UNC, 4/40", 6/32", 8/32", 10/24", Socket Screw, Cap Head, High Tensile/ 12.9, Self Colour, ISO 4762, DIN 912, BS 2470.

UNC, 4/40", 6/32", 8/32", 10/24", Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), BS 2470. Cap-screws. Fixaball sells all lengths of 4/40", 6/32", 8/32", 10/24", UNC, allen socket cap-screws at the best...
£2.29

UNC, 4/40", 6/32", 8/32", 10/24", Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), BS 2470. Cap-screws.

Fixaball sells all lengths of 4/40", 6/32", 8/32", 10/24", UNC, allen socket cap-screws at the best internet prices with free delivery.

Orders placed before 2pm are usually dispatched same day (Mon-Fri).

Please make your size and pack quantity selection from the drop down menus at the top of the page.

Allen/ Hex Socket, Cap Head Screw/ Bolts

Socket Screw is short for, 'Allen Socket Screw' or 'Hexagan Socket Screw' and is a generic term including the 'bolt' version. The, ‘Screw', term is used to describe a fastener that is fully threaded in lengths up to and around (depending on the gauge/ diameter) 1 inch (from the underside of the head). Over, around 1 inch in length the fastener will have a, 'shoulder,' or unthreaded, plain shank under the head. This space of unthreaded area confirms that the fastener is now a bolt (cap head, bolt in the case of this listing). A little confusing, no? Some engineers may call them screws if the person only uses the shorter length range of sizes, under an inch or so. Some people might simply call them, 'Allen bolts,' if they've never seen it written down in association with the Allen, Hexagonal Key. So, ‘Socket,’ refers to the hexagon shaped indentation found on the top of the fasteners’ head. Here, you can use a hexagon key (Allen Key) to tighten and loosen the fastener. The 'Cap' refers to the head which houses the hexagon socket.

High Tensile – 12.9 Grade.

Available Materials: Plain/ Self Colour and Zinc Plated.

Material/ Finish

Appearance

Level of Corrosion Resistance

Typical Application

High Tensile Steel

Self-Colour (black with no surface treatment)

Low, without further surface treatment

-          No exposure to moisture

-          Often Greased/ Oilied


UNC - UNF Capscrew Dimensions

Fixaball – Specialist Fixings and Fasteners

UNC/ UNF Hexagon Socket Cap Screws

Conforming to ASME/ ANSI B18.3 1960 Series

Pitch TPI

a

ds

h

j

Diameter

UNC

UNF

Max

Max

Max

Nom

No. 4

40

48

0.18

0.11

0.11

5/16

No. 5

40

44

0.21

0.13

0.13

3/32

No. 6

32

40

0.23

0.14

0.14

3/32

No. 8

32

36

0.27

0.16

0.16

1/8

No. 10

24

32

0.31

0.19

0.19

5/32

¼

20

28

0.38

0.25

0.25

3/16

5/16

18

24

0.44

0.31

0.31

7/32

3/8

16

24

0.56

0.38

0.38

5/16

7/16

14

20

0.63

0.44

0.44

5/16

½

13

20

0.75

0.50

0.50

3/8

5/8

11

18

0.88

0.63

0.63

½

¾

10

16

1.00

0.75

0.75

9/16

7/8

9

14

1.13

0.88

0.88

9/16

1

8

12

1.31

1.00

1.00

5/8

1.1/4

7

12

1.75

1.25

1.25

¾

1.1/2

6

12

2.00

1.50

1.50

1

UNIFIED THREAD STANDARDS 

The basic American standards for fastening screw threads as agreed upon by standard bodies of Canada, the United Kingdom, and the United States. They are a complete and integrated system of threads for fastening purposes. Their outstanding characteristic is general interchangeability of threads achieved through the standardization of thread form, diameter-pitch combinations, and limits of size

 

Unified National Coarse (UNC) is a thread form with a 60 degree flank angle rounded roots and flat crests. For a given diameter it has a larger thread pitch than an equivalent diameter UNF thread. The unified thread is based on inch sizes and was first standardised in 1948 unifying the Whitworth and American standard thread forms.

Unified National Fine (UNF) is a thread form with a 60 degree flank angle rounded roots and flat crests. For a given diameter it has a smaller thread pitch than an equivalent diameter UNC thread.

Unified National Extra Fine (UNEF) is a Unified thread form with a very fine (small) pitch that are typically used on instruments and parts requiring a fine adjustment.

Unified National (UN) thread form with a rounded root contour, applies only to external threads. (The UN thread form has a flat, or optionally, a rounded root contour.) The majority of fasteners with a Unified thread form (UNC UNF) have a rounded root contour i.e. are UNR threads.

Image is for illustrative purposes only.