Lifting Eye Bolts (DIN 580) — Forged Marine Stainless Steel A4 (SUS316)

FULLERKREG DIN 580 lifting eye bolts in A4 marine stainless steel (SUS316) represent the premium choice for lifting and rigging in the most demanding corrosive environments. Precision drop-forged and finished with a whitened passivation treatment, these eye bolts deliver outstanding resistance to chlorides, seawater, and industrial chemicals — far exceeding the performance of standard A2 stainless steel.

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Product Highlights

• Brand: FULLERKREG
• Standard: DIN 580 / ISO 3266
• Material: A4 Marine Stainless Steel (SUS316 / X 2 Cr Ni Mo 17-12-2)
• Manufacturing Process: Forged (Drop Forged)
• Surface Treatment: Whitened & Passivated (酸洗钝化)
• Property Class: A4-316 (Marine Grade Stainless)
• Size Range: M6 – M48
• Thread: Metric coarse thread per DIN 13

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Why Choose FULLERKREG DIN 580 Forged A4 Marine Eye Bolts?

• ✅ A4 (SUS316) marine grade — molybdenum-enhanced alloy for superior chloride and seawater resistance vs. standard A2
• ✅ Forged construction — refined grain structure, higher fatigue strength and impact toughness vs. cast alternatives
• ✅ Passivated finish — enhanced chromium oxide passive layer for maximum long-term corrosion protection
• ✅ DIN 580 / ISO 3266 compliant — internationally recognized standard for safe lifting operations
• ✅ Full size range M6–M48 — from light rigging to heavy industrial and offshore lifting
• ✅ Non-magnetic (austenitic) — ideal for sensitive electronic and MRI-adjacent environments
• ✅ Wholesale & bulk supply — available in large quantities for distributors, shipyards, and OEMs

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Dimensional Specifications — DIN 580 Lifting Eye Bolts

All dimensions in millimeters (mm). Working load limits (WLL) are for axial (vertical, 0°) loading only. Reduce WLL per DIN 580 for angular loading.

Thread (d)	d1 (mm)	D (mm)	A (mm)	H (mm)	h (mm)	C (mm)	e (mm)	S (mm)	k (mm)	WLL 0° (kg)	WLL 45° (kg)	WLL 90° (kg)
M6	6	20	11	30	11	6	13	4	5	160	80	80
M8	8	25	14	38	14	8	17	5	6	280	140	140
M10	10	32	18	48	18	10	21	6	8	450	225	225
M12	12	38	21	56	21	12	25	7	9	630	315	315
M16	16	50	28	74	28	16	33	9	12	1120	560	560
M20	20	60	34	90	34	20	41	11	15	1800	900	900
M24	24	72	40	108	40	24	49	13	18	2500	1250	1250
M30	30	90	50	135	50	30	62	16	22	4000	2000	2000
M36	36	110	60	162	60	36	74	19	27	6300	3150	3150
M42	42	125	70	188	70	42	86	22	31	8000	4000	4000
M48	48	140	80	212	80	48	98	25	35	10000	5000	5000

* WLL values are for axial loading (0°). At 45° and 90° sling angles, WLL is reduced to 50% per DIN 580. Always verify with the applicable safety standard before use in safety-critical applications.

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Material & Mechanical Properties — A4 Marine Stainless Steel

Property	Value
Material Designation	A4 / SUS316 / X 2 Cr Ni Mo 17-12-2
UNS No.	S31600
Tensile Strength (Rm)	≥ 500 MPa (nom.)
Yield Strength (Rp0.2)	≥ 210 MPa
Elongation (A5)	≥ 40%
Hardness	≤ 250 HV
Corrosion Resistance	Excellent — superior to A2 in chloride & marine environments
Magnetic	Non-magnetic (austenitic)
Key Advantage vs. A2	Molybdenum (Mo) addition — enhanced pitting & crevice corrosion resistance

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Chemical Composition — A4 (SUS316) Marine Stainless Steel

Element	C (%)	Si (%)	Mn (%)	P (%)	S (%)	Cr (%)	Ni (%)	Mo (%)
A4 / X 2 Cr Ni Mo 17-12-2	≤ 0.03	≤ 1.0	≤ 2.0	≤ 0.045	≤ 0.03	16.5–18.5	10.0–13.0	2.0–2.5

The addition of Molybdenum (Mo 2.0–2.5%) is the defining characteristic of A4/316 stainless steel, providing significantly enhanced resistance to pitting corrosion in chloride-rich environments such as seawater, de-icing salts, and industrial chemicals.

