjustment mechanisms, depth stops and clamping applications.

POINT STYLES

Cup Point — The most common. A concave cup-shaped tip that bites into the shaft surface for a positive, bite-in grip. Good for permanent or semi-permanent installations on soft metals, plastics and hardened shafts.

Flat Point — A flat, blunt tip for use on hardened or polished shafts where shaft damage must be avoided. Lower holding force than cup point but shaft surface is protected.

Cone Point — A sharp conical tip for permanent installations into softer shaft materials. High grip but causes shaft surface damage — use only where the shaft will not be reused.

Dog Point — A short cylindrical pilot stub on the tip. Fits into a matching drilled recess in the shaft for positive mechanical location with no shaft damage and repeated assembly capability.

GRADES AND MATERIALS

Class 12.9 Black (plain finish) — Highest strength grade. Unfinished bare steel, no corrosion protection. The most common grub screw grade for general mechanical and industrial applications.

Class 12.9 Zinc Plated — Same high strength with a bright silver zinc finish for light corrosion protection in dry environments.

A2-70 G304 Stainless — For applications requiring corrosion resistance. Largely non-magnetic — A small degree of work-hardening magnetism is normal.

WHY AUSTRALIA TRUSTS BOLT & NUT

With 15+ years selling fasteners online from Brisbane, we hold over 25,000 stock lines and 200 million pieces — 98.75% of online orders placed before 1pm leave same day. Save more as you buy more — we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right socket screw.

Free shipping

In stock

#3-48 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (0.050" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#3-48 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (0.050" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#4-40 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (0.050" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#4-40 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (0.050" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#4-48 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (0.050" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#5-40 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (1/16" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#5-40 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (1/16" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#5-44 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (1/16" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#6-32 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (1/16" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#6-32 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (1/16" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#6-40 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (1/16" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#8-32 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (5/64" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#8-32 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (5/64" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#8-36 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (5/64" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#10-24 (3/16") x 24 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (3/32" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#10-24 (3/16") x 24 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (3/32" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#10-32 (3/16") x 32 TPI UNF Fine Stainless A2-70 G304 Cup Point Socket (3/32" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

#10-32 (3/16") x 32 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (3/32" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

1/4" x 20 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (1/8" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

1/4" x 20 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (1/8" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

1/4" x 28 TPI UNF Fine Stainless A2-70 G304 Cup Point Socket (1/8" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

1/4" x 28 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (1/8" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

5/16" x 18 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (5/32" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

5/16" x 18 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (5/32" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

5/16" x 24 TPI UNF Fine Stainless A2-70 G304 Cup Point Socket (5/32" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

5/16" x 24 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (5/32" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

3/8" x 16 TPI UNC Coarse Stainless A2-70 G304 Cup Point Socket (3/16" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

3/8" x 16 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (3/16" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

3/8" x 24 TPI UNF Fine Stainless A2-70 G304 Cup Point Socket (3/16" Key) Set Screws Grub ANSI B18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

3/8" x 24 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (3/16" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

7/16" x 14 TPI UNC Coarse Plain Black Uncoated Grade 14.9 Cup Point Socket (7/32" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified
Free shipping

In stock

7/16" x 20 TPI UNF Fine Plain Black Uncoated Grade 14.9 Cup Point Socket (7/32" Key) Set Screws Grub Grade 14.9 ANSI B 18.3
As low as each

Length Overall

Total =

Discount of % applied

SKU:

No. of Screws
- +

Min buy qty is:

View Specs Sold Out - Click to be notified

A headless screw threaded end to end with an internal hex (Allen) socket, driven below the surface to lock collars, gears and pulleys onto a shaft. Cup, cone, flat and dog points, in stainless and high-tensile carbon.

TECHNICAL RESOURCES

Need help identifying your socket screw? Check the Allen key sizes for socket products, or our thread size identification guide.

For full sizing data and standards, see our Technical PDFs library.