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Hex Head Cap Screws

Hex Head Cap Screws

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.

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A profile picture of a hex head bolt

Specifications & Technical Data

At Nickel Systems, we prioritize your specific project requirements. Use our dimensioning and specification data to select the right hex head cap screw for your next project below. If you don’t see your specific required size, please contact us. We can supply custom lengths.

Download our Hex Head Cap Screws Dimensioning Table
Download our Hex Head Cap Screws Dimensioning Table

General Dimensions
An orthographic picture of a hex head cap screw
Nominal Diameter Size E H F
Body Diameter Width Across Flats Head Height
1/4 0.2500 7/16 5/32
5/16 0.3125 1/2 13/64
3/8 0.3750 9/16 15/64
7/16 0.4375 5/8 9/32
1/2 0.5000 3/4 5/16
9/16 0.5625 13/16 23/64
5/8 0.6250 15/16 25/64
3/4 0.7500 1-1/8 15/32
7/8 0.8750 1-5/16 35/64
1 1.0000 1-1/2 39/64
1-1/8 1.1250 1-11/16 11/64
1-1/4 1.2500 1-7/8 25/32
1-3/8 1.3750 2-1/16 27/32
1-1/2 1.5000 2-1/4 15/16
1-5/8 1.6250 2-7/16 1
1-3/4 1.7500 2-5/8 1-3/32
1-7/8 1.8750 2-13/16 1-5/32
2 2.0000 3 1-7/32
2-1/4 2.2500 3-3/8 1-3/8
2-1/2 2.5000 3-3/4 1-17/32
2-3/4 2.7500 4-1/8 1-11/16
3 3.0000 4-1/2 1-7/8
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.
Download our Hex Head Cap Screws Dimensioning Table

 

Download our Hex Head Cap Screws Length Tolerances Table

Length Tolerances
Nominal Length 1/4″ to 3/8″ 7/16″ & 1/2″ 9/16″ to 3/4″ 7/8″ & 1″ 7/8″ to 1-1/2″ Over 1-1/2″
Up to 1″, incl. -0.03 +0.00  -0.03 +0.00  -0.03 +0.00  — — — — — —
Over 1″ to 2-1/2″, incl. -0.04 +0.00  -0.06 +0.00  -0.08 +0.00  -0.10 +0.00  -0.12 +0.00  -0.18 +0.00 
Over 2-1/2″ to 4″, incl. -0.06 +0.00  -0.08 +0.00  -0.10 +0.00  -0.14 +0.00  -0.16 +0.00  -0.20 +0.00 
Over 4″ to 6″, incl. -0.10 +0.00  -0.10 +0.00  -0.10 +0.00  -0.16 +0.00  -0.18 +0.00  -0.22 +0.00 
Longer than 6″ -0.18 +0.00  -0.18 +0.00  -0.18 +0.00  -0.20 +0.00  -0.22 +0.00  -0.24 +0.00 
These tolerances follow the ASME B18.2.1 standard. If you need your fastener to conform to this standard, request it at the time of quotation.
Download our Hex Head Cap Screws Fully Threaded Minimum Body & Maximum Grip Gaging Lengths Table

Fully Threaded Minimum Body & Maximum Grip Gaging Lengths
A picture showing the body and Grip length of a fully threaded hex head cap screw
Nominal Diameter LB Min LG Max
Nominal Lengths LG Max Nominal Lengths LG Max
All Threads Series Less Than or Equal To All Threads Length Greater Than Less Than or Equal To Coarse Thread (UNC) Fine Thread (UNF) 8UN Thread
1/4 0.043 0.500 0.075 0.500 1.125 0.125 0.089 —
3/16 0.045 0.625 0.083 0.625 1.250 0.139 0.104 —
3/8 0.048 0.750 0.094 0.750 1.375 0.156 0.104 —
7/16 0.052 0.875 0.107 0.875 1.625 0.179 0.125 —
1/2 0.053 1.000 0.115 1.000 1.750 0.192 0.125 —
9/16 0.075 1.125 0.125 1.125 2.000 0.208 0.139 —
5/8 0.078 1.250 0.136 1.250 2.125 0.227 0.139 —
3/4 0.081 1.500 0.150 1.500 2.500 0.250 0.156 —
7/8 0.105 — — — 2.750 0.278 0.179 —
1 0.140 — — — 3.000 0.312 0.208 —
1 1/8 0.146 — — — 3.500 0.357 0.208 0.312
1 1/4 0.146 — — — 3.750 0.357 0.208 0.312
1 3/8 0.154 — — — 4.250 0.417 0.208 0.312
1 1/2 0.154 — — — 4.500 0.417 0.208 0.312
1 3/4 0.166 — — — 5.125 0.500 — 0.312
2 0.173 — — — 5.750 0.556 — 0.312
2 1/4 0.173 — — — 6.500 0.556 — 0.312
2 1/2 0.183 — — — 7.125 0.625 — 0.312
2 3/4 0.183 — — — 7.625 0.625 — 0.312
3 0.183 — — — 8.125 0.625 — 0.312
Download our Hex Head Cap Screws Partially Threaded Minimum Body & Maximum Grip Gaging Lengths Table

