Gauge Pin This item was sourced on www.MFG.com as one of the items in an RFQ in CANADA for Surface Grinding Production of a gauge pin. Made from No. 23065A504 2" long McMaster Carr Ready Ground 2" long Gauge Pins, which buyer will supply. Profile to be ground on the end. Closest Grinding tolerance is +0.000/-0.005". Gauge Pins come already ground to OD tolerance required and prehardened - only the end profile needs to be ground. Dimensional Report required. See attachments for details. Part Part Number: QN7014_8576411 Material: Alloy Steel Material Grade: Make from Gauge Pin www.mcmastercarr.com Part No. 23065A504 Technical Specifications Category:Surface Grinding Dimensions50.8 x 4.13512 inch Tolerance:0.127Annual Usage:400.0 The following suppliers (machine shops, fabricators, casters, molders, 3D printing, CNC machining, etc.) provide manufacturing services and are members of the MFG.com community. For more information visit http://www.mfg.com. MFG.com performs a 5-point inspection on all engineered parts and RFQs to ensure quality and enhance your quoting experience Surface Grinding: Surface grinding, commonly called flat grinding, is the process of removing extremely small amounts of material from a flat surface of a part, be it top, bottom or sides. Surface grinding is done primarily to produce fine or smooth finish surfaces. Often it is a pre-finishing treatment done to better accept coating or painting. Surface grinding is also done to achieve tight tolerances for flat, parallel or square dimensions.