Sigma Fasteners manufactures Tap End Stud bolts to your print, Tap End Stud Bolt Standard or AWHEM Standard in all ASTM grades.
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.
Catalog: Tap End Stud
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.
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.
Catalog: Tap End Stud
Stud bolts for pressure-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 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 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 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.
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 – B7, B7M, L7, L7M, 660, 718 Inconel, Mp35N
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
D Diameter – Nominal Stud Sizes
L Length – Measured end to end
T For 6B & 6BX studded flange connections with R, RX & BX gaskets, thread length maximum on end = 1 diameter + 1.5 pitch + 1/16-0
N Nut end thread length for 6B & 6BX studded flange connections with R, RX & BX gaskets shall be 2-1/2 diameters of full thread minimum.
* Class of Threads – Tap end threads may be furnished in any class thread specified. Nut end threads shall be American Standard Coarse or Fine series, Class 2A or 8 UN.
When ordering, please specify:
Diameter (D); Length (L); End-to-end dimension. (If length is figured first thread to first thread, order
must so specify.)
Tap end thread length (T) and thread series
Nut end thread length (N) and thread series
Double End or Tap End Studs are available in either rolled or cut threads. When the threads are rolled,
the full thread dimensions will increase slightly, and the diameter of the bodies will be undersized to the
pitch diameter of the thread.
Tap End Studs are available in ASTM A193 Grades of material or special materials. Sigma stocks the most
frequently used sizes of tap end studs in ASTM A193 Grade B7. Tap end studs can also be plated or
coated if allowances are made for coating thickness and thread fit.
Prints should be furnished on Double end or Tap End studs whenever possible.
** American Association of Wellhead Manufacturers –
TECHNICAL REPORT TR9501 Revision A
The ASME B16.5 – 1996 Pipe Flanges and Flange Fittings, flange bolt and gasket standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings.
The standard includes flanges with rating class designations 150, 300, 400, 600, 900, 1500, and 2500 in sizes NPS 1/2 through NPS 24, with requirements given in both metric and U.S units. The Standard is limited to flanges and flanged fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints. The standard covers the required number of bolts, diameter of the stud bolts, length of stud bolts and ring size in R, 1RF, RTJ, and RX gaskets.