Partially Threaded Minimum Body & Maximum Grip Gaging Lengths
 Length Nominal Diameter E, Minimum Body Length LB, Maximum Grip Gaging Length LG
  
1/4 5/16 3/8 1/2 5/8 3/4 7/8 1
1 1/4 0.25 / 0.50 Full Thread Full Thread Full Thread Full Thread Full Thread Full Thread Full Thread
1 3/8 0.38 / 0.63 0.22 / 0.50 Full Thread Full Thread Full Thread Full Thread Full Thread Full Thread
1 1/2 0.50 / 0.75 0.35 / 0.62 0.19 / 0.50 Full Thread Full Thread Full Thread Full Thread Full Thread
1 5/8 0.62 / 0.88 0.47 / 0.75 0.31 / 0.62 Full Thread Full Thread Full Thread Full Thread Full Thread
1 3/4 0.75 / 1.00 0.60 / 0.88 0.44 / 0.75 Full Thread Full Thread Full Thread Full Thread Full Thread
1 7/8 0.88 / 1.12 0.72  / 1.00 0.56 / 0.88 0.24 / 0.63 Full Thread Full Thread Full Thread Full Thread
2 1.00 / 1.25 0.85 / 1.12 0.69 / 1.00 0.38 / 0.75 Full Thread Full Thread Full Thread Full Thread
2 1/8 1.12 / 1.38 0.97 / 1.25 0.81 / 1.12 0.49 / 0.88 Full Thread Full Thread Full Thread Full Thread
2 1/4 1.25 / 1.50  1.10 / 1.38 0.94 / 1.25 0.62 / 1.00 0.30 / 0.75 Full Thread  Full Thread Full Thread
2 3/8 1.38 / 1.62 1.22 / 1.50 1.06 / 1.38 0.74 / 1.12 0.42  / 0.88 Full Thread Full Thread Full Thread
2 1/2 1.50 / 1.75 1.35 / 1.62 1.19 / 1.50 0.86 / 1.25 0.55 / 1.00 Full Thread Full Thread Full Thread
2 5/8 1.62 / 1.88 1.47 / 1.75 1.31 / 1.62 0.99 / 1.38 0.67 / 1.12 0.38 / 0.88 Full Thread Full Thread
2 3/4 1.75 / 2.00 1.60 / 1.88 1.44 / 1.75 1.12 / 1.50 0.80 / 1.25 0.50 / 1.00 Full Thread Full Thread
2 7/8 1.88 / 2.12 1.72 / 2.00 1.56 / 1.88 1.24 / 1.62 0.92 / 1.38 0.62 / 1.12 0.32 / 0.88 Full Thread
3 2.00 / 2.52 1.85 / 2.12 1.69 / 2.00 1.36 / 1.75 1.05 / 1.50 0.75 / 1.25
 0.44 / 1.00 Full Thread
3 1/4 2.25 / 2.50 2.10 / 2.38 1.94 / 2.25 1.62 / 2.00 1.30 / 1.75 1.00 / 1.50 0.69 / 1.25 0.38 / 1.00
3 1/2 2.50 / 2.75  2.35 / 2.62 2.19 / 2.50 1.86 / 2.25 1.55 / 2.00 1.25 / 1.75 0.94 / 1.50 0.62 / 1.25
3 3/4 2.75 / 3.00 2.60 / 2.88 2.44 / 2.75 2.12 / 2.50 1.80 / 2.25 1.50 / 2.00 1.19 / 1.75 0.88 / 1.50
4 3.00 / 3.25 2.85 / 3.12 2.69 / 3.00 2.36 / 2.75 2.05 / 2.50 1.75 / 2.25 1.44 / 2.00 1.12 / 1.75
4 1/4 3.25 / 3.50 3.10 / 3.38 2.94 / 3.25 2.62 / 3.00 2.30 / 2.75 2.00 / 2.50 1.69 / 2.25 1.38 / 2.00
4 1/2 3.50 / 3.75 3.35 / 3.62 3.19 / 3.50 2.86 / 3.25 2.55 / 3.00 2.25 / 2.75 1.94 / 2.50 1.62 / 2.25
4 3/4 3.75 / 4.00 3.60 / 3.88 3.44 / 3.75 3.12 / 3.50 2.80 / 3.25 2.50 / 3.00 2.19 / 2.75 1.88 / 2.50
5 4.00 / 4.25 3.85 / 4.12 3.69 / 4.00 3.36 / 3.75 3.05 / 3.50 2.75 / 3.25 2.44 / 3.00 2.12 / 2.75
5 1/4 4.25 / 4.50 4.10 / 4.38 3.94 / 4.25 3.62 / 4.00 3.30 / 3.75 3.00 / 3.50 2.69 / 3.25 2.38 / 3.00
5 1/2 4.50 / 4.75 4.35 / 4.62 4.19 / 4.50 3.87 / 4.25 3.55 / 4.00 3.25 / 3.75 2.94 / 3.50 2.62 / 3.25
