Grooved Pins & Studs

Grooved pins are non-threaded press fit fasteners — a fastener that is pressed into an appropriate sized hole, providing the proper interference fit to lock the fastener in place.

  • Commonly used as locking devices, pivots, bearing faces or locating elements where there is not a high degree of end load
  • Available with many different groove types
  • Typically zinc-plated, made from unhardened, low-carbon steel – but available in a wide range of finishes and heat treatments for shear resistance
  • Wide range of diameters, lengths and end configurations available

Shortest Lead Times on Custom Grooved Pins: How and When You Need Them

Driv-Lok is known for short lead times on custom pins. We haven’t settled on just having the shortest lead time, we continuously look to improve on lead time because in today’s competitive environment, it’s all about time and every day counts.

We know that customers need to be flexible and respond to their demanding environments to be successful. On average, we manufacture custom Grooved Pins in 15 days, and we aren’t going to stop there. Need Driv-Lok Grooved Pins in standard sizes immediately? We have partnered with Stocking Distributors that have immediate delivery.

Description

The groove of a grooved pin is formed by a swaging operation in which three tools penetrate the nominal diameter of the metal at 120° intervals. This penetration displaces a controlled amount of metal to each side of the grooving tool, forming a raised portion along the side of each groove.

The crest of these raised portions forms the expanded diameter or “Dx” dimension which is shown in Figure 1. The Dx is a few thousandths larger than the nominal diameter “D” of the pin. The amount of expansion varies with the diameter of the pin, the material being grooved, and the style of groove.

Function

When a grooved pin is used, the hole into which the pin is to be inserted is drilled a few thousandths larger than the nominal diameter of the pin. The hole must never be smaller than the nominal diameter of the pin. (See Grooved Pin Drilling Procedures and Hole Tolerances on page 4.)When the expanded portion of the pin is compressed by insertion into the hole, radial holding forces are generated as shown in Figure 2. These radial forces lock the pin securely into the drilled hole.

Dimensions


dime-4

CAD Diagram


Success stories


SITUATION

A heavy equipment manufacturer using a threaded fastener was experiencing loosening of the joint due to vibration in a hinged joint application. in addition, their current assembly method was extremely slow and ineffi cient.

SOLUTION

The Driv-Lok Inc. ENGINOMICS ® team introduced a Type “E” Groove Pin to the design. This pin eliminateD the loosening that the threaded fastener experienced. The team also designed an insertion press to install the pin. This press holds multiple pieces in place, hands free, while the pin is inserted into the application. The design
is such that the pin is installed to the same depth every time. The end result was a complete system to solve both the fastening and installation problems.

ADVANTAGES

  • HIGHLY EFFICIENT, HANDS-FREE ASSEMBLY METHOD
  • COST EFFECTIVE ASSEMBLY FUNCTION
  • LOWER INSTALLATION COSTS
  • ONE SOURCE FOR FASTENERS AND INSTALLATION

Click here for complete specifications

 

Grooved pin diameter / shaft size /
torque relationships.

 

This table is a guide in selecting the proper-size DRIV-LOK Grooved Pin to use for fastening machine members to shafts of given sizes and for specific load requirements. Torque and horsepower ratings are based on pins made of cold finished, low carbon steel and a safety factor of 8 is assumed.

Recommended pin diameter for various shaft sizes
and torque transmitted by pin in double shear

Shaft size

Pin diameter

Torque inch lbs.

H.P. at 100 R.P.M.

3/16

1/16

4.8

.007

7/32

5/64

8.5

.013

1/4

3/32

13.9

.022

5/16

7/64

23.8

.038

3/8

1/8

37.5

.060

7/16

5/32

62.9

.100

1/2

5/32

71.9

.114

9/16

3/16

116.4

.185

11/16

7/32

193.8

.307

3/4

1/4

275.6

.437

13/16

1/4

298.6

.474

7/8

1/4

322

.510

15/16

15/16

449

.712

1

15/16

479

.759

1 1/16

15/16

509

.807

1 1/8

3/8

773

1.23

1 3/16

3/8

816

1.30

1 1/4

3/8

859

1.36

1 5/16

7/16

1230

1.95

1 3/8

7/16

1289

2.05

1 7/16

7/16

1348

2.14

1 1/2

1/2

1838

2.92

Minimum double shear values (lbs.) of Driv-Lok pins of various

Grooved pins

Slotted spring pins

Pin diameter

Low carbon

Shear-proof alloy steel (RC 40-48)

Corrosion resistant steel

Brass

1074 steel
and 420 SS

1/16

410

720

540

250

430

3/32

890

1,600

1,240

560

1,150

1/8

1,600

2,820

2,200

990

1,875

5/32

2,300

4,520

3,310

1,540

2,750

3/16

3,310

6,400

4,760

2,200

4,150

7/32

4,510

8,770

6,480

3,020

5,850

1/4

5,880

11,500

8,460

3,950

7,050

5/16

7,660

17,900

12,700

6,170

10,800

3/8

11,000

26,000

18,200

9,050

16,300

7/16

15,000

35,200

24,800

12,100

19,800

1/2

19,600

46,000

32,400

15,800

27,100