Bolt and screw – solutions for marine & industrial
Every engine relies on a secure and vibration-resistant fastening system. A high-quality bolt and screw setup holds together engine blocks, manifolds, and accessories across diesel, gas, and marine systems. In industrial applications, engine screws and motor bolts provide structural stability, resist thermal cycling, and support precision alignment. For marine use, corrosion-resistant marine bolt and marine screws ensure lasting safety even in harsh saltwater environments.
Choose from following:
- 81904900767 suitable for MAN D engines
Robust External Hex Round Bolt for Reliable Applications Discover our External Hex Round Bolt, a high-quality OEM spare part with the comparison number 81904900767. This product is essential for anyone who values quality and durability. The bolt is specifically designed to provide a strong connection in demanding applications.Suitable for MAN D Engines: Optimal Connection This spare part is suitable for MAN D engines and meets the high standards of the industry. Our External Hex Round Bolt with the comparison number 81904900767 ensures reliable functionality that you would expect from OEM spare parts. Benefit from the robustness that is specially designed for use in various engines.
SCREW/BOLT - 81904900766 suitable for MAN D engines
Precise Screw with Comparison Number 81904900766The screw with the comparison number 81904900766 is an essential component specifically designed for use in engines. This product stands for the highest precision and is suitable for MAN D engines to ensure optimal functionality.Original Equipment Quality for ReliabilityOur screw impresses with its component quality, meeting the demands of modern engines. Every part in our range, including the screw with comparison number 81904900766, is designed to deliver durable results and support the performance of your engine.
- 81904900764 suitable for MAN D engines
External Hex Round Bolt Compatible with MAN D EnginesDiscover the External Hex Round Bolt with the comparison number 81904900764, which is perfectly suitable for use in MAN D engines. This product ensures a reliable connection and is part of our selection of precise screws.OEM Replacement Parts for the Highest StandardsOur External Hex Round Bolt is an OEM replacement part specifically designed for MAN D engines. With over 25 years of experience, we provide products that meet the high demands of the industry and fulfill your needs.
- 81904900759 suitable for MAN D engines
External Hex Round Bolt: Precision for MAN D EnginesDiscover our External hex round bolt, which is designated under the comparison number 81904900759. This OEM spare part is essential for the maintenance and operation of engines that must withstand the highest demands.
SCREW/BOLT - 81904900758 suitable for MAN D engines
Screw – Comparison Number 81904900758Our screw with the comparison number 81904900758 is a reliable OEM replacement part specifically designed for optimal performance. This product is crucial for the performance of your engines and ensures that you receive the quality you expect from MOPA Motorparts.Suitable for MAN D Engines – Perfect FitThis OEM replacement part is suitable for MAN D engines and ensures a perfect fit. The quality of this screw, which belongs to the article group "Screws," ensures that your machines operate efficiently and reliably.
CYLINDER SCREW - 81904900755 suitable for MAN D engines
Premium Cylinder Screw for Your EnginesDiscover the cylinder screw compatible with MAN D engines with the comparison number 81904900755. This product belongs to the article group screws and stands for reliability in your marine or stationary application.Reliable OEM Replacement Parts for MAN DOur cylinder screw is an OEM replacement part that offers you optimal performance. The comparison number 81904900755 represents the high quality that we ensure as a reliable supplier of OEM replacement parts. Trust in the durability and efficiency of this cylinder screw.
SCREW/BOLT - 81904900754 suitable for MAN D engines
Perfect Screw – Suitable for MAN D EnginesDiscover the screw with the comparison number 81904900754, which has been developed as an OEM replacement part. This product meets all the requirements for engines that are suitable for MAN D engines. Our screw offers quality that only OEM replacement parts can provide.Comparison Number 81904900754 and its FunctionThe comparison number 81904900754 uniquely identifies our screw. It plays a central role in the item group "Screws" and is crucial for the operation of your engines. Rely on this quality to ensure the performance and longevity of your machines.
