{"product_id":"ms21250h07070","title":"MS21250H07070 12-Point Flange Bolt — 180 KSI, .4375-20, 4.375\" Grip (Drilled Head)","description":"\u003cp\u003eThe MS21250H07070 is a high-strength 12-point external-wrenching flange bolt designed for tension-critical aerospace structures — airframe joints, engine mounts, rotor and control-system connections where 180 ksi tensile performance and positive wrenching engagement are required. Its flanged 12-point head delivers high clamp force in confined spaces where a standard hex cannot develop sufficient torque. The drilled head accepts safety wire for positive locking in vibration-critical installations.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eMS21250H07070 (supersedes to NASM21250H07070)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread\u003c\/td\u003e\n\u003ctd\u003e.4375-20 UNJF-3A per MIL-S-8879\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrip Length\u003c\/td\u003e\n\u003ctd\u003e4.375 in (±.010)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e5.116 in (±.015)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Diameter (A)\u003c\/td\u003e\n\u003ctd\u003e0.740–0.750 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShank Diameter (B)\u003c\/td\u003e\n\u003ctd\u003e0.4360–0.4370 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange Diameter (W)\u003c\/td\u003e\n\u003ctd\u003e0.5000 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Height (H)\u003c\/td\u003e\n\u003ctd\u003e0.435 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Length (T)\u003c\/td\u003e\n\u003ctd\u003e0.721 in ref\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUltimate Tensile Strength\u003c\/td\u003e\n\u003ctd\u003e180,000–200,000 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDouble Shear Strength\u003c\/td\u003e\n\u003ctd\u003e32,500 lbf\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile Strength (min)\u003c\/td\u003e\n\u003ctd\u003e21,200 lbf\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAISI 4340 alloy steel (4140 \/ 8740 \/ 6150 alternates)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003eHRC 39–43\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eCadmium plate + chromate per QQ-P-416 Type II Class 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Marking\u003c\/td\u003e\n\u003ctd\u003eMS21250 + manufacturer's code\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcurement Spec\u003c\/td\u003e\n\u003ctd\u003eMIL-B-8831\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHead Drilling\u003c\/td\u003e\n\u003ctd\u003e4 holes × 0.037 in (±.005), equally spaced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch3\u003eDatasheet \u0026amp; Compliance\u003c\/h3\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFSC\u003c\/td\u003e\n\u003ctd\u003e5306 (Bolts)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNSN\u003c\/td\u003e\n\u003ctd\u003e5306-01-200-1408\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eECCN\u003c\/td\u003e\n\u003ctd\u003eEAR99 (no license required for standard export)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSchedule B\u003c\/td\u003e\n\u003ctd\u003e7318.15.8085\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e≈ 0.254 lb (115 g) per piece\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMOQ\u003c\/td\u003e\n\u003ctd\u003eNone — order from 1 pc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003eManufacturer certifications (CoC + mill report + dimensional report) ship FREE with every lot.\u003c\/p\u003e\u003ch3\u003eAlternatives \u0026amp; Related Parts\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eUndrilled variant: \u003cstrong\u003eMS21250-07070\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSame diameter group, other grip lengths: 0.250\"–5.000\" grips available\u003c\/li\u003e\n\u003cli\u003eCurrent standard: \u003cstrong\u003eNASM21250\u003c\/strong\u003e (military adoption of MS21250; fully interchangeable)\u003c\/li\u003e\n\u003cli\u003eNot for new design after 4 Dec 1980 per the standard — replacement-in-kind only; we support all legacy fleet demand.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eLead Time\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eMade to order — ships in 4 weeks.\u003c\/strong\u003e Raw material (AISI 4340 bar) is stocked at our Kunshan plant; every lot is machined, heat-treated, plated and inspected to order. No stockouts, no minimums on standard sizes.\u003c\/p\u003e\u003ch3\u003eQuality Documentation\u003c\/h3\u003e\u003cp\u003eEvery lot ships with: Certificate of Conformance (CoC) · mill material report (heat-lot traceable) · full dimensional inspection report · First Article Inspection (FAI) on request. 100% thread and plating verification per MIL-B-8831.\u003c\/p\u003e\u003ch3\u003eShipping \u0026amp; Duties — DDP\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eFree express shipping on orders of $300 or more\u003c\/strong\u003e; a flat $49.99 courier charge applies to smaller orders (FedEx\/DHL, 3–7 days worldwide after the 4-week production lead time). US import duty and Section 301 tariffs are included in our prices — delivered duty paid, no customs surprises. Larger programs (\u0026gt;500 pcs or \u0026gt;$5,000): request a quote for FOB terms and volume pricing.\u003c\/p\u003e","brand":"FULLERKREG","offers":[{"title":"EA","offer_id":48633486868678,"sku":"MS21250H07070","price":34.55,"currency_code":"USD","in_stock":true}],"url":"https:\/\/fullerkregaerospace.com\/products\/ms21250h07070","provider":"Fullerkregaerospace","version":"1.0","type":"link"}