Home » DIN 914 / ISO 4027 Socket Set Screw with Cone Point A2 Stainless

DIN 914 / ISO 4027 Socket Set Screw with Cone Point A2 Stainless

DIN 914 / ISO 4027 — Socket Set Screw with Cone Point | A2 Stainless Steel

Brand: FULLERKREG  |  Material: A2 Stainless Steel (SUS304 / 1.4301)  |  Surface: Passivated (Bright Finish)

Product Overview

FULLERKREG DIN 914 / ISO 4027 Socket Set Screws with Cone Point in A2 Stainless Steel (SUS304) are precision headless set screws designed for permanent, high-force locking and positioning applications in corrosion-sensitive environments. The cone point — a sharp, conical tip — penetrates or seats into a mating conical recess on the shaft, creating an exceptionally strong mechanical lock with minimal tendency to loosen under vibration or axial load.

Combined with the inherent corrosion resistance of A2 stainless steel and a bright passivated finish, these set screws are the preferred choice for food processing, pharmaceutical, chemical, marine, and outdoor industrial applications where both corrosion resistance and secure permanent locking are required.

Standards & Specifications

  • Standards: DIN 914 (1987), ISO 4027
  • Thread Form: ISO Metric Coarse Thread (per ISO 68-1)
  • Thread Tolerance: 6g (per ISO 965-1)
  • Drive Type: Hexagon Socket (Allen / Hex Key)
  • Point Type: Cone Point — sharp conical tip (included angle: 90° for M1.6–M8; 120° for M10 and above, per DIN 914)
  • Material: A2 Stainless Steel (SUS304 / 1.4301 / 18-8)
  • Material Grade: A2 per ISO 3506-3
  • Surface Treatment: Passivated — bright, clean finish with enhanced corrosion resistance
  • Applicable Standard for Mechanical Properties: ISO 3506-3

Material & Mechanical Properties

Property Value Standard
Material A2 Stainless Steel (SUS304 / 1.4301) ISO 3506-3
Chemical Composition (Cr) 17.5 – 19.5% —
Chemical Composition (Ni) 8.0 – 10.5% —
Minimum Tensile Strength 700 MPa (A2-70) ISO 3506-3
Hardness (typical) HV 200 – 300 ISO 3506-3
Thread Tolerance 6g ISO 965-1
Surface Treatment Passivated (Bright / 洗白钝化) —
Magnetic Properties Slightly magnetic (work-hardened) —
Operating Temperature -196°C to +800°C (intermittent) —

Note: A2 stainless steel set screws are not hardened to the same level as alloy steel grades. A2 is optimized for corrosion resistance. The cone point geometry compensates for lower tip hardness by seating into a pre-drilled conical recess rather than relying solely on tip penetration.

Cone Point Geometry — Design & Function

The cone point is a sharp, conical tip that distinguishes DIN 914 / ISO 4027 from other set screw point types. Key characteristics:

  • Included angle: 90° for thread sizes M1.6 to M8; 120° for M10 and above (per DIN 914).
  • Permanent locking: The cone tip seats into a matching conical indent or drilled recess on the shaft, creating a positive, self-centering mechanical lock that resists both rotation and axial displacement.
  • Maximum holding force: Among all set screw point types, the cone point delivers the highest axial and torsional holding force when used with a matching shaft recess.
  • Self-centering: The conical geometry automatically centers the screw on the shaft recess, ensuring precise and repeatable positioning.
  • Vibration resistance: Excellent resistance to loosening under dynamic, cyclic, and shock loads due to the positive mechanical interlock.
  • Permanent installation: Best suited for applications where the set screw position is fixed and frequent repositioning is not required, as the cone point creates a permanent indent in the shaft.

Cone Point vs. Other Point Types — Selection Guide

Point Type Holding Force Shaft Damage Repositionable Best For
Cone Point (DIN 914) ✅ Maximum High (permanent indent) ❌ No Permanent locking, high-load, precision positioning
Cup Point (DIN 916) ✅ High Moderate ⚠️ Limited General shaft locking, vibration resistance
Flat Point (DIN 913) ⚠️ Moderate Minimal ✅ Yes Soft shafts, frequent adjustment
Oval Point (DIN 915) ⚠️ Moderate Minimal ✅ Yes Adjustment screws, delicate surfaces

Surface Treatment: Passivation (洗白钝化)

All FULLERKREG A2 stainless set screws undergo passivation treatment after manufacturing:

  • Process: Acid passivation (citric acid or nitric acid bath) removes free iron, machining residues, and surface contaminants from the stainless steel surface.
  • Result: A bright, clean, silver-white finish with a reinforced chromium oxide passive layer.
  • Benefit: Significantly enhances corrosion resistance beyond the as-machined state, especially in chloride-containing and humid environments.
  • Appearance: Uniform bright metallic finish — no discoloration, no scale, no heat tint.

Dimensional Range

Thread Size Pitch (mm) Socket Size s (mm) Cone Angle Length Range (mm)
M3 0.5 1.5 90° 3 – 16
M4 0.7 2.0 90° 4 – 20
M5 0.8 2.5 90° 5 – 25
M6 1.0 3.0 90° 6 – 30
M8 1.25 4.0 90° 8 – 40
M10 1.5 5.0 120° 10 – 50
M12 1.75 6.0 120° 12 – 60
M16 2.0 8.0 120° 16 – 80
M20 2.5 10.0 120° 20 – 100
M24 3.0 12.0 120° 25 – 120

Custom lengths and special configurations available upon request. Contact FULLERKREG for non-standard requirements.

