Captive Screws

CNA – Self-Clinching

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3D CAD Models available. Contact a PENCOM Account Representative to request.

Part Description Example

  • CNASeries
  • 632Thread
    Code
  • .060Screw
    Length
    Code
  • PHDrive
    Code
  • KNKnurled
    Cap*
  • SSMaterial
    Code
  • PFinish
    Code

*Omit KN for smooth cap

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*Contact a PENCOM Account Representative for the part number based on the description.

cna-featured

Features

  • Narrow design for limited space applications.
  • New contemporary appearance.
  • Provide a simple and permanent installation in aluminum and carbon steel sheets.
  • Choice of RoHS-compliant materials and finishes.
Drive Description
PH Cross-Recess
SL Slotted
TX Six-Lobe Recess

General

Thread Thread
Code
Screw
Length
Code
Sheet A
(Shank)
Max.
C
Max.
E
±.010
P1
Ref.
Minimum
Thickness
Hole
Size
+.003
-.000
Minimum
Distance
Hole Center
to Edge
4-40 440 .060 .060 .265 .25 .060 .264 .312 .060
.185 .185
6-32 632 .060 .060 .281 .28 .060 .280 .344 .060
.185 .185
.310 .310
8-32 832 .060 .060 .312 .31 .060 .311 .375 .060
.185 .185
.310 .310
10-32 1032 .060 .060 .344 .34 .060 .343 .406 .060
.185 .185
.310 .310
1/4-20 2520 .060 .060 .413 .38 .060 .412 .468 .060
.185 .185
.310 .310
Thread Thread
Code
Screw
Length
Code
P2
±.016
P3
±.025
H1
Max.
H2
Ref.
Drive Size
Cross-
Recess
Six-Lobe Slot
4-40 440 .060 .250 .000 .370 .540 #1 T-10 .040W
.040D
.185 .375 .125
6-32 632 .060 .250 .000 .380 .540 #2 T-15 .051W
.047D
.185 .375 .125
.310 .500 .250
8-32 832 .060 .312 .000 .480 .705 #2 T-20 .055W
.055D
.185 .437 .125
.310 .562 .250
10-32 1032 .060 .312 .000 .490 .705 #2 T-25 .059W
.055D
.185 .437 .125
.310 .562 .250
1/4-20 2520 .060 .375 .000 .620 .905 #3 T-25 .071W
.059D
.185 .500 .125
.310 .625 .250

Material & Finish

Material
Code
Material Description Finish
Code
Finish Description For Use in
Sheet Hardness
Retainer Screw Spring Retainer Screw Spring HRB 70
Max.
HRB 60
Max.
SS 300-Series
Stainless Steel
400-Series
Heat Treated
Stainless Steel
300-Series
Stainless Steel
BLK-NIT Black
Nitride
Black
Nitride
Passivated
and/or
Tested per
ASTM
A 967
SS 300-Series
Stainless Steel
400-Series
Heat Treated
Stainless Steel
300-Series
Stainless Steel
P Passivated
and/or
Tested per
ASTM
A 967
Passivated
and/or
Tested per
ASTM
A 967
Passivated
and/or
Tested per
ASTM
A 967
STL Carbon Steel Heat Treated
Carbon Steel
300-Series
Stainless Steel
NI Bright Nickel
per ASTM B
689
Type II,
Class 5
Bright Nickel
per ASTM B
689
Type II,
Class 5
Passivated
and/or
Tested per
ASTM
A 967

Installation

  1. Prepare correct sized mounting hole in sheet. Do not deburr hole edges.
  2. Insert fastener in recessed anvil, locate sheet hole over captive screw shank with hole punch side of sheet toward the retainer and center punch over screw thread.
  3. Squeeze the fastener between concentric and parallel anvil and punch surfaces. Use only enough pressure to seat the retainer shoulder flush with the sheet. Anvil and punch should be made from hardened tool steel or may be ordered using the PENCOM part numbers shown in the tables below.

Anvil and Punch Dimensions

Thread
Code
Anvil Punch
A
±.002
C
±.002
Part
Number
D
±.002
Part
Number
440 .345 .358 TL1314 .190 TL1303
632 .345 .390 TL1315 .214 TL1304
832 .435 .421 TL1316 .243 TL1305
1032 .435 .452 TL1317 .267 TL1306
2520 .555 .514 TL1318 .329 TL1307

Performance

Thread
Code
Material
Code
Test Sheet Material
Aluminum Cold-rolled Steel
Installation
(lbs)
Retainer
Push-out
(lbs)
Installation
(lbs)
Retainer
Push-out
(lbs)
440 SS 2400 240 3000 300
STL 255
632 SS 2700 275 3500 350
STL 295
832 SS 2900 300 3800 400
STL 340
1032 SS 3000 400 4000 500
STL 420
2520 SS 3500 400 5000 600
STL 510
Performance data represents the average destructive result when all installation specifications are strictly followed. Variations in panel hole size, thickness, material, and installation methods will affect the loads. PENCOM strongly encourages testing in the application.

