DIN 580 Lifting Eye Bolts
DIN 580 · M6 – M64 · C15E / A2 / A4The metric lifting eye bolt, forged with eye and collar in one piece. It has ratings for vertical, 45° pair and 90° in-plane loads, and the same eye sizes across manufacturers.
DIN 580 Forged Lifting Eye Bolts & ASME B18.15 Shoulder Eyebolts: Manufacturer & Distributor
A lifting eye bolt screws into a tapped hole and gives a hook or shackle a safe place to lift. The eye and collar are forged in one piece. The collar seats on the surface and carries the side loads that would otherwise bend the thread.
Exotic Alloy manufactures lifting eye bolts in Mumbai, India. Metric eye bolts follow DIN 580, and inch shoulder and plain pattern eyebolts follow ASME B18.15 and ASTM A489. Every eye bolt is drop forged from certified bar, machined, threaded, and proof load tested in lots. We supply machine builders and rigging distributors across India, and export to Nigeria, Africa, the Gulf and Europe.
Ready Stock & Load-Tested Supply
DIN 580 M8 to M36 in zinc-plated C15E and in A2 / A4 stainless ship from stock. Larger sizes, inch eyebolts, hot-dip galvanised finishes and exotic alloys are made to order.
M6 – M64 | ¼ – 2″
Drop forged eye & collar
WLL from 75 to 16,000 kg
Proof load tested
CE-marked DIN 580 on request
Eye bolt at a glance
- Form
- Forged ring (eye) with collar and threaded shank
- Standards
- DIN 580 (metric), ASME B18.15 & ASTM A489 / F541 (inch)
- Material
- C15E (1.1141); stainless 1.4301 (A2), 1.4401 (A4)
- Rating
- Working load limit (WLL) by size and direction of pull
- Temperature
- −20 to +200 °C at full rating (DIN 580)
- Related
- Eye nuts, custom lifting points
Eye Bolt Specification
The range we manufacture and supply.
StandardsDIN 580 lifting eye bolts (made to the edition you specify; DIN 580:2024 is current); ASME B18.15 forged eyebolts; ASTM A489 carbon steel and ASTM F541 alloy steel eyebolts; DIN 444 eye bolts (non-lifting)
Size rangeDIN 580 M6 to M64 (M72×6, M80×6, M100×6 to order); inch ¼″ to 2″ UNC; long-shank and fine-thread versions to drawing
RatingsDIN 580: 75 kg (M6) to 16,000 kg (M64) single vertical; separate 45° pair and 90° ratings. Inch shoulder: 650 lb (¼″) to 40,000 lb (2″) vertical, derated with angle
ConstructionClosed-die drop forged eye and collar in one piece; machined bearing face; rolled or cut thread; no welds
MaterialsC15E (1.1141) case-hardening steel; stainless 1.4301 (A2 / 304) and 1.4401 (A4 / 316); C1030 / C1035 carbon steel for A489; alloy steel for F541; duplex and nickel alloys to order
TemperatureDIN 580: −20 to +200 °C without reduction of WLL. Outside this range, consult us for a reduced rating or another material
FinishSelf-colour, zinc electroplated (blue or yellow passivated), hot-dip galvanised, painted; passivated stainless
MarkingManufacturer's mark, thread size and batch number; CE mark on DIN 580 eye bolts for the EU on request; material grade on stainless
CertificationEN 10204 3.1 with heat number, proof load and hardness; declaration of conformity; MPI and EN 10204 3.2 on request
PackingBoxes by size with label showing standard, size, WLL, material, quantity and batch; operating instructions supplied with every carton
Types of Eye Bolts We Manufacture
The most important question is whether the eye bolt is for lifting. Only forged, rated eye bolts may carry a suspended load.
Shoulder Pattern Eyebolts
ASME B18.15 Type 2 · ASTM A489 · ¼ – 2″The inch equivalent of DIN 580. The forged shoulder seats on the surface, so the eyebolt can take angled loads up to 45° at reduced capacity.
Plain Pattern Eyebolts
ASME B18.15 Type 1 · vertical lifts onlyA straight shank with no shoulder, for in-line vertical lifting only, or through-bolted with a nut. Any angle bends the shank.
