40S5-12, 1/4 Turnlock Fastener Stud Assembly, 5 PieceCondition:* New Surplus Stock, No OEM Packaging. As Pictured.Additional Notes:* Diameter: Between 0.377″ and 0.384″* Distance From Engaging Member To Largest Bearing Surface Of Head: Between 0.713″ and 0.723″* Drive Type: Cross recess* End Application: Ch-53a/d/e* Eyelet Length: 0.502″* Eyelet Outside Diameter: Between 0.341″ and 0.348″* Material: Steel comp 302 pin* Material: Stainless steel stud* Material Accommodated Thickness: Between 0.261″ and 0.410″* Material Specification: 300 series iaw astm a276 or astm a580 assn standard single material response or ams-qq-s-763 federal specification single material response stud* Material Specification: Astm a313 assn standard single material response or ams-qq-s-763 federal specification single material response pin* Part Name Assigned By Controlling Agency: Stud assembly flat head cross recess* Special Features: Astm a582 or astm a666 astm a240 spacer material is 300 series cres per astm a666 or astm a240;spring material is 302 cres per astm a313 or ams-qq-s-763;cup material is 300 series cres per astm a167* Stud Assembly Style: Stud assembly* Stud Head Height: 0.102″* Surface Treatment: Passivate* Surface Treatment Specification: Astm a967 assn standard single treatment response or ams2700 national std/spec single treatment response* Turnlock Stud Head Style: Stud headUNK40S5-12