Flat Countersunk Head Cap Screw
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Sunmach's premium Flat Countersunk Head Cap Screws are engineered to provide a seamless, completely flush finish in critical applications such as Aerospace Aerodynamic surfaces, Pharmaceutical cleanroom equipment and compact subsea assemblies where any protruding fastener head could compromise drag profiles, hygiene, or space constraints. Manufactured to strict geometric Standards, Utilizing a balanced dual-phase microstructure, these screws combine high mechanical tensile strength with essential ductility, while the specialized alloy chemistry yields a Pitting Resistance Equivalent Number that resists aggressive localized pitting and crevice corrosion on the exposed head surface. Fabricated within a fully ISO 9001:2015 certified facility, these screws strictly comply with major international specifications, including ISO 10642, DIN 7991 and ASTM design Standards. To guarantee maximum structural integrity in demanding environments, every production lot undergoes a comprehensive quality validation protocol consisting of dimensional head-angle audits, socket depth verification, tensile strength testing, core hardness checks and corrosion resistance evaluations. Sunmach enforces material traceability from certified premium global mills to the finished components, delivering every batch with complete documentation packs, including formal Certificates of Conformance and premium EN 10204 3.1 Mill Test Certificates.
Flat Countersunk Head Cap Screws
Sunmach is one of the leading global manufacturer and supplier of Standard & Custom made Premium Nickel Alloys Flat Countersunk Head Cap Screws engineered for the most critical industrial applications. We are an ISO 9001:2015 certified company, demonstrating our commitment to rigorous quality standards and consistent product excellence to deliver the best of the Nickel Alloys & Special Steel Fasteners.
Nickel Alloys Flat Countersunk Head Cap Screws are manufactured by us from a range of high-performance & exotic materials such as : Hastelloy® C-276, Hastelloy® C-22, Hastelloy® B-2, Monel® 400, Monel® K-500, Inconel® 600, Inconel® 625, Inconel® 718, Titanium Grade 2, Titanium Grade 5, Titanium Grade 7, Duplex S31803, Duplex S32205, Super Duplex S32750 to various Stainless Steel grades of SS 304L, SS 316L SS 310, SS 310H, SS 347H, etc followed by Special Stainless Steel Grades such as 904L Stainless Steel, UNS N08904, DIN EN1.4539 Nitronic® 50, Nitronic® 60, UNS S21800, DIN EN, 254 SMO, UNS S31254, DIN EN 1.454, A4-80 Stainless Steel etc.
Sunmach’s extensive manufacturing capabilities and In-Stock Genuine & Authentic Raw Material availability allows us to support demanding industrial requirements with durable, corrosion-resistant, heat resistant & reliable Nickel Alloys Flat Countersunk Head Cap Screws delivered dot in time to any corner of the world, supported by all required test certificates and with 100% traceability.
Nickel Alloy Flat Countersunk Head Cap Screws Specifications
Using Advanced Hot Forming Technology, Our Nickel Alloys Flat Countersunk Head Cap Screws are manufactured in various specifications including DIN, ISO, ANSI and IS standard in nominal diameters ranging from 1/4” to 1.5” (M6 to M40). We provide Flat Countersunk Head Cap Screws in both Imperial and metric sizes to accommodate diverse application needs. Our Nickel Alloys Flat Countersunk Head Cap Screws are specially engineered to withstand high temperature and high-pressure, ensuring superior strength and reliability.
Nickel Alloy Flat Countersunk Head Cap Screws Application Industries
Sunmach serves a diverse range of markets including Chemical Processing, Semiconductor, Power Generation, Aerospace, Oil & Gas, Pharmaceutical, Food & Beverage, Marine, Pulp & Paper, Petrochemical & Refining, Air Pollution Control and Water Treatment.
Sizes
| Metric : | M6 to M40 |
| Imperial : | 1/4" to 1.5" |
| MOQ : | 1 Piece & Above |
| Certification : | EN 10204 3.1, EN 10204 3.2 (On Demand) |
Specification
| Bolt | DIN | ISO | ANSI | IS |
|---|---|---|---|---|
| Flat Countersunk Head Cap Screw | 931 | 4014 | B18.2.1 | 1364 |
Dimensions - Imperial
Dimensions - Metric
Frequently Asked Questions
Common questions about Sunmach Stainless Steel Flat Countersunk Head Cap Screws
Stainless Steel Flat Countersunk Head Cap Screws are specified for high-performance assemblies requiring flush-surface fastening, such as aerospace wing skins, subsea hulls, and pharmaceutical cleanroom equipment. Their tapered head profile sits level with the mating material to eliminate external fluid drag, prevent mechanical interference, and eliminate fluid pockets.
Stainless Steel Flat Countersunk Head Cap Screws feature a tapered head that embeds flush into the material to eliminate external turbulence and spatial limitations in compact areas, minimizing external interference while maintaining high torque transmission through a precision internal hex drive.
Stainless Steel Flat Countersunk Head Cap Screws processed in lightweight titanium provide extreme weight savings for aerospace structural components operating at moderate temperatures. For extreme-heat zones, high-temperature nickel superalloys are the required choice to prevent thermal stretching and scaling.
Strict head angle tolerances are critical because any angular deviation will cause the screw head to sit unevenly or protrude above the countersunk pocket. This misalignment concentrates clamping stresses on a small contact area, triggering accelerated fatigue cracking and eventual head separation under dynamic loads.
These screws are shipped with complete material traceability documentation to verify physical load limits, core hardness, and chemical composition. For severe offshore or sour-gas applications, specialized compliance certifications can also be provided upon request.