Stainless Steel Eye Bolts
DIN 580 in 1.4301 (A2) and 1.4401 (A4)Forged stainless eye bolts for food plants, marine equipment, chemical plants and outdoor installations, proof tested to the same ratings as steel.
Eye Bolts for Fastening (Non-Lifting)
DIN 444 · long thread, no collarFor tie-downs, guy wires, hinges and adjusting rods. They have no lifting rating and are marked and packed separately from lifting eye bolts.
Exotic Alloy Eye Bolts
Duplex · Inconel · Monel · HastelloyDIN 580 geometry in corrosion-resistant alloys for offshore and chemical service. Their WLL is set by design and proof test and is stated on the certificate.
Eye Bolt Dimensions & Working Load Limits
DIN 580 values as published in the 2018 edition tables and in manufacturers' DIN 580 data. Inch values are the ratings of forged shoulder pattern eyebolts proof tested to ASTM A489. The WLL marked on the eye bolt or stated on its certificate always governs.
| Size | Thread length l mm | Eye inside d4 mm | Eye outside d3 mm | Collar d2 mm | Height h mm | WLL 0° single, axial, kg | WLL 45° two-leg sling, kg | WLL 90° in eye plane, kg |
|---|---|---|---|---|---|---|---|---|
| M6 | 13 | 20 | 36 | 20 | 36 | 75 | 55 | 38 |
| M8 | 13 | 20 | 36 | 20 | 36 | 140 | 100 | 70 |
| M10 | 17 | 25 | 45 | 25 | 45 | 230 | 170 | 115 |
| M12 | 20.5 | 30 | 54 | 30 | 53 | 340 | 240 | 170 |
| M14 | 27 | 35 | 63 | 35 | – | 490 | 350 | 245 |
| M16 | 27 | 35 | 63 | 35 | 62 | 700 | 500 | 350 |
| M18 | 30 | 40 | 72 | 40 | – | 850 | 600 | 425 |
| M20 | 30 | 40 | 72 | 40 | 71 | 1,200 | 860 | 600 |
| M22 | 36 | 50 | 90 | 50 | – | 1,400 | 1,000 | 700 |
| M24 | 36 | 50 | 90 | 50 | 90 | 1,800 | 1,290 | 900 |
| M27 | 45 | 60 | 108 | 65 | – | 2,100 | 1,500 | 1,050 |
| M30 | 45 | 60 | 108 | 65 | 109 | 3,200 | 2,300 | 1,600 |
| M36 | 54 | 70 | 126 | 75 | 128 | 4,600 | 3,300 | 2,300 |
| M42 | 63 | 80 | 144 | 85 | – | 6,300 | 4,500 | 3,150 |
| M48 | 68 | 90 | 166 | 100 | – | 8,600 | 6,100 | 4,300 |
| M56 | 78 | 100 | 184 | 110 | – | 11,500 | 8,200 | 5,750 |
| M64 | 90 | 110 | 206 | 120 | – | 16,000 | 11,000 | 8,000 |
Dimensions in mm, WLL in kg. h is given for the sizes where it is published. The 45° value is the total load for two eye bolts with sling legs up to 45° from vertical, in the plane of the eye. Some catalogues state it per eye bolt or list slightly lower figures (for example 830 kg for M20), so we use the conservative total-load reading. The 90° value is for a single eye bolt pulled at right angles to its axis in the plane of the eye.
