Looking to build your own spindles/uprights using a bolt-on hub spindle snout? Our spindle snout block is CNC machined in-house from aircraft quality 4130 chromoly that's 1/2" thick. It's 5" x 5" and uses the industry standard Dana 44  bolt pattern that we have doubled up (12 on 4" with 3.375" ID bore). The bolt holes are 3/8-24 and we recommend using mil-spec AS MS21250 series 12pt bolts to attach the snout with. These are machined for a slight press fit and most times requires post machining after welding and/or heat-treatment. Designed for all Camburg 12 bolt spindle snouts among many others We machine all sides and the top and bottom surfaces so everything is parallel. Nothing is laser or waterjet cut like cheaper versions.