Huck Bolts
Huck Bolts are permanent, high-strength fasteners designed for extreme vibration resistance, high-load applications, and structural durability. Unlike conventional bolts, Huck Bolts provide tamper-proof, maintenance-free connections, making them ideal for railways, bridges, heavy machinery, aerospace, and automotive applications.
At Rajal Industries, we supply precision-engineered Huck Bolts that conform to ASTM, ASME, and manufacturer-specific standards, ensuring high shear and tensile strength, corrosion resistance, and long-lasting reliability in demanding environments.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Diameters: 1/8" to 3/4" | ASTM F844 – General specification for hardened washers used with Huck fasteners |
| Lengths: Variable | ASME B18.2.6 – American standard for high-strength tension control bolts |
| Manufacturer-Specific Standards – Huck bolts comply with proprietary specifications for rail, aerospace, and industrial applications | |
| ISO 12944 – Standard for corrosion protection coatings on fasteners | |
| AAR M-214 – North American railroad standard for Huck fasteners in railcars | |
| EN 14399-6 – European high-strength preloaded bolt standard for Huck fasteners |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Mild Steel & Carbon Steel | 8.8, 10.9, 12.9 | ISO 898-1, ASME B18.2.6 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, EN 14399-6 |
| Alloy Steel (Heat Treated) | Class 10.9, 12.9 | ASTM F844, AAR M-214 |
- Heat-Treated for Maximum Performance –Huck bolts undergo quenching and tempering to improve fatigue resistance and tensile strength
- Tensile Strength Ratings::
- Class 8.8 : 830 MPa
- Class 10.9 : 1040 MPa
- Class 12.9 : 1220 MPa
- AAR M-214 Rail-Grade Huck Bolt : 1400 MPa
Head & Huck Locking Mechanism Specifications
Proprietary Locking Collar System for Permanent Fastening
- Huck Bolts use a swaged collar mechanism that locks the pin in place permanently, ensuring zero loosening under vibration.
- No need for re-tightening, unlike conventional nuts and bolts.
Tension-Controlled & Shear-Locking Designs
- Available in tension-style Huck Bolts for high-strength load transfer.
- Shear-style Huck Bolts allow controlled load absorption in bridges, railway tracks, and construction.
- Shear-style Huck Bolts allow controlled load absorption in bridges, railway tracks, and construction.
High-Precision Threading & Machined Body
- Designed for high torque applications, ensuring secure installation and long-term reliability.
- Compatible with hydraulic, pneumatic, and mechanical installation tools.
Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/ISO Metric) | Provides high durability and easy installation | Railcars, heavy-duty vehicles, industrial machinery |
| Fine Thread (UNF/Metric Fine) | Allows higher load capacity and better stress distribution | Aerospace, shipbuilding, critical load-bearing applications |
| Tension-Controlled Huck Bolts | Ensures preloaded, high-strength connections | Construction, railway bridges, seismic-resistant structures |
| Shear-Locking Huck Bolts | Provides controlled load transfer and energy absorption | Railroad tracks, heavy steel fabrication |
Thread Fitment & Compliance
- Metric threads conform to ISO 6g tolerances, ensuring reliable load distribution.
- Imperial Huck Bolts comply with AAR M-214 for railroad applications and ASTM F844 for structural use.
Corrosion Resistance & Environmental Suitability
Huck Bolts are used in high-impact, high-vibration environments, requiring protective coatings to extend service life.
| Coating Type | Corrosion Protection Level | Ideal Applications |
|---|---|---|
| Plain Steel (No Coating) | Low | Indoor applications |
| Zinc Plated (Yellow/Blue/White/Black) | Moderate (48-96 hours SST) | General industrial fastening |
| Hot-Dip Galvanized (HDG) | High (600+ hours SST) | Outdoor, railway, and infrastructure applications |
| Dacromet/Geomet Coating | Extreme (1000+ hours SST) | Aerospace, offshore, and shipbuilding applications |
Salt Spray Testing (SST) per ASTM B117 & ISO 9227 ensures long-term rust prevention and durability.
Common Applications of Huck Bolts
- Railroad & Locomotive Manufacturing – Used in railcar chassis, bogies, and track fastenings.
- Bridges & Infrastructure Projects – Ensures high-strength, vibration-resistant connections
- Heavy Machinery & Industrial Equipment – Provides secure fastening in mining, construction, and transport industries.
- Aerospace & Shipbuilding – Used in aircraft assembly, naval construction, and high-performance applications.
- Renewable Energy & Offshore Installations – Essential for wind turbine towers, oil rigs, and marine structures.
Why Choose Rajal Industries for Huck Bolts?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
Permanent Vibration-Resistant Fastening
No re-tightening required, offering maintenance-free performance.
Stringent Quality Control
Huck Bolts undergo torque testing, impact resistance checks, and corrosion testing.
Bulk & Custom Orders
Available in various head styles, coatings, and tension ratings.
Competitive Pricing & On-Time Delivery
Fast turnaround for industrial and infrastructure projects.
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Our Offices
C-204, Vaibhav Platina, Nr. Kaveri Trishra, S P Ring road, Shilaj, Ahmedabad, Gujarat-380054
Call us
+91-846 036 2030
Email Us
rajalfast@gmail.com sales@rajalindustries.com