Leaf Spring Pins For Heavy Duty Trucks & Trailers
+1-989-755-0561 1-800-358-4751

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 M5447
$27.95

Kenworth threaded spring pin M5447. Use with MTB178 or MTB186 bushings.   Details

20+ In Stock as of October 19, 2021 19:38 PM EST.
  • Application:Kenworth
  • Spring Pin Type:Threaded
  • Diameter:27mm
  • Length:177mm
  • Thread Size:M33.5-4
  • Center-To-Center:138mm
  • Dayton Number:327-544
  • Kenworth Number:B656008, B65-6008
  • UPC: 889626122187
  • MPN: M5447
SKU B1408H-46
$17.09

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

20+ In Stock as of October 19, 2021 19:35 PM 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 M5449
$32.04

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

19 In Stock as of October 19, 2021 19:38 PM 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 M5451
$17.15

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

9 In Stock as of October 19, 2021 19:35 PM 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 43146-K
$40.65

Hendrickson double keeper spring pin mounting kit 43146-K.   Details

2 In Stock as of October 19, 2021 19:35 PM EST.
  • Spring Pin Type:Smooth
  • Location:Front of Rear
  • Diameter:1.375 inches
  • Length:6.900 inches
  • Center-To-Center:5.375 inches
  • Automann Number:M5240
  • Batco Number:09-5673
  • Dayton Number:327-437
  • Euclid Number:E3761
  • Flagg Number:B1386-50
  • Ford Number:E3HT5780BA, E3HZ5780A
  • Gaumers Number:21386
  • Hendrickson Number:43146, 43146000, 43146000L
  • International Number:1611848C1
  • Meritor Number:R303761
  • Midland Number:CS70632B
  • Volvo Number:3082223
  • MPN: 43146-K
SKU B1408-46
$17.96

Spring pin B1408-46 fits Freightliner front of front spring applications. 4.0 inch spring width. 1.   Details

Typically ships in 7 to 10 business days.
  • Application:Freightliner
  • Spring Pin Type:Smooth
  • Diameter:1.250 inches
  • Length:6.906 inches
  • Center-To-Center:5.375 inches
  • Automann Number:M5284
  • Dayton Number:327-487
  • Euclid Number:E8796
  • Flagg Number:B1408-46
  • Freightliner Number:1612373000, 16-12373-000
  • Gaumers Number:21408
  • Meritor Number:R308796
  • MPN: B1408-46
SKU B1490-59
$23.76

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

20+ In Stock as of October 19, 2021 19:38 PM 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 B1491-96
$27.22

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

12 In Stock as of October 19, 2021 19:35 PM 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 M5305
$26.48

Spring pin M5305 fits Peterbilt front 4 inch spring applications. 1.25 inch diameter, 7.   Details

4 In Stock as of October 19, 2021 19:35 PM EST.
  • Application:Peterbilt
  • Spring Pin Type:Smooth
  • Diameter:1.250 inches
  • Length:7.750 inches
  • Center-To-Center:6.500 inches
  • Automann Number:M5305
  • Dayton Number:327-532
  • Peterbilt Number:0204024, 02-04024, B656002, B65-6002
  • MPN: M5305
SKU B1403-75
$19.35

Spring pin B1403-75 fits Peterbilt front and rear of front spring applications.   Details

6 In Stock as of October 19, 2021 19:35 PM EST.
  • Application:Peterbilt
  • Spring Pin Type:Smooth
  • Diameter:1.250 inches
  • Length:6.141 inches
  • Center-To-Center:5.031 inches
  • Automann Number:M5274
  • Dayton Number:327-446
  • Flagg Number:B1403-75
  • Peterbilt Number:0201561, 02-01561
  • MPN: B1403-75
SKU 32277H-K
$36.15

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

5 In Stock as of October 19, 2021 19:35 PM 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
SKU 43146-000L
$23.74

Spring pin 43146-000L for Hendrickson applications. 6.900 inch length, 1.375 inch diameter, 5.   Details

Typically ships in 7 to 10 business days.
  • Application:Hendrickson
  • Spring Pin Type:Smooth
  • Diameter:1.375 inches
  • Length:6.900 inches
  • Center-To-Center:5.375 inches
  • Automann Number:M5240
  • Batco Number:09-5673
  • Dayton Number:327-437
  • Euclid Number:E3761
  • Flagg Number:B1386-50
  • Ford Number:E3HT5780BA, E3HZ5780A
  • Gaumers Number:21386
  • Hendrickson Number:43146, 43146000, 43146000L
  • International Number:1611848C1
  • Meritor Number:R303761
  • Midland Number:CS70632B
  • Volvo Number:3082223
  • MPN: 43146-000L

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

Leaf Spring Pin
  • 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.

  • Leaf Spring Pin
  • 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

    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.

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