Hex Socket Cap Bolts Imperial (UNC)

Description

Hex Socket Cap Bolts Imperial Information

Head Type: Cap Head (cylindrical head with a flat top, designed for high-strength fastening with a hex socket). Hex Socket Cap Bolts Imperial
Drive Type: Internal hex (Allen key compatible) for improved torque and reduced cam-out.
Material: Select from stainless steel 304, high-tensile steel grade 8
Finish: Available in plain or zinc finishes for added corrosion resistance and colour. Polishing or Blackening also available
Thread Type: Fully threaded or partial thread in imperial UNC (standard imperial pitch) or UNF (unified national fine – threads are closer together) (diagram in photos)
Sizes: #8, #10, 1/4″, 5/16″, 3/8″, 7/16″, 1/2″
Length: 1/4″ (6.5mm) – 3″ (76.2mm)

SELECTING PITCH

Imperial bolts are most commonly used in the United States and are also found in some UK and legacy applications.

Pitch refers to the distance between threads.

Imperial pitch is measured as the number of threads per inch (TPI), meaning how many threads fit within a one-inch distance.

SELECTING SIZE

[example: 1/4″ – 20tpi (m6.3)]

1/4″ = 1/4″ thread diameter

20 TPI = There are 20 threads in a 1-inch distance

(M6.3) = Not an actual M6.3 size, but a simple way to identify that the thread width is approximately 6.3 mm

UNC 1/4″ – 20tpi bolts fit UNC 1/4″ – 20tpi nuts and 1/4″ washers

Screw diameter measured from the outer thread

SELECTING LENGTH

The head is not included in the stated length for Hex Socket Cap Bolts Imperial; only the shank is measured.

SELECTING GRADE

Stainless G304 (A2)
Suitable for standard applications, providing robust corrosion resistance and durability (popular).
[Good Corrosion Resistance] [Grey-Silver]

Stainless G316 (A4)
Ideal for marine and kitchen environments, offering superior corrosion protection.
[Great Corrosion Resistance] [Grey-Silver]

Alloy Steel (8.8 / 10.9) Zinc
High-tensile strength alloy steel with a sacrificial zinc coating, suitable for heavy-duty applications.
8.8 = 800MPa ultimate tensile strength
10.9 = 1000MPa ultimate tensile strength
[Okay Corrosion Resistance] [Silver]

Alloy Steel (8.8 / 10.9) Black
High-tensile strength alloy steel with minimal corrosion resistance, used for demanding applications.
8.8 = 800MPa ultimate tensile strength
10.9 = 1000MPa ultimate tensile strength
[Poor Corrosion Resistance] [Uncoated Black / Black Oxide]

For optimal performance and to reduce the risk of galvanic corrosion, it is recommended to use materials of the same grade in applications where corrosion resistance is critical.

✨ Stainless Steel Polishing

Bright, polished finish for stainless steel hardware.
*Not mirror finish

*Delivery time may increase by up to 2 days
*Coupons and pricing discounts do not apply

Cost: $5 minimum or +15% product price

⬛ Stainless Steel Blackening

Durable, non-reflective black finish for stainless steel hardware.
Suitable for internal and external use.

*Select Grade: Stainless G304 or G316 to enable
*Delivery time may increase by up to 14 days
*Coupons and pricing discounts do not apply
*$30 minimum blackening charge (may be shared across multiple selections through site; fee applies if minimum is not reached)

Cost: 2× product price
Example: $30 product + $30 blackening

Match with Metric Coarse or Fine Thread Nuts & Washers below

https://nutbolt.com.au/product/hexnutunc/

https://nutbolt.com.au/product/flat-washer-imperial/

Buy online now! Next day delivery selectable at checkout.

Contact us via live chat or email if you have any questions about our Hex Socket Cap Bolts Imperial or any other product.

UNC Pitch

#8-32 Threads Per Inch
#10-24 Threads Per Inch
1/4″-20 Threads Per Inch
5/16″-18 Threads Per Inch
3/8″-16 Threads Per Inch
1/2″-13 Threads Per Inch

Product may include grade markings; message us the size to confirm