About

Sigma Fasteners provides quality bolting and coating for the energy industry. Sigma is a manufacturer and distributor of ASTM bolting specified by the American Petroleum Institute. Sigma Distributes standard bolting and manufactures custom bolts to customer specifications and per print following careful details of the latest revisions. We are ISO 9001 2000 certified and are on the approved vendor list of major wellhead manufacturers, energy and petrochemical companies worldwide. Our coatings applications include: Whitford Xylan™ SermaGard® Ceramic Metallic Everlube Product MacDermid Chloride... 

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Sigma Fasteners

Custom Bolts

Duplex Stainless Bolts

Duplex Stainless Bolts

Duplex Stainless Bolts Duplex stainless has twice the yield strength of conventional austenitic stainless steels. Duplex stainless... 

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High Strength Super Alloy Bolts

High Strength Super Alloy Bolts

17-4 custom bolts High Strength Super Alloy Bolts 17-4 is a precipitation hardening Stainless steel alloy. This chromium-nickel grade... 

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B7M Bolts

B7M Bolts

ASTM A193 Grade B7M Bolt B7M Studs Bolt Description: B7M bolts for High Temperature and/or High Pressure service are modified in our... 

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Xylan Coated Bolts

Xylan Coated Bolts

Coated Stud Bolts Xylan Coated Stud Bolts Xylan 1010, 1070, 1014, 1052 and now 1424 have been used as bolt coatings for almost a quarter... 

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