| Size | Threads / in UNC | Shank length in | Eye inside in | Eye outside in | Overall length in | WLL 0° lb (kg) | WLL at 45° 30 %, lb (kg) |
|---|---|---|---|---|---|---|---|
| 1/4″ | 20 | 1 | 3/4 | 1-3/16 | 2-3/8 | 650 (295) | 195 (88) |
| 5/16″ | 18 | 1-1/8 | 7/8 | 1-7/16 | 2-13/16 | 1,200 (544) | 360 (163) |
| 3/8″ | 16 | 1-1/4 | 1 | 1-11/16 | 3-9/32 | 1,550 (703) | 465 (211) |
| 7/16″ | 14 | 1-3/8 | 1-1/16 | 1-13/16 | 3-9/16 | 2,000 (907) | 600 (272) |
| 1/2″ | 13 | 1-1/2 | 1-3/16 | 2-1/8 | 3-31/32 | 2,600 (1,179) | 780 (354) |
| 9/16″ | 12 | 1-5/8 | 1-1/4 | 2-5/16 | 4-1/2 | 3,200 (1,451) | 960 (435) |
| 5/8″ | 11 | 1-3/4 | 1-3/8 | 2-9/16 | 4-3/4 | 5,200 (2,359) | 1,560 (708) |
| 3/4″ | 10 | 2 | 1-1/2 | 2-13/16 | 5-1/4 | 7,200 (3,266) | 2,160 (980) |
| 7/8″ | 9 | 2-1/4 | 1-11/16 | 3-3/16 | 5-31/32 | 10,600 (4,808) | 3,180 (1,442) |
| 1″ | 8 | 2-1/2 | 1-13/16 | 3-9/16 | 6-5/8 | 13,300 (6,033) | 3,990 (1,810) |
| 1-1/8″ | 7 | 2-3/4 | 2 | 4-1/16 | 7-21/32 | 17,000 (7,711) | 5,100 (2,313) |
| 1-1/4″ | 7 | 3 | 2-3/16 | 4-7/16 | 8-7/32 | 21,000 (9,525) | 6,300 (2,858) |
| 1-1/2″ | 6 | 3-1/2 | 2-1/2 | 5-3/16 | 9-15/32 | 24,000 (10,886) | 7,200 (3,266) |
| 1-3/4″ | 5 | 3-3/4 | 2-7/8 | 6 | 10-13/16 | 32,000 (14,515) | 9,600 (4,354) |
| 2″ | 4.5 | 4 | 3-3/8 | 6-7/8 | 11-7/8 | 40,000 (18,144) | 12,000 (5,443) |
Dimensions in inches. WLL is for a 0° vertical pull; the 45° column applies the 30 % factor for pulls of 31 to 45° from the bolt axis. Ratings for inch eyebolts differ between manufacturers, so always use the rating of the eyebolt actually supplied.
Eye Bolt Load Capacity by Angle & Size Selector
An eye bolt is strongest when pulled straight along its axis. Every degree of angle adds bending at the collar, so the allowed load falls quickly.
Eye bolt size selector
One eye bolt, straight vertical pull: load ≤ WLL at 0°.
Smallest suitable size
M16
eye bolt size
71 %
of rated capacity
Capacity in this arrangement:700 kg
Load per eye bolt:500 kg
Next size up:M18
A selection aid, not a lift plan. It assumes the load is shared equally between eye bolts, the eye is aligned with the sling leg, and each eye bolt is fully seated in a sound thread. Unequal leg lengths or an off-centre load put more on one eye bolt; a competent person must plan every lift.
How to Install and Use Lifting Eye Bolts Safely
The ratings only apply when the eye bolt is installed correctly. Most eye bolt failures start with a collar that was not seated.
Do
- Tap the hole with full thread at least as deep as the eye bolt thread (l in the table)
- Use a flat, square bearing surface and screw in until the collar seats fully
- Align the plane of the eye with the sling leg before an angled lift
- Give each eye bolt its own sling leg, shackle or hook
- Check the base material: the ratings assume properties comparable to the eye bolt
Don't
- Back the eye bolt off to line up the eye: use a swivel lifting point instead
- Reeve one sling through two eye bolts
- Weld, heat, grind, bend or re-straighten an eye bolt
- Put washers or spacers under a DIN 580 collar to change its height
- Use a non-lifting or unmarked eye bolt to lift
Eye Bolt Materials & Grades
A lifting eye bolt needs toughness more than hardness. Low-carbon forging steels and austenitic stainless steels give that toughness down to the bottom of the rated temperature range.
C15E (1.1141)
DIN 580 steel eye boltsA low-carbon case-hardening steel to EN 10084 with excellent forgeability and toughness. It is the standard material for DIN 580 eye bolts, and is close to AISI 1015.
