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High Strength Rail Stud Bolt Double End Threaded DIN 975 976 Grade 8.8 10.9 12.9

5000
MOQ
High Strength Rail Stud Bolt Double End Threaded DIN 975 976 Grade 8.8 10.9 12.9
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Features
Specifications
Length: 100-300 Mm
Grade: 4.6/4.8/5.6/5.8/6.8/8.8/10.9/12.9
Weight Per Piece: 0.43 Kg
Finish: Zinc / Hot Dip Galvanized
Thread Type: Partial Thread
Diameter: 20-30mm
Highlight:

High Strength Rail Stud Bolt

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Double End Threaded Stud Bolt

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Stud Bolt for Construction Machinery
Basic Infomation
Place of Origin: China
Brand Name: Sudelan
Certification: ISO9001
Model Number: Stud Bolt
Payment & Shipping Terms
Packaging Details: Woven bags and Wooden Pallets/Cases
Delivery Time: 30-50 Days
Payment Terms: L/C,D/A,D/P,T/T
Supply Ability: 30000 Pics per Day
Product Description
High-Strength Stud Bolt (Double-End Threaded)
Our high-strength stud bolt (double-end threaded) is a headless fastener featuring precision threads on both ends and an optional unthreaded shank. Engineered for heavy-duty industrial connections, it replaces standard bolts in scenarios requiring extreme tensile strength, frequent disassembly, or thick-joint fastening. Made from premium carbon/alloy steel and heat-treated to Grade 8.8/10.9/12.9, it delivers exceptional durability, vibration resistance, and load distribution. Suitable for flanges, pressure vessels, and structural steel, our stud bolts meet DIN 975/976, ASTM A193, and ISO 898-1 standards, ensuring reliable performance in critical applications.
Problem
Traditional hex bolts often fail in heavy-load scenarios: insufficient tensile strength leads to bending under pressure; single-sided threading causes uneven load distribution and loosening from vibration; frequent disassembly wears bolt heads and threads, increasing replacement costs. Additionally, standard bolts cannot accommodate extra-thick joints or blind holes, limiting their utility in construction, oil & gas, and large machinery. These issues result in unsafe connections, unplanned downtime, and high maintenance expenses.
Solution
Our double-end stud bolt solves these problems with a robust, headless design: dual-end threads enable balanced load distribution and secure fastening from both sides; high-grade steel (8.8-12.9) provides 800-1220 MPa tensile strength for heavy loads; precision-machined threads (Class 6g) ensure smooth nut engagement and reusability; optional black oxide/zinc/HDG finishes resist corrosion in harsh environments. By eliminating bolt-head stress and enabling easy disassembly, our stud bolt reduces maintenance costs, enhances safety, and extends service life—ideal for critical, high-stress connections.
Specifications
Product Name Double-End Threaded Stud Bolt
Standards DIN 975, DIN 976, ASTM A193 B7/B8, ISO 898-1
Material Carbon Steel (C45/1045), Alloy Steel (42CrMo, 35CrMo)
Grade 4.8, 8.8, 10.9, 12.9
Surface Finish Black Oxide, Zinc Plated, Hot-Dip Galvanized (HDG), Dacromet
Thread Size Metric: M6-M64; Imperial: 1/2"-3"
Length 20mm-1000mm (custom lengths available)
Thread Type Fully Threaded / Partial Thread (Unthreaded Shank)
Tensile Strength 8.8: ≥800 MPa; 10.9: ≥1040 MPa; 12.9: ≥1220 MPa
Hardness 8.8: 22-32 HRC; 10.9: 32-39 HRC; 12.9: 38-44 HRC
Certification ISO 9001, SGS, RoHS
MOQ 1,000 pcs
Delivery Time 5-20 days
Applications
  • Oil & Gas: Flange connections, pressure vessels, pipeline systems (high-pressure/high-temperature)
  • Construction & Steel Structures: Bridge supports, column connections, heavy machinery assembly
  • Power Generation: Wind turbines, boiler components, heat exchangers
  • Automotive & Heavy Equipment: Engine mounts, chassis connections, mining machinery
  • Marine & Coastal: Shipbuilding, dock infrastructure (HDG/stainless steel finishes)
  • General Industry: Large equipment assembly, blind-hole connections, frequent maintenance parts
How It Works

Design Structure: A cylindrical steel rod with precision external threads on both ends (full or partial) and a smooth middle shank (for partial thread types).

Installation Process:

  • One end is screwed into a pre-tapped internal thread hole (e.g., in a machine housing or thick steel plate)
  • The other end passes through the hole of the mating part
  • Nuts and washers are tightened on both ends to create a strong, clamping force

Working Principle: Dual-end threads distribute tension evenly across the joint, preventing loosening under vibration or dynamic loads. The headless design eliminates stress concentration at the bolt head, while high-grade steel resists deformation under heavy loads.

How To Choose

1. Determine Load Grade:

  • 8.8 Grade: Medium load, general machinery, indoor use
  • 10.9 Grade: Heavy load, structural steel, automotive, outdoor use
  • 12.9 Grade: Extreme load, mining equipment, high-pressure vessels

2. Select Material & Finish:

  • Carbon Steel (C45): Low cost, general use, black oxide finish
  • Alloy Steel (42CrMo): High strength, heat resistance, for oil & gas
  • Zinc/HDG Finish: Corrosion resistance for outdoor/coastal environments

3. Confirm Size & Length:

  • Thread Size: Match nut/hole size (M6-M64 metric)
  • Length: Calculate total thickness of connected parts + 2*nut height + 5-10mm (spare thread)

4. Thread Type:

  • Fully Threaded: Adjustable clamping length, general applications
  • Partial Thread: Unthreaded shank for precise alignment, high-precision machinery
Frequently Asked Questions
Q1: What's the difference between a stud bolt and a regular hex bolt?
A1: Stud bolts have no head and are threaded on both ends, enabling dual-sided fastening and even load distribution. They suit thick joints, blind holes, and frequent disassembly. Hex bolts have a head for single-sided tightening and are limited to standard, accessible joints.
Q2: Are your stud bolts compatible with standard nuts and washers?
A2: Yes. Our stud bolts follow DIN 934 (nuts) and DIN 125 (washers) standards, ensuring perfect compatibility with standard heavy hex nuts and flat washers. Custom nuts/washer sets are available upon request.
Q3: Can I use stud bolts in high-temperature or corrosive environments?
A3: Absolutely. For high-temperature applications (up to 550°C), choose Alloy Steel B7/L7 grades. For corrosive environments (coastal/chemical), select zinc-plated, HDG, or 304/316 stainless steel finishes.
Q4: Do you offer custom lengths or non-standard thread sizes?
A4: Yes. We provide full OEM/ODM support for custom lengths (20mm-1000mm), thread pitches (coarse/fine), and special materials. Submit your drawings or specs for a quote.
Q5: What quality certifications do your stud bolts have?
A5: Our stud bolts are ISO 9001, SGS, and RoHS certified. Each batch undergoes strict quality control: raw material testing, heat treatment verification, 100% dimensional inspection, and load testing. Test reports are available upon request.
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Tel : +8618158913783
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