Home » Full Thread Hex Bolts (ISO 4017) High Tensile Stainless Steel (A2-70)

Full Thread Hex Bolts (ISO 4017) High Tensile Stainless Steel (A2-70)

Full Thread Hex Bolts (ISO 4017 / DIN 933) — High Tensile Stainless Steel A2-70 (SUS304)

FULLERKREG ISO 4017 / DIN 933 full thread hex bolts are manufactured from A2-70 high tensile stainless steel (SUS304) and finished with whitened passivation for superior corrosion resistance. The full-thread (fully threaded) design ensures maximum thread engagement along the entire shank length, making these bolts the preferred choice for clamping, through-bolting, and applications where adjustable grip length is required. Compliant with ISO 4017, DIN 933, and GB 5783 standards.

Product Highlights

  • Brand: FULLERKREG
  • Standards: ISO 4017 / DIN 933 / GB 5783
  • Material: A2 Stainless Steel (SUS304 / X 5 Cr Ni 18-10)
  • Property Class / Strength Grade: A2-70
  • Thread Type: Full Thread (Fully Threaded Shank)
  • Surface Treatment: Whitened & Passivated (酸洗钝化)
  • Head Type: Hexagon (Hex Head)
  • Size Range: M3 – M24
  • Thread: Metric coarse thread per ISO 261 / DIN 13
  • Drive: Hex wrench / spanner (AF across flats)

Why Choose FULLERKREG ISO 4017 A2-70 Full Thread Hex Bolts?

  • ✅ A2-70 high tensile grade — Rm ≥ 700 MPa, significantly stronger than standard A2-50 (500 MPa)
  • ✅ Full thread design — maximum thread engagement; ideal for through-bolting and variable grip-length applications
  • ✅ A2 (SUS304) stainless steel — excellent corrosion resistance for marine, food, outdoor, and chemical environments
  • ✅ Passivated finish — enhanced chromium oxide passive layer for long-term rust protection
  • ✅ Triple standard compliance — ISO 4017 / DIN 933 / GB 5783 for global market acceptance
  • ✅ Non-magnetic (austenitic) — suitable for sensitive electronic and MRI-adjacent environments
  • ✅ Wholesale & bulk supply — available in large quantities for distributors, OEMs, and contractors

Full Thread (ISO 4017) vs. Partial Thread (ISO 4014) — Key Differences

Feature ISO 4014 (Partial Thread) ISO 4017 (Full Thread) — This Product
Thread Coverage Partial — unthreaded shank section Full — entire shank threaded ✅
Grip Length Flexibility Fixed by unthreaded shank Adjustable — any grip length ✅
Thread Engagement Limited to threaded portion Maximum — full shank ✅
Typical Use Precision clearance-hole bolting Through-bolting, clamping, variable thickness ✅
Equivalent Standards ISO 4014 / DIN 931 ISO 4017 / DIN 933 / GB 5783

Dimensional Specifications — ISO 4017 / DIN 933 Full Thread Hex Bolts

All dimensions in millimeters (mm). Data strictly referenced from ISO 4017 / DIN 933 standard drawings and specification tables.

Thread (d) Pitch (mm) s — A/F (mm) e — A/C (mm) k — Head Height (mm) d_w min (mm) Length Range (mm)
M3 0.5 5.5 6.01 2.0 4.6 6 – 30
M4 0.7 7 7.66 2.8 5.9 8 – 40
M5 0.8 8 8.79 3.5 6.9 10 – 50
M6 1.0 10 11.05 4.0 8.9 10 – 80
M8 1.25 13 14.38 5.3 11.6 16 – 100
M10 1.5 17 18.90 6.4 14.6 20 – 120
M12 1.75 19 21.10 7.5 16.6 25 – 150
M14 2.0 22 24.49 8.8 19.6 30 – 150
M16 2.0 24 26.75 10.0 22.5 35 – 200
M18 2.5 27 30.14 11.5 24.9 40 – 200
M20 2.5 30 33.53 12.5 27.7 45 – 200
M22 2.5 34 37.72 14.0 31.4 50 – 200
M24 3.0 36 39.98 15.0 33.3 50 – 200

* s = Width across flats (A/F); e = Width across corners (A/C); k = Head height; d_w = Bearing surface diameter. All dimensions per ISO 4017 / DIN 933. For full tolerance tables, refer to the complete standard.

