Description

AM Steel Allen Grub Screws – Dog Point are headless set screws driven entirely by an internal hexagon (Allen) socket, with a protruding, unthreaded cylindrical tip – the “dog” – at the working end. Manufactured under the AM Steel brand to DIN 915 (ISO 4028), these socket set screws (widely known as grub screws or dog point set screws) are the set screw of choice wherever a fastener must locate into a matching hole, slot, groove, or keyway rather than simply clamp against a surface – providing precise positioning, alignment, and rotational location.

Because the dog tip engages into a mating recess rather than biting the surface, AM Steel dog point grub screws are well suited to locating and aligning components, acting as an adjustable stop, guide, or pivot, and setting a part into a drilled hole, slot, or keyway for exact, repeatable positioning. The protruding tip carries shear load and keys the component in place, resisting rotation strongly while leaving the mating surface undamaged. The dog point also suits use where the set screw must engage a groove on a shaft to permit axial location while preventing rotation. 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 dog point grub screws are available in high-tensile alloy steel (typically grade 45H, in a black oxide or plain finish) for hardness and durability, and in stainless steel (A2/304 and A4/316, the latter considered marine-grade) for outdoor, hygienic, or corrosion-prone environments.

Whether you’re locating and aligning components, setting a stop or pivot, keying a part into a slot or drilled hole, or handling any assembly that needs precise positioning with strong rotational location, AM Steel dog point grub screws deliver the accurate engagement, controlled torque, and consistent quality needed for locating and alignment set-screw applications. As with all AM Steel products, this grub screw is available in a range of metric sizes (typically M3 to M12 per DIN 915, lengths from 4mm 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 only the dog tip protruding
• Protruding, unthreaded cylindrical dog tip that locates into a matching hole, slot, or keyway
• Provides precise positioning, alignment, and strong rotational location
• Ideal as an adjustable stop, guide, or pivot, or for keying a part into a groove
• Internal hexagon (Allen) socket for controlled, high-torque tightening in bores and recesses
• Manufactured to DIN 915 / ISO 4028 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 – Dog Point are ideal for:

• Machine builders locating and aligning components into a matching hole, slot, or keyway
• Setting an adjustable stop, guide, or pivot where the dog tip carries shear load and fixes position
• Keying a part onto a shaft groove to allow axial location while preventing rotation
• Precision positioning where exact, repeatable alignment matters more than surface clamping
• General machinery and equipment assembly requiring strong rotational location without marring the mating surface

Choosing the Right Allen Grub Screw – Dog Point

Selecting the correct dog 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 hardness and durability in general machinery.
• Point Type Suitability – Dog point is the choice for locating into a hole, slot, or keyway; consider a cup point for general biting grip, a cone point for permanent high-hold location, or a flat point for non-marring clamping.
• Mating Recess – Ensure a correctly sized and positioned hole, slot, or groove is prepared for the dog tip to engage; the fit between the dog and recess governs location accuracy.
• Dog Length – Dog point is available in short-dog and long-dog variants; choose the tip length to suit the depth of the mating recess and the shear load required.
• Size & Length – Choose a diameter matching the tapped hole and an overall length that seats fully with the dog engaging correctly, 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.

Strategies to Choose the Right Product

• Use dog point for locating, not just clamping – When the job is precise alignment or rotational location, the dog tip engaging a matching hole or slot gives accurate, repeatable positioning that a plain point can’t.
• Prepare the mating recess accurately – The fit of the dog into its hole, slot, or groove governs location precision, so size and position the recess to match the dog diameter.
• Choose short-dog or long-dog to suit the recess – Match the protruding tip length to the depth of the mating hole or slot and the shear load the location must carry.
• Match material to environment – Use stainless steel (A2/304 or A4/316) for outdoor, washdown, or coastal work; alloy steel (45H) for hardness and durability in general dry machinery.
• Prioritize certified standards – Look for DIN 915 / ISO 4028 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 – Dog Point are manufactured to meet recognized mechanical and dimensional standards, ensuring reliability across locating, alignment, and general machine-assembly applications:

These mechanical ratings confirm that AM Steel dog point grub screws deliver accurate locating and strong rotational location suited to alignment, stop, and keying applications – prepare a correctly sized mating hole or slot for the dog tip to maximize location precision.

Frequently Asked Questions (FAQs)

1. What is a dog point grub screw used for?
It’s used to locate and align a component by engaging its protruding cylindrical tip into a matching hole, slot, or keyway, providing precise positioning and strong rotational location, 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 except the working tip.

3. What is a dog point and when should I use it?
A dog point is a protruding, unthreaded cylindrical tip that locates into a mating hole or slot; use it when you need precise alignment, a stop or pivot, or strong rotational location rather than simple surface clamping.

4. What’s the difference between a dog point and a cup or cone point grub screw?
A dog point locates into a matching hole or slot for precise positioning and shear location, while cup and cone points bite or penetrate the shaft surface for friction-based locking – dog point is for alignment, cup and cone are for clamping onto a shaft.

5. Are AM Steel dog point grub screws different from generic ones?
AM Steel grub screws are manufactured and quality-tested under the AM Steel brand, ensuring consistent hardness, dog geometry, socket dimensions, and finish across every batch, per DIN 915 / ISO 4028.

6. What’s the difference between a short-dog and long-dog point?
Both have a protruding cylindrical tip, but the long-dog version has a longer tip for deeper engagement into the mating recess; choose the length to suit the depth of the hole or slot and the shear load required.

7. What sizes do dog point grub screws come in?
AM Steel dog point grub screws are available in a range of sizes, typically M3 to M12 in metric, with lengths from 4mm to 30mm, per DIN 915.

8. What tool do I need to install a dog 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. Do I need a matching hole for a dog point grub screw?
For its intended locating function, yes – the dog tip is designed to engage a correctly sized and positioned hole, slot, groove, or keyway; the fit between the dog and recess governs the location accuracy.

10. Are dog 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.

11. Can dog point grub screws be reused?
Yes, in most applications they can be removed and reinstalled, provided the dog tip and internal socket aren’t damaged; because the tip locates rather than bites, the mating surface is typically left undamaged.

12. What grade are alloy steel dog point grub screws?
AM Steel alloy steel grub screws are typically supplied to grade 45H – a hardened set-screw grade that gives the dog tip the strength needed to carry shear load and locate reliably.

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.