ISO 4029 Cup Point Hex Socket Set Screws
ISO 4029 hex socket set screws with cup point, M1.6 to M24 — the highest-grip standard set screw whose hollowed point bites a ring into the mating surface — with the full collected 13-size table including cup diameter d z and short/long key engagement.
Last updated: 2026-11
Specifications
The cup point is the workhorse of the socket set-screw family and ISO 4029 is its metric home: a shallow, hollow-ground point that concentrates the clamping load on a sharp circular edge, biting a ring into the mating surface for the best slip resistance of the standard points. That bite is the feature and the cost — the cup leaves a permanent seat, so it is chosen for parts that are set once and stay set: pulleys on line shafts, handles, indexing stops. The collected table covers the full series M1.6 to M24: pitch P, cup point diameter d z (max/min), socket across-corners e min, key width s (nominal/max/min), and key engagement t min printed for short and long screws (the source carries a ① marker on the t row with no legend on the page — reproduced verbatim). For duty with repeated adjustment or finished surfaces, compare the flat point ISO 4026 and dog point ISO 4028 pages on this site — the cup trades surface damage for grip.
| Standard | ISO 4029 — hexagon socket set screws with cup point |
|---|---|
| Series | M1.6 – M24 (13 sizes tabulated) |
| Tabulated geometry | Per size: pitch P, cup point diameter d z max/min, socket across-corners e min, key width s nominal/max/min, key engagement t min — printed separately for short screws and long screws (source marker ① reproduced without a legend) |
| Point style | Cup point — sharp circular edge bites a seating ring; highest standard-point grip, permanent surface mark |
| Family note | Point-style sibling of ISO 4026 flat, ISO 4027 cone and ISO 4028 dog; metric counterpart of the DIN 916 line |
| Materials / strength | Not tabulated by the collected specification — per RFQ (property class and stainless grade per drawing callout) |
| Nominal thread | P — pitch (mm) | d z max (mm) | d z min (mm) | e min (mm) | s nominal (mm) | s max (mm) | s min (mm) | t min — short screw (mm) | t min — long screw (mm) |
|---|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 0.8 | 0.55 | 0.809 | 0.7 | 0.724 | 0.71 | 0.7 | 1.5 |
| M2 | 0.4 | 1 | 0.75 | 1.011 | 0.9 | 0.913 | 0.887 | 0.8 | 1.7 |
| M2.5 | 0.45 | 1.2 | 0.95 | 1.454 | 1.3 | 1.3 | 1.275 | 1.2 | 2 |
| M3 | 0.5 | 1.4 | 1.15 | 1.733 | 1.5 | 1.58 | 1.52 | 1.2 | 2 |
| M4 | 0.7 | 2 | 1.75 | 2.303 | 2 | 2.08 | 2.02 | 1.5 | 2.5 |
| M5 | 0.8 | 2.5 | 2.25 | 2.873 | 2.5 | 2.58 | 2.52 | 2 | 3 |
| M6 | 1 | 3 | 2.75 | 3.443 | 3 | 3.08 | 3.02 | 2 | 3.5 |
| M8 | 1.25 | 5 | 4.7 | 4.583 | 4 | 4.095 | 4.02 | 3 | 5 |
| M10 | 1.5 | 6 | 5.7 | 5.723 | 5 | 5.14 | 5.02 | 4 | 6 |
| M12 | 1.75 | 8 | 7.64 | 6.863 | 6 | 6.14 | 6.02 | 4.8 | 8 |
| M16 | 2 | 10 | 9.64 | 9.149 | 8 | 8.175 | 8.025 | 6.4 | 10 |
| M20 | 2.5 | 14 | 13.57 | 11.429 | 10 | 10.175 | 10.025 | 8 | 12 |
| M24 | 3 | 16 | 15.57 | 13.716 | 12 | 12.212 | 12.032 | 10 | 15 |
| Nominal size | Thread pitch (mm) | D max — body dia (mm) | J max — plain cup point dia (mm) | J max — knurled cup point dia (mm) | K — knurled cup outside dia (mm) | L — preferred length, plain cup (mm) | L — preferred length, knurled cup (mm) | W — hex socket size (mm) | Recommended seating torque (N·m) | Recommended seating torque (in·lbf) |
|---|---|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.35 | 1.0 | 0.80 | – | – | 2.0 | – | 0.7 | 0.09 | 0.8 |
| M2 | 0.40 | 1.32 | 1.00 | – | – | 2.5 | – | 0.9 | 0.21 | 1.8 |
| M2.5 | 0.45 | 1.75 | 1.25 | – | – | 3.0 | – | 1.3 | 0.57 | 5.0 |
| M3 | 0.5 | 2.10 | 1.50 | 1.40 | 2.06 | 3.0 | 3.0 | 1.5 | 0.92 | 8.0 |
| M4 | 0.7 | 2.75 | 2.00 | 2.10 | 2.74 | 3.0 | 3.0 | 2.0 | 2.2 | 19.0 |
| M5 | 0.8 | 3.70 | 2.50 | 2.50 | 3.48 | 4.0 | 4.0 | 2.5 | 4.0 | 35.0 |
| M6 | 1.0 | 4.35 | 3.00 | 3.30 | 4.14 | 4.0 | 5.0 | 3.0 | 7.2 | 64 |
| M8 | 1.25 | 6.00 | 5.00 | 5.00 | 5.62 | 5.0 | 6.0 | 4.0 | 17.0 | 150.0 |
| M10 | 1.5 | 7.40 | 6.00 | 6.00 | 7.12 | 6.0 | 8.0 | 5.0 | 33.0 | 290 |