SCREW/BOLT - 81904900751 suitable for MAN D engines
Reliable Screw for MAN D EnginesThe screw with the comparison number 81904900751 is an essential OEM replacement part, suitable for MAN D engines. This screw impresses with its robustness and durability, making it ideal for marine and stationary use. Rely on quality that is specifically tailored to the demands of these engines.Efficient Performance with OEM Replacement PartsOur product, the screw with the comparison number 81904900751, is made from high-quality material and meets the standards of original equipment manufacturer quality. By using OEM replacement parts, we ensure that the performance of your engines is optimized. Count on quality that has proven itself.
HEXAGON BOLT - 81904900747 suitable for MAN D engines
Hexagon Bolt for Reliable EnginesDiscover the Hexagon bolt, an essential product with the comparison number 81904900747, specifically designed for the demands of engine technology. The bolt is suitable for MAN D engines and offers the highest reliability for your equipment.Features of the OEM Replacement PartThis component comes as an OEM replacement part and ensures top quality for your diesel and gas engines. As the Hexagon bolt is suitable for MAN D engines, you can be assured that it works optimally in your system.
HEXAGON BOLT - 81904900746 suitable for MAN D engines
Hexagon bolt with comparison number 81904900746Discover our Hexagon bolt with the comparison number 81904900746. This product is specifically designed for MAN D engines and belongs to the article group "Screws." It is essential for the reliable operation of your engines.
HEXAGON BOLT - 81904900745 suitable for MAN D engines
Hexagon Bolt – Comparison Number 81904900745Discover the Hexagon bolt with the comparison number 81904900745, which is an essential component for your suitable for MAN D engines. This OEM replacement part offers you the assurance of a perfect fit and optimal functionality. Trust the quality that you can expect from a replacement part.Suitable for MAN D Engines – Reliable PerformanceOur Hexagon bolt is suitable for MAN D engines and belongs to the article group Screws. These reliable OEM replacement parts are essential for the sustainable maintenance and repair of your engines. By using these components, you ensure the longevity and efficiency of your machines.
CYLINDER SCREW - 81904900744 suitable for MAN D engines
Quality Product: Cylinder Screw with Comparison Number 81904900744Discover the cylinder screw with the comparison number 81904900744, a crucial OEM replacement part specifically designed for use in MAN D engines. This cylinder screw belongs to the category of screws and is of top-notch quality to optimally support the performance of your engines. Weighing only 0.02 kg, this cylinder screw offers excellent fitting accuracy and durability that you need in your engine technology.
FITTING BOLT - 81904900742 suitable for MAN D engines
Precision Fitting Bolt for Your EngineDiscover the fitting bolt, an important product suitable for MAN D engines, with the comparison number 81904900742. This bolt belongs to the category of screws and impresses with its excellent workmanship and reliability. Weighing just 0.01 kg, it perfectly fulfills the requirements for your engine operation.Excellent OEM Replacement Parts for the Highest DemandsOur fitting bolt, a top-quality OEM replacement part, ensures a precise fit for MAN D engines. It has been manufactured with the highest standards in mind to maximize the performance of your diesel or gas engine. Rely on OEM replacement parts that have been specifically developed for demanding applications in the marine and stationary sectors.
COUNTERSUNK SCREW - 81904900740 suitable for MAN D engines
Countersunk screw with comparison number 81904900740Discover the countersunk screw with the comparison number 81904900740, designed specifically to optimize the performance of your engines. This countersunk screw is an essential component in the category of screws and weighing only 0.001 kg, it is lightweight yet robust – ideal for demanding applications.
PAN-HEAD SCREW - 81904900737 suitable for MAN D engines
Robust Pan-head Screw for Optimal PerformanceDiscover the pan-head screw with the comparison number 81904900737, specifically designed to optimally supply engines suitable for MAN D. This OEM replacement part represents the best quality and precision to enhance the performance of your engines. Weighing only 0.01 kg, the pan-head screw is both lightweight and robust, ideal for demanding applications in various settings.Detailed Specifications and QualityThe pan-head screw belongs to the category of screws and is designed for MAN D engines. These OEM replacement parts ensure that all engine components remain securely connected, significantly increasing the lifespan of your engines. You can rely on the quality and reliability of each of our products.
