Tool steel (English Wikipedia)

AISI A2, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A3, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A4, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A6, Efunda, archived from the original on 2011-08-19, retrieved 2010-12-25.
AISI A7, Efunda, archived from the original on 2011-09-16, retrieved 2010-12-25.
AISI A8, Efunda, archived from the original on 2011-09-09, retrieved 2010-12-25.
AISI A9, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A10, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.

hudsontoolsteel.com (Global: low place; English: low place)

Palmer 1937, p. 10. Palmer, Frank R. (1937). Tool Steel Simplified: A handbook of modern practice for the man who makes tools (1st ed.). Reading, Pennsylvania: The Carpenter Steel Company. p. 10. LCCN 37006807. OCLC 3746717.
Palmer 1937, pp. 43–45. Palmer, Frank R. (1937). Tool Steel Simplified: A handbook of modern practice for the man who makes tools (1st ed.). Reading, Pennsylvania: The Carpenter Steel Company. p. 10. LCCN 37006807. OCLC 3746717.

"Carpenter O6 Graphitic Tool Steel (AISI O6)". MatWeb. Retrieved 2017-11-20.{{cite web}}: CS1 maint: deprecated archival service (link)
"Crucible Steel KETOS® Tool Steel, AISI O1". MatWeb. Retrieved 2017-11-20.{{cite web}}: CS1 maint: deprecated archival service (link)
"AISI Type O2 Oil-hardening Tool Steel, oil quenched at 800°C, tempered at 260°C". MatWeb. Retrieved 2017-11-20.{{cite web}}: CS1 maint: deprecated archival service (link)
"AISI Type O7 Tool Steel". MatWeb. Retrieved 2017-11-20.{{cite web}}: CS1 maint: deprecated archival service (link)

"UDDEHOLM ARNE" (PDF). Archived from the original (PDF) on 2021-03-19.
"1.2842 / 90MnCrV8 - Tool Steel". steel-bar.com. 16 July 2022. Archived from the original on September 4, 2022.
AISI A2, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A3, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A4, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A6, Efunda, archived from the original on 2011-08-19, retrieved 2010-12-25.
AISI A7, Efunda, archived from the original on 2011-09-16, retrieved 2010-12-25.
AISI A8, Efunda, archived from the original on 2011-09-09, retrieved 2010-12-25.
AISI A9, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
AISI A10, Efunda, archived from the original on 2012-04-02, retrieved 2010-12-25.
A-10 Tool Steel Material Information, archived from the original on 2004-04-04, retrieved 2010-12-25.

A-10 Tool Steel Material Information, archived from the original on 2004-04-04, retrieved 2010-12-25.

Palmer 1937, p. 10. Palmer, Frank R. (1937). Tool Steel Simplified: A handbook of modern practice for the man who makes tools (1st ed.). Reading, Pennsylvania: The Carpenter Steel Company. p. 10. LCCN 37006807. OCLC 3746717.
Palmer 1937, pp. 43–45. Palmer, Frank R. (1937). Tool Steel Simplified: A handbook of modern practice for the man who makes tools (1st ed.). Reading, Pennsylvania: The Carpenter Steel Company. p. 10. LCCN 37006807. OCLC 3746717.