| M12 | 1.75 | 8.60 | 8.00 | 8.00 | 8.58 | 8.0 | 10.0 | 6.0 | 54.0 | 480 |
| M16 | 2.0 | 12.35 | 10.00 | 10.00 | 11.86 | 12.0 | 14.0 | 8.0 | 134 | 1190 |
| M20 | 2.5 | 16.00 | 14.00 | 14.00 | 14.83 | 16.0 | 18.0 | 10.0 | 237 | 2100 |
| M24 | 3.0 | 18.95 | 16.00 | 16.00 | 17.80 | 20.0 | 20.0 | 12.0 | 440 | 3860 |
- Row 3 (M2.5): the M2.5 plain cup point diameter prints 1.25 where the ISO 4029 dz maximum is 1.2 — carried as printed, not normalized.
- Row 4 (M3): the M3 plain cup point diameter prints 1.50 where the ISO 4029 dz maximum is 1.4 (the knurled value 1.40 agrees) — carried as printed, not normalized.
- Row 5 (M4): the M4 knurled cup point diameter prints 2.10 where the ISO 4029 dz maximum is 2.0 (the plain value 2.00 agrees) — carried as printed, not normalized.
- Row 7 (M6): the M6 knurled cup point diameter prints 3.30 where the ISO 4029 dz maximum is 3.0 (the plain value 3.00 agrees), and the knurled preferred length runs 5.0 against plain 4.0 — carried as printed.
Materials
- Material, property class and finish specified per RFQ — the collected specification table covers geometry only
Ordering & documentation
Documents
Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.
Quotation
- The fastener family (ISO 4029 Cup Point Hex Socket Set Screws) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
- Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
- Quantity per size and your target delivery date.
- Destination country, and any required documents (for example a mill test certificate) so the quote includes them.
Sample & supply
Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.
Storage & shipping
Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.
Frequently asked questions
Why is the cup point the default set screw despite marking the shaft?
Because most set-screw duty is set-and-forget: a pulley hub, a knob, a collar that is aligned once and never moved again. On those joints the cup point's sharp edge delivers the highest resistance to sliding of any standard point, and the marking ring it leaves is cosmetic. The failure mode to design around is removal for maintenance — every re-tighten deepens the seat on a soft shaft — and that is exactly the duty where the flat point (ISO 4026) or dog point (ISO 4028) earns its place instead. Matching hardness matters too: against a hardened shaft, an unhardened cup point will not bite at all.
What should an RFQ for ISO 4029 set screws state?
The designation (ISO 4029), thread size, length, material and property class or stainless grade, finish, and quantity per size. Note the short/long screw key-engagement split in the table applies per length; cup diameter d z is listed for groove and hardness matching; commercial terms follow the quotation.
What is the MOQ and lead time for these screws?
Minimum order quantity is 10,000 pieces per item. Stocked sizes ship in 3–7 days; non-stock diameters, lengths or finishes are quoted with a confirmed schedule. Common sizes in this designation are widely stocked — confirm the exact schedule against quantity and size mix at quotation.
Related knowledge
- Thread-Forming vs Thread-Cutting vs Thread-Rolling Self-Tapping Screws: What the Evidence Settles on Base Material
- Screw Family Selection by Base Material: Wood, Machine and Self-Tapping Threads, Engagement and Coating
- Hex Bolts vs Socket Head Cap Screws: What the Evidence Settles on Strength, Clearance and Cost
Request a Quote
Get factory-direct pricing from the manufacturer.
What to include in your inquiry
- ✓ Standard and property class (e.g. DIN 912, ISO 4762, class 8.8) — or a drawing for custom parts.
- ✓ Sizes, lengths and thread type (metric or inch).
- ✓ Quantity per size and your target delivery date.
- ✓ Destination country, plus any coating or finish requirement.
- ✓ Any documents you need with the shipment (e.g. mill test certificate) so the quote includes them.
- ✓ Your inquiry goes straight to the factory team by email and gets a reply within 24 hours.
- ✓ Factory-direct pricing
- ✓ Standard and custom specifications
- ✓ Factory-direct export to buyers in Europe, Asia, the Americas and the Middle East
- ✓ Full fastener family support