17‑4 PH Fasteners Manufacturer: RAYCHIN LIMITED – High Strength, Full Traceability, All Conditions

RAYCHIN LIMITED is your dedicated global partner for 17‑4 PH stainless steel fasteners. With over two decades of specialized experience in high‑strength alloy fastener engineering and manufacturing, we supply the complete portfolio of 17‑4 PH bolts, studs, nuts, screws and custom parts. From standard hex bolts to fully traceable aerospace studs, we offer every heat treatment condition, full certification, and the size range you need—all from a single, factory‑direct source.

1. Complete 17‑4 PH Fastener Product Range

Our manufacturing scope covers every standard product form, with custom geometry readily available:

• Hex head bolts – partial and full thread, ASME B18.2.1, DIN 931/933, ISO 4014.
• Double‑end studs & tap‑end studs – ASME B16.5, DIN 976, customer‑specified thread lengths.
• Fully threaded studs / continuous rods – ASME B18.31.2, with chamfered ends.
• Socket head cap screws – ASME B18.3, for confined spaces and high clamping force.
• 12‑point flange bolts – aerospace and high‑pressure flange style, compact wrenching envelope.
• Heavy hex nuts – ASME B18.2.2, DIN 934, proof‑load matched to the bolt strength.
• Self‑locking nuts – all‑metal prevailing torque type for vibration resistance.
• Flat washers & spring lock washers – ASME B18.22.1, DIN 125, DIN 127.
• Clevis pins, cotter pins, dowel pins – machined from certified 17‑4 PH bar.

Diameter range: M6 – M64 (metric), 1/4″ – 2‑1/2″ (imperial). Longer lengths and larger diameters are available on request. We stock common sizes in multiple conditions for rapid shipment.

2. All Heat Treatment Conditions – One Source

Different applications demand different balances of strength and toughness. RAYCHIN manufactures 17‑4 PH fasteners in every standard condition, with in‑house vacuum aging that guarantees uniformity and repeatability:

Double‑aging processes beyond the standard H1150D can also be accommodated for specialized requirements. Our team will help you select the optimum condition for your pressure rating, temperature, and environmental conditions.

3. Standards, Certifications & Documentation

RAYCHIN's 17‑4 PH fasteners are manufactured under a rigorous quality system to meet the most demanding international specifications:

• ASTM A564 Type 630 – Standard specification for hot‑rolled and cold‑finished age‑hardened 17‑4 PH bars and shapes.
• ASTM F593 – Standard for stainless steel bolts, hex cap screws, and studs; we certify to this for commercial and industrial fasteners.
• AMS 5643 – Aerospace‑grade 17‑4 PH bar and fastener stock, with tighter chemistry and higher cleanliness.
• NACE MR0175 / ISO 15156 – Fully compliant H1150D fasteners with documented hardness ≤35 HRC for sour oil and gas service.
• ISO 9001:2015 – Certified quality management system.
• PED 2014/68/EU – Annex 1 Section 4.3 for pressure equipment fasteners.
• NADCAP Heat Treatment – Available for aerospace and defense programs.

Standard documentation with every shipment: EN 10204 Type 3.1 material certificate (Type 3.2 with third‑party witness on request), Positive Material Identification (PMI) report, mechanical properties test report, and certificate of conformance. For aerospace orders, we include AS9102 First Article Inspection Reports and NDT reports (FPI/MPI).

4. In‑House Manufacturing & Quality Assurance

We do not simply resell fasteners made by others. RAYCHIN controls the entire production process in our own facility:

• Multi‑station cold‑forming – produces blanks with excellent grain flow and repeatable dimensions.
• CNC thread rolling – after heat treatment, producing fatigue‑resistant, smooth threads that resist galling.
• Vacuum aging furnaces – digitally controlled with full traceability of time and temperature for every heat treat lot.
• Optical Emission Spectrometer (OES) – 100% positive material identification on incoming raw material and finished fasteners.
• Universal tensile tester – yield, ultimate, elongation, and reduction of area tested per lot.
• Rockwell & Brinell hardness testers – 100% verification, critical for NACE compliance.
• Metallurgical microscope – grain size, microstructure, and inclusion rating.
• Coordinate Measuring Machine (CMM) – precision dimensional verification.

5. Industries Served by RAYCHIN 17‑4 PH Fasteners

• Oil & Gas Valves and Wellheads – NACE H1150D studs and nuts for API 6A gate valves, choke bodies, and Christmas trees.
• Aerospace Structures and Engine Accessories – AMS 5643 fasteners for landing gear, airframe, hydraulic systems, and accessory gearboxes.
• High‑Pressure Pumps and Compressors – high‑strength bolting for reciprocating and centrifugal machines.
• Medical Devices and Surgical Instruments – corrosion‑resistant, sterilizable fasteners with full biocompatibility documentation when required.
• General High‑Strength Industrial Fastening – any application requiring corrosion resistance and tensile strength beyond A2‑70 or A4‑80 stainless steel bolts.

6. Custom Manufacturing: Beyond the Catalog

Your application may require a fastener that doesn't exist in any catalog—a stepped stud for a subsea valve actuator, a reduced‑shank body‑bound bolt for an aircraft hinge, or a flanged hex bolt with a non‑standard under‑head radius. RAYCHIN's engineering team collaborates directly with your designers to manufacture these custom parts. We accept CAD files in all common formats, and our CNC machining and turning centers can produce components from prototype quantities to full production runs with the same certified quality.