Favorites (0) Store
Call us +48 33 870 42 00

Piston pin Engine / Motor KMP 4BT3.9 / 6BT5.9 3934047

KMP piston pin for Cummins 4BT3.9 / 6BT5.9 – durable, precise and wear-resistant element of the crank-piston system.

  • Condition: new
  • SKU: 25139
Ocena 4,9

9.41 EURNet

- +

Product description

Piston pin KMP 4BT3.9 / 6BT5.9 – durability and precision

The piston pin is one of the key components in the construction of an internal combustion engine. The KMP product, dedicated to 4BT3.9 and 6BT5.9 units, stands out with high resistance to mechanical loads and long service life. Thanks to precise manufacturing, it ensures perfect transfer of forces between the piston and the connecting rod, which translates into stable and reliable engine operation.

Description

The piston pin serves as a connector between the piston and the connecting rod, transferring huge loads resulting from cylinder operation. Made of high-quality steel, resistant to wear and deformation, it guarantees long-lasting use even under the toughest conditions. The KMP product meets OEM quality standards, making it a safe replacement for original Cummins parts.

Technical data

  • Material: high-quality steel
  • Outer diameter: matched to 4BT3.9 / 6BT5.9 pistons
  • Heat treatment: hardened for increased durability
  • Resistance to dynamic loads: high
  • Compatibility: Cummins 4BT3.9, 6BT5.9 engines

Application

The KMP piston pin is used in Cummins engines installed in construction machinery, agricultural equipment, power generators and commercial vehicles. Thanks to its durability and precision, it is suitable both for new engines and for engine overhauls.

Properties

  • High wear and abrasion resistance
  • Stable transfer of forces between piston and connecting rod
  • Easy installation without additional machining
  • Long service life under harsh working conditions
  • OEM quality standards compliant

Specification

Specification Value
name Piston pin Engine / Motor
mark KMP
type 4BT3.9 / 6BT5.9
part number 3934047
condition new
outer diameter matched to 4BT3.9 / 6BT5.9
material high-quality steel
heat treatment hardened
resistance high dynamic load capacity

Reference numbers

List of reviews:

Emily

2025-10-02

The part fits perfectly and works great. Fast shipping and good quality. Highly recommend!
Adam

2025-10-02

Zamówienie zrealizowane sprawnie, a produkt spełnia moje oczekiwania. Na pewno wrócę po więcej części.
Adam

2025-10-02

Bardzo dobra jakość, sworzeń montuje się bez problemów. Zdecydowanie warto zainwestować.
Grzegorz

2025-10-02

Sworzeń działa bez zarzutu, idealnie pasuje do mojego silnika. Szybka dostawa, polecam!
Tomasz

2025-09-04

Część wygląda na solidnie wykonaną. Działa zgodnie z oczekiwaniami.
Tomasz

2025-09-04

Produkt spełnia swoje podstawowe funkcje. Montaż przebiegł bez problemów.
Barbara

2025-08-27

Produkt spełnia oczekiwania. Pasuje do maszyny i działa poprawnie.
Marek

2025-04-21

Sworzeń działa bez zarzutu, idealnie pasuje do mojego silnika. Jakość wykonania na wysokim poziomie. Polecam każdemu, kto potrzebuje solidnej części do maszyn budowlanych.

Write a review.

See also

Discover our wide range of products

new Engine piston STD, 122mm wbk 9884512
Connecting rods and pistons

Engine piston STD, 122mm wbk 9884512

188.28 EURNet

- +
new Piston rings STD wbk 10145869/10145867/10145868
Connecting rods and pistons

Piston rings STD wbk 10145869/10145867/10145868

82.37 EURNet

- +
new Connecting rod screw BF Original 20060551038
Connecting rods and pistons

Connecting rod screw BF Original 20060551038

3.29 EURNet

- +
new Connecting rod bush STD wbk 4891178
Connecting rods and pistons

Connecting rod bush STD wbk 4891178

4.71 EURNet

- +
new Piston rings STD wbk 4955251
Connecting rods and pistons

Piston rings STD wbk 4955251

21.18 EURNet

- +
new Engine piston STD, 94mm Kolbenschmidt 94900600
Connecting rods and pistons

Engine piston STD, 94mm Kolbenschmidt 94900600

51.31 EURNet

- +
new Connecting rod screw M14x1.5x65mm wbk 9174981
Connecting rods and pistons

Connecting rod screw M14x1.5x65mm wbk 9174981

7.53 EURNet

- +
new Engine piston Cummins 4955160
Connecting rods and pistons

Engine piston Cummins 4955160

105.91 EURNet

- +
new Piston rings STD Kolbenschmidt 800046410000
Connecting rods and pistons

Piston rings STD Kolbenschmidt 800046410000

21.18 EURNet

- +
new Connecting rod bush SEMI Kolbenschmidt 77605690
Connecting rods and pistons

