Set screws appear with a variety of tip (point) types. The different shaped tips have different properties that engineers can utilize. If an engineer were to use a detent to ensure proper nesting of the screw, they might choose to use a cone point type of screw. One might often need to use a flat point when the screw must press perfectly flat against a surface. The most common type is the cup point. This type works well because the surface is rounded so that a small surface area is in contact, but it does not have extremely high stress at one point like that of a cone point. Durability studies show that the cup point offers superior resistance to wear while maintaining a strong grip. Knurled cup points offer the added advantage of a locking action (similar to that of a serrated lock washer) that prevents the screws from working loose in high-vibration applications.

Common points include the following:

• Flat point

• Domed point

• Cone point

• Cup point

• Extended point (pilot point, dog point)

• Knurled cup point

Knurled cup point

Knurl point screws are generally used to secure one object within another. The serrated ridge on the knurl cup set screw helps reduce loosening due to vibration. The knurled point combines digging action of the cup point with counter-clockwise locking knurls that have a ratchet-locking action which helps resist loosening, even under the most severe vibrations.

Knurl point set screws should not be reused because the cutting edges of the knurls are deflected when tightened. During removal, the cutting edges are torn and no longer have full strength to resist unscrewing. ISO standard for Knurled cup point set screw is ISO 4029.

Set screws are made with a variety of drive styles, including the following:

• Straight slot

• Hex socket

• Square socket

• External hex

• External square

• Bristol spline

Set screws common points

Machine Screws

Set Screws in Special Alloys | Cup Point, Cone Point & Custom Set Screws | RAYCHIN Manufacturer

RAYCHIN manufactures precision set screws in 25+ exotic alloys: 17-4 PH, Inconel 718, MP35N, Hastelloy, Titanium, A286 & more. Cup point, cone point, dog point, flat point, oval point. ASME B18.3, DIN 913-916, ISO 4026-4029 compliant. Custom OEM set screws for aerospace, automotive & industrial applications.

Set Screws: Precision Fasteners for Secure Positional Holding

RAYCHIN is a leading manufacturer of set screws, also known as grub screws or blind screws — fully threaded fasteners designed without a head to secure rotating components such as gears, pulleys, collars, and bearings onto shafts. Unlike conventional bolts, set screws exert clamping force through their tip, which contacts the mating surface to prevent relative motion. These critical components are essential in power transmission, automotive systems, aerospace actuators, robotics, machine tools, and precision instrumentation.

We engineer set screws from over 25 advanced alloys, ensuring reliable performance in high-temperature, corrosive, vacuum, and high-wear environments. Our set screws are manufactured to exacting ASME, DIN, ISO, and JIS standards with complete material certification, full traceability, and a wide range of point styles and drive configurations.

Set Screw Point Styles & Classifications

1. Standard Point Styles (ASME B18.3, DIN 913-916, ISO 4026-4029):

2. Drive Types:

• Hex Socket Set Screws (Allen): ASME B18.3, DIN 916 — Most common; high torque capability.

• Slotted Headless Set Screws: DIN 913, ISO 4026 — Traditional drive for light-duty applications.

• Spline Drive Set Screws: Enhanced torque transfer for aerospace applications.

• Torx® Drive Set Screws: Superior torque and reduced cam-out.

• Custom Drive Configurations: Manufactured to OEM specifications.

3. Special Application Set Screws:

• Knurled Cup Point Set Screws: Enhanced grip for vibration resistance.

• Nylon Tip Set Screws: Non-marring plastic tip for soft or finished surfaces.

• Self-Locking Set Screws: With nylon patch or pellet for vibration-proof locking.

• High-Temperature Set Screws: For turbine and exhaust applications.

• Corrosion-Resistant Set Screws: For chemical and marine environments.

• Custom Set Screws: Manufactured to your exact OEM drawings with unique point geometries, lengths, diameters, thread forms, and material grades.

Full Material Portfolio with International Standard Designations

We produce set screws in the following comprehensive range of high-performance materials:

1. Precipitation-Hardening Stainless Steels:

• 17-4 PH (UNS S17400): ASTM A564 Type 630, AMS 5643, DIN 1.4542 — H900, H1025, H1150 tempers. Excellent combination of high strength (to 180 ksi) and corrosion resistance. *Keywords: 17-4 PH set screws, 17-4 PH cup point set screws.*

• PH 13-8 Mo (UNS S13800): ASTM A564 Type 625, AMS 5629 — Superior strength, toughness, and stress corrosion cracking resistance. *Keywords: PH 13-8 Mo set screws.*

2. Nickel-Based Superalloys:

Inconel® Alloys:

• Inconel 600 (UNS N06600): ASTM B166, AMS 5665 — General purpose high-temperature alloy with oxidation and corrosion resistance to 2000°F.

