Description

AM Steel Allen Grub Screws – Cone Point are headless set screws driven entirely by an internal hexagon (Allen) socket, with a sharp, tapered conical point at the working end. Manufactured under the AM Steel brand to DIN 914 (ISO 4027), these socket set screws (widely known as grub screws or cone point set screws) are the set screw of choice for permanent or semi-permanent shaft location, where the sharp cone penetrates into the shaft surface to create the strongest resistance to rotation and axial movement of any standard point type.

Because the cone point digs deep rather than merely biting the surface, AM Steel cone point grub screws are well suited to permanent settings of pulleys, gears, sprockets, collars, and couplings onto shafts, and to precision positioning where the point locates into a matching spotted or drilled recess for exact, repeatable location. The deep penetration gives maximum holding power and excellent resistance to vibration loosening, making cone point the preferred choice where a component is set once and not routinely removed. The internal hex socket allows controlled, high-torque tightening deep inside a bore or recess with a standard Allen key or hex bit. AM Steel cone point grub screws are available in high-tensile alloy steel (typically grade 45H, in a black oxide or plain finish) for maximum hardness and penetration, and in stainless steel (A2/304 and A4/316, the latter considered marine-grade) for outdoor, hygienic, or corrosion-prone environments.

Whether you’re permanently setting a pulley or gear onto a drive shaft, locating a collar or coupling for exact positioning, or handling any assembly that needs the highest-holding, vibration-resistant set screw, AM Steel cone point grub screws deliver the deep-penetrating grip, controlled torque, and consistent quality needed for permanent shaft-locking and precision-location applications. As with all AM Steel products, this grub screw is available in a range of metric sizes (typically M3 to M12 per DIN 914, lengths from 3mm to 30mm), in multiple grades, materials, and finishes to suit both industrial-grade and everyday fastening needs.

Key features:

• Headless (set screw) design that sits flush inside a tapped hole with nothing protruding
• Sharp, tapered cone point that penetrates deep into the shaft for maximum holding power
• Excellent resistance to vibration loosening, ideal for permanent or semi-permanent settings
• Locates precisely into a matching spotted or drilled recess for exact, repeatable positioning
• Internal hexagon (Allen) socket for controlled, high-torque tightening in bores and recesses
• Manufactured to DIN 914 / ISO 4027 dimensional standards
• Available in high-tensile alloy steel (grade 45H) and stainless steel (A2/304, A4/316)
• Backed by the quality assurance of AM Steel

Ideal For

AM Steel Allen Grub Screws – Cone Point are ideal for:

• Machine builders permanently setting pulleys, gears, sprockets, and couplings onto drive shafts
• Precision positioning where the cone locates into a spotted or drilled recess for exact, repeatable location
• High-vibration drive assemblies needing maximum resistance to loosening and axial slip
• Fabricators setting components onto shafts that will not be routinely removed or adjusted
• General machinery and equipment assembly requiring the highest-holding standard set screw

Choosing the Right Allen Grub Screw – Cone Point

Selecting the correct cone point grub screw from the AM Steel range depends on several factors:

• Material – Stainless steel (A2/304 or A4/316) for outdoor, hygienic, or corrosion-prone applications; high-tensile alloy steel (grade 45H) for maximum hardness and penetration in general machinery.
• Point Type Suitability – Cone point is the choice for permanent, high-holding, vibration-resistant location; consider a cup point for general adjustable locking, a flat point for minimal marring, or a dog point for locating into a hole or slot.
• Shaft Preparation – For best results, tighten the cone into a matching spot-drilled or dimpled recess in the shaft; this maximizes penetration, holding power, and location accuracy.
• Size & Length – Choose a diameter matching the tapped hole and a length that seats fully without bottoming out or protruding, factoring in the depth of the bore.
• Thread Fit – Confirm coarse or fine metric thread compatibility with the tapped hole in the collar, hub, or component.
• Drive Size – Ensure the Allen key or hex bit matches the internal socket and can reach fully into the bore or recess.

