Global Nomenclature & Industry Equivalents
This component is documented in international engineering catalogs under various standardized terms. Familiarity with these equivalents ensures accurate specification across global supply chains:
| Designation | Industry Context |
|---|---|
| Hexagonal Threaded Pillar | European industrial catalogs; emphasizes columnar geometry |
| Double-Ended Hex Spacer | North American electrical and electronic applications |
| Studded Standoff | Military/aerospace specifications (NAS, MS) |
| Threaded Pillar with Socket | British engineering documentation |
| Sechskant-Gewindesäule | German DIN nomenclature (hex threaded column) |
| Colonne filetée hexagonale | French industrial standards |
| Pilar roscado hexagonal | Spanish/Latin American engineering |
For international procurement, Hexagonal Threaded Pillar is increasingly adopted as the preferred descriptor for components combining external and internal threads within a hex body.
Functional Architecture
The component is organized into three integral sections, each serving a distinct mechanical function:
| Section | Mechanical Role |
|---|---|
| Integral Stud | Protruding external thread for secure engagement into tapped housings, through-hole panels with captive nuts, or mating threaded components |
| Hexagonal Column | Central polygonal section enabling torque transmission via standard wrenches; also defines the standoff height between connected interfaces |
| Integrated Receptacle | Internal thread recessed into the opposite face, accepting screws, bolts, or mating threaded studs from adjacent assemblies |
This architecture enables:
Multi-Level Stacking: Serial connection of multiple pillars to achieve extended spacing
Blind Assembly: Female receptacle allows attachment from accessible side only
Field Serviceability: Either end can be disconnected without disturbing the opposite joint
Manufacturing Process: Cam-Automatic Turning
Components are produced on cam-operated automatic lathes, a manufacturing method optimized for precision turned parts:
| Process Attribute | Technical Benefit |
|---|---|
| Multi-Axis Machining | Simultaneous external hex turning, thread rolling/cutting, and internal boring in single cycle |
| Micro-Adjustable Cams | Sub-0.02 mm dimensional repeatability across production runs |
| Bar Stock Efficiency | Minimized material waste; suitable for diameters from 3 mm to 20 mm |
| Surface Integrity | Consistent surface finish (Ra 1.6–3.2 μm as-machined) reduces secondary finishing requirements |
Material Composition & Corrosion Performance
| Designation | UNS / EN Equivalent | Corrosion Resistance Profile | Service Environment |
|---|---|---|---|
| A2 / 304 | S30400 / 1.4301 | Passive chromium oxide layer; resists atmospheric corrosion, fresh water, mild chemicals | Indoor industrial equipment, consumer electronics, general fabrication |
| A4 / 316 | S31600 / 1.4401 | Molybdenum addition enhances pitting resistance; withstands chlorides, marine atmospheres, food-grade sanitation chemicals | Coastal installations, chemical processing, medical devices, marine hardware |
Both grades exhibit austenitic microstructure, providing non-magnetic behavior (work hardening may induce slight magnetic response) and excellent cryogenic temperature performance.
Thread Specifications & International Compatibility
| Thread System | External Thread (Stud) | Internal Thread (Receptacle) | Applicable Standards |
|---|---|---|---|
| Metric Coarse | M3 × 0.5 – M12 × 1.75 | M3 × 0.5 – M10 × 1.5 | ISO 724, DIN 13 |
| Metric Fine | M8 × 1.0 – M12 × 1.25 | M8 × 1.0 – M10 × 1.0 | ISO 724, DIN 13 |
| UNC | #4-40 – 1/2″-13 | #4-40 – 3/8″-16 | ASME B1.1 |
| UNF | #4-48 – 1/2″-20 | #4-48 – 3/8″-24 | ASME B1.1 |
Thread classes: 6g (metric external), 6H (metric internal); 2A (inch external), 2B (inch internal).
