Flare Mounted Threaded Standoffs Series CKFB3 Series CKFB3 flare mounted threaded standoffs provide a flared shank for stronger holding power and are used for spacing or stacking PC boards. .04 in. (1.0 mm) .09 in. (2.29 mm) MAX. T L Finish Brass CDA-360 CKFB3 B C A H Material Electro Tin Plating ASTM B545 Class B (Zinc* Optional) Part Number Structure: *See Finish Spec. on Page 6. CKFB3 440-2 Length Code Thread Code Series Thread: Internal 2B ANSI B1.1 (6H, ANSI/ASME B1.13M). Use in: Materials with Rockwell Hardness of B-65 or less. INCH (in.) Dimensions & Specifications L Thread Part Length .005 in. Size Number .0625 .125 .187 .250 .312 .375 .500 .625 .750 #4-40 CKFB3440 -2 -4 -6 -8 -10 -12 -16 -20 #6-32 CKFB3632 -2 -4 -6 -8 -10 -12 -16 -20* -24* "T" Minimum Full .375 .015 thread length A C B H +.005 .003 Max. .003 .005 -.001 .179 .165 .122 .219 .166 .226 .212 .171 .281 .213 Min. Min. .17 .050 .22 .065 METRIC (mm) Dimensions & Specifications Thread Size M3x0.5 M4x0.7 Part Number 2 CKFB3M3 -2 CKFB3M4 -2 "T" Minimum thread length 3 -3 -3 4 -4 -4 L Length .13 mm 6 8 10 -6 -8 -10 -6 -8 -10 Full 12 -12 -12 14 -14 -14 9.5 .4 16 -16 -16 A .08 4.55 6.68 C Max. 4.20 6.33 B .08 3.23 5.23 H .13 5.56 8.74 +.13 -.03 4.22 6.40 Min. 4.33 6.36 Min. 1.27 1.65 Installation & Performance Data METRIC (mm) INCH (in.) Fiberglass .060 in. (1.5 mm) 58 Thread Size #4-40 #6-32 Thread Size M3 M4 Installation Force (lbs.) 1000 1500 Installation Force (kN) 4.4 6.0 Pushout (lbs.) 140 170 Pushout (N) 560 680 Torque-out (in.-lbs.) 18 28 Torque-out (N*m) 2.02 3.20 captive fastener corporation 201-337-6800 FAX: 201-337-1012 * www.captive-fastener.com 2014