UNF, 5/8", Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), BS 2470.

UNF, 5/8", Cap Head, Socket Screw (12.9).

UNF, 5/8", Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), BS 2470. Fixaball.co.uk sells all lengths of UNF, 5/8" socket-cap-screws at the best internet prices with free delivery. Orders placed before 2pm are...

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UNF, 5/8", Cap Head, Socket Screw/ Allen Bolt, High Tensile (12.9), BS 2470.

Fixaball.co.uk sells all lengths of UNF, 5/8" 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.

Socket Cap Screws come as 'sets' and 'bolts'. The, ‘SET’, term is used to describe a fastener that is fully threaded in lengths up to and around 1 inch (from the underside of the head. Over 1 inch in length the fastener will have a, 'shoulder,' or unthreaded area under the head. This space of unthreaded area confirms that the fastener is now a bolt (cap head, bolt in this case). Some people might simply call them Allen or, 'Allan bolts,' in association with the Allen, Hexagonal Key which is used to tighten and loosen the fastener. So, ‘Socket,’ refers to the hexagon shaped indentation found on the top of the fasteners’ head.

High Tensile – 12.9 Grade.

UNC - UNF Capscrew Dimensions

Fixaball.co.uk – 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

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

High Tensile Steel - Zinc

Bright Shine – Blue to Yellow

Internal

- Low exposure to moisture

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.

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