5 3/4 4.75 / 5.00 4.60 / 4.88 4.44 / 4.75 4.12 / 4.50 4.25 / 3.80 4.00 / 3.50 3.75 / 3.19 3.50 / 2.88
6 5.00 / 5.25 4.85 / 5.12 4.69 / 5.00 4.36 / 4.75 4.05 / 4.50 3.75 / 4.25 3.44 / 4.00 3.12 / 3.75
6 1/4 5.00 / 5.25 4.85 / 5.12 4.69 / 5.00 4.36 / 4.75 4.05 / 4.50 3.75 / 4.25 3.44 / 4.00 3.12 / 3.75
6 1/2 5.25 / 5.50  5.10 / 5.38 4.94 / 5.25  4.62 / 5.00 4.30 / 4.75 4.00 / 4.50 3.69 / 4.25 3.38 / 4.00
6 3/4 5.50 / 5.75 5.35 / 5.62 5.19 / 5.50 4.86 / 5.25 4.55 / 5.00 4.25 / 4.75  3.94 / 4.50 3.63 / 4.25
7 5.75 / 6.00 5.60 / 5.88 5.44 / 5.75  5.12 / 5.50 4.80 / 5.25 4.50 / 5.00 4.19 / 4.75 3.88 / 4.50
7 1/4 6.00 / 6.25 5.85 / 6.12 5.69 / 6.00 5.36 / 5.75 5.05 / 5.50 4.75 / 5.25 4.44 / 5.00 4.12 / 4.75
7 1/2 6.25 / 6.50 6.10 / 6.38 5.94 / 6.25 5.62 / 6.00 5.30 / 5.75 5.00 / 5.50 4.69 / 5.25 4.38 / 5.00
7 3/4 6.50 / 6.75  6.35 / 6.62 6.19 / 6.50 5.87 / 6.25  5.55 / 6.00 5.25 / 5.75 4.94 / 5.50 4.52 / 5.25
8 6.75 / 7.00 6.60 / 6.88 6.44 / 6.75 6.12 / 6.50 5.80 / 6.25 5.50 / 6.00 5.19 / 5.75 4.88 / 5.50
8 1/4 7.00 / 7.25 6.85 / 7.12 6.69 / 7.00 6.36 / 6.75 6.05 / 6.50 5.75 / 6.25 5.44 / 6.00 5.12 / 5.75
8 1/2 7.25 / 7.50  7.10 / 7.38 6.94 / 7.25 6.62 / 7.00 6.30 / 6.75 6.00 / 6.50 5.69 / 6.25 5.38 / 6.00
8 3/4 7.50 / 7.75 7.35 / 7.62 7.19 / 7.50 6.86 / 7.25 6.55 / 7.00 6.25 / 6.75 5.94 / 6.50 5.62 / 6.25
9 7.75 / 8.00 7.60 / 7.88 7.44 / 7.75 7.12 / 7.50 6.80 / 7.25 6.50 / 7.00 6.19 / 6.75 5.88 / 6.50
9 1/4 8.00 / 8.25 7.85 / 8.12 7.69 / 8.00 7.36 / 7.75 7.05 / 7.50 6.75 / 7.25 6.44 / 7.00  6.12 / 6.75
9 1/2 8.25 / 8.50 8.10 / 8.38 7.94 / 8.25 7.62 / 8.00 7.30 / 7.75 7.00 / 7.50 6.89 / 7.25 6.38 / 7.00
9 3/4 8.50 / 8.75  8.35 / 8.62 8.19 / 8.50 7.86 / 8.25 7.55 / 8.00 7.25 / 7.75 6.94 / 7.50 6.62 / 7.25
10 8.75 / 9.00 8.60 / 8.88 8.44 / 8.75 8.12 / 8.50 7.80 / 8.25 7.50 / 8.00 7.19 / 7.75 6.88 / 7.50
11 9.75 / 10.00  9.60 / 9.88 9.44 / 9.75 9.12 / 9.50 8.80 / 9.25 8.50 / 9.00 8.19 / 8.75 7.88 / 8.50
12 10.75 / 11.00  10.60 / 10.88 10.44 / 10.75 10.12 / 10.50 9.80 / 10.25 9.50 / 10.00 9.19 / 9.75 8.88 / 9.50
Downloadable Min. Body vs Max. Grip Gaging Length Table
These dimensions follow the ASME B18.2.1 standard. If you require your specific fastener to follow these specifications, please request this specification at the time of your quotation.
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Please note that Nickel Systems will supply the thread length that is most readily available at the time of fulfillment, unless specified in your quote request. Please specify full-thread, partial-thread configuration or other specifications at the time of your quotation. Kindly note that it is the customer’s responsibility to clearly indicate all required product specifications to ensure an accurate & timely order fulfillment.

