1 x Bolt Partial Thread Hexagonal Head 1/2X 3 1/4" Unf Grade 5 Steel

1 x Bolt Partial Thread Hexagonal Head 1/2X 3...

1 x Bolt Partial Thread Hexagonal Head 1/2X 3 1/4" Unf Grade 5 Steel

Name: 1 x Bolt Partial Thread Hexagonal Head 1/2X 3 1/4" Unf Grade 5 Steel
Brand: Screw Express
SKU: 4129138301
Price: 4.38 GBP
Availability: InStock

Reference 4129138301_1

In stock 41 Pièces

£4.38 Incl VAT

Decreasing prices by quantity

Number of pieces	1	10	30	100
Lot price VAT included	£4.38	£43.78	£131.33	£437.73

ANSI B18-2-1, VS4126 - Bolt Partial Thread Hexagonal Head 1/2X 3 1/4" Unf Grade 5 Steel
1 inch = 25.4mm

Packaging

1 unit
10 units
30 units
100 units

Correspondence table inches and mm

Product Details

Diameter: 1/2
Length

Length

How do I measure the length of a screw?

The length of a countersunk screw is measured with the head. For all other heads, the length is measured under the head.: 3"1/483
Pitch: Pitch Unf
Material: Steel
COLOR: Grey Steel / Black
Product Family: Bolts Hexagonal Head
Number of threads per inch

Number of threads per inch

How to determine the diameter of a UNC or UNF screw:

The number of threads per inch will determine the diameter of the screw or nut of an American UNC or UNF screw.

Simply count the number of threads per inch (i.e. 25.4 mm) and refer to the table below.

For diameter 1 inch: 8 threads for 1 inch (25.4 mm) = UNC THREAD

Ø in inches

Ø in mm

Number of threads/inch in UNC

Number of threads/inch in UNF (fine pitch)

N°0

1.524

80

N°1

1.854

64

72

N°2

2.184

56

64

N°3

2.515

48

56

N°4

2.845

40

48

N°5

3.175

40

44

N°6

3.505

32

40

N°8

4.166

32

36

N°10

4.826

24

32

N°12

5.486

24

28

1/4

6.35

20

28

5/16

7.938

18

24

3/8

9.525

16

24

7/16

11.113

14

20

1/2

12.7

13

20

9/16

14.288

12

18

5/8

15.875

11

18

3/4

19.05

10

16

7/8

22.225

9

14

1”

25.4

8

14

1”1/8

28.575

7

12

1”1/4

31.75

7

12

1“1/2

38.1

6

12

1”3/4

44.45

5

-: 20
Diameter in mm: 12,7
Unit weight: 97.7 GR
Head shape: Hex Head

In stock 41 Items

ean13 3663072230248

Description

Bolt Partial Thread Hexagonal Head 1/2X 3 1/4" Unf Grade 5 Steel
Diameter = 1/2, Length = 3"1/483, Material = Steel, Pitch = Pitch Unf, Product Family = Bolts Hexagonal Head

dimensional guide (mm)

DIAMETRE en pouce	1/4	5/16	3/8	7/16	1/2	5/8	3/4	7/8	1
Head Tickness	0.158	0.206	0.238	0.286	0.318	0.398	0.473	0.553	0.617
Across flats	0.4375	0.5	0.5625	0.625	0.75	0.9375	1.125	1.3125	1.5
PAS UNF(nbre de filets au pouce (sur 25.4mm))	28	24	24	20	20	18	16	14	12
1 pouce = 25.4 mm

Other Reference : 3473576741320 3663072230248

Use Cases

anthony M. (vis-express.fr)
2026-03-15

Screw for mounting a front wishbone on a car Front wishbone of a Donkervoort D8

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Inches	mm	Inches	mm
1/8	3,2	2"1/4	57
3/16	4,8	2"1/2	64
1/4	6,3	2"3/4	70
5/16	8	3"	76
3/8	9,5	3"1/4	83
7/16	11	3"1/2	89
1/2	13	4"	102
5/8	16	4"1/2	114
3/4	19	5"	127
7/8	22	5"1/2	140
1"	25	6"	152
1"1/4	32	6"1/2	165
1"1/2	38	7"	178
1"3/4	45	8"	203
2"	51	9"	229
		10"	254

Ø in inches	Ø in mm	Number of threads/inch in UNC	Number of threads/inch in UNF (fine pitch)
N°0	1.524		80
N°1	1.854	64	72
N°2	2.184	56	64
N°3	2.515	48	56
N°4	2.845	40	48
N°5	3.175	40	44
N°6	3.505	32	40
N°8	4.166	32	36
N°10	4.826	24	32
N°12	5.486	24	28
1/4	6.35	20	28
5/16	7.938	18	24
3/8	9.525	16	24
7/16	11.113	14	20
1/2	12.7	13	20
9/16	14.288	12	18
5/8	15.875	11	18
3/4	19.05	10	16
7/8	22.225	9	14
1”	25.4	8	14
1”1/8	28.575	7	12
1”1/4	31.75	7	12
1“1/2	38.1	6	12
1”3/4	44.45	5	-