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A4 vs. A2 — Why Marine Grade Matters

Property	A2 (SUS304)	A4 (SUS316) — This Product
Molybdenum Content	None	2.0–2.5% ✅
Seawater Resistance	Moderate	Excellent ✅
Pitting Corrosion Resistance	Good	Superior ✅
Crevice Corrosion Resistance	Moderate	Superior ✅
Chemical / Acid Resistance	Good	Excellent ✅
Recommended for Marine Use	Limited	Yes ✅
Food & Pharma Grade	Yes	Yes ✅

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Loading Angle Reduction Factors (DIN 580)

DIN 580 mandates WLL reduction when the lifting angle deviates from vertical (0°). The following factors apply to all sizes:

Sling Angle (from vertical)	WLL Reduction Factor	Example: M20 WLL
0° (axial / vertical)	1.00 (100%)	1,800 kg
Up to 45°	0.50 (50%)	900 kg
45° – 90°	0.50 (50%)	900 kg

⚠️ For angular loading exceeding 45°, always consult a qualified rigging engineer. Never exceed the rated WLL. For frequent multi-directional loading, consider swivel hoist rings.

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Application Scenarios

• ⚓ Marine & offshore — deck fittings, anchor points, mooring equipment, subsea rigging
• 🏗️ Shipbuilding & shipyards — hull assembly, engine lifting, structural rigging in salt-air environments
• 🌊 Coastal & port infrastructure — jetties, pontoons, harbour equipment exposed to seawater spray
• 🏭 Chemical & petrochemical plants — lifting in chloride-rich, acidic, or caustic process environments
• 🔬 Food, beverage & pharmaceutical — hygienic lifting in wash-down environments requiring non-magnetic, high-purity stainless
• 🌡️ Desalination & water treatment — high-chloride process environments
• 🔧 Heavy machinery & OEM — attachment points for equipment operating in harsh outdoor or coastal conditions

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Product Gallery

FULLERKREG DIN 580 Forged Marine Stainless Steel A4 Lifting Eye Bolts — actual product photos:

[Product Photo 1]

[Product Photo 2]

[Product Photo 3]

[Product Photo 4]

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Ordering & Packaging Information

• Packaging: Bulk carton / polybag per size; 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) and third-party inspection certificates available on request
• Custom Sizes: Non-standard sizes, special thread forms, and custom markings available — contact us

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Frequently Asked Questions

Q: What makes A4 (SUS316) better than A2 (SUS304) for marine applications?
A: A4 stainless steel contains 2.0–2.5% Molybdenum, which dramatically improves resistance to pitting and crevice corrosion caused by chloride ions in seawater and salt-laden atmospheres. A2 lacks this element and can suffer pitting failure in prolonged marine exposure.

Q: Are these eye bolts suitable for permanent offshore installation?
A: FULLERKREG A4 DIN 580 eye bolts are suitable for marine and offshore environments. For permanent subsea or splash-zone installations, consult a qualified structural engineer and verify compliance with applicable offshore standards.

Q: What is the difference between DIN 580 and DIN 582?
A: DIN 580 covers lifting eye bolts (threaded shank, screws into a tapped hole), while DIN 582 covers lifting eye nuts (internal thread, used on a bolt or stud). Both are used in rigging but serve different attachment configurations.

Q: Are these eye bolts suitable for side or angular loading?
A: DIN 580 eye bolts are designed primarily for axial (vertical) loading. For angular loading, the WLL must be reduced per DIN 580 reduction factors (50% at 45°–90°). For frequent multi-directional loading, swivel hoist rings are recommended.

Q: What surface treatment is applied?
A: FULLERKREG DIN 580 A4 eye bolts are acid-washed (whitened) and passivated, removing surface contamination and enhancing the natural chromium-molybdenum oxide passive layer for maximum corrosion resistance.

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

Q: What thread standard is used?
A: All threads are metric coarse (ISO/DIN 13), compatible with standard metric tapped holes.

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FULLERKREG — Precision Fasteners to DIN/ISO Standards. All technical data is provided for reference. Always verify load ratings with a qualified engineer before use in safety-critical lifting applications.