FITTING BOLT - 81904900735 suitable for MAN D engines
Precise Fitting Bolt – Your Reliable CompanionDiscover the fitting bolt with the comparison number 81904900735, specially designed to fit MAN D engines. This product belongs to the category of screws and impresses with its precise workmanship, enabling a reliable connection. Weighing only 0.015 kg, it offers optimal handling and easy installation.OEM Replacement Parts for Your ApplicationsThis fitting bolt is an OEM replacement part that ensures it meets the high standards of the manufacturers. If you are looking for a product that fits your engines perfectly, the fitting bolt 81904900735 is the perfect choice. Rely on quality and precision for your applications.
SCREW/BOLT - 81904900730 suitable for MAN D engines
Precise Screw for Demanding EnginesDiscover the precise screw with the comparison number 81904900730, specifically designed for the needs in marine and stationary applications. This OEM replacement part impresses with its meticulous processing and is an essential element for the maintenance of your engines. Weighing only 0.05 kg, the screw is easy to handle yet robust enough to withstand practical demands.
PAN-HEAD SCREW M8X18-ST-H3I - 81904900728 suitable for MAN D engines
Optimal Replacement Part: Pan-head screw m8x18-st-h3iDiscover the pan-head screw m8x18-st-h3i, an essential replacement part with the comparison number 81904900728, suitable for MAN D engines. This component provides a reliable connection that optimizes the performance of your engines and ensures a long service life.Efficient Handling with Light WeightWeighing only 0.01 kg, the pan-head screw m8x18-st-h3i is easy to handle and can be seamlessly integrated into your existing inventory. Our over 25 years of expertise ensures that you can choose the right product from more than 1 million replacement parts that meet your requirements optimally.
ADJUSTING SCREW - 81904900727 suitable for MAN D engines
Adjusting screw for MAN D enginesDiscover the adjusting screw with the comparison number 81904900727, specifically designed to perfectly harmonize with engines suitable for MAN D. This part belongs to the category of screws and offers reliable and durable performance that meets the high demands in marine and stationary applications.Excellent quality of OEM replacement partsThe adjusting screw is a replacement part that stands out for its first-class workmanship. Weighing only 0.02 kg, this product is not only lightweight but also ensures robust functionality. Trust in our replacement parts that are offered in original equipment quality and meet the standards of the original manufacturers.
ADJUSTING SCREW - 81904900725 suitable for MAN D engines
Adjusting Screw for Maximum EfficiencyDiscover the adjusting screw with the comparison number 81904900725, an essential OEM spare part for your engines. Weighing only 0.06 kg, this product offers excellent fit and performance. It is a critical component designed specifically for demanding applications in your machinery.Perfect Fit for MAN D EnginesThis OEM spare part is suitable for MAN D engines and is characterized by precise workmanship. The comparison number 81904900725 ensures that you are acquiring a component that meets the stringent quality standards essential for MAN D engines. Rely on the reliability and durability that you can expect from OEM spare parts.
HEXAGON BOLT - 81904900724 suitable for MAN D engines
Robust Hexagon Bolt for Reliable ApplicationsDiscover our hexagon bolt, comparison number 81904900724, an important OEM spare part. This product is particularly suitable for use in engines in marine and stationary applications, as well as in locomotives. Weighing only 0.04 kg, the hexagon bolt offers an optimal combination of lightness and stability for your needs.Suitable for MAN D EnginesOur hexagon bolt is designed to fit MAN D engines, ensuring a reliable connection. Rely on the precision and functionality that only OEM spare parts can provide. The quality of this product ensures that your engine operates efficiently and reliably.
SCREW/BOLT - 81904900723 suitable for MAN D engines
Optimal Screw for Engine UseDiscover our screw with the comparison number 81904900723, which has been specifically designed to provide reliable performance. This OEM replacement part is suitable for MAN D engines and offers the highest quality and fit.Perfect Fit for MAN D EnginesOur screw is compatible with various MAN D engines and belongs to the article group of screws. The comparison number 81904900723 allows for easy identification, so you can quickly find the right OEM replacement part. Rely on a product that meets high standards.
