How To Order ASTM B994 Fasteners4:59 PM | April 21st, 2018
So you’ve read ASTM B994. You’ve seen the level of testing it requires. You want your facility to be API 20E compliant, and you want to know when your fasteners will seize. You have a critical bolting need, and you want the solution that will go the distance. You are ready to take the plunge into ASTM B994 compliant bolting.
But how do you know the company you’re going with manufactures a compliant fastener? You know there are different testing classes defined within the specification and different service conditions to meet different demands, but how can you be certain you’re getting the fasteners you want? How do you know which fastener is right for your work?
What do you need?
Procurement professionals know that specificity is the key to getting what you want. In the realm of fasteners, this means knowing where the bolt will go and the role it will perform. Aside from the basics of length and diameter, also specify the type of steel you want. For many critical bolting operations, facilities look for ASTM A193 compliant B7 carbon steel studs with two ASTM A194 compliant 2H nuts. If you have a different need, though, the standards defined by ASTM B994 can be effectively applied for coating any type of carbon steel stud or nut.
ASTM B994 outlines four service conditions that relate to coating thickness, measured in micrometers (μm). Depending on your requirements, these service conditions will determine the optimal Nickel-Cobalt plating. ASTM B994 defines 5μm through 25μm as the lowest allowable thickness for coating.
To withstand corrosive offshore environments and comply with API 20E specifications that prohibit oversizing nuts or undersizing studs, Nickel-Cobalt plating must have a minimum thickness of 18μm. When ordering API 20E compliant fasteners for critical bolting operations, make sure you order ASTM B994 fasteners following SC18
It’s always important to have class, and ASTM B994 is no exception. ASTM B994’s four testing classes describe the level of testing that a fastener undergoes, during and after production. Seven different testing methods are outlined in ASTM B994, and each testing class requires at least one of these tests to be performed at regular intervals ranging from 30-120 days. The most rigorous testing class, which performs all seven tests, is Class 1. ASTM B994 Class 1 is the only testing class that requires all evaluations be performed on a coated fastener and under tension, providing the most accurate reflection of real world service conditions. Class 1 is also the only testing class that performs the crucial galling test, or the Fastener End of Life Test (FELT). The galling test allows the customer to know the predicted lifespan of a fastener in service.
How to Order
To make sure their company is working with the most effective, thoroughly evaluated fasteners on the market, procurement professionals must order ASTM B994 SC18 Class 1 compliant fasteners. These specifications, when applied along with API 20E standards, make sure fasteners offer the highest caliber protection from the most destructive environments during critical bolting operations.
When ordering your fasteners, put safety first. Make sure every fastener complies with ASTM B994 SC18 Class 1.
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