BSPP Lock Nut - 316 Stainless Steel
150lb Threaded Locknut | ISO 4144 | 20 Bar | 1/8" to 4"
Product Overview
High-quality BSPP Lock Nuts manufactured from investment cast 316 (CF8M) stainless steel. Conforming to ISO 4144 standards or higher, these 150lb class lock nuts provide excellent corrosion resistance for industrial, commercial, plumbing, and marine applications. They are used to securely fasten male-threaded fittings or components against surfaces or bulkheads.
Rated for a maximum working pressure of 20 bar (300 psi), temperature dependent. BSPP threads conform to ISO 228-1 and ISO 7-1. Available in sizes from 1/8" to 4".
Key Features
- Premium 316 Stainless Steel (CF8M): Offers superior corrosion resistance against various media and environments.
- Secure Fastening: Used to lock male threaded fittings or components in position.
- BSPP Female Thread: Standard parallel thread (ISO 228-1 / ISO 7-1) for compatibility with BSPP male threads.
- 150lb Pressure Class: Suitable for systems up to 20 bar (300 psi) maximum working pressure (temperature dependent).
- ISO 4144 Compliant: Manufactured to recognised standards for quality and dimensional consistency.
- Investment Cast Quality: Provides a high-integrity fitting suitable for industrial use.
- Wide Size Range: Available from 1/8" to 4" BSPP.
Product Specifications
- Product Type: Lock Nut / Locknut (Female Threaded)
- Material: Stainless Steel Grade 316 (CF8M)
- Manufacturing Method: Investment Casting
- Thread Type: BSPP Female Parallel Threads (conforming to ISO 228-1 / ISO 7-1)
- Pressure Class: 150lb / 150#
- Maximum Working Pressure: 20 bar / 300 psi (See Pressure-Temperature Rating)
- Manufacturing Standard: Conforms to ISO 4144 (or higher)
- Available Sizes: 1/8", 1/4", 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2", 2", 2-1/2", 3", 4"
Common Applications
- Securing male threaded fittings (like nipples or tank connectors) against surfaces.
- Positioning components accurately on pipe runs.
- Plumbing and heating installations.
- Industrial pipework in chemical processing, food & beverage industries.
- Marine applications requiring corrosion resistance.
- Hydraulic and pneumatic systems.
- Tank manufacturing and bulkhead connections.
Technical Dimensions
Dimensional Reference (mm): A = Width Across Flats, B = Thickness/Height
| Size (BSPP) | A (mm) | B (mm) | Weight (kg each) |
|---|---|---|---|
| 1/8" | 17.2 | 7.1 | 0.01 |
| 1/4" | 19 | 7.5 | 0.01 |
| 3/8" | 24 | 7.7 | 0.02 |
| 1/2" | 24.5 | 8.5 | 0.02 |
| 3/4" | 30 | 9.8 | 0.03 |
| 1" | 37.5 | 10.5 | 0.04 |
| 1-1/4" | 46.5 | 11.7 | 0.06 |
| 1-1/2" | 53 | 12.6 | 0.08 |
| 2" | 65.5 | 14.2 | 0.13 |
| 2-1/2" | 82 | 17 | 0.20 |
| 3" | 95.5 | 20 | 0.31 |
| 4" | 121.5 | 22.9 | 0.50 |
** DIMENSIONS SUBJECT TO CHANGE - PLEASE CONTACT US IF CRITICAL **
Pressure-Temperature Rating (150lb Class)
| Temperature (°C) | No-Shock Maximum Working Pressure (Bar) |
|---|---|
| -20 to 40 | 20 |
| 100 | 16.5 |
| 150 | 15 |
| 200 | 14 |
| 220 | 13.5 |
Note 1: Pressure for intermediate temperatures may be determined by the interpolation method.
Note 2: Temperatures indicated are those of the internal fluid.
Note 3: Piping loads, stresses, and moments are not taken into account in these ratings.
Note 4: These pressure ratings are for steady conditions (no sudden pressure changes or shock).
Need Assistance?
Contact Air System Controls for technical support, specific size availability, bulk pricing, or queries regarding chemical compatibility for BSPP Lock Nuts.
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