Hex head cap screws feature a solid six-sided hexagon-shaped head which allows for greater torque than traditional screws. These common threaded fasteners do not require a nut for fastening and are designed to secure objects within or against other objects for a secure, non-loosening hold.
Hex head cap screws are versatile and can be used in a variety of applications. Due to their strength and durability, these fasteners are commonly used in construction, machine parts and maintenance repairs.
Available as either partially or fully threaded, Nickel Systems stocks hex head cap screws in a variety of materials and lengths starting at 1/4″ in diameter.
For common nominal sizes, hex head cap screws are typically stocked in 1/8″ increments up to 1″ long, in 1/4″ increments from 1″ to 6″ long & in 1/2″ increments from 6″ to 10″ long.
Hex Head Cap Screw Specifications
Specifications: Standard & Metric Available
ASME
ANSI
IFI
ISO
Din
Specific Specifications: Available upon request at time of quotation
ASME B18.2.1-2012
Nonferrous Materials: ASTM F468
Stainless Steel: ASTM F593
All material grades: ASTM A193
All material grades: ASTM A320
MIL-S-1222
Nominal Length
1/4 to 3/8
7/16 and 1/2
9/16 to 3/4
7/8 and 1
7/8 to 1-1/2
Over 1-1/2
Up to 1″, incl.
+0.00 -0.03
+0.00 -0.03
+0.00 -0.03
… …
… …
… …
Over 1″ to 2-1/2″, incl.
+0.00 -0.04
+0.00 -0.06
+0.00 -0.08
+0.00 -0.10
+0.00 -0.12
+0.00 -0.18
Over 2-1/2″ to 4″, incl.
+0.00 -0.06
+0.00 -0.08
+0.00 -0.10
+0.00 -0.14
+0.00 -0.16
+0.00 -0.20
Over 4″ to 6″, incl.
+0.00 -0.10
+0.00 -0.10
+0.00 -0.10
+0.00 -0.16
+0.00 -0.18
+0.00 -0.22
Longer than 6″
+0.00 -0.18
+0.00 -0.18
+0.00 -0.18
+0.00 -0.20
+0.00 -0.22
+0.00 -0.24
Length
Nominal Diameter E, Minimum Body Length LB, Maximum Grip Gaging Length LG
A hex head cap screw is a fastener with a hex head and a threaded shaft. It is designed to be screwed into a tapped hole or attached to a nut. It is tightened using a socket or combination wrench.
Here are several unique features of a hex head cap screw:
What are the similarities & differences between a Hex Bolt and a Hex Head Cap Screw?
Similarities:
Both feature a hexagonal head for tool engagement.
Used in mechanical assembly and structural applications.
Available in various sizes & materials.
Differences:
Hex head cap screws often have tighter tolerances than a hex bolt.
Hex head cap screws often come fully threaded. In contrast, hex bolts are often partially threaded. (If ordering, make sure to specify full thread or partially threaded in your quote.)
Hex bolts are generally paired with nuts. In contrast, hex head cap screws can be inserted directly into a tapped hole.
View the comparison between a hex head cap screw & a hex head bolt below. (These samples are typical. Refer to the ASME dimensioning requirements for precise manufacturing requirements.)
Applications: Reactors, storage tanks, and heat exchangers.
Materials: Tantalum, Zirconium, and Hastelloy.
Benefits: Exceptional corrosion resistance to acidic and caustic environments.
Medical Devices
Applications: Surgical instruments, implants, and diagnostic equipment.
Materials: Titanium and medical-grade stainless steel.
Benefits: Biocompatibility, lightweight, and resistance to sterilization processes.
Power Generation
Applications: Gas turbines, nuclear reactors, and boiler systems.
Materials: Inconel, Titanium, and superalloys.
Benefits: High temperature and oxidation resistance, along with superior durability.
Tips for Purchasing Hex Head Cap Screws
Dimensions: Check your diameter & required length. Refer to our dimensioning tables above to make sure to chose a hex head cap screw that will fit your application.
Material Recommendations: Identify and select the right material that provides sufficient corrosion resistance to your application’s environment.
Thread Type: Choose the right thread type for your application.
Fine Thread: Offers better tensile strength and resistance to vibration.
Coarse Thread: Faster assembly and better performance in softer materials.
Thread Formation: Consider the proper thread formation.
Rolled Threads: Stronger and smoother, suitable for high-stress applications.
Machined Threads: Precise but less resistant to fatigue.
Specifications: Verify compliance with relevant standards like ISO (e.g., ISO 4014), DIN (e.g., DIN 933), or ASTM (e.g., ASTM A193).
Conclusion
Hex head cap screws in exotic alloys are critical components in demanding industries where performance, durability, and reliability are non-negotiable. Nickel Systems Inc. specializes in high-quality fasteners tailored to your needs.
Contact us today to start your quote and discover why we’re the trusted partner for your fastening solutions.
Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.