| Parameter | A2 Stainless (304) | A4 Stainless (316) |
|---|---|---|
| Tensile Strength (MPa) | 500 – 700 | 500 – 700 |
| Proof Stress (MPa) | 210 – 450 | 210 – 450 |
| Elongation (%) | ≥ 40 | ≥ 40 |
| Hardness (HRB) | 80 – 95 | 80 – 95 |
| Density (g/cm³) | 7.93 | 7.98 |
| Modulus of Elasticity (GPa) | 193 | 193 |
| Magnetic Permeability | < 1.02 (annealed) | < 1.02 (annealed) |
| Operating Temperature | -200°C to +300°C | -200°C to +400°C |
| Overall Length (L) | Hex Width (AF) | Stud Length (A) | Receptacle Depth (B) | Thread Size (M/F) |
|---|---|---|---|---|
| 12 mm | 5 mm | 6 mm | 6 mm | M3 / M3 |
| 18 mm | 6 mm | 8 mm | 10 mm | M4 / M4 |
| 25 mm | 8 mm | 10 mm | 15 mm | M5 / M5 |
| 32 mm | 10 mm | 12 mm | 20 mm | M6 / M6 |
| 45 mm | 12 mm | 15 mm | 25 mm | M8 / M8 |
| 60 mm | 14 mm | 20 mm | 30 mm | M10 / M10 |
Custom lengths from 8 mm to 100 mm available. Thread combinations may differ between ends (e.g., M5 stud with M4 receptacle) per customer specification.
| Finish | Process | Characteristics | Application |
|---|---|---|---|
| Passivated | Nitric or citric acid bath | Removes free iron; enhances native oxide layer; matte silver appearance | Standard for all stainless grades |
| Electropolished | Reverse-plating process | Smooth, reflective surface; reduces micro-roughness; improves cleanability | Medical devices, food processing, cosmetic applications |
| Bead Blasted | Media impact finishing | Uniform matte satin finish; hides handling marks | Architectural, visible installations |
| Black Oxide (Stainless) | Thermal-chemical conversion | Dark black finish; minimal dimensional change; anti-glare | Optical equipment, military applications |
Torque Transmission
The hexagonal column enables torque application directly to the component body, eliminating stress concentration on threads during installation. Recommended installation torque values for stainless steel:
| Thread Size | Recommended Torque (N·m) | Max Torque (N·m) |
|---|---|---|
| M3 | 0.8 – 1.2 | 1.8 |
| M4 | 1.8 – 2.5 | 3.5 |
| M5 | 3.0 – 4.0 | 6.0 |
| M6 | 5.0 – 7.0 | 10.0 |
| M8 | 12.0 – 16.0 | 22.0 |
Load Capacity
Studded standoffs withstand axial loads up to the tensile strength of the thread engagement, typically limited by the mating component rather than the pillar itself. For applications requiring extended length stability, the columnar aspect ratio (length-to-width) should not exceed 6:1 without additional lateral support.
| Inspection Point | Method | Specification |
|---|---|---|
| External Thread | Thread roll gauges (GO/NO-GO) | 6g / 2A conformance |
| Internal Thread | Thread plug gauges (GO/NO-GO) | 6H / 2B conformance |
| Concentricity | Coaxial runout measurement | ≤ 0.1 mm TIR |
| Length | Digital calipers / optical comparator | ±0.15 mm |
| Hex Width | Digital calipers | ±0.08 mm (AF) |
| Surface Condition | Visual inspection (10× magnification) | No burrs, sharp edges broken |
| Customization Category | Available Options |
|---|---|
| Length | 8 mm – 100 mm, any increment |
| Thread Combinations | Mixed sizes (e.g., M4 stud / M3 receptacle); left-hand threads |
| Hex Profile | Standard across-flats; reduced or oversize per requirement |
| Material | A2 (304), A4 (316), 17-4 PH (H900), carbon steel with plating |
| Secondary Operations | Cross-drilled holes for safety wire; slot in stud end for screwdriver |
| Thread Locking | Pre-applied nylon patch or micro-encapsulated adhesive |
| Packaging | Bulk, individual poly bags, tape-and-reel for automated assembly |
| Parameter | Detail |
|---|---|
| Minimum Order Quantity | Flexible; engineering samples available |
| Standard Stock | M3–M8, A2 stainless, common lengths (12–50 mm) |
| Lead Time (Custom) | 2–4 weeks dependent on complexity |
| Documentation | EN 10204 3.1 (material cert); PPAP Level 3 available upon request |
| Export Packaging | Corrosion-inhibiting VCI paper, sealed cartons, palletized for shipment |
