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 Anchor Bolts
Incoloy 800H anchor bolts are structural foundation fasteners machined from ASTM B408 round bar for high-temperature mounting applications where the parent structure transmits heat to the anchor and standard carbon-steel anchors would relax or oxidize. Typical service includes hot-zone heat-exchanger saddle anchoring, fired-heater support-leg bolting, refractory-anchor stud welding into vessel walls, and reformer support-shoe bolting. TorqBolt machines anchor bolts in diameter range M12 to M64 with overall lengths cut to project drawing (including bent-leg or hooked configurations on PO call-out). The standard anchor bolt is a single-end-threaded stud with a plain shank for embedment into the parent structure (concrete, fire-brick or welded boss). Every anchor bolt ships with EN 10204 type 3.1 mill test certificate documenting heat number, ASTM B408 chemistry, solution-anneal cycle and ASTM grain size 5 verification. The alloy choice is driven by sustained temperature, not by structural-design code; anchor bolt design loading is per the project structural drawing.
Anchor Bolt Dimensions (Per Project Drawing)
| Size designation | Across flats / OD | Head / nut height | Thread pitch | Standard reference |
|---|---|---|---|---|
| M12 | 12.0 mm OD | Thread length: 2.5d typical (30 mm); plain shank balance | 1.75 mm | Per print |
| M16 | 16.0 mm OD | Thread length: 2.5d (40 mm); plain shank balance | 2.0 mm | Per print |
| M20 | 20.0 mm OD | Thread length: 2.5d (50 mm); plain shank balance | 2.5 mm | Per print |
| M24 | 24.0 mm OD | Thread length: 2.5d (60 mm); plain shank balance | 3.0 mm | Per print |
| M30 | 30.0 mm OD | Thread length: 2.5d (75 mm); plain shank balance | 3.5 mm | Per print |
| M36 | 36.0 mm OD | Thread length: 2.5d (90 mm); plain shank balance | 4.0 mm | Per print |
| M48 | 48.0 mm OD | Thread length: 2.5d (120 mm); plain shank balance | 5.0 mm | Per print |
| M64 | 64.0 mm OD | Thread length: 2.5d (160 mm); plain shank balance | 6.0 mm | Per print |
Manufacturing Route at TorqBolt
Anchor bolt manufacture is print-driven; thread length, plain shank length, bend geometry and embedment-end profile are specified by the project structural drawing:
- Receive Incoloy 800H bar to ASTM B408; PMI verification on each heat.
- Cut bar to overall length per print (including bend allowance if hooked).
- Centerless grind plain shank to bar tolerance.
- Thread one end (or both ends if double-end anchor) per print: thread length 2.5d typical, class 2A or 6g.
- Cold-bend embedment end if hooked configuration (J-hook, L-hook, T-bar) per print.
- Solution anneal at 1149 deg C plateau followed by rapid quench (cold-bent areas require post-bend anneal); grain size 5 verified.
- Hardness band 120-184 HB on first piece and one per batch.
- Visual + dimensional + PMI inspection 100 percent.
- Heat-stamp grade marking on threaded end; pack with template plates and nut + washer sets per print.
Anchor Bolt Sizes Stocked and Lead Times
| Diameter range | Length range | Stock status | Lead time |
|---|---|---|---|
| M12 - M24 | 100 mm - 600 mm | Made-to-order from stock bar | 10 to 14 working days |
| M30 - M36 | 200 mm - 900 mm | Made-to-order from stock bar | 14 to 21 working days |
| M42 - M48 | 300 mm - 1200 mm | Made-to-order, large bar | 3 to 5 weeks |
| M56 - M64 | 400 mm - 1500 mm | Made-to-order, forged blank | 5 to 7 weeks |
Inspection and Heat Marking
Anchor bolt specific inspection points cover thread quality, plain shank straightness, bend radius and embedment-end profile:
- Thread engagement length verified per print.
- Plain shank straightness checked to 0.5 mm per metre over full length.
- Bend radius and bend angle verified on hooked configurations.
- Embedment-end profile verified against print (J-hook, L-hook or plate detail).
- Hardness band 120-184 HB after post-bend solution anneal.
- ASTM E112 grain-size etch verification including cold-bent areas.
- PMI by X-ray fluorescence on first piece and one per batch.
- Heat number stamped on the threaded end for traceability per ASTM B408.
Typical Service Conditions
Incoloy 800H anchor bolts are specified where the parent structure transmits heat above 540 deg C (1000 deg F) to the anchor, making carbon-steel anchors unsuitable:
- Heat exchanger saddle and support-shoe anchoring on hot-zone service.
- Ethylene cracker furnace structural-leg anchoring.
- Refractory-anchor stud welding into ASME Section VIII pressure-vessel walls.
- Reformer pigtail support-clip anchoring on hot-zone piping.
- Steam superheater tube-bank support anchoring.
- Fired-heater support-leg base-plate anchoring in petrochemical service.
Incoloy 800H Alloy Considerations on This Fastener Form
Companion Fasteners and Related Pages
- Stud Bolts: alternative when both ends are nut-engaged.
- U-Bolts: pipe-clamp alternative for line-support anchoring.
- Heavy Hex Nuts: matched nuts for anchor bolt tightening.
- Washers: matched plate washers for anchor base plates.
- Threaded Rod: cut-to-length variant for field-installed anchors.
Frequently Asked Questions
Q. Are Incoloy 800H anchor bolts qualified to ASTM F1554?
F1554 is a carbon-steel anchor bolt specification (grades 36, 55 and 105). Incoloy 800H anchor bolts are not F1554-qualified; they are dimensionally machined to the F1554 geometry on call-out but the material certificate references ASTM B408 chemistry. Structural-design loading is per the project structural drawing, not per F1554.
Q. Can anchor bolts be supplied with hooked or J-bolt configuration?
Yes. Standard supply is straight single-end-threaded stud. Hooked (J, L) and T-bar embedment ends are cold-bent to print and solution annealed post-bend to restore ASTM grain size 5.
Q. What is the maximum length for a one-piece anchor bolt?
Standard one-piece length is 1500 mm. Longer anchors are supplied as field-spliced sections with coupling nuts for joint.
Q. Is the embedment end machined to a special profile?
Per print. Common embedment profiles are plain stud (concrete grout-cast), J-hook (concrete grout-cast), L-hook (concrete grout-cast) and plate-on-end (welded baseplate for refractory anchor).
Q. Are template plates supplied with anchor bolt sets?
Yes on PO call-out. Carbon-steel or stainless-steel template plates with drilled hole pattern matching the anchor bolt set are supplied on request for field installation.
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