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FULLERKREG supplies JIS B1111 Truss Head Phillips Machine Screws in A4 marine-grade stainless steel (SUS316) with a passivated / whitened finish. The truss head profile features a wide, low-profile dome that distributes clamping load over a larger bearing surface than a standard pan head, making it ideal for thin sheet metal, plastic panels, and assemblies where a flush, low-silhouette fastener is required. A4 (SUS316) offers superior corrosion resistance over A2 due to its molybdenum content, making it the preferred choice for marine, coastal, chemical, and high-humidity environments. All screws conform to JIS B1111 dimensional requirements and are available in metric sizes M2 through M6 across a full range of lengths.
| Attribute | Detail |
|---|---|
| Standard | JIS B1111 |
| Head Type | Truss Head (Wide Low-Profile Dome) |
| Drive Type | Phillips (Cross Recess) |
| Material | A4 Marine Stainless Steel (SUS316) |
| Surface Treatment | Passivated / Whitened |
| Key Alloying Element | Molybdenum (Mo 2–3%) – enhanced chloride resistance |
| Size Range | M2 – M6 |
| Length Range | 4 mm – 40 mm |
| Thread Type | Metric Machine Thread (fully or partially threaded) |
| Hardness | HV 70–210 (per JIS B1111) |
| Tensile Strength | ≥ 450 N/mm² |
| Brand | FULLERKREG |
All dimensions in millimeters (mm). Refer to JIS B1111 for full tolerance specifications.
| Nominal Size | Thread Pitch (mm) | Head Diameter D (mm) | Head Height H (mm) | Recess Diameter (mm) Ref | Phillips Driver Size | Unit Weight (g/pc) approx. | ||
|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | |||||
| M2 | 0.4 | 4.5 | 4.1 | 1.3 | 1.1 | 2.2 | #1 | — |
| M2.5 | 0.45 | 5.7 | 5.3 | 1.6 | 1.4 | 2.5 | #1 | — |
| M3 | 0.5 | 6.8 | 6.4 | 2.05 | 1.75 | 2.8 | #1 | — |
| M4 | 0.7 | 9.4 | 8.9 | 2.65 | 2.35 | 4.3 | #2 | — |
| M5 | 0.8 | 11.8 | 11.2 | 3.25 | 2.85 | 5.0 | #2 | — |
| M6 | 1.0 | 14.0 | 13.3 | 3.9 | 3.5 | 6.3 | #3 | — |
* Unit weight column is reserved. Contact FULLERKREG for weight data sheets on specific size/length combinations.
| Nominal Diameter | 4 mm or under | Over 4 mm to 10 mm | Over 10 mm to 20 mm | Over 20 mm to 40 mm | Over 40 mm |
|---|---|---|---|---|---|
| M2 and M2.5 | — | ±0.4 | ±0.6 | ±0.8 | ±1.2 |
| M3 and M4 | — | ±0.4 | ±0.6 | ±0.8 | ±1 |
| M5 and M6 | — | ±0.8 | ±1 | ±1 | ±1 |
| Property | A2 (SUS304) | A4 (SUS316) |
|---|---|---|
| Molybdenum Content | None | 2–3% |
| Chloride Resistance | Moderate | Excellent |
| Marine / Saltwater Use | Limited | Recommended |
| Chemical Resistance | Good | Superior |
| Food / Pharma Grade | Acceptable | Preferred |
| Pitting Corrosion Resistance | Standard | Enhanced |
| Application Scenario | Recommended Size | Notes |
|---|---|---|
| Marine deck fittings & boat hardware | M4 – M6 | A4 SUS316 resists saltwater pitting and crevice corrosion |
| Coastal outdoor structures | M4 – M6 | Molybdenum content prevents chloride-induced rust |
| Food processing equipment | M3 – M6 | Passivated A4 meets hygiene and washdown requirements |
| Chemical plant & lab equipment | M3 – M6 | Superior resistance to acids and chloride solutions |
| Pharmaceutical manufacturing | M2 – M4 | SUS316 preferred for cleanroom and sterile environments |
| Thin sheet metal / plastic panels | M2 – M4 | Wide truss head prevents pull-through on thin gauge materials |
These screws are manufactured and inspected in accordance with JIS B1111 (Japanese Industrial Standard for Cross Recessed Head Machine Screws). The truss head type is defined within JIS B1111 as a wide, low-profile dome head with a flat bearing surface. Material grade A4 corresponds to austenitic stainless steel SUS316 per JIS G4303, containing 2–3% molybdenum for enhanced pitting and crevice corrosion resistance in chloride-rich environments. Surface passivation is performed to further enhance corrosion resistance without altering dimensional tolerances.
🏭 Direct Manufacturer – Produced in-house with full process control from raw material to finished fastener.
📐 JIS-Compliant Dimensions – Every batch inspected against JIS B1111 tolerances; CMM reports available on request.
🔩 A4 SUS316 Material – Certified mill test reports (MTR) provided for traceability and compliance.
🌊 Marine-Grade Passivated Finish – Molybdenum-enhanced corrosion resistance for saltwater, chemical, and outdoor environments.
📦 Bulk Wholesale Supply – MOQ-friendly packaging; bulk reels, bags, and boxes available for OEM and MRO customers.
🚢 Global Export Ready – Experienced in international logistics; export documentation and customs support included.
💬 Technical Support – Engineering team available for application consultation, custom length sourcing, and drawing review.
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