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Manufacture and Distribute Fasteners for Energy

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Sigma Fasteners

Sigma Fasteners Announces the Retirement of Two Legends

By Sigma Fasteners on July 1, 2016

Houston, Texas, July 1, 2016 – Sigma Fasteners, Inc., a manufacturer, and distributor of engineered and high-pressure bolting products, announced today that founding President, Judy Jandl and Vice President, Jerry Jandl are retiring. Judy has been in the fastener industry since starting at Lone Star Screw Company in the late sixties – a company she later went on to run and own. Judy has long been considered a champion for women in business. Winning recognition from the Houston Business Journal in 1995 as one of the Top 50 Woman Owned Businesses in Houston. Jerry Jandl is also a longtime luminary in the fastener industry starting Jandl Manufacturing, later a Lone Star Screw Company subsidiary, in his garage. The Jandl’s teamwork spanning the decades formed a driving force in the specialty high pressure bolting and coating industries.

Over the last several years, Judy has been transitioning the day to day leadership to Cris Baker, Sigma Fastener’s new president. With over 25 years of fastener experience, Baker steps to the plate with a talented group of industry veterans, recently earning the API 20E & API Q1 certifications, ready to carry Sigma Fasteners into the future. Baker stated, “I’ve learned so much from both of them through the years and I’ve always tried to live up to their standards – building a great company through great people, great products, and a strong commitment to quality innovations – now tasked with holding our team to those high principles, I embrace the opportunity.”

About Sigma Fasteners Headquartered in Houston, Texas, Sigma is one of the most trusted fastener and specialty bolt suppliers in the world, committed to first-class quality products and service. Sigma Fasteners, Inc. relies on investing in its people, leading technology and state-of-the-art manufacturing facilities to produce the engineered products to custom specifications which serve petroleum refining, petrochemical, power generation, and pulp and paper industries. For additional information, visit www.sigmafasteners.com or call +1 (281) 214-8800.

Fastener Torque

By Sigma Fasteners on June 17, 2016

TORQUE Book for Fasteners

Product Details
Author: IFI
Date Published: April 2013
Media Type: Books
Product Type: Reference Book

This book is the industry standard resource that combines all of the engineering data needed to calculate the tightening torque for all types of inch and metric fasteners in a single volume.

The book starts out by explaining the classic torque calculation formula. It then provides all of the engineering data tables containing the variables related to K factors, thread sizes, and fastener yield strengths needed for calculating torque.

The book includes sections how to prevent stainless steel galling, values for tightening tapping screws, values for tightening set screws, an explanation on how to perform tests on completed assemblies to determine original torque values used to tighten the bolts.

This book can answer most all the questions and is invaluable information on fastener tightening.

 

Get the App:

iPhone – Torque App for Fasteners
Android – Torque App for Fasteners

This application for iPhone and android smartphones pulls together all of the engineering data needed to calculate a tightening torque for all types of inch and metric fasteners in an easy to use app. It covers inch sizes from #0 through 4 inches and metric fastener sizes M1.6 through M64, sixty-one (61) inch fastener material grades, fifty-five (55) metric fastener property classes, and eighty-two (82) fastener finishes. Just select inch/metric, fastener size, fastener strength, and fastener finish, and click CALCULATE. No more digging through books, using a calculator, or worse, guessing at recommended fastener tightening values.

Stud Bolts

By Sigma Fasteners on May 25, 2016

Stud bolts for Pressure-Temperature Piping
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

Sigma Fasteners, Inc Earns American Petroleum Institute 20E Monogram

By Sigma Fasteners on May 19, 2016

Sigma Fasteners, Inc Earns American Petroleum Institute 20E Monogram
Houston, Texas, May 19, 2016 – Sigma Fasteners, Inc., a manufacturer, and distributor of engineered and high-pressure bolting products, announced today that it received an American Petroleum Institute (API) 20E Monogram License to manufacture API 20E bolting at its original facility in Houston, Texas. Sigma also earned API Spec Q1, 9th edition Certification for the Manufacture and Distribution of Fasteners, Coating, and Plating of Customer Parts for the Oil and Gas Industries. Sigma is currently just the fourteenth company in the world to have received the API 20E Monogram for Alloy and Carbon Steel Bolting used in critical surface and subsea applications.

“The API 20E Monogram and Spec Q1 is a world class mark of distinction that demonstrates Sigma meets the first-class standards set out by API,” said Sigma Fasteners Executive Vice President Cris Baker. “Pursuing and attaining these standards inspire our employees to improve every aspect of our processes and open up significant opportunities for our company to better serve all customers in these challenging times. I am proud of Sigma’s ability to pull together and reach for higher goals.”

