Special alloy long-shank flange bolts
For deep housings and thick bracket stacks, grip length places the thread beyond the joint while the integral flange provides the head-side bearing seat. Select under-flange length, shank transition and flange diameter together with the special-alloy grade.
- Head
- Integral flange
- Shank
- Extended plain grip
- Length basis
- Under flange
- Threads
- Metric · UNC · UNF · UNJ
- Materials
- Nickel alloys · Duplex steels · Titanium
EN 10204 3.1 MTC · Heat traceability
Long-shank flange bolts material selection
Equipment & applications
Pump casings
Pass through deep casing ribs or spacer sleeves to clamp the housing. The plain shank spans the grip and the integral flange supports the head-side seat.
Heat-recovery equipment
Secure thick brackets and stand-off assemblies around heat-recovery equipment. Extended grip length accommodates the insulation spacer or bracket stack without placing threads through its full depth.
Heated tooling
Clamp thick tooling plates with the head bearing directly on the upper plate. The long shank spans the tooling stack and the flange enlarges the head contact area.
Long-shank flange bolts configurations & dimensions
Flanged head
Use on deep mounting brackets and thick equipment stacks where a wide head seat distributes the clamp load. Check the flange diameter against casting recesses and nearby ribs before specifying a larger head.
Extended grip
The extended plain grip can span spacers and thick components while the thread engages beyond them. Match grip length to the assembled stack so the nut can reach its seat without stopping at the thread runout.
Dimension guide
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Product and thread standards
Raw Material Specifications
Other Materials & Specifications
Finished-Bolt Specifications
Other Materials & Specifications
Threads · Metric
Threads · Inch
Dimension Reference
Production & heat treatment
CNC · Deep-Housing Grips
Supported turning controls the diameter and straightness of the long grip. The flange and threaded end are located around the full housing or spacer stack.
Seat & Thread Finishing
The integral flange is faced square to the grip. End-thread length provides nut travel beyond the plain shank, with the run-out kept clear of the required bearing stack.
Cold Heading / Hot Forging
Smaller long-shank blanks can be cold headed with controlled shank support. A wide flange requires substantial upsetting; larger sections and high-resistance alloys favour hot forging to reduce both forming force and the risk of buckling the blank.
Heat Treatment & Fit
Ageing after solution treatment develops load-carrying strength in Inconel 718. Inconel 625 annealing recovers forming ductility. After treatment, inspection checks long-grip straightness and flange seating together so the bolt enters and seats in a deep housing.
Testing, MTC 3.1 & material traceability
Material certificate
Inconel 625 · historical coil-wire sample
Laboratory report
Inconel 718 · chemistry, tensile & hardness
Identified packing
Heat and batch records linked to the shipment
Additional inspection requirements +
PMI, third-party inspection and witness testing are available by order. Project inspection plans can include UT/PT and heat-treatment records.
Matching products for long-shank flange bolts
Prepare your enquiry
- Material
- Grade / UNS · Condition
- Size
- Diameter · Length / height
- Thread
- Pitch / TPI · Form & class
- Quantity
- Pieces per size