Inconel 718 Stud Bolts

November 15, 2016 by · Leave a Comment 

Inconel 718  Studs Nuts and Bolts 

Tap end stud bolts are used in high pressure situations in the petrochemical industry for OEM and repair situations on flanged to main body connections. The tap end stud bolt has 2 A and 3A fit requirements to achieve complete connection

with one heavy hexagon nut, on the longer 2A fit side. The shorter 3A fit side is inserted into a threaded hole.

Stud Bolts

Stud Bolts

Inconel 718 is typically used in high strength applications where fastener operating temperatures can reach 700 degrees Celsius. Oxidization, thermal cycling and high pressures can create mayhem in bolted joints causing fasteners to loosen and lose grip strength.  The top wellhead and valve OEMs count on High Temperature Bolting both Studs and Bolts for extreme temperatures applications. Sigma Fasteners is a leader in manufacturing Inconel 718 bolting.

The advantages of our Inconel 718 products include

  • Minimize oxidation and corrosion at high temperature.
  • Optional coatings to minimize galling.
  • Available in metric and Inch threads

Sigma can lower your cost for tap end studs with contract pricing or managed inventory.Sigma can supply nuts and bolts or studs.

ASTM Material Selection Chart

Catalog: Tap End Stud

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Flange Bolts

November 13, 2016 by · Leave a Comment 

Custom Flange Screw

Custom Flange bolt

These hexagonal headed or double hex headed bolts are recognizable by the oversized washer face on the bolt head which forms a distinct ridge. This built-in washer under the head of the bolt distributes the fastening force over a large area. A flange bolt is designed to provide the clamping power over a washer and bolt combination. Available in both Hex Head and 12 point double hex head selections. The 12 Point Flange Bolts and Screws are an alternative head design with more torqueing force than standard hex cap screws. The twelve point design permits greater torque to be applied to the screw.

There are many critical design features of a flange bolt or flange screw including the fillet on the underside of the head. The fillet is the transitional curve from the bearing to the body of the fastener. Bearing surface on the flange screw or flange bolt is also key to its design integrating the extra grip strength. In addition, wrenching height on a flange bolt or flange screw is critical dimension that is measured from the top of the head to the top of the flange.

Sizes are available from ½ – 2 inch in a variety of ASTM fastener grade alloys and available to custom manufacture per print specifications.
These can be coated or plated with a variety of finishes. Xylan, PTFE, SermaGard and zinc and bake.

12 Point Flange Screws
12 point Flange Bolts

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Tap End Stud

November 13, 2016 by · Leave a Comment 

Sigma Fasteners manufactures Tap End Stud bolts to your print, Tap End Stud Bolt Standard or AWHEM Standard in all ASTM grades.

Tap End Stud Bolts

Tap End Stud Bolts

Tap end studs have a short thread length on the tap-end side typically threaded tor Class UN-3A fit. This side is screwed into a tapped hole. The nut end  of the stud is threaded with a Class UN-2A fit. Length of the stud is measured form end to end. The tap end has a chamfered point, but the nut end may have either a 30° or 45° chamfered end or round raduised end, at the customers option.The tap end can be measured from the end to last scratch, end of the chamfer to the last full thread or any combination of last scratch, last full thread, end or end of chamfer.

Tap-end studs in standard and exotic metals with multiple finishes:

ASTM B7, B7M, B8, B8M, 660,718, 17-4ph, MP35 and more.

Unfinished, SermaGard, Xylan, PTFE. Moly, zinc or cad plated.

Sigma can lower your cost for tap end studs with contract pricing or managed inventory.

ASTM Material Selection Chart

Catalog: Tap End Stud

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Stud Bolts

May 25, 2016 by · Leave a Comment 

Stud bolts for Pressure-Temperature Piping

Stud Bolts are used in High Pressure & Temperature flanged fittings

REFERENCE
Stud bolts for high pressure & high temperature applications conform to the requirements of ANSI/ASME B16.5, Steel Pipe Flanges and Flanged Fittings.

LENGTH-FIRST TO FIRST
The length of stud bolt, measured parallel to the axis, is the distance from first thread to first thread. First thread is defined as the intersection of the major diameter of the thread with the base of the point. Please see the drawing above-this is confusing to most users!! Stud bolts are normally available from stock in 1/4 inch length increments. Length tolerances, all stud bolt sizes, shall be as tabulated below:

Length, in. Length Tolerance, in.
to 12                           +/-0.062

over 12 to 18          +/-0.125

over 18                      +/-0.250

POINTS
Points shall be flat and chamfered, or sheared at option of the manufacturer. When points are flat and chamfered, the diameter of the flat shall not exceed the minor diameter of the thread, and shall be not less than one or more than two complete threads as measured from the extreme end parallel to the axis.

THREADS
Threads shall be Unified inch coarse thread series (UNC), Class 2A, for all stud bolt sizes 1 in. and smaller, and Unified inch 8 thread series (8 UN), Class 2A, for all stud bolts larger than 1 in., in accordance with ANSI/ASME B1.1. Acceptability of screw threads shall be determined based on ANSI/ASME B1.3.

MATERIAL
Chemical and mechanical requirements shall be specified by the purchaser and shall be in accordance with applicable ASME, ASTM, and ANSI codes and specifications current at the time of ordering.

ASTM Material Selection Chart – Stud bolas are available in ASTM A193 Grade B7, B7M, L7, L7M. As well as 660, 718 Inconel, Mp35N and other high nickel alloys and stainless steels.

DESIGNATION
It is recommended that stud bolts be designated in the following sequence: product name, nominal size, threads per inch, length, material, and protective finish, if required.

Example: ANSI/ASME B16.5 stud bolt,
5/8-11 x 3-1/2, ASTM A193, Grade B7, Zinc & Clear Chromate Plated