ISO 4014 Hex Bolts (Partially Threaded)
Partially threaded hexagon head bolts per ISO 4014 — the governing metric hex-bolt standard, covering M1.6 to M64 in product grades A and B with a defined unthreaded shank whose length varies with diameter and nominal length. Dimensional counterpart: ISO 4017 (fully threaded); predecessor standard: DIN 931.
Last updated: 2026-11
Specifications
ISO 4014 is the modern international dimensional standard for the hex bolt with a smooth unthreaded shank between head and thread. That shank is not a manufacturing leftover — it is the feature buyers specify the standard for: it can sit through the clearance holes of the clamped parts, it keeps threads out of a shear plane in transversely loaded joints, and it gives the bolt a controlled bearing interface in machinery, frames and brackets. The standard covers M1.6 to M64 in product grades A and B (a tolerance class, not a strength rating — the property class comes separately from ISO 898-1). One caution from the comparison sources: thread length in ISO 4014 is defined by the standard and varies with both diameter and nominal length, so a "long enough" bolt is not automatically a correctly located shank — check the grip before releasing the drawing. The fully threaded equivalent is ISO 4017; the predecessor designation still seen on older drawings is DIN 931.
| Standard | ISO 4014 — hexagon head bolts, product grades A and B, partially threaded; covers M1.6–M64 |
|---|---|
| Thread | Metric coarse pitch; partial thread with a standard-defined unthreaded shank (thread length varies with diameter and nominal length) |
| Product grades | A and B — dimensional tolerance classes, not strength; property class specified separately (ISO 898-1) |
| Head dimensions (anchor sizes from the collected table) | Width across flats s: 8 mm at M5, 10 at M6, 13 at M8, 16 at M10, 18 at M12, 24 at M16, 30 at M20, 36 at M24, 46 at M30, 55 at M36, 65 at M42, 85 at M56, 95 at M64; head height k nominal: 3.5 mm at M5 to 40 mm at M64 |
| Width across corners e (min, collected table) | 8.79 mm at M5, 11.05 at M6, 14.38 at M8, 17.77 at M10, 20.03 at M12, 26.75 at M16, 33.53 at M20, 39.98 at M24, 60.79 at M36, 93.56 at M56, 104.86 at M64 |
| Coarse pitch (collected table) | 0.8 mm at M5 rising to 6.0 mm at M64 (1.0 at M6, 1.25 at M8, 1.5 at M10, 1.75 at M12, 2.0 at M14/M16, 2.5 at M18–M22, 3.0 at M24/M27, 3.5 at M30/M33, 4.0 at M36/M39, 4.5 at M42/M45, 5.0 at M48/M52, 5.5 at M56/M60) |
| Series extent | The collected table also prints M1/M1.2/M1.4 head geometry, labelled there as below the ISO 4017 range (M1.6–M64) and supplied as a manufacturer series — quote those sizes as specials, not as ISO 4014 |
| Finish | Governed separately — ISO 4042 for electroplating; hot-dip galvanizing where the class and fit allow |
| Predecessor / counterpart | DIN 931 (close correspondence); ISO 4017 for the fully threaded configuration; ISO 8765 for the fine-pitch series |
Materials
- Steel property class per ISO 898-1 (e.g. 8.8, 10.9) or stainless per ISO 3506 — specified separately from the dimensional standard
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 4014 Hex Bolts (Partially Threaded)) 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 1,000–10,000 pieces depending on size. Stock items run 3–7 days. High-strength and custom parts run 15–25 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 choose a partially threaded ISO 4014 bolt over the fully threaded ISO 4017 screw?
For the shank. Typical reasons the comparison sources list: keeping threads away from a shear plane in a transversely loaded joint, running the smooth body through clearance holes so the parts locate on the shank, and using the shank as the bearing interface. The responsibility that comes with it: the standard-defined thread length must place the runout outside the grip — an under-threaded selection leaves the nut running out of thread before the joint is clamped, and more torque will not fix that. If the stack is thin or grip varies between assemblies, that is what ISO 4017 is for; see the 4014 vs 4017 page for the full decision.
Does ISO 4014 define how strong the bolt is?
No — and this is the most common procurement error with hex-bolt callouts. ISO 4014 is dimensional only: size ladder, head geometry, shank and thread configuration, product grades A/B for tolerance. Strength is a separate decision written in the same purchase line: a steel property class under ISO 898-1 (8.8, 10.9, …) or a stainless grade under ISO 3506. The comparison sources warn equally against treating the two 4014/4017 standards as interchangeable strength levels — changing 8.8 to 10.9 changes the mechanical properties, changing 4014 to 4017 changes where the thread sits; they are separate engineering decisions and both belong on the RFQ.
What is the MOQ and lead time for this bolt grade?
The minimum order quantity is 1,000–10,000 pieces depending on size. Stock items ship in 3–7 days; high-strength and custom parts in 15–25 days. Common diameters in this grade are widely stocked; confirm the exact schedule against quantity and size mix at quotation.
What should an RFQ for this bolt grade state?
State the standard and grade (for example ISO 4017 Class 8.8 or ASTM F3125 Grade A325 Type 1), diameter and length, thread type (metric coarse or UNC/UNF), finish (plain, zinc, or hot-dip galvanized where the grade permits), required certificates such as a mill test report per EN 10204 3.1, and quantity per size — plus destination country.
Related knowledge
- What Bolt Property Classes 8.8, 10.9 and 12.9 Encode — and When High Strength Stops Being the Right Choice
- Bolt Grade Selection: ISO 898-1 8.8/10.9/12.9 vs ASTM A307 and A325
- 8.8 vs 10.9 vs 12.9 Bolts: Strength, Hardness and Cost — What the Evidence Settles
- Calculating Bolt Preload and Clamp Force: Torque, Friction and Tightening Method
- How to Determine Tightening Torque and Choose a Tightening Method for a Bolted Joint
- Fastener Failure Modes: Which Fatigue, Creep and SCC Controls the Evidence Supports
- Hydrogen Embrittlement in High-Strength Bolts: Which Grades Need Controls, Which Coatings and Baking Schedules Are Acceptable, and What to Require Before the RFQ
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