Fastener Reference Guides

Bolt Head MarkingsA convenient chart to help you identify the material grade of an inch or metric dimension bolt.
Conversion Chart, DIN and ISO EquivalenciesCross reference DIN specifications to the equivalent ISO specifications.
Conversion Chart, Metric to Inch DimensionsCross reference metric dimensions to common fractional and dimensional inch equivalencies.
Fastener Coatings and Surface FinishesAll about coatings and surface treatments that are typically used on industrial fasteners.
Head and Drive Styles for FastenersDetailed descriptions of the most comment fastener head and drive styles.
How to Measure the Length of a FastenerWhen specifying a fastener length, do you measure from the top of the head, or from under the head? This chart will let you know.
Machine Screws, Head SpecificationsHead and drive dimensions for 100 degree flat countersunk head and round washer head machine screws.
Machine Screws, Styles and UsesA guide to machine screws. All about different head styles and drive types.
Machine Screws, Thread and PitchDetails about the coarse and fine thread pitches for inch dimension machine screws.
Rivets, Part Number Cross Reference ChartCross reference the industry part numbers from key rivet brands to find the Aspen Fasteners rivets you need.
Sheet Metal Tapping Screws, Drill SpecificationsInformation about material plate thickness and pilot hole sizes to use for different types of sheet metal self tapping screws.
Sheet Metal Tapping Screws, Type ATechnical specifications for Type "A" sheet metal self tapping screw points.
Sheet Metal Tapping Screws, Type BTechnical specifications for Type "B" sheet metal self tapping screw points.
Square Recess Drive SpecificationsDetailed specifications about square recess drives, also known as Robertson drives.
Stainless Steel SpecificationsAll about stainless steels used in fastener production including chemical, physical and mechanical properties.
Thread Cutting Screws SpecificationsDetailed information about the different types of thread cutting screws threads and points.
Thread Pitch Chart, Inch and MetricLook up the standard coarse thread and fine thread pitches used on inch and metric dimension industrial fasteners.
Thread Rolling Screws for MetalsThread specifications and information about materials and pilot holes.
Thread Rolling Screws for PlasticsThread design details, materials and what pilot holes to drill.

Our catalog is always growing, so if you need help finding what you need, we are here for you!

- The Aspen Fasteners Team