Premium A2 (304) and A4 (316) stainless steel Allen Grub- dog point. Available in metric coarse threads and select UNC/BSW on request. Mill Test Certificates (MTC), strict dimensional tolerances, and fast dispatch from ready stock.
DIN 915
Stainless Steel Allen Grub – Dog Point
TRSUTED SS Allen Grub- dog point FOR DEMANDING APPLICATION
Key Specifications
Standards
-
Grades (Material)
A2 (304), A4 (316)
Strength Classes
-
Threads
Metric coarse (default). Fine/UNC/BSW available on request
Sizes
M1.6 to M 70, 3/16" to 2.1/2" (others on request)
Lengths
-
Head
-
Marking
Grade/class & manufacturer ID as applicable
Certificates
MTC 3.1 / chemical composition & mechanicals available
Compliance
RoHS/REACH; generally non-magnetic in solution-annealed state (slight magnetism possible after cold-work)
Choosing the Right Stainless Steel Allen Grub – Dog Point
Choosing the Right Allen Grub – Dog Point (Socket Set Screw)
1) What is an Allen grub – dog point & when to use it?
An Allen grub screw (socket set screw) – dog point is a headless screw with an internal hex (Allen) drive and a cylindrical tip (“dog”) that extends beyond the threads.
Use a dog point grub screw when you want:
Positive location in a hole, slot, or groove
The screw to drive / index / locate a part, not just clamp by friction
A repeatable position every time you loosen and re-tighten
Typical applications:
Indexing collars and hubs into a pre-drilled hole in a shaft
Locating pins for levers, cams, and sliding parts
Guides and stops that must return to the same position
Synchronising components using holes or slots
Dog point = locating & driving, rather than just friction locking.
2) Environment & corrosion
Indoor / dry / general machinery:
Use hardened alloy steel dog point grub screws, black / oiled.
Ideal for machine tools, indexing collars, levers, timing devices.
Outdoor / damp / stainless assemblies:
Use A2 (304) stainless dog point grubs.
For stainless shafts, outdoor mechanisms, food equipment (non-marine).
Marine / chloride / heavy wash-down / chemicals:
Use A4 (316) stainless dog point grubs.
For marine shafts, coastal drives, chemical plants, food & pharma wash-down.
Rule of thumb:
Priority = precision & strength in dry conditions → alloy steel
Priority = corrosion resistance → A2 / A4 stainless
3) Point style – why dog point vs cup / cone / flat?
Dog point (your product):
Has a cylindrical tip, often with a flat end.
Designed to sit in a mating hole or slot.
Gives positive, repeatable location and is excellent for indexing and driving.
Compared to:
Cup / cone point:
Mainly for biting into a shaft surface for friction locking.
Not ideal where you want a precise, repeatable location.
Flat point:
For gentle clamping against flats or keys.
No positive engagement in a hole—only friction.
Use dog point when the design includes a matching hole, groove or notch that the tip must engage.
Mechanical Properties (Guide)
Mechanical Properties (Guide) – Allen Grub Screw – Dog Point
Dog point design changes the function at the tip, but body and material properties are similar to other grub screws of the same material.
1) Alloy steel dog point grub screws (hardened)
Typical characteristics:
Made from medium / alloy steel, hardened and tempered.
Often to set-screw hardness around 45H (mid-40s to low-50s HRC).
This gives:
High surface hardness and good wear resistance at the dog tip.
Strong tensile and shear capacity along the threads.
Very good resistance to plastic deformation under repeated use in holes/slots.
Functional behaviour:
Dog tip resists mushrooming and wear in steel holes.
Excellent for frequent engagement/disengagement in indexing applications.
2) Stainless steel dog point grub screws (A2 / A4)
Typical characteristics:
Material: A2 (304) or A4 (316) stainless.
Lower hardness than fully hardened alloy steel, but:
Good tensile strength (A2-70 / A4-70 ≈ 700 MPa).
Excellent corrosion resistance.
Functional behaviour:
Best for stainless mechanisms, food & pharma equipment, marine and outdoor use.
Dog tip still provides positive location in stainless or non-ferrous holes/slots, though it may deform slightly sooner than hardened steel in very high-stress cases.
3) Functional performance & failure modes
For a correctly chosen dog point grub screw:
Performance depends on:
Screw size & material
Quality of the mating hole/slot (diameter, depth, shape)
Correct thread engagement and tightening
Typical failure/slip modes:
Wear or deformation of the dog tip if loads are very high and repeated.
Elongation or ovalisation of the mating hole/slot over time.
Thread stripping in the hub if engagement is too short or material too soft.
Loosening in vibration if no thread-locking or correct torque.
Good practice:
Match dog diameter to the hole/slot size carefully.
Ensure enough thread length in the supporting part.
Use thread-locker in high-vibration applications.
For very high load or critical indexing, use hardened holes or inserts for the dog to locate into.
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Frequently Asked Questions
What is an Allen grub screw – dog point?
An Allen grub screw (socket set screw) – dog point is a headless screw with an internal hex (Allen) drive and a cylindrical tip (the “dog”) that projects beyond the threads.
The dog point is designed to fit into a hole, slot, or groove for positive location and driving, not just friction clamping.
Where are dog point grub screws commonly used?
Indexing collars and hubs that locate into a hole in a shaft
Levers, cams, and sliding parts that must return to a precise position
Stops and guides running in a slot or groove
Synchronising or timing components that use holes/slots for repeatable positioning
They’re widely used wherever parts must re-engage in the same position every time.
Do I need a matching hole or slot to use a dog point grub screw?
Yes, ideally:
A dog point will still press on a plain surface, but it is specifically designed to sit inside a hole, recess, or slot.
Without a matching feature, you lose the main benefit of positive location and are just pressing with a small cylinder.
For best performance, design a hole or slot sized to suit the dog point.
Can dog point grub screws carry torque or just locate parts?
They can do both, but you should be clear about their role:
In many designs, torque is carried by a key, spline, or friction clamp, and the dog point grub screw is mainly used for location/indexing and anti-rotation.
In lighter-duty cases, the dog point itself can help drive via the hole, but repeated high-torque loading may wear the hole.
Best practice for high torque:
→ Use key/keyway or clamp for torque, dog point for accurate location and anti-slip.
How do I keep dog point grub screws from loosening?
Tighten correctly with the proper size Allen key.
Use medium-strength thread-locker for vibration-prone assemblies.
For very high vibration, consider:
A second “jam” grub screw on top, and/or
Combining dog point + proper fit of hole/slot + key/clamp.
