Attributes

Brand	-
Category	Standard Parts, Components & Industrial Consumables / Screws
Origin	-
Material	Alloy Steel
Hardness Grade	12.9 (High Tensile)
Point Type	Cup Point
Drive Style	Hex Socket (Allen)
Head Style	Headless (Grub Screw)
Thread Standard	Metric (ISO)
Available Sizes	M2, M3, M4, M5, M6, M8, up to M24
Surface Finish	Black Oxide
Application	Securing collars, gears, and pulleys to shafts
Package Quantity	100 pieces per box

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Good quality, slightly brittle

The tensile strength is definitely there, but because they are so hard, you have to be careful not to overtighten or they might snap. As long as you use a torque driver, they are fantastic.

Anonymous

Mar 27, 2026

Rating: 5/5

Best seller for a reason

We order these in bulk for our assembly line. The consistency in thread quality and head dimensions is excellent. The cup point bites into the shaft securely without damaging it excessively.

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect fit for machinery repair

Needed specific M4 cup point screws for a lathe repair. These Grade 12.9 screws fit perfectly and provided the necessary clamping force. Fast shipping and great packaging.

Anonymous

Mar 18, 2026

Rating: 5/5

Excellent hardness for industrial use

These screws are incredibly strong. I used the M6 size to secure a gear on a high-torque motor shaft, and they haven't slipped once. The hex socket is deep and well-formed, so my Allen keys don't strip them.

Anonymous

Mar 17, 2026

Rating: 5/5

Reliable grub screws

Used the M8 size for a automotive application. They held up under vibration and heat better than the standard grade 8.8 screws I was using before. Highly recommended.

Anonymous

Mar 01, 2026

Rating: 5/5

Great value pack

Having a variety of sizes available in one listing made it easy to stock up for various projects. The black oxide finish looks professional and offers decent corrosion resistance.

5 FAQ

Q: What is the exact hex key size required for the M5 screw?

A: For the M5 Hex Socket Set Screw, you will need a 2.5mm Allen key. We recommend using high-quality tools to prevent stripping the socket.

Q: Do these come with a locking patch or thread locker applied?

A: No, these screws do not come with a pre-applied locking patch. We recommend applying a medium-strength thread locker like Loctite 243 if your application involves high vibration.

Q: Are these screws suitable for stainless steel shafts?

A: Yes, the cup point design is effective on stainless steel shafts. However, due to the high hardness of Grade 12.9, ensure the shaft material is compatible to avoid galling.

Q: Can I use these in outdoor environments?

A: These screws feature a black oxide finish which provides mild corrosion resistance. For harsh outdoor or marine environments, we suggest applying additional grease or considering stainless steel alternatives.

Q: Is the thread pitch standard coarse for all listed sizes?

A: Yes, all sizes from M2 to M24 in this listing feature standard ISO metric coarse threads unless otherwise specified in a custom order.

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