BSPP Hexagon Pipe Lock Nut (Backnut) in 316 Stainless Steel (Standard & DIN 431)
BSPP Hexagon Pipe Lock Nut (Backnut) in 316 Stainless Steel (Standard & DIN 431) designed with BSPP Parallel Female Through-Thread (G / ISO 228-1) connections for industrial stainless steel threaded piping. Constructed as a cast stainless steel hexagonal backnut with flanged bearing face (Standard & DIN 431) in 316 (CF8M / 1.4408) Investment Cast Stainless Steel. Available across nominal sizes 1/8" to 4".
Thread Interface | BSPP Parallel Female Through-Thread (G / ISO 228-1) |
|---|---|
Material Grade | 316 (CF8M / 1.4408) Investment Cast Stainless Steel |
Nominal Size Range | 1/8"–4" (Standard & DIN 431 series) |
Body structure | Cast stainless steel hexagonal backnut with flanged bearing face (Standard & DIN 431) |
Component form | Flat hexagonal parallel-threaded lock nut |
Size
Product overview
Connection Geometry & 316 Stainless Steel Construction
This BSPP hexagon pipe lock nut (backnut) in 316 stainless steel (standard & din 431) features cast stainless steel hexagonal backnut with flanged bearing face (standard & din 431) in a flat hexagonal parallel-threaded lock nut profile, providing BSPP Parallel Female Through-Thread (G / ISO 228-1) connections for modular stainless steel piping, equipment hookups, and manifold assemblies. Manufactured in 316 (CF8M / 1.4408) Investment Cast Stainless Steel, the fitting offers molybdenum-bearing austenitic corrosion resistance suited for process water, chemical transfer, utility air, and washdown environments.
Size Coverage & Thread Assembly
The series covers nominal sizes across 1/8" to 4" (12 sizes in both LN Standard and LND DIN 431 series). Refer to the dimensional schedule on this product page to match each thread size against its corresponding envelope length, outside diameter or across-flats width, and unit weight. Before installing this BSPP hexagon pipe lock nut (backnut) in 316 stainless steel (standard & din 431), verify that your mating ports match the BSPP Parallel Female Through-Thread (G / ISO 228-1) interface and select an appropriate thread sealant or gasket for the joint. Specify the required nominal size from 1/8" to 4" (12 sizes in both LN Standard and LND DIN 431 series) and confirm installation clearance when ordering.
Technical specifications
Specifications
- Manufacturing & Standards Reference
- Investment cast, generally manufactured to ISO 4144 or above.
- Manufacturing & Standards Reference
- Investment cast, generally manufactured to ISO 4144 or above.
Dimensions · DIN431 · CH-F011
Applies only to the listed references; other material or end forms are outside this scope.
Units: SIZE: nominal pipe size; KG EACH: kg per piece. Length units appear beside applicable values.
| Nominal size | Chelsey reference | A | B | Unit weight (kg) |
|---|---|---|---|---|
| 1/8 | CH-F011-001 | 17.2 | 7 | 0.01 |
| 1/4 | CH-F011-002 | 22 | 6 | 0.01 |
| 3/8 | CH-F011-003 | 27 | 7 | 0.02 |
| 1/2 | CH-F011-004 | 32 | 8 | 0.02 |
| 3/4 | CH-F011-005 | 36 | 9 | 0.03 |
| 1 | CH-F011-006 | 46 | 10 | 0.04 |
| 1-1/4 | CH-F011-007 | 55 | 11 | 0.06 |
| 1-1/2 | CH-F011-008 | 60 | 12 | 0.08 |
| 2 | CH-F011-009 | 75 | 13 | 0.13 |
| 2-1/2 | CH-F011-010 | 95 | 16 | 0.20 |
| 3 | CH-F011-011 | 105 | 19 | 0.31 |
| 4 | CH-F011-012 | 131 | 22 | 0.50 |
Temperature/pressure reference · DIN431 · CH-F011
Applies only to the listed references; other material or end forms are outside this scope. Temperatures may be interpolated; values refer to the internal fluid temperature and exclude piping loads, stresses and moments.
Units: °C / BAR
| Temperature (°C) | Pressure (BAR) |
|---|---|
| -20 to 40 | 20 |
| 100 | 16.5 |
| 150 | 15 |
| 200 | 14 |
| 220 | 13.5 |
Dimensions · CH-F011
Applies only to the listed references; other material or end forms are outside this scope.
Units: SIZE: nominal pipe size; KG EACH: kg per piece. Length units appear beside applicable values.
| Nominal size | Chelsey reference | A | B | Unit weight (kg) |
|---|---|---|---|---|
| 1/8 | CH-F011-013 | 17.2 | 7.1 | 0.01 |
| 1/4 | CH-F011-014 | 19 | 7.5 | 0.01 |
| 3/8 | CH-F011-015 | 24 | 7.7 | 0.02 |
| 1/2 | CH-F011-016 | 24.5 | 8.5 | 0.02 |
| 3/4 | CH-F011-017 | 30 | 9.8 | 0.03 |
| 1 | CH-F011-018 | 37.5 | 10.5 | 0.04 |
| 1-1/4 | CH-F011-019 | 46.5 | 11.7 | 0.06 |
| 1-1/2 | CH-F011-020 | 53 | 12.6 | 0.08 |
| 2 | CH-F011-021 | 65.5 | 14.2 | 0.13 |
| 2-1/2 | CH-F011-022 | 82 | 17 | 0.20 |
| 3 | CH-F011-023 | 95.5 | 20 | 0.31 |
| 4 | CH-F011-024 | 121.5 | 22.9 | 0.50 |
Temperature/pressure reference · CH-F011
Applies only to the listed references; other material or end forms are outside this scope. Temperatures may be interpolated; values refer to the internal fluid temperature and exclude piping loads, stresses and moments.
Units: °C / BAR
| Temperature (°C) | Pressure (BAR) |
|---|---|
| -20 to 40 | 20 |
| 100 | 16.5 |
| 150 | 15 |
| 200 | 14 |
| 220 | 13.5 |
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