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captive fastener corporation 201-337-6800 FAX: 201-337-1012 • www.captive-fastener.com
2020
CKF2 and CKFS2 broaching-type fasteners are designed for use on
printed circuit boards and on most brittle or hard materials; such as,
glass laminates, epoxy or resin with paper, nylon, or canvas bases.
They are also used on materials too thin or unsuitable for threading,
such as acrylic and
polycarbonate panels.
Since the aforementioned materials do not flow under
pressure, these fasteners are designed with a knurled shank that
can be pressed into a drilled hole. The shank grips the board with
an interference fit by broaching its way into the panel as it is
squeezed into the holes.
Series Material Finish
CKF2 Carbon Steel Electro tin plating
(Zinc* optional)
CKFS2 300 Series Passivated ASTM A967
Stainless Steel
*See Finish Spec. on Page 6.
Thread: Internal 2B, ANSI B1.1 (6H, ANSI/ASME B1.13M).
Use in: Materials with Rockwell Hardness of B-60 or less.
Dimensions & Specifications
Thread Part Number A B C + .003
Size Carbon Steel Stainless Steel ±.003 ±.005 ±.005 –.000 Min. Min.
#2-56 CKF2256 CKFS2256 .165 .219 .065 .147 .16 .060
#4-40 CKF2440 CKFS2440 .184 .219 .065 .166 .17 .060
#6-32 CKF2632 CKFS2632 .231 .281 .065 .213 .22 .060
#8-32 CKF2832 CKFS2832 .268 .344 .096 .250 .25 .060
#10-24 CKF21024 CKFS21024 .290 .375 .127 .272 .28 .060
#10-32 CKF21032 CKFS21032 .290 .375 .127 .272 .28 .060
Thread Part Number A B C +.08
Size Carbon Steel Stainless Steel ±.08 ±.13 ±.13 –.00 Min. Min.
M2 x 0.4 CKF2M2 CKFS2M2 4.19 5.56 1.5 3.73 4.2 1.53
M2.5 x 0.45 CKF2M2.5 CKFS2M2.5 4.68 5.56 1.5 4.22 4.4 1.53
M3 x 0.5 CKF2M3 CKFS2M3 4.68 5.56 1.5 4.22 4.4 1.53
M4 x 0.7 CKF2M4 CKFS2M4 6.81 8.74 2.0 6.4 6.4 1.53
M5 x 0.8 CKF2M5 CKFS2M5 7.37 9.53 3.0 6.9 7.1 1.53
INCH (in.)
METRIC (mm)
Continued on next page.
Note: CKF2 & CKFS2 broaching fasteners are designed for unplated through-holes. When installed in plated through-holes, a hole tol-
erance of +.005 - .001 in. (+.13 - .03 mm) should be used.
When used in plated through-holes, performance will be reduced and plating may be damaged by knurl.
Broaching-Type Fasteners
Series CKF2 & CKFS2
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www.captive-fastener.com • 201-337-6800 FAX: 201-337-1012 captive fastener corporation
2020
INCH (in.)
METRIC (mm)
Fiberglass .060 in. (1.5 mm)
Thread Size Installation Force (lbs.) Pushout (lbs.) Torque-out (in.-lbs.)
#2-56 400 60 6
#4-40 400 65 15
#6-32 500 80 30
#8-32 700 95 35
#10-24 700 100 40
#10-32 700 100 40
Thread Size Installation Force (kN) Pushout (N) Torque-out (N•m)
M2 2.22 265 .65
M2.5 2.22 285 1.35
M3 2.22 285 1.70
M4 2.90 415 3.95
M5 2.90 435 4.52
Installation & Performance Data
Continued from previous page.
Broaching-Type Fasteners
Series CKF2 & CKFS2