• Inconel 625 (UNS N06625): ASTM B446, AMS 5666 — Excellent resistance to pitting, crevice corrosion, and high-temperature oxidation.

• Inconel 718 (UNS N07718): AMS 5663, ASTM B637 — High-strength alloy with exceptional creep rupture strength up to 1300°F. Keywords: Inconel 718 set screws, Inconel 625 cup point set screws.

Monel® Alloys:

• Monel 400 (UNS N04400): ASTM B164, AMS 4675 — Superior resistance to seawater, steam, and caustic environments.

• Monel K500 (UNS N05500): ASTM B865, AMS 4676 — Age-hardenable version offering increased strength and hardness. Keywords: Monel set screws, Monel K500 set screws.

Hastelloy® Alloys:

• Hastelloy C276 (UNS N10276): ASTM B574, AMS 5754 — Excellent resistance to wide range of corrosive chemicals including strong oxidizers and reducing agents.

• Hastelloy C22 (UNS N06022): ASTM B574, AMS 5755 — Superior resistance to oxidizing media and localized corrosion.

• Hastelloy B2 (UNS N10665): ASTM B335 — Exceptional resistance to reducing acids like hydrochloric and sulfuric. Keywords: Hastelloy C276 set screws, Hastelloy C22 cup point set screws.

Incoloy® Alloys:

• Incoloy 825 (UNS N08825): ASTM B423, AMS 5870 — Excellent resistance to reducing and oxidizing acids, stress corrosion cracking.

• Incoloy 925 (UNS N09925): ASTM B805 — High-strength, age-hardenable alloy for sour gas environments. Keywords: Incoloy 825 set screws.

High-Temperature Alloys:

• Waspaloy (UNS N07001): AMS 5708, AMS 5824 — Precipitation-hardenable alloy for jet engine and gas turbine applications to 1600°F.

• Nimonic® Series:

  • Nimonic 80A (UNS N07080): BS HR 501, AMS 5842 — Creep and rupture strength up to 1500°F.

  • Nimonic 90 (UNS N07090): BS HR 502, AMS 5796 — Enhanced high-temperature properties with excellent oxidation resistance. Keywords: Waspaloy set screws, Nimonic 80A set screws.

3. Duplex & Super Duplex Stainless Steels:

• Duplex 2205 (UNS S32205/S31803): ASTM A193 B8S, EN 1.4462 — Twice the yield strength of 316 stainless with excellent chloride stress corrosion resistance. Keywords: Duplex 2205 set screws.

• Super Duplex Alloys:

  • Alloy 926 (UNS N08926): ASTM B691, EN 1.4529 — PREN >40 for severe chloride and seawater environments.

  • AL-6XN® (UNS N08367): ASTM B691, AMS 5875 — Superior pitting and crevice corrosion resistance in highly chlorinated atmospheres. *Keywords: AL-6XN set screws, Alloy 926 set screws.*

4. Titanium Alloys:

• Grade 2 Titanium (UNS R50400): ASTM B348, AMS 4921 — Excellent corrosion resistance with good formability.

• Grade 5 Titanium (Ti-6Al-4V) (UNS R56400): AMS 4928, ASTM F467 — High strength-to-weight ratio, ideal for aerospace and medical applications. Keywords: Titanium set screws, Grade 5 titanium set screws.

5. Refractory & Exotic Metals:

• Tantalum (UNS R05200): ASTM B365, AMS 7845 — Ultimate corrosion resistance in aggressive acid environments. Keywords: Tantalum set screws.

• Zirconium 702 (UNS R60702): ASTM B550, ASME SB550 — Excellent resistance to sulfuric, hydrochloric, and nitric acids. Keywords: Zirconium set screws.

• Molybdenum (UNS R03600): ASTM B387 — High temperature strength and stiffness for extreme thermal applications to 3000°F. Keywords: Molybdenum set screws.

• Tungsten: ASTM B777 — Highest density and melting point for specialized radiation shielding and high-temperature fasteners. Keywords: Tungsten set screws.

6. Specialty Stainless Steels & Nickel Alloys:

• Nitronic® Alloys:

  • Nitronic 50 (XM-19) (UNS S20910): ASTM A193 B8N — High strength, non-magnetic, excellent corrosion resistance.

  • Nitronic 60 (UNS S21800): ASTM A193 B8N — Superior wear and galling resistance; ideal for set screws requiring repeated adjustment. Keywords: Nitronic 60 set screws, Nitronic 50 set screws.

• High-Performance Stainless:

  • 254 SMO (UNS S31254): EN 1.4547, ASTM A479 — Excellent seawater and chloride resistance with high PREN value.

  • 310 Stainless Steel (UNS S31000): ASTM A276, AISI 310 — Outstanding high-temperature oxidation resistance up to 2000°F. Keywords: 254 SMO set screws, 310SS set screws.