What is a Hex Head Cap Screw?

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:

  • Has a washer face for even load distribution.
  • Maintains tighter tolerances compared to a hex bolt.
  • Has a chamfered end.

Hex head cap screws are also called:

A diagram picture of a hex head cap screw with its parts

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 have tighter length 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.)

Hex Head Cap Screw 7/8″ Coarse Thread Hastelloy®️ C276 Material

A comparison between a hex head cap screw and a hex head bolt

Hex Head Bolt 3/4″ Coarse Thread 2507 Super Duplex Material

A picture comparing a hex head cap screw with a hex head bolt

What Industries & applications use Hex Head Cap Screws in exotic alloys?

Aerospace
  • Applications: Aircraft engine assemblies, structural components, and landing gear systems.
  • Materials: Titanium (Titanium Grade 2, Titanium Grade 5, Titanium Grade 7, Inconel, and aerospace-grade stainless steel.
  • Benefits: High strength-to-weight ratio, corrosion resistance, and resistance to extreme temperatures.
Oil & Gas
  • Applications: Offshore rigs, pipeline flanges, and high-pressure valves.
  • Materials: Hastelloy, Duplex stainless steel (2205 Duplex, 2507 Super Duplex), and Monel (Monel 400, K Monel / Monel 500).
  • Benefits: Excellent resistance to harsh chemicals, high pressure, and saline environments.

Chemical Processing

Medical Devices

  • Applications: Surgical instruments, implants, and diagnostic equipment.
  • Materials: Titanium and medical-grade stainless steel (304 Stainless Steel, 316 Stainless Steel.
  • Benefits: Biocompatibility, lightweight, and resistance to sterilization processes.
Power Generation
  • Applications: Gas turbines, nuclear reactors, and boiler systems.
  • Materials: Inconel (Inconel 600, Inconel 625, Inconel 718), 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.
  • Thread Coverage: Consider fully threaded or partially threaded configurations.
    • Fully Threaded: The threads run along its entire body.
    • Partially Threaded: The threads only partially cover the fastener’s body. The rest of the shank is smooth.
    • The main difference between the two configurations is that partially threaded hex head cap screws are stronger and more resistant to deformation than fully threaded hex head cap screws.
  • 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.

 

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Hex Head Cap Screw Sample Products

 

Hex Head Cap Screw 1-3/8″ Coarse Thread Nitronic 60 Material

 

a profile picture of a hex head cap screw nitronic 60 material

Hex Head Cap Screw 7/8″ Coarse Thread Hastelloy®️ C276 material

 

A profile picture of a hex head cap screw hastelloy material
Hex Head Cap Screw 3/4″ Coarse Thread 2205 Duplex Material

 

A orthographic picture of a hex head cap screw 2205 duplex material

 

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Related Products

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Industries We Serve

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.

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