Screws can be classified according to Type, Shape Type, Groove Type.

This classification system helps users select the appropriate screw for specific materials, installation tools, and structural requirements

1. Type

Machine Screws, Tapping Screws, Drilling Screws, Wallboard Nails, Chipboard Screws, Wood Screws, SEMS Screws, Furniture Screws and etc.

2. Shape

Hexagon Head, Hexagon Head With Flange, Square Head, T Head (Hammer Head), Mushroom Head(Truss Head), Cheese Head, Round Head, Pan Head, Countersunk Head (Flat Head), Raised Countersunk Head.

3. Groove

Cross,Slotted,Triangle Socket, Square Socket, PZ Drives, Socket Cap, Torx , Hex, etc.

FASTENER TYPES

Wood Screw Screws with a smooth shank and tapered point for use in wood.	Machine / Metal Thread Screw Screws with threads for use with a nut or tapped hole.	Sheet Metal Screw Full thread, pointed, used in sheet metal.

Hex Bolt / Set Screw Bolts with a hexagonal head with threads for use with a nut or tapped hole.	Coach Bolt Bolts with a smooth rounded head that has a small square section underneath.	Tek Screw A Sheet metal screw with a self drilling point.

Socket Screw Socket screws, also known as Allen head are fastened with a hex Allen wrench.	Eye Bolt A bolt with a circular ring on the head end. Used for attaching rope or chain.	Coach Screw Bolts with a wood thread and pointed tip.	U-Bolt Bolts in U shape for attaching to pipe or other round surfaces. Also available with a square bend.

J-Bolt J shaped bolts are used for tie-downs or as an open eye bolt.	Lag Screw Hanger bolts have wood thread on one end and machine thread on the other end.	Screw Eye Similar to an eye bolt but with wood threads instead of machine thread.	Grub screw Machine screws with no head for screwing all the way into threaded holes.

Head Styles

Countersunk A countersunk head with a flat top.	Raised A countersunk head with a rounded top.	Pan A slightly rounded head with short vertical sides.	Mush An extra wide head with a rounded top.

Round A domed head.	Hex A hexagonal Head.	Hex Washer A hex head with built in washer.	Slotted Hex Washer A hex head with built in washer and a slot.

Socket Cap A small cylindrical head using a socket drive.	Button A low profile rounded head using a socket drive.

Drive Types

Phillips and Pozi An X shaped drive.	Slotted A slot in the head.	Combination A combination of slotted and Phillips drives. Abbreviated Combo	Socket, Hex or Allen A hexagonal hole for use with an Allen wrench.

Nut Types

Hex A six sided nut. Also referred to as a finished hex nut.	Nylon Insert Lock A nut with a nylon insert to prevent backing off. Also referred to as a Nylock	Jam / Lock A hex nut with a reduced height.	Nylon Insert Jam Lock A nyloc nut with a reduced height.

Wing A nut with 'wings' for hand tightening.	Dome A nut with a domed top over the end of the fastener.	Acorn Acorn nuts are a high crown type of cap nut, used for appearance.	Flange A nut with a built in washer like flange.

Tee A nut designed to be driven into wood to create a threaded hole.	Square A four sided nut.	Cone Lock A non-reversible lock nut used for high temperature applications	Keps A nut with an attached free-spinning external tooth lockwasher.

Coupling Coupling nuts are long nuts used to connect pieces of threaded rod or other male threaded fasteners.

Washer Types

Flat A flat washer used to distribute load.	Mudguard An oversize flat washer used to further distribute load especially on soft materials.	Cup A washer used to obtain a 'finished' look. Usually used with oval head screws.	Spring The most common style of washer used to prevent nuts and bolts from backing out.

External Tooth Lock A washer with external 'teeth' Used to prevent nuts and bolts from backing out.	Internal Tooth Lock A washer with internal 'teeth' Used to prevent nuts and bolts from backing out.	Square A square shaped washer.	Heavy Duty Dock washers have a larger outside diameter and are thicker than standard.

Technical Resources - Fasteners

AS1110.1 High Tensile Metric Hex Bolts

Compliant with DIN 931/IS0 4014 Standards for Partially Threaded Hexagon Head Bolts

Note* This table is interactive. Need a specific size? Click on any row in the table to filter according to your needs.

