This National Acme replacement cotter pin part number 51663 is used in Universal Threading Drive Shaft Assembly AM-413702.  View any of the following layout assembly drawings of the complete multispindle attachment for reference. This replacement part may be used in attachment assemblies that fit numerous size Acme Gridley multi spindle screw machines and/or positions.
Acme Gridley 1-1/4" RB-8 Universal Threading Attachment - 3rd Position
Acme Gridley 1-1/4" RB-8 Universal Threading Attachment - 4th Position
Acme Gridley 1-1/4" RB-8 Universal Threading Attachment - 5th Position
Acme Gridley 1-1/4" RB-8 Universal Threading Attachment - 6th Position
Acme Gridley 1-1/4" RB-8 Universal Threading Attachment - 7th Position
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