Connecting rod bush SEMI Kolbenschmidt 77605690

19.30 EURNet

- +
new Connecting rod bush SEMI Kolbenschmidt 71813690
Connecting rods and pistons

Connecting rod bush SEMI Kolbenschmidt 71813690

5.41 EURNet

- +
new Piston with bolt (pin) Cummins 4933120
Connecting rods and pistons

Piston with bolt (pin) Cummins 4933120

49.42 EURNet

- +
Bosch Rexroth parts catalog

Bosch Rexroth parts catalog

More

Check out our offer of hydraulic systems for the popular brand Bosch Rexroth.

Construction Machinery Service

Construction Machinery Service

More

We offer comprehensive support for both stationary and mobile repair of construction machinery.

Hydraulic Pumps and Motors Repairs

Hydraulic Pumps and Motors Repairs

More

Repair and regeneration of hydraulic components: hydraulic motors and pumps.

Combustion Engine Repairs

Combustion Engine Repairs

More

Comprehensive repairs of internal combustion engines: verification, parts replacement, repair, and performance testing.

Construction Machinery Purchase

Construction Machinery Purchase

More

Purchase of excavators, loaders, bulldozers, and dumpers in complete, incomplete, or damaged condition.

Google

Opinion 5/5

Zakupiony komplet siłowników do Liebherr 564 był w doskonałym stanie, zgodnie z opisem i przesłanymi zdjęciami. Obsługa na wysokim poziomie, bardzo profesjonalna i pomocna – rewelacja. Co więcej, w kontakcie z firmą otrzymałem osobistego opiekuna, który zajmował się sprawą od początku do końca, mogłem również liczyć na bezpłatne doradztwo przy montażu. Szkoda, że w obecnych czasach nie spotyka się zbyt wielu firm z tak profesjonalnym podejściem do klienta. Gorąco polecam.

Mateusz Lenart

Google

Opinion 5/5

Współpraca na wysokim poziomie. Firma na 6. Polecam z czystym sumieniem. Na pewno jeśli będę musiał to skorzystam jeszcze raz. Naprawa Pomp hydrauliki Koparka Terex

Kamil Przybysz

Google

Opinion 5/5

Znakomita obsługa. Przyjazny i pomocny personel. Płatność, cło i transport zostały zrealizowane szybko i profesjonalnie.

William L Park

Google

Opinion 5/5

Jestem bardzo zadowolony z naszej współpracy. Dobry zespół, dobra obsługa, dobra cena, dobre części. Dziękuję!

Tiberiu Demeter

Google

Opinion 5/5

Oryginalne części, niesamowicie szybka międzynarodowa dostawa ekspresowa i obsługa na najwyższym poziomie. W przyszłości wrócimy, aby ponownie robić interesy. Dziękuję!

Jinajon

Technical materials

Here you will find texts about construction machinery - technical advice, as well as news and events from the industry.

Renovation of the Cummins QSB4.5 Engine in the Dressta TD-10R Bulldozer
2026-05-14

Renovation of the Cummins QSB4.5 Engine in the Dressta TD-10R Bulldozer

See more
Engine Overhaul of Liebherr D926 TI-E A4 in Liebherr LTM 1500-8.1 Mobile Crane
2026-05-13

Engine Overhaul of Liebherr D926 TI-E A4 in Liebherr LTM 1500-8.1 Mobile Crane

See more
Repair of the Liebherr D 9408 TI-E Engine in the LTM 1800 Crane
2026-05-12

Repair of the Liebherr D 9408 TI-E Engine in the LTM 1800 Crane

See more
Overhaul of the D926 TI-E Engine in the Liebherr LTM 1050/1 Mobile Crane
2026-05-08

Overhaul of the D926 TI-E Engine in the Liebherr LTM 1050/1 Mobile Crane

See more
Renovation of the Liebherr D9508 A7 Engine in the LR 1300 Crane
2026-05-06

Renovation of the Liebherr D9508 A7 Engine in the LR 1300 Crane

See more
Engine Overhaul of Cummins QSB6.7 in Hyundai HL960 HD Loader
2026-05-05

Engine Overhaul of Cummins QSB6.7 in Hyundai HL960 HD Loader

See more
Directions
load
Cookie preferences
We use cookies to provide essential website functionality and improve your online experience. You can choose for each category whether you want to accept or reject it at any time.
Essential cookies
Preference cookies
Analytical cookies
Marketing cookies
Uncategorized cookies

Detailed information on how we handle cookies can be found in our Privacy Policy

Consent granted on:
Consent ID: