Imperial BSPP Hexagon Head Pipe Plugs (DIN 910) - Low-Pressure Steel

Imperial BSPP Hexagon Head Pipe Plugs — DIN 910 | Carbon Steel 35K | Grade 6.8 | Black Oxide / Zinc Cr3

FULLERKREG DIN 910 imperial BSPP (British Standard Pipe Parallel) hexagon head screw plugs with collar in carbon steel 35K are engineered for reliable, cost-effective sealing of BSP-threaded ports in low-pressure piping systems, hydraulic reservoirs, machine tools, and general industrial equipment. Manufactured to DIN 910 standard at Grade 6.8 strength, available with black oxide or zinc plated Cr3 (trivalent chromium, RoHS-compliant) surface finish.

BSPP (also known as G thread per ISO 228-1) is a parallel pipe thread widely used in the UK, Europe, Asia, and Australia for hydraulic and pneumatic fittings, fluid power systems, and general pipework.

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🔩 Product Overview

• Standard: DIN 910 (Hexagon Head Screw Plugs with Collar and Cylindrical Thread)
• Thread Standard: BSPP — British Standard Pipe Parallel (ISO 228-1 / G Thread)
• Material: Carbon Steel 35K (medium carbon steel, equivalent to C35 / S35C)
• Strength Grade: 6.8 (per ISO 898-1)
• Surface Finish Options:
  • Black Oxide — matte black finish, light corrosion protection, oil-retaining surface
  • Zinc Plated Cr3 — trivalent chromium (RoHS-compliant), bright or clear zinc, enhanced corrosion resistance
• Thread Type: Parallel (cylindrical) BSP thread — seals via collar face, not thread taper
• Size Range: G1/8 to G2
• Drive: External hexagon head with integral collar
• Brand: FULLERKREG

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📐 Dimensions & Size Chart (DIN 910 — BSPP / G Thread)

All dimensions in mm. Thread designation per ISO 228-1.

Thread (G)	TPI	Thread OD (mm)	D1 (mm)	L (mm)	C (mm)	B (mm)	S / A/F (mm)	Weight (kg/1000pcs)
G 1/8	28	9.728	16	11	2	6	14	8.5
G 1/4	19	13.157	20	13	2.5	8	19	18.0
G 3/8	19	16.662	24	14	2.5	8	22	28.0
G 1/2	14	20.955	30	16	3	10	27	55.0
G 3/4	14	26.441	38	18	3	10	36	110.0
G 1	11	33.249	46	20	4	12	46	200.0
G 1-1/4	11	41.910	56	22	4	12	55	340.0
G 1-1/2	11	47.803	65	24	4	14	65	510.0
G 2	11	59.614	78	26	5	14	75	820.0

Note: Thread OD values per ISO 228-1. Dimensions L, C, B, S are per DIN 910 standard for BSPP plugs. Please verify against your specific application requirements.

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🔍 BSPP Thread Reference (ISO 228-1 / G Thread)

Thread (G)	TPI	Pitch (mm)	Major Dia. (mm)	Minor Dia. (mm)
G 1/8	28	0.907	9.728	8.566
G 1/4	19	1.337	13.157	11.445
G 3/8	19	1.337	16.662	14.950
G 1/2	14	1.814	20.955	18.631
G 3/4	14	1.814	26.441	24.117
G 1	11	2.309	33.249	30.291
G 1-1/4	11	2.309	41.910	38.952
G 1-1/2	11	2.309	47.803	44.845
G 2	11	2.309	59.614	56.656

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⚙️ Material & Mechanical Properties

• Material: Carbon Steel 35K (C35 / S35C — medium carbon steel, 0.32–0.39% C)
• Strength Grade: 6.8 per ISO 898-1
• Tensile Strength: ≥ 600 N/mm² (87,000 PSI)
• Proof Load Stress: ≥ 480 N/mm²
• Yield Strength (0.2%): ≥ 480 N/mm²
• Hardness: 190–250 HV
• Elongation: ≥ 8%

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🎨 Surface Finish Options

Option 1: Black Oxide (Blackening)

• Matte black appearance — professional industrial look
• Chemical conversion coating (magnetite Fe₃O₄)
• Light corrosion protection — suitable for indoor / dry environments
• Oil-retaining micro-porous surface reduces galling during installation
• No dimensional change — coating thickness <1 μm

Option 2: Zinc Plated — Cr3 Trivalent Chromium (RoHS Compliant)

• Bright or clear zinc electroplating with trivalent chromium passivation
• RoHS compliant — no hexavalent chromium (Cr6+)
• Salt spray resistance: ≥ 72 hours (white rust) per ISO 9227
• Coating thickness: typically 5–12 μm
• Good corrosion protection for general indoor and light outdoor use

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✅ Key Features & Benefits

• BSPP / G thread compatibility: Directly interchangeable with ISO 228-1 G-thread ports — widely used in UK, EU, Asian, and Australian hydraulic and pneumatic systems
• Face-sealing design: BSPP parallel thread seals via the collar face contact (not thread taper), requiring a bonded seal or soft washer for pressure-tight applications
• Cost-effective: Carbon steel 35K offers significant savings over stainless steel for non-corrosive environments
• DIN 910 compliant: Full dimensional compliance ensures interchangeability with standard BSP pipe fittings
• Integral collar: Built-in collar provides consistent seating depth and prevents over-insertion
• Two finish options: Black oxide for industrial aesthetics or zinc Cr3 for improved corrosion resistance
• Wide size range: G1/8 through G2 available from stock

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🏭 Typical Applications

• Hydraulic manifold and valve block BSP port closures
• Pneumatic system unused port sealing
• Machine tool coolant and lubrication system plugging
• Gearbox and transmission housing BSP drain/fill port sealing
• General industrial BSP pipe and tube fitting closures
• Automotive and heavy equipment fluid systems (BSP-threaded)
• Agricultural and construction machinery
• MRO (Maintenance, Repair & Operations) stock items
• OEM production line fastener supply

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📋 Standards & Compliance

• DIN 910 — Hexagon Head Screw Plugs with Collar and Cylindrical Thread
• ISO 228-1 — Pipe threads where pressure-tight joints are not made on the threads (BSPP / G thread)
• BS 2779 — British Standard for pipe threads (BSPP)
• ISO 898-1 — Mechanical properties of fasteners, carbon and alloy steel
• ISO 9227 — Salt spray corrosion testing (zinc plated finish)
• RoHS Directive 2011/65/EU — Zinc Cr3 finish fully compliant (no Cr6+)
• REACH Regulation — Compliant

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🔄 BSPP vs BSPT — Know the Difference

Property	BSPP (This Product)	BSPT (Tapered)
Thread Form	Parallel (cylindrical)	Tapered (1:16)
Standard	ISO 228-1 / G thread	ISO 7-1 / R thread
Sealing Method	Face seal (collar + washer/O-ring)	Thread interference seal
Reusability	Excellent — no thread deformation	Limited — taper deforms on tightening
Common Use	Hydraulics, pneumatics, instrumentation	Plumbing, water systems
Interchangeable?	No — do not mix BSPP and BSPT threads

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🔄 Surface Finish Comparison

Property	Black Oxide	Zinc Cr3 (Trivalent)
Appearance	Matte black	Bright / clear silver
Coating Thickness	<1 μm	5–12 μm
Salt Spray (white rust)	<24 hrs (without oil)	≥72 hrs
RoHS Compliant	Yes	Yes (Cr3, no Cr6+)
Best For	Indoor / dry environments	General industrial / light outdoor

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📦 Ordering & Packaging

• Available in standard bulk packaging (per 100 pcs or per 1000 pcs)
• Please specify surface finish when ordering: Black Oxide or Zinc Cr3
• Custom quantities available for OEM and production orders
• Clearly labelled with thread size (G), grade (6.8), finish type, and DIN 910 standard
• Fast dispatch — most sizes and finishes available from stock
• Material test reports and certificates of conformance available upon request

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❓ Frequently Asked Questions

Q: What is BSPP thread and how does it differ from metric thread?
A: BSPP (British Standard Pipe Parallel, also called G thread per ISO 228-1) uses a 55° Whitworth thread form with inch-based sizing (G1/8, G1/4, G1/2, etc.). Metric threads use a 60° thread form with millimetre sizing (M10, M12, etc.). They are not interchangeable.

Q: Do BSPP plugs seal on the thread or on the face?
A: BSPP is a parallel thread — it does not seal on the thread itself. Sealing is achieved via the collar face, typically using a bonded seal (dowty washer), copper washer, or O-ring. PTFE tape alone is generally not recommended for BSPP pressure sealing.

Q: Can I use a BSPP plug in a BSPT (tapered) port?
A: No. BSPP (parallel) and BSPT (tapered) threads have different geometries and are not interchangeable. Always verify the port thread type before ordering.

Q: What is the difference between black oxide and zinc Cr3 finish?
A: Black oxide provides a matte black aesthetic with minimal corrosion protection (best with supplemental oil), while zinc Cr3 offers a bright silver finish with significantly better corrosion resistance (≥72 hrs salt spray). Both are RoHS compliant.

Q: Are these suitable for high-pressure hydraulic systems?
A: These plugs are rated for low-to-medium pressure applications. For high-pressure hydraulic systems (≥20 MPa), please consult our technical team for appropriate material and grade recommendations.

Q: Are material certificates available?
A: Yes. Material test reports and certificates of conformance are available upon request for all FULLERKREG carbon steel fasteners.

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All FULLERKREG DIN 910 BSPP carbon steel pipe plugs are manufactured and inspected to DIN and ISO standards. For bulk pricing, OEM supply, custom finishes, or technical support, please contact the FULLERKREG sales team.