Where this design fits

Shaft retention, stops, positioning and anti-rotation features.

What to include in the RFQ

State tip geometry, mating surface, drive and expected function. Clamping performance depends on the full assembly.

Material and acceptance

Carbon steel, 10B21, SUS304/316, aluminum, copper/brass and titanium alloy requirements can be discussed. Suitability is specific to the part, grade and process.

Define material condition, coating, critical dimensions and required inspection records. A named product family does not imply a tested load, pressure or performance rating.

RELEVANT PROCESS OPTIONS

Make the features work together.

These routes are options for technical review. The approved drawing, quantity and material determine the actual sequence.

Related product designs

Application discussions

Useful technical reading

Set screws: point and engagement matrix

Use this matrix to prepare a review. Values and acceptance methods are agreed for the actual part; these are specification fields, not catalog limits.

Interface	What to define	Verification discussion
Point form	Cone, cup, flat or dog point with dimensions	Inspect the defined tip rather than only the total length
Mating contact	Shaft surface, flat or locating recess	Agree marking and function on the actual mating arrangement
Installed depth	Tool access and effective engagement	Verify the screw position and usable drive engagement
Material condition	Grade, required final properties and finish	Specify evidence separately from thread and dimensional checks

Common specification questions

Which point is best for a shaft?

The answer depends on the shaft surface, permitted marking and whether the point clamps or locates. Supply the mating geometry and functional requirement.

Can holding force be specified from screw size alone?

No. Engagement, contact, material, assembly and loading affect the complete connection. The responsible design must establish the requirement.

Choose the point by its contact with the mating part

The point form determines how contact is made. Select it with the mating surface, adjustment frequency and allowable marking, then define usable thread and tool access.

Interface sketch — not to scale. Dimensions and acceptance follow the approved assembly drawing.

Flat point: define the mating face and agree the permitted contact marks.
Cone point: show the intended recess or permitted indentation and the location it must engage.
Dog point: define the projection and mating hole or slot; check both clearance and available depth.
Cup point: review rim contact and any indentation against the permissible damage to the mating surface.

Review repeated adjustment and retention on the actual joint. Point geometry and screw diameter alone do not provide a universal holding-force or tightening-torque value.

Compare the four point forms and selection worksheet

Choose the point around the mating surface

Cone, cup, flat and dog points serve different contact arrangements. A locating dog point needs its mating recess defined. A point that bites into a shaft may leave a mark that is unacceptable elsewhere. State whether the screw locates, clamps or acts as a stop, and show the surface it contacts before selecting the tip.

Keep engagement and access visible

A headless screw can sit below or project above the mating surface. Show the installed position, available tool depth and required thread engagement. A longer screw is not automatically a stronger connection if the actual engaged length is unchanged. Recess geometry, material condition and the mating tapped part all belong in the review.

Distinguish retention from fine adjustment

A set screw used as a shaft retainer has a different acceptance question from one used as a fine positioning stop. For a stop, define the contact end, adjustment travel and locking method. For retention, define the assembled functional requirement with the responsible designer; do not assign a universal holding force from the screw size alone.

Inspect the features that establish the function

Verify thread acceptance, tip form, overall length and the specified material condition. An external vision profile cannot by itself validate the socket or assembled holding behavior. Where a modified tip, side hole or eccentric feature is added, include its relationship to the thread axis and the agreed method for checking that relationship.

Review the route before fixing the quotation

For custom set screws & grub screws, review Swiss-Type & CNC Turning, Thread Rolling, Cutting & Tapping, Material-Specific Heat Treatment against the drawing and quantity. Identify which features can be produced in the initial shape and which require a separate setup. A change to a functional shoulder, bore, drive or thread can change the proposed route as well as the inspection effort.

The drawing review should resolve tip options; thread options; additional features. Keep material condition and finishing allowance attached to those requirements. Define the acceptance condition for critical features and approve any proposed dimensional change before comparing samples with the original assembly.

From drawing to approved samples

State tip geometry, mating surface, drive and expected function. Clamping performance depends on the full assembly. Identify the drawing revision, prototype quantity and expected repeat demand. Where the first part is based on an existing sample, separately confirm material and hidden features rather than inferring them from appearance.

The typical sampling lead time, including tooling, is approximately 10–15 days. The schedule is confirmed after drawing review and agreement on the sample specification; material availability, special treatment and inspection requirements can affect the confirmed date. Confirm when the agreed schedule starts in the quotation. Sample approval and repeat-production delivery are separate milestones.

CONNECTED SPECIFICATION TOPICS

Connect the part to its requirements.

Review these related topics for this design or route. Grade, treatment, geometry and acceptance remain drawing-specific.

MATERIAL & FINAL CONDITION

Carbon & Alloy Steel ↗

Specify the finished fastener property class, not a strength inferred from the raw grade. Common nominal class references include 8.8, 10.9 and 12.9.

Custom Set Screws & Grub Screws