Exotic alloy eye bolts: minimum properties of the bar we make them from
| Alloy | UNS | Condition supplied | Tensile min MPa | Yield 0.2 % min MPa | Elongation % | Why it is chosen for hex bolts |
|---|---|---|---|---|---|---|
| Inconel 625 | N06625 | Solution annealed (Grade 1) | 827 | 414 | 30 | Seawater, sour gas, cryogenic to 980 °C oxidation; subsea flange bolting |
| Inconel 718 | N07718 | Solution treated + aged (AMS 5662) | 1240 | 1035 | 12 | Highest strength to 650 °C; turbine and wellhead bolting |
| Monel 400 | N04400 | Hot-finished annealed | 517 | 207 | 35 | Seawater, hydrofluoric acid, no chloride SCC; marine and valve bolting |
| Monel K-500 | N05500 | Age hardened (AMS 4676) | 960 | 690 | 18 | Monel 400 corrosion resistance with three times the yield; pump shafts, subsea |
| Hastelloy C-276 | N10276 | Solution annealed (ASTM B574) | 690 | 283 | 40 | Wet chlorine, hot acids, mixed oxidising / reducing media; chemical reactors |
| Incoloy 825 | N08825 | Annealed (ASTM B425) | 586 | 241 | 30 | Sulphuric and phosphoric acid, sour gas (NACE MR0175); pickling plant |
| Duplex 2205 | S32205 | Solution annealed | 655 | 450 | 25 | Twice the yield of 316 with chloride SCC resistance; offshore topsides |
| Super Duplex 2507 | S32750 | Solution annealed | 750 | 550 | 15 | PREN > 40; seawater and desalination bolting |
| Titanium Grade 5 | R56400 | Annealed (ASTM B348) | 895 | 828 | 10 | Half the weight of steel, immune to seawater; aerospace and chemical |
| A-286 | S66286 | Solution treated + aged | — | — | — | Iron-base superalloy for 650 °C bolting; on request with certified values |
Bar minimums from the linked datasheets for the supply condition shown. An exotic alloy eye bolt is not covered by the DIN 580 load table: its WLL is calculated for the alloy, confirmed by proof load testing and stated on the certificate.
How Our Eye Bolts Are Made
A lifting eye bolt is a safety part, so it is forged in one piece and tested before it ships.
1
Certified bar
C15E, stainless or alloy bar received by heat with mill certificates, cut to forging billets and marked for traceability.
2
Induction heating
Billets heated to forging temperature in an induction coil for uniform heat and minimal scale.
3
Closed-die drop forging
Eye, collar and shank are forged together in closed dies, so the grain follows the ring. The eye is never bent or welded.
4
Trimming & heat treatment
Flash trimmed and the forging heat treated to the condition specified for the material.
5
Machining & threading
Collar bearing face turned square to the axis, shank turned and the thread rolled or cut to 6g or UNC 2A.
6
Crack testing
Magnetic particle inspection of steel forgings, or dye penetrant on stainless, to the agreed sampling plan.
7
Proof load & marking
Proof load test per lot, finish applied, and each eye bolt marked with size, maker and batch.
Finishes
| Finish | Specification | Corrosion | Notes |
|---|---|---|---|
| Zinc electroplate | ISO 4042 / ASTM F1941 | Indoor, moderate | The usual DIN 580 steel finish, blue or yellow passivated |
| Hot-dip galvanised | ISO 10684 / ASTM F2329 | Outdoor, long life | Thread made to suit the coating; for structures and outdoor equipment |
| Self-colour | Oiled | Temporary protection | For eye bolts that will be painted with the machine |
| Painted | To customer colour | Outdoor | Bright colours make lifting points easy to find on large equipment |
| Passivated | ASTM A967 / A380 | Full stainless resistance | Standard for A2 and A4 eye bolts |
Where Our Eye Bolts Are Used
Motors, gearboxes & pumps
Fitted lifting points on electric motors, gear units, pumps and compressors.
Moulds, dies & fixtures
Handling injection moulds, press tools and heavy fixtures during set-up.
Transformers & switchgear
Lifting points on transformer tanks, panels and electrical enclosures.
Marine & offshore
A4, duplex and Monel eye bolts on deck equipment, hatches and skids.
Food & pharma equipment
Stainless eye bolts on mixers, tanks and covers that must be washed down.
Rigging & tie-down
Anchor points for guy wires and tie-downs, using non-lifting DIN 444 eye bolts where no lift is involved.
