Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
Incoloy 800H Eye Bolts
Incoloy 800H eye bolts (DIN 580 / ISO 3266) are forged-eye lifting fasteners machined from ASTM B564 forged blanks and finish-machined for high-temperature lifting and tie-down applications on furnace components, heat-exchanger tube bundles and vessel-internal lifting points. The eye bolt carries a forged circular eye for shackle attachment, a hex collar for wrench-tightening and a threaded shank for installation into a tapped boss. TorqBolt manufactures eye bolts in diameter range M8 to M48 with eye-ID and shank-thread length per DIN 580. The standard configuration follows DIN 580 (collared eye bolt); DIN 582 (collared eye nut) is supplied as a companion item on PO call-out. Every eye bolt ships with EN 10204 type 3.1 mill test certificate documenting heat number, ASTM B564 chemistry, solution-anneal cycle and ASTM grain size 5 verification, plus proof-load test certificate to DIN 580 working load limit (WLL) on PO call-out for lifting-equipment scope.
Eye Bolt Dimensions (DIN 580)
| Size designation | Across flats / OD | Head / nut height | Thread pitch | Standard reference |
|---|---|---|---|---|
| M8 | 8.0 mm OD | Eye ID 20 mm; WLL axial 140 kg; thread length 13 mm | 1.25 mm | DIN 580 |
| M10 | 10.0 mm OD | Eye ID 25 mm; WLL axial 230 kg; thread length 17 mm | 1.5 mm | DIN 580 |
| M12 | 12.0 mm OD | Eye ID 30 mm; WLL axial 340 kg; thread length 20.5 mm | 1.75 mm | DIN 580 |
| M16 | 16.0 mm OD | Eye ID 35 mm; WLL axial 700 kg; thread length 27 mm | 2.0 mm | DIN 580 |
| M20 | 20.0 mm OD | Eye ID 40 mm; WLL axial 1200 kg; thread length 30 mm | 2.5 mm | DIN 580 |
| M24 | 24.0 mm OD | Eye ID 50 mm; WLL axial 1800 kg; thread length 36 mm | 3.0 mm | DIN 580 |
| M30 | 30.0 mm OD | Eye ID 60 mm; WLL axial 3200 kg; thread length 45 mm | 3.5 mm | DIN 580 |
| M36 | 36.0 mm OD | Eye ID 72 mm; WLL axial 4800 kg; thread length 54 mm | 4.0 mm | DIN 580 |
| M42 | 42.0 mm OD | Eye ID 86 mm; WLL axial 7500 kg; thread length 63 mm | 4.5 mm | DIN 580 |
| M48 | 48.0 mm OD | Eye ID 95 mm; WLL axial 9500 kg; thread length 72 mm | 5.0 mm | DIN 580 |
Manufacturing Route at TorqBolt
Eye bolt manufacture starts from a forged blank to ensure the eye-and-collar transition is forged not machined, then finish-machined for thread and hex-collar tolerance:
- Receive Incoloy 800H forged blank to ASTM B564; verify forging cycle and PMI.
- Visually inspect forged eye for forging defects, laps and surface inclusions.
- CNC turn shank to print OD; face shank-end square.
- Mill hex collar per DIN 580 across-flats.
- Drill or finish-machine eye ID to DIN 580 tolerance.
- Thread roll the shank: class 6g per ISO 965; ring + plug gauge verification.
- Solution anneal at 1149 deg C plateau followed by rapid quench; ASTM grain size 5 verified.
- Hardness band 120-184 HB; proof-load test to DIN 580 WLL on PO call-out.
- Visual + dimensional + PMI inspection 100 percent; heat-stamp grade + WLL marking on the eye.
Eye Bolt Sizes Stocked and Lead Times
| Diameter range | Length range | Stock status | Lead time |
|---|---|---|---|
| M8 - M16 | DIN 580 standard | Stock + ex-stock | 10 working days |
| M20 - M24 | DIN 580 standard | Made-to-order from forged blank | 3 to 4 weeks |
| M30 - M36 | DIN 580 standard | Made-to-order, forged blank | 4 to 6 weeks |
| M42 - M48 | DIN 580 standard | Made-to-order, large forged blank | 6 to 8 weeks |
Inspection and Heat Marking
Eye bolt inspection covers forging-defect detection, proof-load test, eye geometry and thread compliance:
- Forged eye visual inspection for laps, surface inclusions and forging defects.
- Eye ID verified per DIN 580 tolerance.
- Hex collar across-flats verified with go / no-go gauge.
- Thread engagement verified with class 6g ring + plug gauges.
- Proof-load test to DIN 580 WLL on PO call-out; certificate logged.
- Hardness band 120-184 HB on first piece and one per batch.
- ASTM E112 grain-size etch verification.
- Heat number + WLL marking stamped on the eye for lifting-equipment traceability.
Typical Service Conditions
Eye bolts are specified as lifting and tie-down points on high-temperature equipment where carbon-steel eye bolts would oxidize at elevated temperature:
- Heat exchanger tube-bundle lifting eyes on hot-zone exchangers.
- ASME Section VIII pressure-vessel internal-component lifting points.
- Reformer catalyst-tube lifting eyes during planned turnaround.
- Furnace component retort and muffle-liner lifting points.
- Ethylene cracker coil and pigtail lifting on shutdown.
- Steam superheater tube-bank section lifting on planned outages.
Incoloy 800H Alloy Considerations on This Fastener Form
Companion Fasteners and Related Pages
- Anchor Bolts: structural foundation-anchor alternative.
- Hex Bolts: standard hex-head alternative for non-lifting applications.
- Socket Head Cap Screws: Allen-drive alternative for restricted-clearance assemblies.
- Hex Nuts: matched nuts for eye-bolt through-bolting.
- Washers: spacer washers for eye-bolt installation.
Frequently Asked Questions
Q. What is the working load limit for an Incoloy 800H eye bolt?
WLL is per DIN 580 axial-pull schedule. M12 = 340 kg, M24 = 1800 kg, M36 = 4800 kg, M48 = 9500 kg. WLL at angle is reduced per DIN 580 angle-derating chart; do not exceed 45 degrees from axial.
Q. Is the eye forged or machined from bar?
Forged. The eye-and-collar geometry is produced from a ASTM B564 forged blank to retain grain flow continuity around the eye. Machined-from-bar eye bolts are NOT supplied because the bar grain flow is interrupted at the eye transition, reducing lifting capacity.
Q. Is proof-load testing included?
Standard supply includes proof-load test on first piece and one per batch with results logged on the EN 10204 certificate. 100 percent proof-load test is supplied on PO call-out for lifting-equipment scope.
Q. Can eye bolts be supplied to ASME B30.26 lifting standard?
B30.26 is a US lifting-equipment standard that references RFID-marked lifting hardware. TorqBolt machines Incoloy 800H eye bolts to DIN 580 dimensional geometry by default; B30.26-compliant marking is supplied on PO call-out.
Q. What is the maximum service temperature for an eye bolt under load?
Sustained load above 540 deg C requires elevated-temperature WLL derating per the lifting-equipment supplier guidance. Incoloy 800H structural integrity is retained to 815 deg C but lifting WLL must be derated for time-at-temperature service.
Request a Quote
Satisfaction Survey