All measurements are provided in millimetres (mm)

Size	Spanner (mm)	Pitch		Width Across Flats (S)		Head Height (K)		Thread Length (B)
Size	Spanner (mm)	Coarse	Fine	Min	Max	Min	Max	L ≤ 125	125 < L ≤ 200	L > 200
M6	16	1.00p	N/A	9.78	10.00	3.85	4.15	18	24	N/A
M8	18	1.25p	1.00p	12.73	13.00	5.15	5.45	22	28	41
M10	21	1.50p	1.25p	16.73	17.00	6.22	6.58	26	32	45
M12	24	1.75p	1.25p / 1.50p	18.67	19.00	7.32	7.68	30	36	49
M14	27	2.00p	1.50p	21.67	22.00	8.62	8.98	34	40	53
M16	30	2.00p	1.50p	23.67	24.00	9.82	10.20	38	44	57
M18	34	2.50p	1.50p	26.67	27.00	11.28	11.70	42	48	61
M20	36	2.50p	1.50p / 2.00p	29.67	30.00	12.28	12.70	46	52	65
M22	41	2.50p	1.50p	31.61	32.00	13.78	14.20	50	56	69
M24	46	3.00p	2.00p	35.38	36.00	14.78	15.20	54	60	73
M27	50	3.00p	2.00p	40.00	41.00	16.65	17.40	60	66	79
M30	55	3.50p	2.00p	45.00	46.00	18.28	19.12	66	72	85
M33	65	3.50	N/A	49.00	50.00	20.58	21.42	72	78	91
M36	75	4.00p	N/A	53.80	55.00	22.08	22.92	78	84	97
M39	85	4.00p	N/A	58.80	60.00	24.58	25.42	84	90	103
M42	95	4.50p	N/A	63.10	65.00	25.58	26.42	90	96	109
M48	95	5.00p	N/A	73.10	75.00	29.58	30.42	102	108	121
M56	85	5.50p	N/A	82.80	85.00	34.50	35.50	N/A	124	137

AS1110.2 High Tensile Metric Hex Set Screws

Compliant with DIN 933/IS0 4017 Standards for Fully Threaded Hexagon Head Bolts

Note* This table is interactive. Need a specific size? Click on any row in the table to filter according to your needs.

All measurements are provided in millimetres (mm)

Size	Spanner (mm)	Pitch		Width Across Flats (S)		Head Height (K)
Size	Spanner (mm)	Coarse	Fine	Min	Max	Min	Max
M6	16	1.00p	N/A	9.78	10.00	3.85	4.15
M8	18	1.25p	1.00p	12.73	13.00	5.15	5.45
M10	21	1.50p	1.25p	16.73	16.00 (ISO) / 17.00 (DIN)	6.22	6.58
M12	24	1.75p	1.25p / 1.50p	18.67	18.00 (ISO) / 19.00 (DIN)	7.32	7.68
M14	27	2.00p	1.50p	21.67	21.00 (ISO) / 22.00 (DIN)	8.62	8.98
M16	30	2.00p	1.50p	23.67	24.00	9.82	10.20
M18	34	2.50p	1.50p	26.67	27.00	11.28	11.70
M20	36	2.50p	1.50p / 2.00p	29.67	30.00	12.28	12.70
M22	41	2.50p	1.50p	31.61	34.00 (ISO) / 32.00 (DIN)	13.78	14.20
M24	46	3.00p	2.00p	35.38	36.00	14.78	15.20
M27	50	3.00p	2.00p	40.00	41.00	16.65	17.40
M30	55	3.50p	2.00p	45.00	46.00	18.28	19.12
M36	75	4.00p	N/A	53.80	55.00	22.08	22.92
M42	95	4.50p	N/A	63.10	65.00	25.58	26.42
M48	95	5.00p	N/A	73.10	75.00	29.58	30.42
M56	85	5.50p	N/A	82.80	85.00	34.50	35.50

AS2465 High Tensile Imperial Hex Bolts

Specifications for UNC and UNF High Tensile Partially Threaded Hexagon Head Bolts

Note*: This table is interactive. Need a specific size? Click on any row in the table to filter according to your needs.

All measurements are provided in inches.

