Home > Fastening & Joining > Hex Head Cap Screw, 304 Stainless Steel

M18 x 104mm 304 Stainless Steel Hex Cap Screw

Expert Overview

Engineered for superior performance, this M18 x 104mm hex head cap screw is crafted from premium 304 stainless steel. Offering exceptional corrosion resistance and tensile strength, it ensures reliable and long-lasting fastening in critical applications.

StandardISO 9001
Material304 Stainless Steel
FinishPlain
GradeN/A
SizeM18
Length104mm
Head Width21mm

Detailed Engineering Specifications

Precision-manufactured to tight tolerances, this M18 x 104mm hex head cap screw features a nominal diameter of M18 and a length of 104mm. The head width measures 21mm, facilitating secure engagement with standard wrenches or sockets. Constructed from grade 304 stainless steel, it provides excellent resistance to corrosion and oxidation, making it ideal for environments exposed to moisture, chemicals, or varying temperatures. Its robust design ensures high tensile and shear strength, capable of withstanding significant mechanical loads in demanding industrial assemblies.

🧊 Download 3D CAD Model (.STEP)

Verified Global OEM Partners

This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.

BossardEst. 1831
Switzerland🇨🇭
"Global leader in fastening technology."
Market Rank
🏆 Top 3 Global Fastener Network
Industry Approvals
🚀 Aerospace & Tesla Approved
Warranty & Support
🛡️ Lifetime Traceability
Green Manufacturing
🌱 Carbon Neutral by 2030
Certified:ISO 9001, RoHS, REACH
Würth GroupEst. 1945
Germany🇩🇪
"Premium assembly and fastening materials."
Market Rank
🏆 #1 Global Assembly Supplier
Industry Approvals
🚀 VW & BMW OEM
Warranty & Support
🛡️ 5-Year Industrial Warranty
Green Manufacturing
🌱 100% Recyclable Packaging
Certified:ISO 9001, DIN EN
Brighton-BestEst. 1925
USA🇺🇸
"Master distributor of industrial fasteners."
Market Rank
🏆 Largest Distributor in NA
Industry Approvals
🚀 Boeing Approved
Warranty & Support
🛡️ Global Replacement Guarantee
Green Manufacturing
🌱 Green Steel Initiative
Certified:ISO 9001, A2LA

Certifications & Compliance

RoHS Compliant:Yes
REACH Compliant:Yes
Material Traceability:Available on Request
DFARS Compliant:Yes

Installation Procedure

1. Clean the threaded hole and the screw threads to remove any debris or contaminants. 2. Engage the hex head cap screw with the corresponding threaded hole, ensuring proper thread engagement. 3. Tighten the screw using an appropriate torque wrench to the specified torque value for the application, avoiding overtightening.

Equivalent Standards (Cross-Reference)

Standard SystemDesignation
ISO EquivalentISO 898-1 / ISO 4014
DIN EquivalentDIN 931 / DIN 933
Primary StandardISO 9001

Mechanical Properties

Tensile Strength75,000 psi (515 MPa)
Yield Strength30,000 psi (205 MPa)
Elongation in 2 in.40% min
HardnessRockwell B95 max

Chemical Composition

Carbon (C)0.08% max
Chromium (Cr)18.0 - 20.0%
Nickel (Ni)8.0 - 10.5%
Manganese (Mn)2.00% max

Temperature & Environment Rating

Min Operating Temp
-320°F (-195°C)
Max Continuous Temp
1400°F (760°C)
Thermal Expansion
Typical for Material Class

Recommended Torque Values

Bolt SizeDry Torque (ft-lbs)Lubricated Torque (ft-lbs)
M18Check CalculatorReduce by 25%

Weight Reference Table

Size / TypeEst. Weight (lbs/100)Shipping Weight (kg)
M18Varies by dimensionContact Sales

Corrosion Resistance Guide

EnvironmentRating
Indoor / DryExcellent
Outdoor / ExposedExcellent
Marine / SaltwaterGood
Chemical / AcidicNot Recommended

Common Mistakes & How to Avoid Them

❌ Mistake✅ Correct Approach
Using a standard wrench that does not fully engage the hex head, leading to cam-out and potential damage.Utilize a correctly sized socket or box-end wrench that fits snugly around the hex head for maximum grip and torque transfer.
Cross-threading the screw by forcing it into the hole at an angle, which damages both the screw and the mating threads.Start threading the screw by hand to ensure it is entering the hole straight and smoothly before applying any torque.

Common Applications

  • Structural steel connections
  • Heavy machinery assembly
  • Marine and offshore equipment
  • Chemical processing plants
  • Food processing equipment

⚠️ Engineering Warnings

  • Ensure compatibility of the mating threads before installation to prevent cross-threading.
  • Always use the recommended torque specifications for the application to avoid over- or under-tightening.

Alternative Products to Consider

Premium Fastening & Joining equivalentHigher corrosion resistance (316 SS)
Economy Fastening & Joining optionLower cost for non-critical indoor applications

Frequently Asked Questions

Q: What is the Hex Head Cap Screw, 304 Stainless Steel made from?

A: This Hex Head Cap Screw, 304 Stainless Steel is manufactured from 304 Stainless Steel.

Q: What are the main applications?

A: Structural steel connections, Heavy machinery assembly, Marine and offshore equipment, Chemical processing plants, Food processing equipment.

Technical Schematic

HEX BOLT DIAGRAMSAE J429 / ASME B18.2.1HEXHEADLENGTH = 104mmAF21mm1/2"-13TIGHTEN →MECHANICAL PROPERTIESTensile Strength: 150,000 psiThread: 1/2"-13 UNCTorque Direction: Clockwise (CW)Head Marking: 6 radial lines (Grade 8)

Torque Specifications

⚡ UNIT CONVERTER

Conversion factor: 1 ft-lb ≈ 1.356 Nm

Verified Compatibility

StatusMating ComponentStandardTorque SpecEngineering Notes
No verified compatibility data found for this component.