Eye Bolt Inspection Before Every Lift
Take an eye bolt out of service if any of these checks fail. Never repair it.
| Check | Reject if |
|---|---|
| Marking | Size, maker or batch marking is missing or unreadable |
| Eye | Bent, twisted, stretched or out of plane with the shank; nicks or gouges on the ring |
| Collar / shoulder | Bearing face damaged, not square, or shows signs of having been loaded unseated |
| Thread | Damaged, worn or stretched thread, or a thread that will not run in by hand |
| Cracks & corrosion | Any crack; pitting or corrosion that reduces the section |
| Heat & modification | Weld spatter, heat discoloration, grinding or any modification |
| Tapped hole | Damaged, shallow or worn thread in the part being lifted |
Eye Bolt Testing & Certification
| Test | Method | Applied to |
|---|---|---|
| Chemical analysis / PMI | Mill certificate; XRF PMI | Every heat; stainless and exotic alloy lots |
| Proof load | Static axial load above the WLL, then visual and dimensional check for deformation | Every lot |
| Breaking test | Load to failure on samples | Type and lot qualification |
| Crack testing | Magnetic particle (steel) or dye penetrant (stainless) | Agreed sampling; 100 % on request |
| Hardness | Brinell or Rockwell | Every heat-treatment lot |
| Dimensions & thread | Eye, collar, thread length; thread gauges | Every lot |
Every eye bolt lot ships with
- EN 10204 3.1 certificate with heat number
- Proof load test results
- Hardness and dimensional report
- WLL table and operating instructions
On request
- Declaration of conformity for CE-marked DIN 580
- 100 % magnetic particle inspection
- EN 10204 3.2 witnessed by TUV, DNV, Lloyd's, BV or SGS
- Individual serial numbers and test tags
Eye Bolt Questions, Answered
A lifting eye bolt is a bolt with a forged ring (the eye) and a collar, screwed into a tapped hole so that a hook or shackle can lift the part. The collar seats on the surface and takes side loads that would otherwise bend the thread. Metric lifting eye bolts are made to DIN 580 and inch eyebolts to ASME B18.15 and ASTM A489. Bent-wire and welded eye bolts are not lifting eye bolts and must never be used for lifting.
It depends on size and direction of pull. An M12 DIN 580 eye bolt is rated 340 kg for a single vertical lift, 240 kg for a pair with sling legs up to 45 degrees, and 170 kg for a pull at 90 degrees in the plane of the eye. An M20 is rated 1,200, 860 and 600 kg. The full table from M6 (75 kg) to M64 (16,000 kg) is on this page; the rating marked on the eye bolt or its certificate always governs.
Only in the plane of the eye and only at reduced load. DIN 580 gives separate ratings for 45 and 90 degrees, about 70 and 50 percent of the vertical rating. Inch shoulder pattern eyebolts keep 80 percent up to 15 degrees, 65 percent up to 30 degrees and 30 percent up to 45 degrees; beyond 45 degrees they must not be used. Plain pattern eyebolts without a shoulder are for vertical lifts only. A pull across the plane of the eye is never permitted; use a swivel lifting point instead.
A plain pattern eyebolt has a straight shank with no shoulder, so any sideways load bends the shank; it is rated for vertical lifts only. A shoulder pattern eyebolt has a forged shoulder, like the collar of a DIN 580 eye bolt, that seats on the surface and supports angled loads up to 45 degrees at the reduced ratings. Both are covered by ASME B18.15.
Manufacturers usually publish the same working load limits for A2 (1.4301) and A4 (1.4401) stainless DIN 580 eye bolts as for C15E steel, and our stainless eye bolts are proof tested to the same values. Because this is a manufacturer rating, always check the load marked on the eye bolt or stated on its certificate.
The tapped thread must be at least as long as the eye bolt thread, for example 30 mm for an M20 DIN 580 eye bolt, so that the collar seats flat on the surface with the full thread engaged. The ratings assume a base material with mechanical properties comparable to the eye bolt. In aluminium, cast iron or other softer materials, a longer thread engagement is needed; ask us for the joint to be checked.
DIN 580 eye bolts may be used from minus 20 to plus 200 degrees Celsius without reducing the working load limit. Outside that range, the rating must be reduced or a different material chosen. For inch eyebolts, ASTM A489 carbon steel refers low-temperature service to ASTM F541 alloy steel eyebolts.
Each lot is proof load tested and supplied with an EN 10204 3.1 certificate giving the heat number, material, proof load and hardness results, plus a dimensional report. A declaration of conformity for CE-marked DIN 580 eye bolts, magnetic particle crack testing and third-party witnessed EN 10204 3.2 certificates are available on request.