Sigma Fasteners

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Custom Bolts

12 point Flange Bolts

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12 point Flange Bolts or 12 point Flange Screw

Description:

These bolts feature a 12 drive surface head for high torque fit. The 12-point design provides the same bearing surface as hex or socket head cap screws of comparable size, and can fit in a confined space using  a standard 12-point socket.

Typical Usage: More than likely for use in a taped hole. 12 point head reduces the chance of tool slippage and the smaller head allows for use in confined areas on a narrow flange.

Other Common Names: Counterbore Screw,  Ferry Cap, Counterbore Screw, 12-point Flange bolt, 12-point flange screw

Catalog: 12 point flange Screws

Inconel 718 Stud Bolts

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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

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    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

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      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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        Custom Bolting to Print

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        Custom Bolt

        Sigma Fasteners specializes in manufacturing custom bolting products for Pressure Control, Petroleum Valve and oilfield equipment manufacturers.

        Need a custom bolt manufactured for your company? Do you need a that non standard fasteners in a hurry? Simga Fasteners specilizes in custom bolting to meet your drawing, rev #, and specifications.  We manufacture custom fasteners in all types of ASTM metals. If you need custom bolts, custom nuts or custom stud bolts, Sigma will deliver them on time. We do carry standard fasteners, but as custom fastener manufacturer, our reputation is built on meeting your demanding fastener needs.

        Have a drawing send it on to us, our experienced sales people will take care of your custom fastener needs. We specialize in large diameter  custom fastener for your products.

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          Coated Bolts

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          Sigma Fasteners manufacturers coated studs to meet major Chemical and Oil Company specifications. Sizes range from 1/2 inch – 3 1/2 and larger.

          Blue Coated Stud Bolts
          Coated Stud Bolts

          Sigma coated bolts have a two-layer structure of special pretreatment polymer film and under-treatment layer. Phosphate Pre-treatment technique insures the physical performance of product without changing and fluropolymer top coating results in a better performance in resisting chemical and seawater corrosion. SermaGard coating is different from PTFE because of their strong corrosion resistant ability. Xylan can be different per customers request to meet various environmental working conditions.

          • Xylan
          • SermaGard
          • PTFE
          • PTFE
          • Moly

          Xyan combined with an advanced treatment technology; the film is thin but is excellent in corrosion resistance which prolongs the lifespan of the product.  Non-stick and low friction properties can make-up the torque coefficient which is easy to install and disassembling. Property of chemical & weather resistance make it suitable to various severe environments.

          Xyaln and SermaGard coatings are the best choice in offshore, oilfield and petrochemical precision equipment against corrosion. Its properties are particularly suitable for surface corrosion prevention of underwater precision equipment including Christmas tree, BOP and pipelines and other parts.

          Xylan coating properties:

          Low friction ( as low as 0.055)

          Remarkable adhesion

          Unusual resistance to wear and abrasion

          Excellent resistance to corrosion

          Resistance to chipping

          Resistance to the elements: weather, sunlight, salt water

          Working temperature range from: -190 to + 260° C

          Available in a wide range of colors