DIN 931 Hex Head Bolt (Partial Thread) | ISO 4014 Technical Datasheet
Product Overview
DIN 931 Hex Head Bolts, now superseded by ISO 4014, are partially threaded hexagon head bolts widely used in machinery, structural steelwork, fabrication, industrial equipment, automotive assemblies, construction, and heavy engineering applications. The unthreaded shank improves alignment and provides greater resistance to shear forces, making DIN 931 bolts ideal for joints subjected to transverse loading.
Horizon Inc. supplies DIN 931 / ISO 4014 hex bolts in a wide range of metric sizes, property classes, materials, and protective finishes to meet the requirements of industrial and engineering fastening applications.
Table of Contents
ITEM CODE: 1011
Standards
DIN 931
Equivalent standard ISO 4014
Dimensions
| d1 | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M24 | M30 | M36 |
|---|---|---|---|---|---|---|---|---|---|---|
| b up to L125 mm | 16 | 18 | 22 | 26 | 30 | 38 | 46 | 54 | 66 | 78 |
| b from L125mm | 44 | 52 | 60 | 72 | 84 | |||||
| to L200mm | 22 | 24 | 28 | 32 | 36 | 57 | 65 | 73 | 85 | 97 |
| b over 200 mm | – | – | 45 | 49 | 26.8 | 33.5 | 40 | 50.8 | 60.7 | |
| e | 8.79 | 11 | 14.3 | 18.9 | 21.1 | 10 | 12.5 | 15 | 18.7 | 22.5 |
| k | 3.5 | 4 | 5.3 | 6.4 | 7.5 | 24 | 30 | 36 | 46 | 55 |
| s | 8 | 10 | 13 | 17 | 19 | 2 | 2.5 | 3 | 3.5 | 4 |
all dimensions in mm
Dimensions Tolerances:
General dimensional tolerances for standard metric fasteners—including thread diameter, overall length, head diameter, head height/thickness, across flats, and washer dimensions—are available in our Standard Dimensional Tolerances for Common Metric Fasteners guide.
Certain product-specific features, such as drive recess dimensions, socket depth, countersink geometry, under-head radii, and other special characteristics, are governed by the applicable DIN or ISO product standard and may not included in this datasheet.
Download Technical Datasheets
| Grade | Download |
|---|---|
| A2-70 (SS304) | ⬇️ Download Technical Datasheet |
| A4-70 (SS316) | ⬇️ Download Technical Datasheet |
| Property Class | Download |
|---|---|
| 8.8 | ⬇️ Download Technical Datasheet |
| 10.9 | ⬇️ Download Technical Datasheet |
| 12.9 |
Mechanical Properties
Stainless Steel
| Grade | Property Class | Tensile Strength | Yield Strength | Hardness |
|---|---|---|---|---|
| A2-70 (SS304) | 70 | ≥700 MPa | ≥450 MPa | 215 HV Max |
| A4-70 (SS316) | 70 | ≥700 MPa | ≥450 MPa | 215 HV Max |
Carbon Steel
| Property Class | Tensile Strength | Yield Strength | Hardness | Typical Use |
|---|---|---|---|---|
| 8.8 | 800 MPa | 640 MPa | 255–335 HV | Industrial |
| 10.9 | 1040 MPa | 940 MPa | 320–380 HV | Heavy Duty |
| 12.9 | 1220 MPa | 1100 MPa | 385–435 HV | Critical Applications |
Material Characteristics and Recommended Applications
| Material | Characteristics | Typical Applications |
|---|---|---|
| Carbon Steel | Economical and suitable for general engineering | Machinery, fabrication, maintenance |
| Alloy Steel | High tensile strength and fatigue resistance | Heavy machinery, automotive, structural applications |
| Stainless Steel A2 (304) | Good corrosion resistance | Food processing, electrical panels, indoor installations |
| Stainless Steel A4 (316) | Excellent corrosion resistance | Marine, chemical plants, offshore equipment |
| Brass | Non-magnetic and corrosion resistant | Electrical equipment, decorative applications |
Technical Specifications
| Property | Specification |
|---|---|
| Product | Hex Head Bolt – Partial Thread |
| Standard | DIN 931 / ISO 4014 |
| Thread Type | Metric Coarse Thread |
| Head Type | Hexagon Head |
| Thread Configuration | Partial Thread |
| Thread Direction | Right-Hand (Standard) |
| Diameter Range | M5 – M64 (Typical) |
| Length Range | 16 mm – 500 mm (Depending on Diameter) |
| Property Classes | 4.6, 4.8, 5.8, 8.8, 10.9, 12.9 |
| Stainless Grades | A2-50, A2-70, A4-70, A4-80 |
| Surface Finish | Self Colour, Zinc Plated, Yellow Zinc, Hot Dip Galvanized, Black Oxide, Geomet®, Dacromet® |
| Thread Tolerance | 6g |
| Unit | Metric (mm) |
DIN 931 Hex Bolt Weight Chart
Weight in kgs. per 1,000 pcs. All weights are approximations.