  • Alloy 20 (Carpenter 20) (UNS N08020): ASTM B473 — Superior resistance to sulfuric acid and chloride stress corrosion. Keywords: Alloy 20 set screws.

  • Alloy 330 (UNS N08330): ASTM B536 — Excellent carburization and oxidation resistance at elevated temperatures. Keywords: Alloy 330 set screws.

7. Ultra-High-Strength Cobalt Alloys:

• MP35N (UNS R30035): AMS 5844, ASTM F562 — Ultimate tensile strength exceeding 300 ksi with exceptional toughness and corrosion resistance. Keywords: MP35N set screws.

• MP159 (AMS 5846): Advanced cobalt-nickel alloy offering high strength and creep resistance at elevated temperatures. Keywords: MP159 set screws.

8. High-Strength Aluminum & Iron-Based Alloys:

• Aluminum 7075 (UNS A97075): AMS QQ-A-225/9, ASTM B211 — Available in T6, T73, T76 tempers. High strength-to-weight ratio. Keywords: Aluminum 7075 set screws.

• A286 (UNS S66286): AMS 5731, ASTM A453 Grade 660 — Iron-based superalloy with excellent high-temperature strength and oxidation resistance to 1300°F. Keywords: A286 set screws.

9. Pure Nickel:

• Nickel 200/201 (UNS N02200/N02201): ASTM B160, ASME SB160 — High purity and excellent corrosion resistance in caustic environments. Keywords: Nickel 200 set screws.

Custom Set Screw Manufacturing & Quality Assurance

RAYCHIN provides complete custom set screw manufacturing services tailored to your exact specifications:

Manufacturing Capabilities:

• Precision CNC Machining: Swiss-style turning and multi-axis milling for complex geometries and tight tolerances (±0.01mm).

• Cold Heading: High-volume production with superior grain flow and material strength.

• Thread Rolling: Class 2A, 3A, 6g, 6h, and 4h6h precision threads with superior fatigue resistance.

• Point Grinding: Precision cup, cone, dog, flat, and oval point geometries with consistent angle and depth.

• Heat Treatment: Full in-house capabilities including solution annealing, aging, precipitation hardening, and stress relieving.

• Surface Finishing: Passivation, electropolishing, black oxide, phosphate coating, PTFE coating, silver/nickel plating, and specialized anti-galling treatments.

Quality Assurance:

• Material Certification: Complete Material Test Reports (MTRs) to EN 10204 3.1/3.2 with full traceability to melt source.

• Dimensional Inspection: CMM, optical comparator, and vision system verification to customer specifications.

• Mechanical Testing: Tensile, yield, hardness, torque, and push-out testing as required.

• Metallurgical Analysis: Microstructure examination, case depth verification, and grain size determination.

• Non-Destructive Testing: Liquid penetrant, magnetic particle, and eddy current inspection.

• Process Certification: AS9100, ISO 9001, ISO 13485, ITAR, NADCAP, and PED compliant.

Industry Applications

Engineering & Technical Support

Material Selection Assistance:
Our metallurgical engineers provide expert guidance in selecting the optimal alloy for your specific application based on:

• Operating temperature range

• Corrosive environment exposure

• Required strength and hardness

• Magnetic permeability requirements

• Coefficient of thermal expansion

• Galling and wear resistance needs

Design Optimization:
We offer complete design support including:

• Point style selection for maximum holding power

• Thread engagement calculations

• Torque specifications and preload recommendations

• Finite element analysis (FEA) for critical applications

• Prototype development and testing

Documentation & Traceability:

• Full material certification with chemical analysis and mechanical properties

• Lot-specific traceability from raw material to finished product

• First Article Inspection (FAI) per AS9102

• Certificate of Conformance (C of C)

• NDT reports as required

Why Choose RAYCHIN?

• 25+ Years of Exotic Alloy Expertise: Deep metallurgical knowledge across the full spectrum of superalloys and refractory metals.

• Complete In-House Processing: From raw material to finished, certified product — no outsourcing.

• Engineering-Driven Approach: We don't just manufacture; we engineer solutions.

• Global Standards Compliance: Products meet ASTM, ASME, DIN, ISO, JIS, BS, GB, and MIL-SPEC specifications.

• Rapid Prototyping: Quick-turn samples for design validation.

• Supply Chain Reliability: Consistent quality, competitive pricing, and on-time delivery to global markets.

• Customer Commitment: Technical consultation, responsive communication, and long-term partnership focus.

Request a Quote for Set Screws

Contact RAYCHIN's engineering team today with your specifications or CAD drawings. We provide rapid response, technical consultation, and competitive pricing for standard and custom set screw solutions in advanced alloys.

Email: sales@ray-chin.com
Web:www.ray-chin.com
Response Time: < 24 hours

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