Home » Imperial BSPT Socket Pipe Plugs (DIN 906) - Stainless Steel (A2)

Imperial BSPT Socket Pipe Plugs (DIN 906) - Stainless Steel (A2)

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

FULLERKREG DIN 906 imperial BSPT (British Standard Pipe Taper) hexagon socket screw plugs in A2 stainless steel (SUS304 / EN 1.4301), A2-70 strength grade, pickled & passivated surface finish. BSPT (R thread, ISO 7-1) is a tapered pipe thread that creates a self-sealing interference fit on tightening - widely used in the UK, Europe, Asia, and Australia for hydraulic, pneumatic, and general pipework. Internal hexagon socket drive allows flush or recessed installation where external wrench access is restricted.

Product Overview

  • Standard: DIN 906 (Tapered Hexagon Socket Screw Plugs)
  • Thread Standard: BSPT - British Standard Pipe Taper (ISO 7-1 / R Thread)
  • Thread Type: Tapered pipe 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: R 1/8 to R 2
  • Brand: FULLERKREG

Dimensions - DIN 906 BSPT / R Thread (Stainless Steel)

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

Thread (R) TPI Thread OD (mm) h (mm) k (mm) S/AF (mm) Weight (kg/100pcs)
R 1/8 28 9.728 6 3 4 2
R 1/4 19 13.157 8 5 5 4
R 3/8 19 16.662 10 6 6 7
R 1/2 14 20.955 10 7 8 9
R 3/4 14 26.441 10 8 10 18
R 1 11 33.249 12 10 12 35
R 1-1/4 11 41.910 12 10 14 39
R 1-1/2 11 47.803 12 12 17 63
R 2 11 59.614 15 12 19 39

Note: S/AF = internal hex socket size (Allen key size). Thread OD per ISO 7-1. h, k, S dimensions per DIN 906 for BSPT plugs. Weight in kg/100pcs as per standard specification.

BSPT Thread Reference (ISO 7-1 / R Thread)

Thread (R) TPI Pitch (mm) Major Dia. (mm) Taper
R 1/8 28 0.907 9.728 1:16
R 1/4 19 1.337 13.157 1:16
R 3/8 19 1.337 16.662 1:16
R 1/2 14 1.814 20.955 1:16
R 3/4 14 1.814 26.441 1:16
R 1 11 2.309 33.249 1:16
R 1-1/4 11 2.309 41.910 1:16
R 1-1/2 11 2.309 47.803 1:16
R 2 11 2.309 59.614 1:16

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
  • 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 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 with maximum corrosion resistance
  • No dimensional change - thread tolerances fully maintained
  • Per ASTM A967 / ISO 16048 passivation requirements

Key Features

  • Self-sealing BSPT tapered thread: 1:16 taper creates interference seal on tightening - no sealing washer required in most applications
  • Internal hex socket drive: Allen key installation allows flush or below-surface fitting - ideal where external wrench access is restricted
  • Compact low-profile design: Minimal protrusion above mating surface
  • A2 stainless steel: Superior corrosion resistance vs carbon steel - suitable for moisture, mild acids, and atmospheric exposure
  • A2-70 strength: High strength for moderate pressure applications
  • DIN 906 compliant: Full dimensional compliance ensures interchangeability
  • Wide size range: R 1/8 to R 2 from stock
  • Food-safe: SUS304 meets FDA / EU 1935/2004 food contact requirements

BSPT vs BSPP - Know the Difference

Property BSPT (This Product) BSPP (Parallel)
Thread Form Tapered (1:16) Parallel (cylindrical)
Standard ISO 7-1 / R thread ISO 228-1 / G thread
Sealing Method Thread interference - self-sealing Face seal (collar + washer/O-ring)
Sealing Washer Not required Required for pressure sealing
Reusability Limited - taper deforms slightly Excellent - no thread deformation
Common Use Plumbing, general pipework, hydraulics Hydraulics, pneumatics, instrumentation
Interchangeable? No - do not mix BSPT and BSPP threads

DIN 906 vs DIN 910 - Key Differences

Property DIN 906 (This Product) DIN 910
Thread Type Tapered (BSPT / metric conical) Cylindrical (parallel) metric
Sealing Method Thread interference - self-sealing Face seal via collar
Drive Internal hex socket (Allen key) External hexagon head
Profile Low profile / flush Raised hex head with collar
Sealing Washer Not required Recommended for pressure sealing

Typical Applications

  • Hydraulic manifold and cylinder port closures (BSPT-threaded)
  • Pneumatic system unused port sealing
  • Machine tool coolant and lubrication system plugging
  • Gearbox and transmission housing BSPT drain/fill port sealing
  • Plumbing and water system port closures
  • Food and beverage processing equipment
  • Chemical processing pipelines
  • Marine and coastal equipment with BSPT fittings
  • General industrial BSP pipe and fitting closures
  • OEM production line fastener supply

Standards & Compliance

  • DIN 906 - Tapered Hexagon Socket Screw Plugs
  • ISO 7-1 - Pipe threads where pressure-tight joints are made on the threads (BSPT / R thread)
  • BS 21 - British Standard for taper pipe threads
  • ISO 3506-1 - Mechanical properties of corrosion-resistant stainless steel fasteners
  • ASTM A967 / ISO 16048 - Passivation of stainless steel
  • EU Regulation 1935/2004 - Food contact materials (SUS304 compliant)
  • 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 thread size (R), 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: What is BSPT thread and how does it differ from BSPP?
A: BSPT (British Standard Pipe Taper, R thread per ISO 7-1) is a tapered thread that seals by thread interference - no washer needed. BSPP (G thread per ISO 228-1) is parallel and requires a face seal washer. They use the same 55 degree Whitworth thread form but are not interchangeable.

Q: Does a BSPT plug need PTFE tape or thread sealant?
A: For low-pressure applications, the taper interference alone is often sufficient. For higher pressure or critical sealing, PTFE tape or anaerobic thread sealant is recommended as additional insurance.

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, R 1/2 uses an 8mm hex key, R 1 uses a 12mm hex key.

Q: Can I reuse a BSPT plug?
A: BSPT plugs can be reused, but the tapered thread may deform slightly on each installation. For critical applications, inspect threads before reuse and replace if any damage is observed.

Q: Is A2 stainless steel 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.

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

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