Strategies to Choose the Right Product

• Use cone point for permanent, high-hold settings – Its deep penetration gives the strongest resistance to rotation, axial slip, and vibration of any standard point – best where a component is set once and not routinely removed.
• Spot-drill the shaft for precision location – Tightening the cone into a matching drilled or dimpled recess maximizes holding power and gives exact, repeatable positioning.
• Match material to environment – Use stainless steel (A2/304 or A4/316) for outdoor, washdown, or coastal work; alloy steel (45H) for maximum penetration in general dry machinery.
• Check the thread pitch – Confirm coarse or fine metric thread to ensure a correct match with the tapped hole in the hub or collar.
• Prioritize certified standards – Look for DIN 914 / ISO 4027 compliance for guaranteed dimensional and hardness consistency.
• Consider bulk vs. individual packs – Bulk packs suit production machine assembly and repeat builds; smaller packs suit repairs, servicing, or single jobs.

Mechanical Properties

AM Steel Allen Grub Screws – Cone Point are manufactured to meet recognized mechanical and dimensional standards, ensuring reliability across permanent shaft-locking, precision-location, and general machine-assembly applications:

These mechanical ratings confirm that AM Steel cone point grub screws deliver the deepest-penetrating, highest-holding shaft-locking performance suited to permanent-setting and precision-location applications – tighten into a matching spot-drilled recess for maximum holding power.

Frequently Asked Questions (FAQs)

1. What is a cone point grub screw used for?
It’s used to permanently or semi-permanently lock a component – a pulley, gear, collar, or coupling – onto a shaft, with its sharp cone point penetrating deep into the shaft for maximum resistance to rotation and axial slip, driven flush by an internal hex socket.

2. What is a grub screw?
A grub screw is a headless set screw driven entirely by an internal hexagon (Allen) socket; it sits flush inside a tapped hole and grips via its point rather than clamping under a head, so nothing protrudes.

3. What is a cone point and when should I use it?
A cone point is a sharp, tapered tip that digs deep into the shaft; use it where you need the strongest, most vibration-resistant hold and the component will be set permanently rather than routinely adjusted.

4. What’s the difference between a cone point and a cup point grub screw?
A cone point penetrates deep for a permanent, highest-holding lock, while a cup point bites the surface with a sharp ring for general-purpose, adjustable locking – cone is for set-and-leave, cup is the everyday choice.

5. Are AM Steel cone point grub screws different from generic ones?
AM Steel grub screws are manufactured and quality-tested under the AM Steel brand, ensuring consistent hardness, point geometry, socket dimensions, and finish across every batch, per DIN 914 / ISO 4027.

6. Should I spot-drill the shaft before using a cone point grub screw?
For maximum holding power and precise location, yes – tightening the cone into a matching spot-drilled or dimpled recess lets the point penetrate fully and gives exact, repeatable positioning.

7. What sizes do cone point grub screws come in?
AM Steel cone point grub screws are available in a range of sizes, typically M3 to M12 in metric, with lengths from 3mm to 30mm, per DIN 914.

8. What tool do I need to install a cone point grub screw?
An Allen key (hex key) or hex bit matching the internal socket size is used, since grub screws are driven entirely through an internal hexagon socket rather than an external head.

9. Are cone point grub screws corrosion-resistant?
Yes, especially AM Steel stainless steel versions (A2/304 or A4/316), which resist rust in outdoor, hygienic, or coastal environments; black oxide alloy steel offers basic protection for indoor and dry conditions.

10. Can cone point grub screws be reused?
They can be removed and reinstalled, but because the sharp cone penetrates deep and can mark the shaft, repeated repositioning is less clean than with a flat or cup point; for permanent settings, reuse in the exact same recess is best.

11. What grade are alloy steel cone point grub screws?
AM Steel alloy steel grub screws are typically supplied to grade 45H – a hardened set-screw grade that gives the cone point the hardness needed to penetrate a shaft without deforming.

12. Do cone point grub screws come in coarse and fine thread?
Yes, they are commonly available in both coarse and fine metric thread pitches – confirm the required pitch to ensure a correct match with the tapped hole in the hub or collar.

13. What’s the difference between A2 and A4 stainless steel grub screws?
A2 (304) stainless offers good general corrosion resistance for most indoor and outdoor use, while A4 (316), considered marine-grade, provides superior resistance to chlorides and coastal or chemical environments.