Audited Supplier
LS081250030
Carbon Steel
Double-End Bolt
Common Bolt
Thread Head
DIN, ANSI, GB, JIS, BSW, GOST, as The Customer Required
8.8
Machinery, Chemical Industry, Environmental, Building, as The Customer Required
Color-Zinc Plated
8
1.25
30mm
Single Thread
Natural, Black Coating, Zinc
S25c, 35, 45
Single
26g
8.8
Cold Heading
Sample Free, Freight Is on Your Own Account
as the customer required
Carton
M8
China
7318151090
Product Description
Countersunk bolts are a type of fastener designed to be flush with the surface of the material they are fastened to. Here's a detailed breakdown of their classification, characteristics, and application range.
Classification:Countersunk bolts can be classified based on various factors such as head shape, material, and drive type. Here are some common classifications:
Head Shape:
Flat Head: The most common type, where the head is conical and allows the bolt to be flush with the surface.
Raised Countersunk Head: Similar to a flat head but with a slightly raised area around the edge.
Pan Head Countersunk: Features a rounded, slightly domed head that still allows the bolt to sit flush.
Drive Type:
Phillips: Cross-shaped drive for better grip and reduced cam-out.
Slotted: A single slot for a flat-head screwdriver.
Hex: Requires an Allen wrench or hex key.
Torx: Star-shaped drive for increased torque and resistance to stripping.
Material:
Steel: Often used for general-purpose applications, can be coated for corrosion resistance.
Stainless Steel: Offers high corrosion resistance, suitable for harsh environments.
Aluminum: Lightweight and resistant to corrosion, often used in aerospace applications.
Brass: Offers good corrosion resistance and is often used in decorative applications.
Thread Type:
Metric: Common in Europe and Asia, designated by millimeter measurements.
Unified Thread Standard (UTS): Common in the U.S., using inch measurements.
Characteristics:
Head Design: The countersunk head allows the bolt to sit flush with or below the surface, which is crucial for maintaining a smooth, even surface.
Drive Type: Varies depending on the required torque and ease of installation. Some types are more resistant to stripping or tampering.
Material Strength: Depends on the material of the bolt. Steel bolts are strong and durable, while aluminum bolts are lighter but may not be as strong.
Finish and Coating: Can include options like zinc plating, anodizing, or coating for corrosion resistance and aesthetic purposes.
Application:
Countersunk bolts are used in a variety of applications where a flush surface is needed.
Aerospace: For aircraft components where aerodynamic efficiency and smooth surfaces are critical.
Automotive: In car manufacturing and repairs, especially where smooth surfaces are necessary for safety or aesthetics.
Electronics: For securing electronic components where a flush surface can prevent interference or damage.
Construction: In applications where a flush surface is necessary to prevent injury or for aesthetic reasons.
Furniture and Cabinetry: To ensure a smooth, clean appearance on visible surfaces.
Marine: Stainless steel countersunk bolts are used in marine environments due to their resistance to corrosion.
In summary, countersunk bolts are versatile fasteners with specific design features that make them ideal for applications requiring a flush surface. Their classification by head shape, drive type, material, and thread type ensures they can meet a wide range of functional and aesthetic needs.
We produce all types of standard or non-standard thread screws according to customer's request.Detailed as following table:
| Specification Table of Thread Screw | |||||
| Standard | Size | Pitch of thread (mm) | d(mm) | Wire Diameter ±0.02mm | |
| Max | Min | ||||
| Chinese National Standard Coarse Thread 60° | M5 | 0.80 | 4.98 | 4.83 | 4.30 |
| M6 | 1.00 | 5.97 | 5.82 | 5.18 | |
| M7 | 1.00 | 6.97 | 6.82 | 6.18 | |
| M8 | 1.25 | 7.96 | 7.79 | 7.02 | |
| M9 | 1.25 | 8.96 | 8.79 | 8.01 | |
| M10 | 1.50 | 9.96 | 9.77 | 8.84 | |
| M11 | 1.50 | 10.97 | 10.73 | 9.84 | |
