Home » Full Thread Hex Bolts (DIN 933) High Tensile Stainless Steel (A2-80)

Full Thread Hex Bolts (DIN 933) High Tensile Stainless Steel (A2-80)

Full Thread Hex Bolts (DIN 933 / GB 5783) — Ultra-High Tensile Stainless Steel A2-80 (SUS304)

FULLERKREG DIN 933 / GB 5783 full thread hex bolts in A2-80 grade represent the highest strength class available in A2 stainless steel fasteners per ISO 3506-1. Manufactured from SUS304 stainless steel with a minimum tensile strength of 800 MPa, these bolts deliver exceptional clamping force and fatigue resistance while maintaining the full corrosion resistance of austenitic stainless steel. Finished with whitened passivation for maximum surface protection. The fully threaded shank ensures maximum thread engagement and grip-length flexibility for demanding structural and industrial applications.

Product Highlights

  • Brand: FULLERKREG
  • Standards: DIN 933 / GB 5783 / ISO 4017
  • Material: A2 Stainless Steel (SUS304 / X 5 Cr Ni 18-10)
  • Property Class / Strength Grade: A2-80 (Ultra-High Tensile)
  • 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 DIN 933 A2-80 Full Thread Hex Bolts?

  • ✅ A2-80 — highest stainless strength class — Rm ≥ 800 MPa, the maximum grade in ISO 3506-1 for A2 stainless steel
  • ✅ 60% stronger than A2-50 — and 14% stronger than A2-70, enabling smaller bolt sizes for the same load
  • ✅ 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 — DIN 933 / GB 5783 / ISO 4017 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

A2-80 vs. A2-70 vs. A2-50 — Strength Grade Comparison

Property A2-50 (Standard) A2-70 (High Tensile) A2-80 (Ultra-High Tensile) — This Product
Tensile Strength (Rm) min. 500 MPa 700 MPa 800 MPa ✅
Proof Stress (Rp0.2) min. 210 MPa 450 MPa 600 MPa ✅
Elongation (A) min. 40% 20% 8%
Hardness (HV) ≤ 220 220–250 250–320 ✅
ISO 3506-1 Grade A2-50 A2-70 A2-80 ✅ (Highest)
Typical Application Light-duty, general use Structural, high-load Heavy structural, vibration-critical ✅

Full Thread (DIN 933) vs. Partial Thread (DIN 931) — Key Differences

Feature DIN 931 (Partial Thread) DIN 933 (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 DIN 931 / ISO 4014 DIN 933 / ISO 4017 / GB 5783

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

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

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 DIN 933 / ISO 4017. For full tolerance tables, refer to the complete standard.

Standard Length Series — Available Bolt Lengths by Size

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 — A2-80 Stainless Steel (ISO 3506-1)

Property A2-80 Value
Property Class A2-80 (per ISO 3506-1) — Highest A2 Grade
Tensile Strength (Rm) min. 800 MPa
0.2% Proof Stress (Rp0.2) min. 600 MPa
Elongation (A) min. 8%
Reduction of Area (Z) min. 25%
Hardness min. 250 HV
Hardness max. 320 HV
Charpy Impact (KV) Not specified (cold-worked grade)
Achievable by Cold working / strain hardening of A2 austenitic stainless steel

⚠️ Note: A2-80 strength is achieved through cold working (strain hardening) of A2 stainless steel. This process increases tensile and proof strength significantly but reduces elongation compared to A2-50 and A2-70. The material remains fully austenitic and corrosion-resistant.

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 Slightly magnetic after cold working (austenitic base)
Operating Temperature −50°C to +300°C (continuous)

⚠️ Note on magnetism: Cold-worked A2-80 stainless steel may exhibit slight magnetic response due to strain-induced martensite. This does not affect corrosion resistance. For strictly non-magnetic applications, specify annealed A2-50 or A2-70 grade.

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
DIN 933 Germany / Europe Hexagon head bolts — full thread (metric)
ISO 4017 International Hexagon head screws — full thread, product grades A and B
GB 5783 China Hexagon head bolts — full thread (equivalent to DIN 933)
ISO 3506-1 International Mechanical properties of stainless steel fasteners — A2-80 grade definition
ISO 261 / DIN 13 International Metric coarse thread specification

Tightening Torque Reference — A2-80 Stainless Steel

Recommended tightening torques for A2-80 stainless steel hex bolts (metric coarse thread, lubricated, μ = 0.12). Higher proof stress vs. A2-70 allows greater preload at the same torque:

Thread Torque (N·m) — 75% Proof Load Clamp Force (kN)
M3 0.6 1.8
M4 1.5 3.4
M5 3.0 5.5
M6 5.5 8.0
M8 13 14.5
M10 27 23.5
M12 47 34.5
M14 75 47.0
M16 115 62.0
M20 225 97.0
M24 390 139.0

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

Application Scenarios

  • 🏗️ Heavy structural engineering — stainless steel structural connections requiring maximum bolt strength with corrosion resistance
  • ⚓ Marine & offshore — high-load deck hardware, hull structural connections, offshore platform fittings
  • ⚡ Power generation & energy — wind turbine assemblies, solar mounting structures, transformer connections
  • 🔧 Heavy machinery & OEM — high-vibration equipment where maximum preload and fatigue resistance are critical
  • 🏭 Chemical & petrochemical plants — high-pressure flange connections in corrosive process environments
  • 🚂 Rail & transportation infrastructure — structural fastening requiring both high strength and corrosion resistance
  • 🌊 Coastal & port infrastructure — high-load structural connections in salt-air environments
  • 🏭 Food & pharmaceutical processing — high-load hygienic equipment assembly requiring stainless fasteners

Product Gallery

FULLERKREG DIN 933 Full Thread Hex Bolts A2-80 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 A2-80 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 does A2-80 mean and how is it different from A2-70?
A: A2 refers to the stainless steel grade (SUS304), and 80 refers to the minimum tensile strength of 800 MPa per ISO 3506-1. A2-80 is the highest strength class for A2 stainless steel — 14% stronger than A2-70 (700 MPa) and 60% stronger than A2-50 (500 MPa). The higher strength is achieved through cold working (strain hardening).

Q: How is A2-80 strength achieved?
A: A2-80 strength is achieved through cold working (strain hardening) of the austenitic stainless steel. This process deforms the crystal structure to increase tensile and proof strength significantly, without changing the chemical composition or corrosion resistance of the material.

Q: Will A2-80 bolts be slightly magnetic?
A: Cold-worked A2-80 stainless steel may exhibit a slight magnetic response due to strain-induced martensite transformation. This does not affect corrosion resistance. For strictly non-magnetic applications, specify annealed A2-50 or A2-70 grade bolts instead.

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

Q: Are A2-80 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 A4-80 (SUS316) for superior pitting corrosion resistance.

Q: What nuts and washers are compatible?
A: Use ISO 4032 / DIN 934 hex nuts (A2-70 or A2-80) and ISO 7089 / DIN 125 flat washers (A2) for a fully matched stainless steel assembly. For A2-80 bolts, ensure the nut proof load is sufficient to match the bolt strength. 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 A2-80 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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