General

Thread Thread
Code
Screw
Length
Code
Sheet A
(Shank)
Max.
C
Max.
E
±0.25
P1
Ref.
Minimum
Thickness
Hole
Size
+0.08
-0.00
Minimum
Distance
Hole Center
to Edge
M3 x 0.5 M3 1.53 1.53 6.73 6.35 1.53 6.71 7.92 1.53
4.71 4.71
M3.5 x 0.6 M3.5 1.53 1.53 7.14 7.11 1.53 7.11 8.74 1.53
4.71 4.71
7.88 7.88
M4 x 0.7 M4 1.53 1.53 7.92 7.87 1.53 7.90 9.53 1.53
4.71 4.71
7.88 7.88
M5 x 0.8 M5 1.53 1.53 8.74 8.63 1.53 8.72 10.31 1.53
4.71 4.71
7.88 7.88
M6 x 1.0 M6 1.53 1.53 10.49 9.65 1.53 10.47 11.89 1.53
4.71 4.71
7.88 7.88
Thread Thread
Code
Screw
Length
Code
P2
±0.40
P3
±0.64
H1
Max.
H2
Ref.
Drive Size
Cross-
Recess
Six-Lobe Slot
M3 x 0.5 M3 1.53 6.35 0.00 9.40 13.72 #1 T–10 1.02W
1.02D
4.71 9.53 3.18
M3.5 x 0.6 M3.5 1.53 6.35 0.00 9.65 13.72 #2 T–15 1.30W
1.19D
4.71 9.53 3.18
7.88 12.70 6.35
M4 x 0.7 M4 1.53 7.92 0.00 12.19 17.91 #2 T–20 1.40W
1.40D
4.71 11.10 3.18
7.88 14.27 6.35
M5 x 0.8 M5 1.53 7.92 0.00 12.45 17.91 #2 T–25 1.50W
1.40D
4.71 11.10 3.18
7.88 14.27 6.35
M6 x 1.0 M6 1.53 9.53 0.00 15.75 22.99 #3 T–25 1.80W
1.50D
4.71 12.70 3.18
7.88 15.88 6.35

Material & Finish

Material
Code
Material Description Finish
Code
Finish Description For Use in
Sheet Hardness
Retainer Screw Spring Retainer Screw Spring HRB 70
Max.
HRB 60
Max.
SS 300-Series
Stainless Steel
400-Series
Heat Treated
Stainless Steel
300-Series
Stainless Steel
BLK-NIT Black
Nitride
Black
Nitride
Passivated
and/or
Tested per
ASTM
A 967
SS 300-Series
Stainless Steel
400-Series
Heat Treated
Stainless Steel
300-Series
Stainless Steel
P Passivated
and/or
Tested per
ASTM
A 967
Passivated
and/or
Tested per
ASTM
A 967
Passivated
and/or
Tested per
ASTM
A 967
STL Carbon Steel Heat Treated
Carbon Steel
300-Series
Stainless Steel
NI Bright Nickel
per ASTM B
689
Type II,
Class 5
Bright Nickel
per ASTM B
689
Type II,
Class 5
Passivated
and/or
Tested per
ASTM
A 967

Installation

  1. Prepare correct sized mounting hole in sheet. Do not deburr hole edges.
  2. Insert fastener in recessed anvil, locate sheet hole over captive screw shank with hole punch side of sheet toward the retainer and center punch over screw thread.
  3. Squeeze the fastener between concentric and parallel anvil and punch surfaces. Use only enough pressure to seat the retainer shoulder flush with the sheet. Anvil and punch should be made from hardened tool steel or may be ordered using the PENCOM part numbers shown in the tables below.

Anvil And Punch Dimensions

Thread
Code
Anvil Punch
A
±0.05
C
±0.05
Part
Number
D
±0.05
Part
Number
M3 8.76 9.09 TL1314 5.01 TL1309
M3.5 8.76 9.91 TL1315 5.44 TL1304
M4 11.05 10.70 TL1316 5.97 TL1311
M5 11.05 11.48 TL1317 6.94 TL1312
M6 14.10 13.06 TL1318 7.97 TL1313

Performance

Thread
Code
Material
Code
Test Sheet Material
Aluminum Cold-rolled Steel
Installation
(kN)
Retainer
Push-out
(N)
Installation
(kN)
Retainer
Push-out
(N)
M3 SS 10.7 1068 13.3 1334
STL 1134
M3.5 SS 12.0 1223 15.6 1557
STL 1312
M4 SS 12.9 1334 16.9 1779
STL 1512
M5 SS 13.3 1779 17.8 2224
STL 1868
M6 SS 15.6 1779 22.2 2669
STL 2268
Performance data represents the average destructive result when all installation specifications are strictly followed. Variations in panel hole size, thickness, material, and installation methods will affect the loads. PENCOM strongly encourages testing in the application.