Thread Size	Thread Pitch (TPI)		Major Diameter (in)		Head Height (in)		Across Flats (in)		Across Corners (in)		Thread Length (in)
Thread Size	UNC	UNF	Min	Max	Min	Max	Min	Max	Min	Max	L > 6	L ≤ 6
1/4"	20	28	0.2450	0.2500	0.163	0.150	0.428	0.438	0.488	0.505	1.000	0.750
5/16"	18	24	0.3065	0.3125	0.195	0.211	0.489	0.500	0.557	0.577	1.125	0.875
3/8"	16	24	0.3690	0.3750	0.226	0.243	0.551	0.562	0.628	0.650	1.250	1.000
7/16"	14	20	0.4305	0.4375	0.272	0.291	0.612	0.625	0.698	0.722	1.375	1.125
1/2"	13	20	0.4930	0.5000	0.302	0.323	0.736	0.750	0.840	0.866	1.500	1.250
9/16"	12	18	0.5545	0.5625	0.348	0.371	0.798	0.812	0.910	0.938	1.625	1.375
5/8"	11	18	0.6170	0.6250	0.378	0.403	0.922	0.938	1.051	1.083	1.750	1.500
3/4"	10	16	0.7410	0.7500	0.455	0.483	1.100	1.125	1.254	1.299	2.000	1.750
7/8"	9	14	0.8660	0.8750	0.531	0.563	1.285	1.312	1.465	1.516	2.250	2.000
1"	8	12	0.9900	1.0000	0.591	0.627	1.469	1.500	1.675	1.732	2.500	2.250
1-1/8"	7	12	1.1140	1.1250	0.658	0.718	1.631	1.688	1.859	1.949	2.750	2.500
1-1/4"	7	12	1.2390	1.2500	0.749	0.813	1.812	1.875	2.066	2.165	3.000	2.750
1-3/8"	6	12	1.3630	1.3750	0.810	0.878	1.994	2.062	2.273	2.382	3.250	3.000
1-1/2"	6	12	1.4880	1.5000	0.902	0.974	2.175	2.250	2.480	2.598	3.500	3.250
1-3/4"	5	12	1.7450	1.7500	1.036	1.100	2.400	2.500	2.800	2.900	3.750	3.500
2"	4.5	12	1.9900	2.0000	1.155	1.224	2.750	2.875	3.100	3.200	4.000	3.750

AS2465 High Tensile Imperial Hex Set Screws

Specifications for UNC and UNF Fully Threaded High Tensile Hexagon Head Bolts

Note*: This table is interactive. Need a specific size? Click on any row in the table to filter according to your needs.

All measurements are provided in inches.

Thread Size	Thread Pitch (TPI)		Major Diameter (in)		Head Height (in)		Across Flats (in)		Across Corners (in)
Thread Size	UNC	UNF	Min	Max	Min	Max	Min	Max	Min	Max
1/4"	20	28	0.2450	0.2500	0.163	0.150	0.428	0.438	0.488	0.505
5/16"	18	24	0.3065	0.3125	0.195	0.211	0.489	0.500	0.557	0.577
3/8"	16	24	0.3690	0.3750	0.226	0.243	0.551	0.562	0.628	0.650
7/16"	14	20	0.4305	0.4375	0.272	0.291	0.612	0.625	0.698	0.722
1/2"	13	20	0.4930	0.5000	0.302	0.323	0.736	0.750	0.840	0.866
9/16"	12	18	0.5545	0.5625	0.348	0.371	0.798	0.812	0.910	0.938
5/8"	11	18	0.6170	0.6250	0.378	0.403	0.922	0.938	1.051	1.083
3/4"	10	16	0.7410	0.7500	0.455	0.483	1.100	1.125	1.254	1.299
7/8"	9	14	0.8660	0.8750	0.531	0.563	1.285	1.312	1.465	1.516
1"	8	12	0.9900	1.0000	0.591	0.627	1.469	1.500	1.675	1.732
1-1/8"	7	12	1.1140	1.1250	0.658	0.718	1.631	1.688	1.859	1.949
1-1/4"	7	12	1.2390	1.2500	0.749	0.813	1.812	1.875	2.066	2.165
1-3/8"	6	12	1.3630	1.3750	0.810	0.878	1.994	2.062	2.273	2.382
1-1/2"	6	12	1.4880	1.5000	0.902	0.974	2.175	2.250	2.480	2.598
1-3/4"	5	12	1.7450	1.7500	1.036	1.100	2.400	2.500	2.800	2.900
2"	4.5	12	1.9900	2.0000	1.155	1.224	2.750	2.875	3.100	3.200

AS1112 Metric Hexagon Nuts

Compliant with AS1112/IS0 4032 Standards for Metric Hexagon Nuts

Note* This table is interactive. Need a specific size? Click on any row in the table to filter according to your needs.