Standard Length Series — Available Bolt Lengths by Size

ISO 4017 / DIN 933 full thread hex bolts are available in the following standard length series (mm):

Thread Standard Lengths Available (mm)
M3 6, 8, 10, 12, 16, 20, 25, 30
M4 8, 10, 12, 16, 20, 25, 30, 35, 40
M5 10, 12, 16, 20, 25, 30, 35, 40, 45, 50
M6 10, 12, 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80
M8 16, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100
M10 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120
M12 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150
M14 30, 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150
M16 35, 40, 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200
M20 45, 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200
M24 50, 55, 60, 65, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 180, 200

* Non-standard lengths available on request. Contact FULLERKREG for custom length requirements.

Mechanical Properties — A2-70 Stainless Steel

Property A2-70 Value
Property Class A2-70 (per ISO 3506-1)
Tensile Strength (Rm) min. 700 MPa
0.2% Proof Stress (Rp0.2) min. 450 MPa
Elongation (A) min. 20%
Reduction of Area (Z) min. 50%
Hardness min. 220 HV
Hardness max. 250 HV
Charpy Impact (KV) min. 50 J (at room temperature)

A2-70 vs. A2-50 — Strength Comparison

Property A2-50 (Standard) A2-70 (High Tensile) — This Product
Tensile Strength (Rm) ≥ 500 MPa ≥ 700 MPa ✅ (+40%)
Proof Stress (Rp0.2) ≥ 210 MPa ≥ 450 MPa ✅ (+114%)
Elongation ≥ 40% ≥ 20%
Hardness ≤ 220 HV 220–250 HV
Typical Application Light-duty, general use Structural, high-load, vibration-prone ✅

Material Properties — A2 Stainless Steel (SUS304)

Property Value
Material Designation A2 / SUS304 / X 5 Cr Ni 18-10
UNS No. S30400
Corrosion Resistance Excellent — suitable for marine, food & outdoor use
Magnetic Non-magnetic (austenitic)
Operating Temperature −50°C to +300°C (continuous)

Chemical Composition — A2 (SUS304) Stainless Steel

Element C (%) Si (%) Mn (%) P (%) S (%) Cr (%) Ni (%)
A2 / X 5 Cr Ni 18-10 ≤ 0.07 ≤ 1.0 ≤ 2.0 ≤ 0.045 ≤ 0.03 17.0–19.5 8.0–10.5

Standard Cross-Reference

Standard Region Description
ISO 4017 International Hexagon head screws — full thread, product grades A and B
DIN 933 Germany / Europe Hexagon head bolts — full thread (equivalent to ISO 4017)
GB 5783 China Hexagon head bolts — full thread (equivalent to ISO 4017)
ISO 3506-1 International Mechanical properties of stainless steel fasteners — bolts, screws, studs
ISO 261 / DIN 13 International Metric coarse thread specification

Tightening Torque Reference — A2-70 Stainless Steel

Recommended tightening torques for A2-70 stainless steel hex bolts (metric coarse thread, lubricated, μ = 0.12):

Thread Torque (N·m) — 75% Proof Load Clamp Force (kN)
M3 0.5 1.5
M4 1.2 2.8
M5 2.5 4.5
M6 4.5 6.5
M8 11 12.0
M10 22 19.5
M12 38 28.5
M14 61 39.0
M16 95 51.5
M20 185 80.0
M24 320 115.0

* Torque values are for reference only. Actual torque requirements depend on friction coefficient, lubrication, joint material, and application. Always consult a qualified engineer for safety-critical applications.

