Metric Tapered Socket Pipe Plugs (DIN 906) - Stainless Steel (A2)

Metric Tapered Socket Pipe Plugs - DIN 906 | A2 Stainless Steel (SUS304) | A2-70 | Pickled & Passivated

FULLERKREG DIN 906 metric tapered hexagon socket screw plugs in A2 stainless steel (SUS304 / EN 1.4301), A2-70 strength grade, pickled & passivated surface finish. DIN 906 plugs feature a conical (tapered) metric thread that creates a self-sealing interference fit when tightened - no additional sealing washer required. Driven by an internal hexagon socket (Allen key), ideal for flush or recessed installation where external hex access is restricted.

Product Overview

• Standard: DIN 906 (Tapered Hexagon Socket Screw Plugs)
• Thread Type: Metric conical (tapered) thread - self-sealing by thread interference
• Material: A2 Stainless Steel (SUS304 / EN 1.4301)
• Strength Grade: A2-70 (ISO 3506-1)
• Surface Treatment: Pickled & Passivated
• Drive: Internal hexagon socket (Allen / hex key)
• Size Range: M6x1 to M48x1.5
• Brand: FULLERKREG

Dimensions - DIN 906 Metric Tapered Socket Plugs

All dimensions in mm. Per DIN 906 standard. d = nominal thread diameter, h = plug height, k = socket depth, Weight in kg/100pcs.

Note: S/AF = internal hex socket size (Allen key size). Dimensions per DIN 906 standard.

Material & Mechanical Properties

• Material: A2 / AISI 304 / SUS304 / EN 1.4301 - Austenitic stainless steel
• Strength Class: A2-70 per ISO 3506-1
• Tensile Strength: 700 N/mm2 min (101,500 PSI)
• Proof Load Stress: 450 N/mm2 min
• Nut Load Capacity: 700 N/mm2 min
• Hardness: HV 220 max
• Surface: Pickled & Passivated - removes free iron, maximises chromium oxide passive layer
• Slightly magnetic after cold working (typical for 304 SS)

Surface Treatment: Pickled & Passivated

• Pickling: Acid treatment (HNO3/HF) removes heat tint, scale, and free iron contamination from manufacturing
• Passivation: Rebuilds dense chromium oxide (Cr2O3) passive film for maximum corrosion protection
• Result: Bright silver-white surface - significantly better corrosion resistance than as-machined stainless steel
• No dimensional change - thread tolerances fully maintained
• Per ASTM A967 / ISO 16048 passivation requirements

Key Features

• Self-sealing conical thread: Tapered metric thread creates interference seal on tightening - no sealing washer or PTFE tape required in most applications
• Internal hex socket drive: Allen key installation allows flush or below-surface fitting - ideal where external hex access is restricted
• Compact low-profile design: Minimal protrusion above mating surface - suitable for space-constrained installations
• A2 stainless steel: Superior corrosion resistance vs carbon steel - suitable for moisture, mild acids, and atmospheric exposure
• A2-70 strength: Higher strength than standard A2-50 - suitable for moderate pressure applications
• DIN 906 compliant: Full dimensional compliance ensures interchangeability
• Wide size range: M6 to M48 from stock

DIN 906 vs DIN 910 - Key Differences

Typical Applications

• Hydraulic cylinder and manifold port closures
• Machine tool coolant and lubrication system plugging
• Gearbox and transmission housing drain/fill port sealing
• Automotive engine block and component plugging
• Pneumatic system unused port sealing
• Food and beverage processing equipment
• Chemical processing pipelines and vessels
• Marine and coastal equipment
• General industrial pipe and fitting closures
• OEM production line fastener supply

Standards & Compliance

• DIN 906 - Tapered Hexagon Socket Screw Plugs with Metric Thread
• ISO 3506-1 - Mechanical properties of corrosion-resistant stainless steel fasteners
• DIN EN ISO 3506 - Steel groups and strength classes for stainless fasteners
• ASTM A967 / ISO 16048 - Passivation of stainless steel
• RoHS / REACH - Compliant
• Mill Test Certificates (EN 10204 3.1) available on request

Ordering & Packaging

• Standard bulk packaging: per 100 pcs or per 1000 pcs
• Custom quantities for OEM and production orders
• Labelled with size, material grade (A2-70), surface treatment, and DIN 906
• Most sizes available from stock - fast dispatch
• MTC / EN 10204 3.1 certificates available on request

FAQ

Q: Does DIN 906 require a sealing washer?
A: No. The conical (tapered) metric thread of DIN 906 creates a self-sealing interference fit when tightened to the correct torque. For additional security in high-pressure or vibration applications, anaerobic thread sealant can be applied.

Q: What Allen key size do I need?
A: The internal hex socket size (S/AF) varies by thread size - see the dimensions table above. For example, M12x1.5 uses a 8mm hex key, M20x1.5 uses a 12mm hex key.

Q: What is the difference between DIN 906 and DIN 908?
A: DIN 906 has a tapered (conical) thread that self-seals by interference. DIN 908 has a cylindrical thread with a collar and requires a sealing washer. DIN 906 is driven by an internal hex socket; DIN 908 by an external hex head.

Q: Is A2-70 suitable for food and pharmaceutical applications?
A: Yes. SUS304 (A2) meets EU Regulation 1935/2004 and FDA food contact requirements. The pickled and passivated surface is hygienic and easy to clean.

Q: Are Mill Test Certificates available?
A: Yes. FULLERKREG provides EN 10204 3.1 material certificates for all A2 stainless steel fasteners upon request.

Q: What torque should be applied?
A: Torque values depend on thread size, material, and application pressure. Contact FULLERKREG technical support for application-specific torque recommendations.

All FULLERKREG DIN 906 stainless steel tapered socket pipe plugs are manufactured to DIN and ISO standards. Contact FULLERKREG for bulk pricing, OEM supply, or technical support.