Spring Pins technical specs

Tubular slotted spring pins are manufactured by progressive roll forming flat strips of high carbon steel or heat treatable 420 stainless steel. After forming, the pins are deburred to remove sharp edges, then heat treated to a spring temper. High carbon (1070-1095) steel spring pins are hardened to Rc 46-53 and 420 stainless steel spring pins are hardened to Rc 43-52.

Spring pins are manufactured to an oversize dimension so that when the pin is inserted into a hole, radial forces are generated against the hole wall holding the spring pin securely in place.

Standard spring pins are manufactured to ASME B18.8.2. Standard finishes for high carbon steel spring pins are either light oil or zinc. Standard stainless steel spring pins are passivated.

Spring pins will meet thousands of demanding industrial applications. Shown below are just a few of the possible uses for these rugged, self-locking pins. Be sure to contact DRIV-LOK, Inc. if you require engineering assistance for your application. Standard spring pin
Special spring pin

1. Grind a flat surface approximately .0015" deep on curved surface of the pin (opposite the gap) on pins 3/16" diameter and above, and .001" deep on pins below 3/16" diameter.

2. Grind a flat surface approximately .004" deep opposite and parallel to the first grinding–at the gap section.

3. Place surfaced pin gap side down on face plate anvil of Rockwell Tester.

4. Enter surfaced section opposite gap and use: a Superficial Tester 15N with N Brale Penetrator for diameters up to 1/8, a Penetrator C Brale 60 Kg for 1/8 to 5/16, and a Penetrator C Brale 150 Kg for pins 5/16 and over.

B Max

Stock
thickness

Recommended
hole size

Minimum
double shear
strength (lbs)

Nominal

Minimum
1/3 (D1+D2+D3)

Maximum
(Go ring range)

Min

Max

Min*

Max

1/16
(.062)

.066

.069

.059

.007

.028

.015

.063

.065

430

5/64
(.078)

.083

.086

.075

.008

.032

.018

.079

.081

800

3/32
(.094)

.099

.103

.091

.008

.038

.022

.095

.097

1,150

1/8
(.125)

.131

.135

.122

.008

.044

.028

.125

.129

1,875

5/32
(.156)

.162

.167

.151

.010

.048

.032

.157

.160

2,750

3/16
(.187)

.194

.199

.182

.011

.055

.040

.188

.192

4,150

7/32
(.219)

.226

.232

.214

.011

.065

.048

.219

.224

5,850

1/4
(.250)

.258

.264

.245

.012

.065

.048

.250

.256

7,050

5/16
(.312)

.321

.330

.306

.014

.080

.062

.313

.318

10,800

3/8
(.375)

.385

.395

.368

.016

.095

.077

.375

.382

16,300

7/16
(.437)

.448

.459

.430

.017

.095

.077

.438

.445

19,800

1/2
(.500)

.513

.524

.485

.025

.110

.094

.500

.510

27,100

Spring pin length:
Up to and including 1"
Over 1" through 2"
Over 2" through 3"
Over 3" through 4"
Over 4"

Tolerance:
±.015
±.020
±.030
±.035
±.040

*Minimum hole sizes are rounded up to 3 decimal places.

Heavy duty, standard duty and light duty coiled pins

Nominal
size or
basic pin
diameter
[Note (1)]

Recommended
hole size

Double shear load, min., lb.

Pin diameter

Chamfer

Standard
duty

Heavy
duty

Light
duty

Standard duty

Heavy duty

Light duty

Dia.

Length

Material

Max.
Note 2

Min.
Note 3

Max.
Note 2

Min.
Note 3

Max.
Note 2

Min.
Note 3

Max

Ref

Max

Ref

Carbon
steel

1/8 (.125)
5/32 (.156)
3/16 (.188)
7/32 (.219)
1/4 (.250)

.138
.171
.205
.238
.271

.131
.163
.196
.228
.260

.136
.168

.202

.235

.268

.130

.161

.194

.226

.258

.139

.172

.207

.240

.273

.131

.163

.196

.228

.260

.121
.152
.182
.214
.243

.044

.048

.055

.065

.129

.160

.192

.224

.256

.124

.155

.185

.217

.247

1,400

2,200

3,150

4,200

5,500

2,000

3,100

4,500

5,900

7,800

825

1,300

1,900

2,600

3,300

NOTES:
1. Where specifying nominal size in decimals, zeros preceding the decimal shall be omitted.
2. Maximum diameter shall be checked by GO ring gage.
3. Minimum diameter shall be checked by NO GO ring gage.