About Sigma Fasteners
Headquartered in Houston, Texas, Sigma is one of the most trusted fastener and specialty bolt suppliers in the world. Sigma is committed to first-class quality products and service. It has manufacturing, sales and service facilities located in Houston servicing customers around the world. Sigma Fasteners has developed a strategy for innovation and leadership in bolting products with the widest selection of bolting materials ready for prompt delivery. Sigma relies on investing in its people, leading technology and state-of-the-art manufacturing facilities to produce the engineered products to custom specifications which serve petroleum refining, petrochemical, power generation, and pulp and paper industries. For additional information, visit www.sigmafasteners.com or call +1 (281) 214-8800.

CONTACT:
Pat Garrett
Sigma Fasteners, Inc. Director of Sales
(281) 214-8800

Download the Press Release

Fasteners

By Sigma Fasteners on April 21, 2016

Fasteners

Sigma Fasteners manufactures and distributes a wide range of fasteners and bolting products – Fasteners for industry ranging from ½ through 4” and larger – In metric sizes M3 – M48 and larger. While Sigma is a full line distributor for all fastener products we specialize in custom bolts and custom bolting products for energy. Whether in emerging energy fields such as wind turbine bolting or legacy energy fields needing NACE certified MRO175 Sigma has the expertise to supply or custom manufacture all your bolting requirements. Our people have many years of experience in handling the most demanding expectations including the rigors North Slope of Alaska, to the regulatory hurdles of the South Texas Nuclear Project. Sigma Fasteners is ISO 9001:2001 certified and daily our associates deal with custom manufacturing many of the largest pressure and flow control equipment manufactures in the world. Sigma knows how to meet or exceed expectations of the most demanding fastener specifications in the industry. In addition, to distributing and manufacturing custom fasteners, Sigma also has fastener coating and fasteners plating capabilities that allow us control over your demanding needs.  Let Sigma be the answer to all your bolting needs.

The links below are from our standard fasteners catalog and includes items in stock and special order.

Nuts Bolts and Screws

Screws
Round Head Screws
Various Head Styles Machine Scerws
Tapping Screws (Approx. Hole Sizes)
Thumb and Wing Screws

B7 Studs and Nuts
Stud Bolts for Pressure-Temperature Piping
General Purpose End-to-End Studs
Tap End Stud Bolts
Double End Stud Bolts

Bolts
Hex Cap Screws (Finished Hex Bolts)
Wrench Openings for Square and Hex Bolts and Screws
Heavy Hex Bolts
Heavy Hex Structural Bolts
High-Strength Structural Bolting
Carriage Bolts and Lag Bolts
Square Bolts
Step Bolts and Countersunk Head Elevator Bolts

Nuts
Finished and Heavy Hex Nuts
Hexagon Machine Screw Nuts
Type A Forged Wing Nuts
Hex Slotted Nuts
Hex and Heavy Hex Jam Nuts
Hex Castle Nuts
Large Diameter Hexagon Head Cap Nuts

Round Spanner Nuts
Heavy Hex Nuts with Tommy Bar Holes

Sockets & Pins

Socket Head Cap Screws
Button Head and Flat Head Socket Cap Screws
Socket Set Screws
Hexagon Keys and Bits
Socket Head Shoulder Screws, Dowel Pins, and Slotted Set Screws
Square Head Set Screws and Socket Pipe Plugs
Physical Properties of Sockets
Point Terminology
Flange 12-Point Screws
Taper Pins
Threaded Taper Pins
Dowel Pins
Roll Pins
Cotter Pins

Washers
USS Wrought Washers
Stainless Steel Washers
S.A.E. Washers
Brass Washers
Beveled Washers
Spring Lock Washers
Tooth Lock Washers
Belleville Washers

Anchors
Wedge Anchors
Drop-In Anchors
Single Expansion Anchors
Machine Screw Anchors
Lag Shields
Lead Wood Screw Anchors
Hammer drive Anchors
Hollow Wall Anchors
Toggle Bolts
Toggle Wings and Nylon Nail Anchors
Plastic Anchors and Toggles

Locknuts
ESNA® Light Hex Nuts
FLEXLOC® Self-Locking Nuts
Prevailing-Torque Type Steel Hex and Hex Flange Nuts
ANCO Self-Locking Nuts

Self-Sealing Screws
Plated Carbon Steel
Stainless Steel
Plated Steel Self-Drilling

Self-Locking Fasteners

U-Bolts and Eye Bolts
Anchor Bolts & Bent Bolts
A-Bolts, Standard
U-Bolts, Long Tangent
Eyebolts-Regular Pattern
Eyebolts-Shoulder Pattern
Rod End Eyebolt Blanks

Metric Fasteners
Metric Hex, Head Cap Screws
Weights of Metric Hex Head Cap Screws
Metric Socket Cap Screws & Metric Flat Head Socket Caps
Metric Socket Set Screw & Metric Button Socket Caps
Metric Hex Nuts
Metric Flatwashers
Metric Internal & External Tooth Washers
Metric Lockwashers

Custom Bolting to Print

By Sigma Fasteners on April 19, 2016

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.

ASTM Material Selection Chart

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