Metric Hexagon Head Pipe Plugs — DIN 910 | Marine Stainless Steel A4 (SUS316) | A4-70
FULLERKREG DIN 910 metric hexagon head screw plugs with collar in A4 marine-grade stainless steel (SUS316 / 1.4401) are the premium choice for sealing threaded ports in demanding, corrosive, and high-moisture environments. Manufactured to full DIN 910 standard with A4-70 strength grade and a cleaned & passivated surface finish, these plugs provide superior resistance to chlorides, saltwater, and aggressive chemicals — far exceeding the performance of standard A2 stainless steel.
🔩 Product Overview
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Standard: DIN 910 (Hexagon Head Screw Plugs with Collar and Cylindrical Thread)
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Material: A4 Marine Stainless Steel (SUS316 / EN 1.4401)
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Strength Grade: A4-70 (per ISO 3506-1)
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Surface Treatment: Cleaned & Passivated (enhanced oxide layer, bright finish)
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Thread Type: Metric cylindrical (parallel) thread
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Size Range: M10×1.5 to M48×1.5
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Drive: External hexagon head with integral collar
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Brand: FULLERKREG
📐 Dimensions & Size Chart (DIN 910)
All dimensions in mm. Weight in kg/1000 pcs.
| D (Nominal) |
D1 |
L |
C |
B |
M |
S |
Weight (kg/1000pcs) |
| M10×1.50 |
14 |
17 |
3 |
8 |
6 |
10 |
10.69 / 12 |
| M12×1.50 |
17 |
21 |
3 |
12 |
6 |
13 |
14.2 / 20.3 |
| M14×1.50 |
20 |
21 |
3 |
12 |
6 |
17 |
14.2 / 25 |
| M16×1.50 |
22 |
21 |
3 |
12 |
6 |
19 |
18.72 / 35.2 |
| M20×1.50 |
25 |
25 |
4 |
14 |
8 |
19 |
20.88 / 64.5 |
| M22×1.50 |
27 |
25 |
4 |
14 |
8 |
22 |
20.88 / 75 |
| M24×1.50 |
30 |
27 |
4 |
14 |
8 |
24 |
23.51 / 83.6 |
| M27×1.50 |
32 |
27 |
4 |
14 |
8 |
27 |
23.51 / 108 |
| M30×1.50 |
36 |
30 |
4 |
16 |
10 |
24 |
26.17 / 148 |
| M33×1.50 |
40 |
33 |
4 |
16 |
10 |
27 |
29.88 / 200 |
| M38×1.50 |
45 |
33 |
5 |
16 |
12 |
30 |
32.95 / 300 |
| M42×1.50 |
49 |
33 |
5 |
16 |
12 |
30 |
32.95 / 300 |
| M45×1.50 |
55 |
33 |
5 |
16 |
12 |
30 |
32.95 / 300 |
| M48×1.50 |
55 |
33 |
6 |
16 |
12 |
30 |
34.88 / 375 |
⚙️ Material & Mechanical Properties
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Material Grade: A4 (AISI 316 / SUS316 / EN 1.4401) — Austenitic stainless steel with molybdenum addition
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Molybdenum Content: 2–3% Mo — key differentiator from A2, providing superior pitting and crevice corrosion resistance
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Strength Class: A4-70 per ISO 3506-1
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Tensile Strength: ≥ 700 N/mm² (101,500 PSI)
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Proof Load Stress: ≥ 450 N/mm²
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Nut Load Capacity: ≥ 700 N/mm²
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Hardness: HV 220 max
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Surface: Cleaned & Passivated — removes free iron contamination, maximises natural chromium oxide passive layer
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Non-magnetic: A4/316 is generally non-magnetic in the annealed condition
✅ Key Features & Benefits
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Superior marine-grade corrosion resistance: The 2–3% molybdenum in SUS316 dramatically improves resistance to chloride-induced pitting — essential for saltwater, coastal, and offshore environments
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Pressure-tight sealing: Cylindrical (parallel) metric thread with integral collar provides reliable metal-to-metal sealing for hydraulic and pneumatic systems
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DIN 910 compliant: Full dimensional compliance with DIN 910 standard; interchangeable with ISO-equivalent parts
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Collar design: Built-in collar acts as a stop and seating surface, ensuring consistent installation depth and preventing over-tightening