Application Scenarios

  • ⚓ Marine & offshore — deck hardware, hull fittings, structural connections in salt-air environments
  • 🏭 Food & pharmaceutical processing — hygienic equipment assembly requiring non-magnetic, corrosion-resistant fasteners
  • 🏗️ Construction & structural engineering — stainless steel structural connections, curtain wall systems, façade cladding
  • 🔧 Machine building & OEM — general assembly, panel fastening, equipment enclosures
  • ⚡ Electrical & electronics — non-magnetic fastening in switchgear, control panels, and sensitive equipment
  • 🌊 Outdoor & coastal installations — signage, handrails, architectural metalwork exposed to weather
  • 🧪 Chemical & laboratory equipment — mild acid and alkali resistant environments
  • 🚗 Automotive & transportation — stainless fastening for exhaust systems, body panels, and trim

Product Gallery

FULLERKREG ISO 4017 / DIN 933 Full Thread Hex Bolts A2-70 Stainless Steel — actual product photos:

[Product Photo 1] [Product Photo 2] [Product Photo 3] [Product Photo 4]

Ordering & Packaging Information

  • Packaging: Bulk carton / polybag per size and length; custom labeling available for OEM and distributor orders
  • MOQ: Contact FULLERKREG sales for wholesale minimum order quantities
  • Lead Time: Standard stock sizes ship promptly; large-volume orders subject to production schedule
  • Certifications: Material test reports (MTR), ISO 3506-1 compliance certificates, and third-party inspection reports available on request
  • Custom Requirements: Non-standard lengths, special thread forms, and custom markings available — contact us

Frequently Asked Questions

Q: What is the difference between ISO 4017 and ISO 4014?
A: ISO 4017 (DIN 933 / GB 5783) specifies fully threaded hex bolts — the thread runs the entire length of the shank. ISO 4014 (DIN 931) specifies partially threaded hex bolts with an unthreaded shank section. Full thread bolts offer greater flexibility in grip length and maximum thread engagement.

Q: What does A2-70 mean?
A: A2 refers to the stainless steel grade (SUS304 / X 5 Cr Ni 18-10), and 70 refers to the minimum tensile strength of 700 MPa per ISO 3506-1. A2-70 is the high tensile grade, offering significantly higher strength than standard A2-50 (500 MPa minimum).

Q: Are A2-70 bolts suitable for outdoor and marine use?
A: Yes. A2 (SUS304) stainless steel provides excellent corrosion resistance for outdoor, coastal, and mildly marine environments. For prolonged seawater immersion or high-chloride environments, FULLERKREG recommends upgrading to A4-70 (SUS316) for superior pitting corrosion resistance.

Q: Are these bolts non-magnetic?
A: Yes. A2 (SUS304) is an austenitic stainless steel and is non-magnetic in the annealed condition, making it suitable for use near sensitive electronic equipment or in MRI-adjacent environments.

Q: What surface treatment is applied?
A: FULLERKREG ISO 4017 A2-70 hex bolts are acid-washed (whitened) and passivated, removing surface contamination and enhancing the natural chromium oxide passive layer for maximum corrosion resistance.

Q: What nuts and washers are compatible?
A: Use ISO 4032 / DIN 934 hex nuts (A2-70) and ISO 7089 / DIN 125 flat washers (A2) for a fully matched stainless steel assembly. FULLERKREG supplies the complete range of compatible stainless fasteners.

Q: Can I get material test reports (MTR)?
A: Yes. FULLERKREG provides material test reports and ISO 3506-1 compliance certificates upon request for wholesale and OEM orders.

FULLERKREG — Precision Fasteners to ISO/DIN/GB Standards. All technical data is provided for reference. Always verify fastener selection and torque requirements with a qualified engineer for structural and safety-critical applications.

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