316 Stainless Steel BSPP Female Conical-Seat Union
316 Stainless Steel BSPP Female Conical-Seat Union designed with BSPP Female × BSPP Female connections for industrial stainless steel threaded piping. Constructed as a three-Piece Conical Seat Union with Central Nut (Investment Cast) in 316 (CF8M) Stainless Steel. Available across nominal sizes 1/8"–4".
Material | 316 (CF8M) Stainless Steel |
|---|---|
Connection Ends | BSPP Female × BSPP Female |
Body Construction | Three-Piece Conical Seat Union with Central Nut (Investment Cast) |
Nominal Size Range | 1/8"–4" |
Reference Standard | Generally in accordance with ISO 4144 (150 LB series) |
Size
Product overview
Connection Geometry & 316 Stainless Steel Construction
This inline three-piece union connects two male-threaded BSP pipe ends through a pair of BSPP parallel female tailpieces drawn together by a central hexagonal collar nut. The tapered metal-to-metal conical seat allows the joint to be disconnected and reassembled for equipment maintenance without replacing a flat soft gasket. Manufactured from 316 (CF8M) stainless steel investment castings in the 150 LB fitting family referencing ISO 4144, the union body and nut provide corrosion resistance for process water, chemical transfer, compressed air, and utility lines.
Size Coverage & Thread Assembly
Dimensioned generally in accordance with ISO 4144 (150 LB series) as stated on the series datasheet (a reference dimensional design rather than full standard certification). The series spans nominal BSP thread sizes from 1/8" through 4". Use the dimensional table on this product page to check the union nut across-flats width and overall assembled length for your selected pipe size. Verify that both mating pipe ends match the BSPP female thread size and ensure adequate wrench swing clearance around the central hexagonal nut. Keep the conical metal seating surfaces clean and free of nicks during assembly; if a soft gasket interface is preferred, select a flat-seat PTFE union instead.
Technical specifications
Specifications
- Manufacturing & Standards Reference
- Investment cast, generally manufactured to ISO 4144 or above.
Dimensions · CH-F028
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-F028-001 | 29.1 | 25 | 0.08 |
| 1/4 | CH-F028-002 | 29.1 | 33.9 | 0.10 |
| 3/8 | CH-F028-003 | 34 | 36 | 0.13 |
| 1/2 | CH-F028-004 | 37.5 | 39 | 0.15 |
| 3/4 | CH-F028-005 | 44.5 | 41 | 0.20 |
| 1 | CH-F028-006 | 53.5 | 50 | 0.37 |
| 1-1/4 | CH-F028-007 | 64 | 51 | 0.48 |
| 1-1/2 | CH-F028-008 | 71.5 | 57 | 0.66 |
| 2 | CH-F028-009 | 85.5 | 62 | 0.95 |
| 2-1/2 | CH-F028-010 | 108.5 | 68.5 | 2.02 |
| 3 | CH-F028-011 | 123.5 | 78 | 2.58 |
| 4 | CH-F028-012 | 153.5 | 91.5 | 4.20 |
Temperature/pressure reference · CH-F028
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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