Socket Head Cap Screws
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When heavy industrial machinery vibrates or shifts under pressure, standard bolts can easily rattle loose, stretch, or snap. This loosening damages moving parts, causes unexpected equipment breakdowns, and leads to expensive maintenance repairs. Sunmach manufactures high-quality Stainless Steel Socket Head Cap Screws and heavy-duty Duplex Socket Head Cap Screws engineered to stay locked tight in the most demanding high-stress environments. Built with a perfect, snug fit and a cylindrical head profile, these specialized fasteners sit flush inside counterbored machinery components to spread out clamping forces evenly so they never slide out of place, strip their threads, or lose their grip. To ensure complete safety on every project, we manufacture our entire line of high-integrity hardware using only top-grade, pure metals from the world’s most trusted suppliers. We offer a wide selection of materials, from cost-effective Stainless Steel Socket Head Cap Screws built for long-term environmental durability and washdown protection, to heavy-duty Duplex Socket Head Cap Screws that deliver twice the yield strength of standard stainless steel. Every production batch is thoroughly tested in our quality-control labs to ensure it can handle extreme pressure, constant mechanical shaking, and harsh chemical exposure without failing, providing a safe, worry-free lifespan of up to 50 years.
Socket Head Cap Screws
Sunmach is one of the leading global manufacturer and supplier of Standard & Custom made Premium Nickel Alloys Socket 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 Socket 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 Socket 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 Socket Head Cap Screws Specifications
Using Advanced Hot Forming Technology, Our Nickel Alloys Socket Head Cap Screws are manufactured in various specifications including DIN, ISO, ANSI and IS standard in nominal diameters ranging from 1/4” to 2.5” (M6 to M64). We provide Socket Head Cap Screws in both Imperial and metric sizes to accommodate diverse application needs. Our Nickel Alloys Socket Head Cap Screws are specially engineered to withstand high temperature and high-pressure, ensuring superior strength and reliability.
Nickel Alloy Socket 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 M64 |
| Imperial : | 1/4" to 2.5" |
| MOQ : | 1 Piece & Above |
| Certification : | EN 10204 3.1, EN 10204 3.2 (On Demand) |
Specification
| Bolt | DIN | ISO | ANSI | IS |
|---|---|---|---|---|
| Socket Head Cap Screw | 931 | 4014 | B18.2.1 | 1364 |
Dimensions - Imperial
Dimensions - Metric
Frequently Asked Questions
Common questions about Sunmach Duplex Socket Head Cap Screws
They are used for precision fastening in confined spaces or low-profile assemblies where standard hex head bolts cannot fit or be easily accessed with standard wrenches. Typical applications include aerospace structures, subsea instrumentation, semiconductor cleanroom assemblies, and high-pressure chemical pump enclosures where space is limited but high clamping force is required.
Standard 316L Stainless Steel has lower yield strength and is highly susceptible to crevice corrosion underneath bolt heads and inside Hex Socket cavities when exposed to stagnant saltwater. Duplex 2205 Socket Head Cap Screws provide twice the yield strength and outstanding resistance to chloride-induced pitting, allowing engineers to safely downsize fastener sizes while improving safety margins.
Socket Head Cap Screws feature a cylindrical head with a recessed hexagonal drive (socket cavity) and are installed using a hex key (Allen wrench). This design allows the fastener head to sit flush with or below the surface of the components. Hex Head Cap Screws have a six-sided hexagonal head driven from the outside with a standard socket or wrench, requiring more clearance around the fastener head.
Because Duplex 2205 is a high-strength material, these screws are often tightened to high torque values. A socket cavity that is too loose will cause the hex key to slip and strip the socket walls during installation. A cavity that is too tight will prevent the tool from seating fully. Maintaining a strict tolerance ensures perfect tool engagement and repeatable, safe torque transmission.
Yes, because they are manufactured from high-yield Duplex 2205 without sacrificial locking elements, they can be reused multiple times. However, before re-installation, the socket cavity must be inspected for wear or rounding and the threads must be checked for signs of micro-galling or stripping. If any thread or socket wear is found, the screw should be replaced to preserve joint safety margins.