In 1995, Patrick Ottaway wrote a paper based on his PhD thesis for York University entitled Anglo Saxon Ironwork. The paper is available in PDF format on the PJO Archaeology website.
From the website:
The paper can be downloaded in four parts. Part 1 covers sources and properties of iron, the smithy and the smiths' tools, craftworkers' tools, and agricultural and fishing tools. Part 2 covers knives, other tools and implelements, structural ironwork and fittings, and locks and keys. Part 3 covers dress fittings and riding equipment, horse equipment and arrowheads, and has a general conclusion. The notes and references for Parts 1-3 are in Part 4.