Description

AM Steel Allen Grub Screws – Flat Point are headless set screws driven entirely by an internal hexagon (Allen) socket, with a flat, non-penetrating point at the working end. Manufactured under the AM Steel brand to DIN 913 (ISO 4026), these socket set screws (widely known as grub screws or flat point set screws) are the set screw of choice wherever a component must be clamped or located without the point biting into or marring the mating surface – making them ideal for frequent adjustment and for use against pre-prepared shafts.

Because the flat point clamps rather than penetrates, AM Steel flat point grub screws are well suited to locating against a flatted section of shaft, clamping onto hardened shafts too tough for a biting point, and setting components that need to be repositioned or removed regularly without damaging the shaft. The flat tip also suits use against thin walls or soft materials where deep penetration would deform the part, and where the set screw provides light-to-moderate holding by friction and clamping force rather than by digging in. 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 flat 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 clamping onto a flatted or hardened shaft, setting a component that needs regular adjustment, locating against a thin or soft surface, or handling any assembly where the mating part must not be marred, AM Steel flat point grub screws deliver the clean, non-marring clamp, controlled torque, and consistent quality needed for adjustable 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 913, 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
• Flat, non-penetrating point that clamps without marring the mating shaft or surface
• Ideal for frequent adjustment and removal without damaging the shaft
• Suits clamping onto pre-flatted or hardened shafts and against thin or soft surfaces
• Internal hexagon (Allen) socket for controlled, high-torque tightening in bores and recesses
• Manufactured to DIN 913 / ISO 4026 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 – Flat Point are ideal for:

• Machine builders clamping components onto pre-flatted shaft sections without marring the shaft
• Adjustable settings where a component is repositioned or removed regularly and shaft damage must be avoided
• Clamping onto hardened shafts too tough for a penetrating cup or cone point
• Locating against thin walls or soft materials where deep penetration would deform the part
• General machinery and equipment assembly requiring a clean, non-marring locating set screw

Choosing the Right Allen Grub Screw – Flat Point

Selecting the correct flat 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 – Flat point is the choice for non-marring, frequently adjusted, or hardened-shaft applications; consider a cup point for general biting grip, a cone point for permanent high-hold location, or a dog point for locating into a hole or slot.
• Shaft Preparation – Flat point grips best against a pre-flatted section of shaft; on a round shaft it holds by clamping friction, so confirm the holding force suits the load.
• 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 flat point where the shaft must not be marred – Its non-penetrating tip clamps cleanly, making it the right choice for frequent adjustment, removal, or repositioning without damaging the shaft.
• Flat the shaft for a more secure clamp – Tightening the flat point against a machined flat on the shaft improves grip and resistance to rotation compared with clamping on a plain round shaft.
• 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.
• 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 913 / ISO 4026 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 – Flat Point are manufactured to meet recognized mechanical and dimensional standards, ensuring reliability across non-marring clamping, adjustable-location, and general machine-assembly applications:

These mechanical ratings confirm that AM Steel flat point grub screws deliver a clean, non-marring clamp suited to adjustable-location and hardened-shaft applications – tighten against a machined flat on the shaft for improved grip and rotation resistance.

Frequently Asked Questions (FAQs)

1. What is a flat point grub screw used for?
It’s used to clamp or locate a component against a shaft or surface without the point biting in or marring it – ideal for frequent adjustment, removal, or use against pre-flatted and hardened shafts, 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 flat point and when should I use it?
A flat point is a non-penetrating tip that clamps rather than digs in; use it where the shaft must not be marred, where the component is adjusted or removed often, or where the shaft is too hard for a biting point.

4. What’s the difference between a flat point and a cup point grub screw?
A flat point clamps cleanly without marring for frequent adjustment, while a cup point bites into the shaft with a sharp ring for higher general holding power – flat is for non-marring/adjustable use, cup is the everyday locking choice.

5. Are AM Steel flat 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 913 / ISO 4026.

6. Does a flat point grub screw hold as strongly as a cup or cone point?
On a plain round shaft it holds by clamping friction, so its resistance to rotation is generally lower than a biting cup or penetrating cone point; tightening against a machined flat on the shaft significantly improves its grip.

7. What sizes do flat point grub screws come in?
AM Steel flat point grub screws are available in a range of sizes, typically M3 to M12 in metric, with lengths from 3mm to 30mm, per DIN 913.

8. What tool do I need to install a flat 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 flat 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 flat point grub screws be reused?
Yes – because the flat point doesn’t penetrate or damage the shaft, they’re among the best point types for repeated removal and reinstallation, provided the internal socket isn’t rounded out.

11. What grade are alloy steel flat point grub screws?
AM Steel alloy steel grub screws are typically supplied to grade 45H – a hardened set-screw grade that gives the screw the strength and durability needed for reliable clamping.

12. Do flat 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.