PAN-HEAD SCREW - 81904900720 suitable for MAN D engines
Quality and Precision: Pan-head ScrewDiscover the pan-head screw with comparison number 81904900720, an essential OEM spare part for your engines. Weighing only 0.005 kg, this product provides a reliable connection in engine construction. Its optimal properties make it an indispensable element in the world of spare parts.Optimal Performance for MAN D EnginesOur pan-head screw is suitable for MAN D engines and ensures that your machines run smoothly. Whether in marine or stationary applications, this spare part supports the performance of your engines and ensures longevity.
HEX SHOULDER STUD - 81904900717 suitable for MAN D engines
Hex Shoulder Stud for MAN D Engines The hex shoulder stud with the part number 81904900717 is an essential OEM replacement part, suitable for MAN D engines. This stud ensures the reliable function of your machines in both maritime and stationary applications. Weighing only 0.04 kg, it combines stability and durability, making it ideally suited for demanding operating conditions.
What are bolts and screws used for in engine systems?
A bolt and screw is used to fasten components under mechanical stress. This includes cylinder heads, pumps, intake manifolds, mounts, and brackets. Engine bolt assemblies require high tensile strength and precise thread profiles to prevent loosening under load. In marine settings, bolts marine configurations include additional corrosion protection through zinc coatings, stainless alloys, or composite heads. Whether for permanent fastening or removable joints, motor screws and bolts form the basis of structural integrity in all engine types.
Function and benefits of bolts and screws in engines
- Secure static and dynamic connections across engine assemblies
- Resist vibration, pressure, and thermal expansion
- Support torque retention and load distribution
- Enable safe disassembly for maintenance and inspection
- Allow modular engine construction with standard sizes
In both land-based and marine power units, engine screws and motor bolt types are selected for load class, material strength, and thread pitch. Using the right bolt and screw combination reduces failure risks and simplifies service procedures.
Types and materials of marine and engine fasteners
- Hex head and flange bolts for structural engine joints
- Socket head motor screws for precision components
- Thread-locking marine screws for hull or motor mounts
- High-strength engine bolt sets with graded coatings
- Marine bolt systems with stainless steel or brass
Bolts marine assemblies often use A4 stainless or Duplex steel, ensuring protection against seawater and galvanic reactions. Motor screws in enclosed spaces may use black oxide or phosphate finishes for corrosion protection and ease of removal. Material selection depends on torque level, accessibility, and contact with fluids or chemicals.
Compatibility and sourcing
We offer fastening solutions suitable for MTU, Deutz, MAN, Volvo Penta, and MWM. Whether you're rebuilding a turbo mount, re-securing an exhaust manifold, or replacing critical head bolts, our bolt and screw range fits a wide variety of marine and industrial engines. We stock bolts by dimension, thread, material, and application group.
Thanks to our well-equipped warehouse and fast delivery options, we offer short lead times and quick availability for both standard and application-specific fasteners.
Use cases in industrial and marine applications
Marine screws are often used for water-cooled exhaust, hull penetrations, and engine bed mounting. Motor bolt sets are required for rotating assemblies and timing covers. Across applications, the right engine bolt and screw setup ensures alignment under thermal expansion and torque loading. For boats, hose adapter brackets, alternators, and gearboxes also require vibration-resistant marine bolt systems with low galling and secure locking.
Buying advantages with us
Our B2B shop provides:
- Fast worldwide shipping via DHL Express
- Material and strength class selection support
- Easy ordering for bulk or precision fasteners
We supply OEM-standard bolt and screw combinations for maintenance, repairs, or assembly upgrades. With practical kit options and single part selection, technicians can easily match specs during overhauls or engine conversions.
Related components to bolt and screw systems
Complementary items often include washers, retaining rings, thread-locking pastes, brackets, and custom spacers. These elements contribute to torque stability and fastener longevity in both mobile and stationary engines. A correct bolt and screw setup is fundamental to safe operation.
Frequently asked questions about bolts and screws
What is a screw?
A screw is a threaded fastener designed to be inserted into material or a pre-threaded hole to hold components together.
What is the difference between a bolt and a screw?
A bolt typically works with a nut and is used through unthreaded holes, while a screw forms its own thread or fits into a tapped hole.