Perhaps the most recurring question you hear in the fastener manufacturing industry is whether a coarse thread bolt is better than a fine thread bolt. It’s a legitimate question, considering that coarse threads are stronger and have an overall greater resistance to cross-threading and stripping, while the fine thread fasteners have a slightly larger tensile […]

Coarsevsfine threadchart

Techniks is proud to offer the Pinzbohr modular boring system, world famous for rigidity, ease of use, and years of reliable performance. Featuring a boring range from 0.314” to 40.157”, the Pinzbohr system has the range to meet about any application. The use of extensions and reducers allow the configuration to address of long-reach applications. BohrSTAR kits are a convenient all-in-one-box solution for shops needing the flexibility to produce a range of bore diameters. BohrSTAR kits are available in bore ranges of 0.314” to 8.27”.

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Prosandcons ofcoarse and fine thread

A typical coarse thread fastener of 3/8-16 inch can be installed almost 70% faster than its 3/8-24 fine thread counterpart, thus saving you time, money and energy. This feature makes them desirable fastening solutions for industries and applications where quick assembly and disassembly is required. Moreover, if the bolt gets damaged or is corroded, then it would be easier to replace, thus ensuring your equipment will be operational again in no time.

Twin-slide Roughing Heads feature SpeedSET, the ability to adjust both slides are the time saving time and money over systems that require adjusting each slide independently. Pinzbohr Roughing Heads also feature SafetySET, a clutching mechanism that protects the adjustment screw from damage if adjusted while the locking screw is tightened saving the expense of a costly repair.

Fine threadvscoarse threadbolts

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Fine threadvscoarse threadstrength

Pinzbohr Finishing Heads feature AccuSET, a spring-loaded slide assembly that maintains position when the locking screw is loosened enabling fast, accurate fine diameter adjustments. Roughing and Finishing heads are available in 75° and 90° lead angles for both through bores and blind bores. Ultra-fine Finish Heads have an 11° relief angle to produce ultra-smooth surface finishes.

Coarsevsfine threadwood screws

In applications where the length of the thread engagement is short, coarse threads are preferable due to their higher resistance to stripping. Innately, coarse threads have a greater height and hence, a larger volume of material between each lining compared to their fine counterparts. The extra height is typically around 33% for coarse threads, meaning there's considerably more material to resist stripping.

Perhaps the most recurring question you hear in the fastener manufacturing industry is whether a coarse thread bolt is better than a fine thread bolt. It's a legitimate question, considering that coarse threads are stronger and have an overall greater resistance to cross-threading and stripping, while the fine thread fasteners have a slightly larger tensile stress area. The short answer is that for general industrial applications, coarse thread bolts present several advantages over fine threads.

MATERIAL. SPEED. END MILL DIAMETER FEED PER TOOTH (INCHES). (SFM). UP TO 1/4. UP TO 1/2. UP TO 1. ALUMINUM/ALUMINUM ALLOYS. 600 – 1300 .0002-.002.

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Difference between fine thread and coarse threadfor steel

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Coarse Threadchart

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Difference between fine thread and coarse threadchart

The only situation when fine thread bolts are preferable to coarse is in applications that require a larger tensile stress area. Other potential circumstances when using fine thread bolts makes sense include:

Because the gaps obtained in a fine thread bolt are shallower, it means that they are more likely to be distorted by a nick of a certain dimension. Nicking refers to the misalignments found in threads that can appear as a result of the manufacturing process or during transportation. While they can develop all along the surface of the bolt, the nicks on the first thread are usually the most problematic since they will make it increasingly difficult to properly fasten the bolt.

These boring bars feature a carbide shank, which is more rigid than tool steel, and offers higher strength and durability.

In the event that you need stainless steel fasteners for your application, then opt for coarse threads, as their chances to gall are lower. Galling occurs due to abnormal surface friction and the closer the fit between the mating threads, the more welded the nut will be. It is necessary to mention that minor galling can be very hard to detect sometimes. To put it simply, while a galled bolt has passed all quality tests and inspections, it will still not be able to function properly.

The MacroBOHR large diameter boring system is available for roughing and finish boring of diameters from 8.661” to 40.157”. The MacroBOHR system can also be configured for external boring to achieve tight tolerance O.D. surfaces.

Chamfering is making a small cut, usually at a 45 degree angle, to remove a 90 degree edge. Chamfering is used in woodworking, in glass cutting,

As an industry standard, the plating needed for course thread bolts is 20% higher than the one required by fine threads. In addition, due to their distinct manufacturing processes, the plating on fine threads tends to have more gagging and presents more assembly problems compared to coarse threads.