Imperial BSPP Hexagon Head Pipe Plugs (DIN 910) - Marine Stainless Steel (A4)

Imperial BSPP Hexagon Head Pipe Plugs - DIN 910 | Marine Stainless Steel A4 (SUS316) | A4-50 | Pickled & Passivated

FULLERKREG DIN 910 imperial BSPP hexagon head screw plugs with collar in A4 marine-grade stainless steel (SUS316 / EN 1.4401), A4-50 strength grade, pickled & passivated surface finish. The premium choice for BSP-threaded port sealing in saltwater, chemical, and aggressive industrial environments. G thread (ISO 228-1), sizes G 1/8 to G 2.

Product Overview

• Standard: DIN 910
• Thread: BSPP - ISO 228-1 / G Thread (parallel)
• Material: A4 Marine Stainless Steel (SUS316 / EN 1.4401)
• Strength Grade: A4-50 (ISO 3506-1)
• Surface: Pickled & Passivated
• Size Range: G 1/8 to G 2
• Brand: FULLERKREG

Dimensions - DIN 910 BSPP / G Thread

All dimensions in mm. Per DIN 910 standard and ISO 228-1.

Material & Mechanical Properties

• Material: A4 / AISI 316 / SUS316 / EN 1.4401 - Austenitic stainless steel with molybdenum
• Molybdenum Content: 2-3% Mo - key to superior pitting and crevice corrosion resistance
• Strength Class: A4-50 per ISO 3506-1
• Tensile Strength: 500 N/mm2 min
• Proof Load: 210 N/mm2 min
• Hardness: HV 200 max
• Surface: Pickled & Passivated - removes free iron, maximises chromium oxide passive layer
• Generally non-magnetic in annealed condition

A4-50 for BSPP pipe plugs: A4-50 is the standard grade for DIN 910 stainless BSPP plugs. The annealed condition maximises corrosion resistance and ductility - the primary requirements for sealing applications in aggressive environments.

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 - significantly better than as-machined stainless steel
• No dimensional change - thread tolerances fully maintained

Key Features

• Marine-grade corrosion resistance: 2-3% molybdenum in SUS316 dramatically improves resistance to chloride pitting - essential for saltwater and coastal environments
• BSPP / G thread: Compatible with ISO 228-1 ports used in UK, EU, Asia, and Australia
• Face-sealing design: Use with bonded seal (dowty washer) or copper washer for pressure-tight joints
• DIN 910 compliant: Interchangeable with standard BSP fittings
• Integral collar: Consistent seating depth, prevents over-insertion
• Chemical resistance: Resistant to many acids, alkalis, and industrial chemicals
• Sizes G 1/8 to G 2 from stock

Typical Applications

• Marine and offshore equipment - hull fittings, seawater systems
• Shipbuilding and boat manufacturing (BSP-threaded systems)
• Coastal and harbour infrastructure
• Chemical and petrochemical processing pipelines
• Pharmaceutical and food processing (CIP systems)
• Hydraulic manifold and valve block BSP port closures
• Desalination plants and water treatment facilities
• Swimming pool and spa equipment
• Pneumatic system unused port sealing
• OEM production line fastener supply

Standards & Compliance

• DIN 910 - Hexagon Head Screw Plugs with Collar
• ISO 228-1 - BSPP / G thread standard
• ISO 3506-1 - Stainless steel fastener mechanical properties
• BS 2779 - British Standard pipe threads
• RoHS / REACH - Compliant
• Mill Test Certificates (EN 10204 3.1) available on request

A4 (SUS316) vs A2 (SUS304) - Why Choose Marine Grade?

BSPP vs BSPT

Ordering & Packaging

• Standard bulk packaging: per 100 pcs or per 1000 pcs
• Custom quantities for OEM and production orders
• Labelled with thread size (G), grade (A4-50), surface treatment, and DIN 910
• Most sizes available from stock - fast dispatch
• MTC / EN 10204 3.1 certificates available on request

FAQ

Q: What makes A4 better than A2 for marine use?
A: A4 (SUS316) contains 2-3% molybdenum which dramatically improves resistance to chloride pitting and crevice corrosion - the primary failure mode in saltwater environments. A2 (SUS304) lacks molybdenum and is not recommended for prolonged saltwater exposure.

Q: What is BSPP / G thread?
A: BSPP uses a 55 degree Whitworth thread form with inch-based sizing (G1/8, G1/4, etc.). Not interchangeable with metric threads.

Q: How does a BSPP plug seal?
A: Via the collar face - use a bonded seal (dowty washer) or copper washer. PTFE tape alone is not recommended for pressure sealing.

Q: Why A4-50 and not A4-70?
A: A4-50 is the DIN 910 standard grade for stainless BSPP pipe plugs. Annealed condition gives maximum corrosion resistance and ductility for sealing applications.

Q: Are Mill Test Certificates available?
A: Yes. EN 10204 3.1 certificates available on request for all FULLERKREG A4 stainless fasteners.

Q: Can I use a BSPP plug in a BSPT port?
A: No. BSPP and BSPT threads are not interchangeable. Always verify port thread type before ordering.

All FULLERKREG DIN 910 BSPP marine stainless steel pipe plugs are manufactured to DIN and ISO standards. Contact FULLERKREG for bulk pricing, OEM supply, or technical support.