| M12 | 1.75 | 11.95 | 11.76 | 10.7 | |
| M14 | 2.00 | 13.95 | 13.74 | 12.5 | |
| M16 | 2.00 | 15.95 | 15.74 | 14.5 | |
| M18 | 2.50 | 17.95 | 17.71 | 16.20 | |
| M20 | 2.50 | 19.95 | 19.71 | 18.2 | |
| Chinese National Standard Fine Thread 60° | M5 | 0.50 | 4.97 | 4.86 | 4.57 |
| M6 | 0.75 | 5.97 | 5.85 | 5.41 | |
| M7 | 0.75 | 6.97 | 6.85 | 6.41 | |
| M8 | 1.00 | 7.97 | 7.83 | 7.24 | |
| M9 | 1.00 | 8.97 | 8.83 | 8.24 | |
| M10 | 1.00 | 9.97 | 9.82 | 9.23 | |
| M10 | 1.25 | 9.96 | 9.81 | 9.07 | |
| M12 | 1.25 | 11.97 | 11.76 | 11.07 | |
| M12 | 1.50 | 11.96 | 11.79 | 10.89 | |
| M14 | 1.50 | 13.96 | 13.79 | 12.89 | |
| M16 | 1.50 | 15.96 | 15.79 | 14.89 | |
| M18 | 1.50 | 17.95 | 17.73 | 16.86 | |
| M20 | 1.50 | 19.95 | 19.65 | 18.85 | |
| Specification Table of Thread Screw | |||||
| Standard | Size | Thread per inch | d(mm) | Wire Diameter ±0.02mm | |
| Max | Min | ||||
| British Standard Whitworth Thread (Coarse) 55° | 1/8 | 40 | 3.145 | 3.03 | 2.70 |
| 5/32 | 32 | 3.945 | 3.795 | 3.38 | |
| 3/16 | 24 | 4.732 | 4.592 | 4.00 | |
| 1/4 | 20 | 6.32 | 6.165 | 5.45 | |
| 5/16 | 18 | 7.905 | 7.737 | 6.94 | |
| 3/8 | 16 | 9.49 | 9.312 | 8.4 | |
| 7/16 | 14 | 11.2 | 10.88 | 9.84 | |
| 1/2 | 12 | 12.66 | 12.46 | 11.22 | |
| 9/16 | 12 | 14.25 | 14.04 | 12.81 | |
| 5/8 | 11 | 15.83 | 15.61 | 14.27 | |
| Unified Coarse Pitch Thread ( American Standard) 60° | 4# | 40 | 2.824 | 2.695 | 2.37 |
| 5# | 40 | 3.154 | 3.026 | 2.69 | |
| 6# | 32 | 3.484 | 3.333 | 2.91 | |
| 8# | 32 | 4.142 | 3.991 | 3.57 | |
| 10# | 24 | 4.80 | 4.618 | 4.05 | |
| 12# | 24 | 5.461 | 5.279 | 4.7 | |
| 1/4 | 20 | 6.322 | 6.117 | 5.45 | |
| 5/16 | 18 | 7.907 | 7.687 | 6.93 | |
| 3/8 | 16 | 9.491 | 9.254 | 8.40 | |
| 7/16 | 14 | 11.08 | 10.82 | 9.83 | |
| 1/2 | 13 | 12.66 | 12.39 | 11.32 | |
| 9/16 | 12 | 14.25 | 13.96 | 12.8 | |
| 5/8 | 11 | 15.83 | 15.53 | 14.26 | |
| Unified Fine Pitch Thread ( American Standard) 60° | 4# | 48 | 2.877 | 2.713 | 2.44 |
| 5# | 44 | 3.157 | 3.036 | 2.73 | |
| 6# | 40 | 3.484 | 3.356 | 3.02 | |
| 8# | 36 | 4.145 | 4.006 | 3.63 | |
| 10# | 32 | 4.803 | 4.651 | 4.23 | |
| 12# | 28 | 5.461 | 5.296 | 4.81 | |
| 1/4 | 28 | 6.324 | 6.16 | 5.68 | |
| 5/16 | 24 | 7.909 | 7.727 | 7.16 | |
| 3/8 | 24 | 9.497 | 9.315 | 8.74 | |
| 7/16 | 20 | 11.08 | 10.87 | 10.18 | |
| 1/2 | 20 | 12.67 | 12.46 | 11.76 | |
| 9/16 | 18 | 14.25 | 14.03 | 13.25 | |
| 5/8 | 18 | 15.83 | 15.62 | 14.83 | |
| Advanced Planning | Process Control | Quality Issue Feedback |
| ·Multi-functional project team ·Build up standard tree,do the analysis and training ·DFMEA ·4 stage project review, quality gate ·PFMEA ·Visualized WI | ·First and final piece100% inspection. ·Combine self-inspect and patrol inspect. ·Regular inspection on fixture and gauges. ·Upper andlower process error prevention control ·5M1E management | ·Quick feedback, arrive sitewithin 10 minutes ·Define interim and containment action within 4hours ·Daily quick response meeting ·8D ·6 Sigma ·Actions follow-upvalidation ·Share to similarproducts ·Record into failure mode database |
Q1: Are you a manufacturer?
Yes, we have been in manufacturing and providing excellent linear motion partsfor customers more than 20years.
Q2: How long could you prepare samples?
Ans:Normally 1days if we have the sample onhand.lf customized one. about a week around.
Q3: How about batch order production?
Ans: Normally 30days or so for one container
Q4: Do you inspect the finished products?
Ans:Yes, we will do inspection according to lsO standard and ruled by our QCstaff.
Q5: How do you ship the goods?
Ans: By sea, by air by truck or by courier(UPSDHLFedexTNT etc.)
Q6: What advantage do you have?
Ans:1.We have professional engineers,customers can expect the best possibleadvice and support.
2.Related responsible team to answer all your questions and follow-upprocess for you and do update in time.
3.Strict and standard process control according to Quality ManagementSystem.4.Documents support on products, we have strong technical data sheet tosupport our products, which could make you easier to know our products.
