Spring Pins

We stock leaf spring pins for just about every type of semi truck and trailer. We have years of experience selling and installing replacement spring pins. Feel free to call us at 800-358-4751 if you need help finding the correct parts for your leaf springs.

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SKU B1397-55

$17.55

Spring Pin | International | Rear of Front

Spring pin B1397-55 for International spring applications. Details

Typically ships in 3 to 4 business days.

Application:International
Spring Pin Type:Smooth
Diameter:1.000 inch
Length:5.563 inches
Center-To-Center:3.906 inches
Automann Number:M5262
Dayton Number:327-295
Flagg Number:B1397-55
Gaumers Number:21397
International Number:468706C2
Note:Included in MIS1416 shackle kit
MPN: B1397-55

SKU B1408H-46

$17.09

Spring Pin | Freightliner | Front of Front | Helical

Helical groove spring pin B1408H-46 for Freightliner applications. 6.906 inch length, 1. Details

20+ In Stock as of September 10, 2021 7:32 AM EST.

Application:Freightliner
Spring Pin Type:Helical
Location:Front of Front
Diameter:1.250 inches
Length:6.906 inches
Center-To-Center:5.375 inches
Automann Number:M5284H
Dayton Number:327-487
Euclid Number:E8796
Flagg Number:B1408-46
Freightliner Number:1613078000, 16-13078-000
Gaumers Number:21408
Meritor Number:R308796
Note:For Spring Pin without groove use B1408-46
MPN: B1408H-46

SKU B1490-59

$23.76

Threaded Spring Pin | Kenworth

Kenworth Threaded Spring Pin, front and rear of front for 1996-2000 T2000. Details

20+ In Stock as of September 10, 2021 7:35 AM EST.

Application:Kenworth
Spring Pin Type:Threaded
Diameter:27mm
Length:186mm
Thread Size:M33.5-4
Center-To-Center:146mm
Automann Number:M5448
Dayton Number:327-537
Flagg Number:B1490-59
Kenworth Number:B651002, B65-1002
Note:Use with MTB178 threaded bushing
MPN: B1490-59

SKU M5451

$17.15

Spring Pin | Volvo-White, Mack | Front

Spring pin M5451 fits Volvo/White and Mack front spring applications. Both ends greaseable. Details

9 In Stock as of September 10, 2021 7:32 AM EST.

Application:Volvo/White
Application:Mack
Spring Pin Type:Threaded
Diameter:30mm, 38mm
Length:170mm
Thread Size:M33.5-4
Center-To-Center:141mm
Dayton Number:327-533
Mack Number:10QK3106M
Volvo Number:1076334, 20747781
MPN: M5451

SKU M5449

$32.04

Threaded Spring Pin | Kenworth

Kenworth, Peterbilt threaded spring pin. Use with MTB186 threaded bushing. 1.062 inch diameter, 7. Details

20+ In Stock as of September 10, 2021 7:35 AM EST.

Application:Kenworth
Application:Peterbilt
Spring Pin Type:Threaded
Diameter:1.062 inches
Length:7.870 inches
Thread Size:M33.5-4
Center-To-Center:6.330 inches
Dayton Number:327-540
Kenworth Number:B651008, B65-1008, PB641008, PB64-1008
Note:Use with MTB186 threaded bushing
MPN: M5449

SKU B1399-62

$30.60

Spring Pin | Mack | Threaded | Rear of Front

Threaded spring pin B1399-62 fits rear of front spring applications. Fits Mack RB, R, RD series. 1. Details

4 In Stock as of September 10, 2021 7:32 AM EST.

Application:Mack
Spring Pin Type:Threaded
Diameter:1.063 inches
Length:6.625 inches
Thread Size:1-3/8 inch -6
Center-To-Center:5.000 inches
Automann Number:M5266
Dayton Number:327-331
Euclid Number:E3717
Flagg Number:B1399-62
Gaumers Number:21399
Mack Number:25161382, 44QK26A
Meritor Number:R303717
MPN: B1399-62

SKU B1400-55

$23.76

Spring Pin | International | Threaded | Front and Rear of Front

Threaded spring pin B1400-55 fits International front and rear of front spring applications. Details

20+ In Stock as of September 10, 2021 7:32 AM EST.

Application:International
Spring Pin Type:Threaded
Diameter:1.000 inches
Length:7.375 inches
Thread Size:1-3/8 inch -6
Center-To-Center:5.750 inches
Automann Number:M5268
Dayton Number:327-443
Flagg Number:B1400-55
Gaumers Number:21400
International Number:507203C1, 507203C2
Note:Use with MTB76 threaded bushing. Included in MIS1436, MIS1456 and MIS1476 shackle kits
MPN: B1400-55

SKU B1434-55

$17.55

Spring Pin | International | Front and Rear of Front

Spring pin B1434-55 fits International front and rear of front spring applications. 6. Details

1 In Stock as of September 10, 2021 7:32 AM EST.

Application:International
Spring Pin Type:Smooth
Diameter:1.250 inches
Length:6.75 inches
Center-To-Center:5.000 inches
Automann Number:M5336
Dayton Number:327-480
Flagg Number:B1434-55
Gaumers Number:21434
International Number:1661976C3, 3511254C1, 1661976C2
Note:Included in MIS1466 shackle kit
MPN: B1434-55

