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Socket Cap Screws - UNC - A4 Stainless Steel
A4 Stainless is often referred to as 316 or 18/10 stainless. As in A2 above, the numbers 18/10 refer to the chromium and nickel content- 18% chromium and 10% nickel.
A4 stainless is often used in marine or chemical environments as it has greater corrosion resistance than A2.
The chemical composition of both A2 and A4 stainless steel are almost identical with the most notable differences being the higher nickel content and the addition of Molybdenum in A4. Molybdenum is a silvery white metal that is highly corrosion resistant, very ductile and has an extremely high melting point.
There can also be Titanium present in A4 stainless at the option of the manufacturer.
Typically, A4 grade stainless steel costs slightly more than A2 because of its enhanced chemical and production properties. The extra cost can be justified, however, because hardware made of A4 stainless steel is extra resistant to tarnish and corrosion, enabling it to last a very long time.
UNC (Unified National Coarse)
UNC stands for Unified National Coarse. It is a common imperial thread type with less threads per axial distance than its UNF equivalent.
Unified thread types (UNF and UNC) were introduced at the beginning of World War 2 to enable the interchangeability of machinery manufacturing between the USA, Canada and Great Britain. Still commonly found on a vast array of old machines and vehicles in the UK, UNF and UNC threads continue to be the standard thread in the USA and Canada.
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
5.1mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
5.1mm
MORE INFO
LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
5.1mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 3/4"
Tapping Drill Size:
5.1mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
5.1mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/4"
Tapping Drill Size:
5.1mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
5.1mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
4 1/2"
Tapping Drill Size:
5.1mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
6.6mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
6.6mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
6.6mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/4"
Tapping Drill Size:
6.6mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/2"
Tapping Drill Size:
6.6mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 3/4"
Tapping Drill Size:
6.6mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
6.6mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/2"
Tapping Drill Size:
6.6mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
6.6mm
MORE INFO
LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
6.6mm
MORE INFO
LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
MORE INFO
LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/4"
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/2"
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 3/4"
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/2"
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 3/4"
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
3 1/2"
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
9.4mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
10.8mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/4"
Tapping Drill Size:
10.8mm
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Only 1 pack left in stock
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/2"
Tapping Drill Size:
10.8mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 3/4"
Tapping Drill Size:
10.8mm
MORE INFO
LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
10.8mm
MORE INFO
LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/2"
Tapping Drill Size:
10.8mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
10.8mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/4"
Tapping Drill Size:
13.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 1/2"
Tapping Drill Size:
13.5mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
1 3/4"
Tapping Drill Size:
13.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
13.5mm
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LESS INFO
Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/4"
Tapping Drill Size:
13.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/2"
Tapping Drill Size:
13.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
13.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Tapping Drill Size:
16.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/4"
Tapping Drill Size:
16.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 1/2"
Tapping Drill Size:
16.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
2 3/4"
Tapping Drill Size:
16.5mm
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Material:
A4 Stainless Steel
Thread Type:
Imperial - UNC
Length Under Head:
3 1/4"
Tapping Drill Size:
16.5mm
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