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Chemical resistance: Resistant to many acids, alkalis, and industrial chemicals — suitable for chemical processing and pharmaceutical applications
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Wide size range: M10 through M48 available from stock
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Passivated finish: Enhanced passive oxide layer for maximum corrosion protection right out of the box
🏭 Typical Applications
- Marine and offshore equipment — hull fittings, deck hardware, seawater systems
- Shipbuilding and boat manufacturing
- Coastal and harbour infrastructure
- Chemical and petrochemical processing pipelines
- Pharmaceutical and food & beverage processing (CIP systems)
- Hydraulic and pneumatic port closures in corrosive environments
- Desalination plants and water treatment facilities
- Swimming pool and spa equipment
- Pressure vessels and manifolds in aggressive media
📋 Standards & Compliance
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DIN 910 — Hexagon Head Screw Plugs with Collar and Cylindrical Thread
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ISO 3506-1 — Mechanical properties of corrosion-resistant stainless steel fasteners
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DIN EN ISO 3506 — Steel groups and strength classes for stainless fasteners
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ASTM A276 / A493 — Equivalent material reference for 316 stainless steel
- Compliant with RoHS / REACH requirements
- Material traceability and Mill Test Certificates (MTC) available upon request
🆚 A4 vs A2 — Why Choose Marine Grade?
| Property |
A2 (SUS304) |
A4 (SUS316) — This Product |
| Base Alloy |
18% Cr, 8% Ni |
16% Cr, 10% Ni, 2–3% Mo |
| Molybdenum |
None |
2–3% (pitting resistance) |
| Saltwater Resistance |
Moderate |
Excellent |
| Chloride Resistance |
Limited |
Superior |
| Chemical Resistance |
Good |
Very Good |
| Strength Grade |
A2-70 |
A4-70 |
| Recommended For |
General industrial use |
Marine, chemical, harsh environments |
📦 Ordering & Packaging
- Available in standard bulk packaging (per 100 pcs or per 1000 pcs)
- Custom quantities available for wholesale, OEM, and project orders
- Clearly labelled with size, material grade (A4-70), and DIN 910 standard
- Fast dispatch — most sizes available from stock
- Mill Test Certificates (MTC / EN 10204 3.1) available on request
❓ Frequently Asked Questions
Q: What makes A4 stainless steel better than A2 for marine applications?
A: A4 (SUS316) contains 2–3% molybdenum, which significantly improves resistance to chloride pitting and crevice corrosion — the primary failure mode in saltwater and coastal environments. A2 (SUS304) lacks molybdenum and is not recommended for prolonged saltwater exposure.
Q: Can DIN 910 A4 plugs be used without a sealing washer?
A: Yes. The integral collar provides a metal-to-metal seal. For high-pressure or critical sealing applications, PTFE tape or anaerobic thread sealant is recommended as additional insurance.
Q: Are Mill Test Certificates available for A4 material?
A: Yes. FULLERKREG provides EN 10204 3.1 material certificates for all A4 stainless steel fasteners upon request.
Q: Is A4-70 suitable for high-temperature applications?
A: A4 (SUS316) performs well up to approximately 870°C in intermittent service and 925°C in continuous service. However, for sustained high-temperature applications above 300°C, please consult our technical team.
Q: What is the difference between DIN 910 and DIN 908?
A: DIN 910 has a longer thread engagement length (L dimension) than DIN 908, making it suitable for higher-pressure sealing applications. Both use cylindrical metric thread with a collar.
Q: Are custom sizes or special materials available?
A: Yes. FULLERKREG offers custom sizes, special alloys, and non-standard configurations for OEM and project requirements. Please contact our sales team for a quotation.
All FULLERKREG DIN 910 marine stainless steel pipe plugs are manufactured and inspected to DIN standards. For bulk pricing, custom specifications, or technical support, please contact the FULLERKREG sales team.