SKU B1446-59

$26.67

Spring Pin | Kenworth | Threaded | Front of Front

Threaded spring pin B1446-59 fits Kenworth front of front spring applications. 4.0 inch spring. Details

8 In Stock as of September 10, 2021 7:32 AM EST.

Application:Kenworth
Spring Pin Type:Threaded
Diameter:1.500 inches
Length:7.375 inches
Thread Size:1-3/8 inch -6
Center-To-Center:5.750 inches
Automann Number:M5360
Dayton Number:327-297
Flagg Number:B1446-59
Kenworth Number:6262, 6262KW, 0201713
Note:Similar to shackle pin M4910
MPN: B1446-59

SKU B1491-96

$27.22

Spring Pin | Mack-Volvo | Threaded | Front

Threaded spring pin B1491-96 fits Mack and Volvo front spring applications. Fits Mack VN series. Details

4 In Stock as of September 10, 2021 7:32 AM EST.

Application:Volvo
Application:Mack
Spring Pin Type:Threaded
Diameter:1.181 inches
Length:6.692 inches
Thread Size:M33.5-4
Center-To-Center:5.551 inches
Automann Number:M5450
Flagg Number:B1491-96
Mack Number:10QK3105M, 10QK3106M, 10QK3112M, 10QK3113M
Volvo Number:1075723, 1076334
Note:Uses MTB180 threaded bushing
MPN: B1491-96

SKU M5297

$80.22

Spring Pin | KME | Rear of Front

Spring pin M5297 for rear of front spring. 5.875 inch length x 1 inch diameter, 4. Details

6 In Stock as of September 10, 2021 7:32 AM EST.

Application:KME
Spring Pin Type:Smooth
Diameter:1.000 inch
Length:5.875 inches
Center-To-Center:4.520 inches
Automann Number:M5297
KME Number:023658F, 071295V
Pierce Number:400190, 40-0190, 409259, 40-9259, 409529, 40-9529, 1006380
UPC: 889626122248
MPN: M5297

SKU 32277H-K

$36.15

Spring Pin Mounting Kit | Hendrickson | Single Keeper Pin | Grooved

Hendrickson single keeper grooved spring pin mounting kit 32277-K. Details

7 In Stock as of September 10, 2021 7:32 AM EST.

Application:Hendrickson
Spring Pin Type:Grooved
Diameter:1.375 inches
Length:7.312 inches
Automann Number:M5224
Batco Number:09-5671
Dayton Number:3274-107
Euclid Number:E1818
Flagg Number:B1378-50
Gaumers Number:21378
Hendrickson Number:13938, 13938000, 32277, 32277000
Meritor Number:R301818
Midland Number:CS66665B
MPN: 32277H-K

What is a leaf spring pin?

A spring pin is the pivot and attachment point used on many leaf spring suspensions using brass bushings. The spring pin will be made of hardened steel, and it may be smooth sided or threaded. Spring pins will be drilled and tapped for grease zircs and may have channels in the body to more effectively deliver grease to the spring bushings. Leaf spring pins may have notches cut into them where bolts are used to lock them into place and keep them centered.

Leaf Spring pin types

Smooth Pins – Will be smooth down the body of the pin. Smooth spring pins will normally have one or two notches used to center the pin in the spring hanger and hold it into place. Some suspensions will require shimming to keep the spring centered on the pin during sideloading as there may be gaps between the spring and the frame hanger.

Threaded Pins – Coarsely threaded like a large bolt, threaded pins will be used in threaded type spring bushings. Threaded spring pins may have the threaded area only in the center of the pin, or it may be down the length of the pin body. Threaded pins are used to help with spring movement due to side loading.

Why should you replace leaf spring pins?

With the correct preventative maintenance, spring pins should last the life of the spring. With adequate grease, they can provide years of reliable use. When proper maintenance is skipped, the pins can wear or bind bringing an early need for replacement. When changing springs, it is always recommended to change the pins as the bushings, and the pins will wear together and re-using spring pins may cause your spring bushings to wear out rapidly. Lack of grease can cause damage to the spring and hanger bushings and may require replacement of the bushings or hangers as well as the pins. In severe cases, a spring pin can bind so badly in the bushing that the spring may break from the extra stress.

Damaged Spring Pins Pictured

Measuring Leaf spring pins for replacement and identification

When replacing leaf spring pins, it is important to measure your old pins correctly to ensure a matching replacement can be ordered. Below you will find the information you should obtain before looking for replacement pins:

Vehicle application – Knowing the application will be necessary for threaded pins as there are no normal means of identifying the thread size and pitch used. The threads for threaded spring pins exceed what will normally be found on typical thread gauges for size and thread pitch. The application can also help narrow down pins that may be similar in dimension.
Pin diameter – Measure the diameter of the body of the pin where it will contact the spring bushing. If the pin in severely worn, it may be necessary to use information from the lead spring to order replacement pins. If the diameter of the pin changes on one or both ends also note that dimension.
Pin length – Measure the total length of the pin from end to end.
Distance between locking notches – If the pin had locking notched cut into it measure the center to center distance between the two. If only one notch is used, measure the distance between the center of the notch and the closest end of the pin.
Locking mechanism type – Spring pins with lock notches will use bolts, square keepers, or cotter pins. Identify the type used on your suspension setup and take note.
Grease zirc locations – Due to limited access some spring pins may have more than one grease zirc or multiple threaded holes for grease zircs. This will be important to ensure you can service the spring pin after the installation is done.