| Diameter/ Length | M4 | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M24 | M30 | M36 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 | 3.12 | 4.86 | |||||||||
| 30 | 3.61 | 5.64 | 8.06 | ||||||||
| 35 | 4.04 | 6.42 | 9.13 | 18.2 | |||||||
| 40 | 4.53 | 7.2 | 10.2 | 20.3 | 35 | ||||||
| 45 | 7.98 | 11.3 | 22.2 | 38 | 53.6 | ||||||
| 50 | 8.76 | 12.3 | 24.2 | 41.1 | 58.1 | ||||||
| 55 | 13.4 | 25.8 | 43.8 | 62.6 | 115 | ||||||
| 60 | 14.4 | 27.8 | 46.9 | 67 | 123 | ||||||
| 65 | 29.8 | 50 | 70.3 | 131 | 219 | ||||||
| 70 | 31.8 | 53.1 | 74.7 | 139 | 231 | ||||||
| 75 | 33.7 | 56.2 | 79.1 | 147 | 243 | ||||||
| 80 | 35.7 | 59.3 | 83.6 | 155 | 255 | 392 | |||||
| 85 | 62.4 | 88.1 | 163 | 267 | 410 | ||||||
| 90 | 65.5 | 92.4 | 171 | 279 | 428 | 712 | |||||
| 95 | 68.6 | 96.8 | 179 | 291 | 446 | 739 | |||||
| 100 | 71.7 | 101 | 186 | 303 | 464 | 767 | |||||
| 110 | 109 | 202 | 327 | 500 | 823 | 1240 | |||||
| 120 | 118 | 218 | 351 | 535 | 880 | 1320 | |||||
| 130 | 230 | 374 | 560 | 920 | 1390 | ||||||
| 140 | 246 | 398 | 595 | 975 | 1470 | ||||||
| 150 | 262 | 422 | 630 | 1030 | 1550 | ||||||
| 160 | 278 | 446 | 665 | 1085 | 1630 | ||||||
| 170 | 470 | 700 | 1140 | 1710 | |||||||
| 180 | 494 | 735 | 1200 | 1790 | |||||||
| 190 | 519 | 770 | 1250 | 1870 | |||||||
| 200 | 544 | 805 | 1310 | 1950 | |||||||
| 220 | 870 | 1420 | 2110 | ||||||||
| 240 | 935 | 1530 | 2270 | ||||||||
| 260 | 1640 | 2430 | |||||||||
| 280 | 1750 | 2590 | |||||||||
| 300 | 1860 | 2750 |
Applications
DIN 931 hex bolts are commonly used in:
- Structural steel fabrication
- Industrial machinery
- Machine tools
- Automotive assemblies
- Agricultural equipment
- Material handling systems
- Electrical switchgear
- Telecom infrastructure
- Renewable energy equipment
- Construction machinery
- Heavy engineering
- General manufacturing
Advantages
- Partial thread provides improved shear strength.
- Smooth shank assists in precise component alignment.
- High clamping force for secure fastening.
- Available in multiple strength grades.
- Manufactured to internationally recognised DIN and ISO standards.
- Compatible with standard hex nuts and washers.
- Suitable for both static and dynamic loading conditions.
- Available in various corrosion-resistant finishes.
- Easy installation using standard spanners and sockets.
- Widely used across industrial and structural applications.
Frequently Asked Questions
What is the difference between DIN 931 and DIN 933?
DIN 931 bolts are partially threaded, while DIN 933 bolts are fully threaded. Partial thread bolts provide better shear strength and alignment, whereas full thread bolts offer maximum thread engagement.
Is DIN 931 the same as ISO 4014?
Yes. DIN 931 has largely been replaced by ISO 4014, and the two standards are interchangeable for most industrial applications, subject to dimensional verification.
Why are partial thread bolts preferred in structural applications?
The unthreaded shank has a larger cross-sectional area than the threaded portion, making it better suited to resist shear forces and reducing stress concentrations in the joint.
What property class should I choose?
Property Class 8.8 is suitable for most industrial applications. Classes 10.9 and 12.9 are used where higher strength is required, while stainless steel grades are preferred in corrosive environments.
Can DIN 931 bolts be used with standard hex nuts?
Yes. DIN 931 bolts are compatible with standard metric hex nuts such as DIN 934 / ISO 4032, provided the thread size and pitch match.
Are DIN 931 bolts available in stainless steel?
Yes. They are commonly available in Stainless Steel A2 (304) and A4 (316), offering excellent corrosion resistance for outdoor, marine, and chemical environments.
How is the length of a DIN 931 bolt measured?
Bolt length is measured from the underside of the hex head to the end of the threaded shank.
What surface finishes are available?
Common finishes include zinc plating, yellow zinc passivation, hot-dip galvanizing, black oxide, Geomet®, Dacromet®, and self-colour finishes, depending on the material and application.
What industries commonly use DIN 931 hex bolts?
DIN 931 hex bolts are widely used in construction, manufacturing, automotive, electrical equipment, renewable energy, agriculture, heavy engineering, and industrial machinery.
What is the advantage of a partially threaded bolt?
The smooth shank improves component alignment, reduces wear between assembled parts, and provides higher resistance to shear loads compared to a fully threaded bolt of the same diameter.
Need Technical Assistance or a Quote?
Looking for pricing, samples, CAD drawings, or help selecting the right fastener? Our team can help you choose the correct product for your application.
📧 sales@horizonincindia.com | 📞 +91 80 4117 9152 | 💬 +91 99167 77262
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