Corrosion Resistance of A2 Stainless Steel

  • Excellent resistance to atmospheric corrosion, fresh water, mild acids, and alkalis.
  • Good resistance to food acids, dilute organic acids, and many chemical environments.
  • Moderate resistance to chloride environments — suitable for light marine exposure and coastal atmospheres.
  • Not recommended for direct seawater immersion or high-chloride splash zones — for these environments, A4 (SUS316) is recommended.
  • Passivation further enhances the natural chromium oxide passive layer, improving resistance to pitting and crevice corrosion.

Typical Applications

  • Permanent shaft-to-hub locking in corrosive or washdown environments
  • Precision positioning with matching conical shaft recesses
  • Food processing and beverage equipment (FDA-compatible environments)
  • Pharmaceutical and medical device manufacturing
  • Chemical processing equipment — pumps, valves, agitators
  • Marine and coastal outdoor installations (light exposure)
  • Locking of pulleys, gears, couplings, and collars on stainless shafts
  • Semiconductor and cleanroom equipment
  • Architectural and decorative hardware requiring a bright finish
  • General industrial machinery in humid or wet environments

Installation Guidelines

  • Use the correct hex key (Allen wrench) matching the socket size — refer to the dimensional table above.
  • Shaft preparation: For maximum holding force, drill a matching conical recess (90° or 120° as appropriate) in the shaft at the desired locking position before installation.
  • Ensure the shaft and bore are clean and free of oil or debris before installation.
  • Anti-galling precaution (critical for stainless): A2 stainless steel is susceptible to galling (cold welding / thread seizure). Always apply a nickel-based or molybdenum disulfide (MoS₂) anti-seize compound to the threads before tightening.
  • Tighten slowly and steadily using a calibrated torque wrench — avoid high-speed power tools which increase galling risk.
  • For vibration-critical applications, apply a stainless-compatible thread-locking compound in addition to the conical shaft recess.
  • Do not exceed the rated tightening torque for the thread size and A2-70 grade.
  • Note on permanence: The cone point creates a permanent indent in the shaft. Plan the installation position carefully before final tightening.

Quality Assurance

  • Dimensional Inspection: 100% thread gauge inspection per ISO 965-1 (6g tolerance); cone angle verification per DIN 914
  • Material Verification: PMI (Positive Material Identification) / spectrometer analysis confirming SUS304 composition
  • Hardness Testing: Vickers hardness test per ISO 3506-3
  • Tensile / Proof Load Testing: Per ISO 3506-3 (A2-70)
  • Salt Spray Test: Corrosion resistance verification post-passivation
  • Socket Torque Test: Drive socket integrity verification
  • Lot Traceability: Full material and process traceability per batch

Packaging Options

  • Bulk (polybag or carton) — standard for wholesale orders
  • Small box (labeled, per size) — available for mixed or sample orders
  • Custom packaging — available for OEM and private-label customers

Ordering Information

  • Price: Unit price per piece (USD), not per thousand. Contact us for volume pricing.
  • Customer Base: B2B wholesale only. We do not serve retail / B2C customers.
  • Order Method: All orders are placed offline. Online prices are for reference and inquiry only. Please contact us via email to place orders.
  • MOQ: Varies by size — contact FULLERKREG for minimum order quantities.
  • Lead Time (Small Batch): Approx. 30 days, delivered DDP.
  • Lead Time (Large Volume): FOB Shanghai; other Incoterms negotiable.
  • Custom Orders: Non-standard lengths, special configurations, or OEM requirements available upon request.

Frequently Asked Questions

Q: What is the difference between DIN 914 and ISO 4027?
A: DIN 914 is the German standard; ISO 4027 is the international equivalent. Both specify the same cone point set screw geometry and are dimensionally interchangeable. FULLERKREG products comply with both standards.

Q: What is the cone angle of DIN 914 set screws?
A: Per DIN 914, the included cone angle is 90° for thread sizes M1.6 to M8, and 120° for M10 and above. When drilling a matching shaft recess, use the corresponding countersink angle.

Q: Do I need to drill a recess in the shaft for cone point set screws?
A: For maximum holding force and precision positioning, a matching conical recess should be drilled in the shaft. The cone point can also be used against a flat shaft surface, but holding force will be reduced and shaft damage will be more pronounced.

Q: What is the difference between cone point (DIN 914) and cup point (DIN 916)?
A: The cone point delivers higher axial and torsional holding force and is best for permanent, precision locking applications. The cup point is more versatile, causes less shaft damage, and allows limited repositioning. Choose cone point when maximum holding force and permanent positioning are required; choose cup point for general-purpose shaft locking.

Q: What does A2 stainless steel mean?
A: A2 is the designation for austenitic stainless steel per ISO 3506-3, corresponding to SUS304 / 1.4301 (18% Chromium, 8–10% Nickel). It offers excellent general corrosion resistance and is the most widely used stainless steel grade for fasteners.

Q: What is passivation (洗白钝化)?
A: Passivation is an acid treatment that removes free iron and surface contaminants, restoring and enhancing the natural chromium oxide passive layer on the stainless steel surface. The result is a bright, clean, silver-white finish with improved corrosion resistance.

Q: Why do stainless steel set screws sometimes seize during installation?
A: Stainless steel is prone to galling (cold welding) due to its tendency to work-harden under friction. Always apply an anti-seize compound to the threads and tighten slowly with a calibrated torque wrench to prevent seizure.

Q: Do you offer custom lengths or thread pitches?
A: Yes. FULLERKREG can produce non-standard configurations. Please contact us with your technical requirements.

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