All measurements are provided in millimetres (mm)

Size	Pitch		Width Across Corners (min)	Height (K)		Width Across Flats (S)
Size	Coarse	Fine	Width Across Corners (min)	Min	Max	Min	Max
M1.6	0.35p	N/A	3.41	1.05	1.30	3.02	3.20
M2	0.40p	N/A	4.32	1.35	1.60	3.82	4.00
M2.5	0.45p	N/A	5.45	1.75	2.00	4.82	5.00
M3	0.50p	N/A	6.01	2.15	2.40	5.32	5.50
M4	0.70p	N/A	7.66	2.90	3.20	6.78	7.00
M5	0.80p	N/A	8.79	4.40	4.70	7.78	8.00
M6	1.00p	N/A	11.05	4.90	5.20	9.78	10.00
M8	1.25p	1.00p	14.38	6.44	6.80	12.73	13.00
M10	1.50p	1.25p	17.77	8.04	8.40	15.73	16.00
M12	1.75p	1.25p / 1.50p	20.03	10.37	10.80	17.73	18.00
M14	2.00p	1.50p	23.36	12.10	12.80	20.67	21.00
M16	2.00p	1.50p	26.75	14.10	14.80	23.67	24.00
M18	2.50p	1.50p	29.56	15.10	15.80	26.16	27.00
M20	2.50p	1.50p	32.95	16.90	18.00	29.16	30.00
M22	2.50p	1.50p	37.29	18.10	19.40	33.00	34.00
M24	3.00p	2.00p / 1.50p	39.55	20.20	21.50	35.00	36.00
M27	3.00p	N/A	45.20	22.50	23.80	40.00	41.00
M30	3.50p	N/A	50.85	24.30	25.60	45.00	46.00
M33	3.50p	N/A	55.37	27.40	28.70	49.00	50.00
M36	4.00p	N/A	60.79	29.40	31.00	53.80	55.00
M42	4.50p	N/A	71.30	32.40	34.00	63.10	65.00
M48	5.00p	N/A	82.60	36.40	38.00	73.10	75.00
M56	5.50p	N/A	93.56	43.40	45.00	82.80	85.00
M64	6.00p	N/A	104.86	49.10	51.00	92.80	95.00

ISO 7040 Nylon Locking (Nyloc) Nuts

Compliant with AS 1214-1983/ISO 7040/DIN 985 Standards for Prevailing torque nuts with nonmetalic insert

Note* This table is interactive. Need a specific size? Click on any row in the table to filter according to your needs.

All measurements are provided in millimetres (mm)

Thread Diameter (D)	Pitch		Width Across Corners (min)	Nut Height Overall		Hex Height (min)	Width Across Flats
Thread Diameter (D)	Coarse	Fine	Width Across Corners (min)	Min	Max	Hex Height (min)	Min	Max
M3	0.50p	N/A	6.01	4.02	4.50	2.15	5.32	5.50
M4	0.70p	N/A	7.66	5.52	6.00	2.90	6.78	7.00
M5	0.80p	N/A	8.79	6.22	6.80	4.40	7.78	8.00
M6	1.00p	N/A	11.05	7.42	8.00	4.90	9.78	10.00
M8	1.25p	1.00p	14.38	8.92	9.50	6.44	12.73	13.00
M10	1.50p	1.25p	17.77	11.20	11.90	8.04	15.73	16.00
M12	1.75p	1.25p / 1.50p	20.03	14.20	14.90	10.37	17.73	18.00
M14	2.00p	1.50p	23.36	15.90	17.00	12.10	20.67	21.00
M16	2.00p	1.50p	26.75	17.80	19.10	14.10	23.67	24.00
M18 (DIN 985)	2.50p	1.50p	29.56	17.66	18.50	13.00	26.16	27.00
M20	2.50p	1.50p	32.95	20.70	22.80	16.90	29.16	30.00
M22 (DIN 985)	2.50p	1.50p	35.21	20.70	22.00	15.00	31.00	32.00
M24	3.00p	1.50p / 2.50p	39.55	25.00	27.10	20.20	35.00	36.00
M27 (DIN 985)	3.00p	2.00p	45.20	25.70	27.00	17.00	40.00	41.00
M30	3.50p	N/A	50.85	30.10	32.60	24.30	45.00	46.00
M33 (DIN 985)	3.50p	N/A	55.37	31.40	33.00	22.00	49.00	50.00
M36	4.00p	N/A	60.79	36.40	38.90	29.40	53.80	55.00
M42 (DIN 985)	4.50p	N/A	72.09	40.50	42.00	23.10	63.80	65.00

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BOLTS & SCREWS

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Screws can be categorized based on three primary characteristics: Type, Shape Type, and Groove Type.

Type refers to the screw’s functional design and application, such as machine screws (for metal or plastic), wood screws (with coarse threads for wood), self-tapping screws (to create their own threads), or sheet metal screws (sharp tips for thin materials).
Shape Type describes the head geometry, including pan head (rounded top), flat head (countersunk for flush surfaces), hex head (six-sided for wrench use), or oval head (decorative with a slight dome).
Groove Type (or Drive Type) indicates the recess pattern for driving the screw, such as slotted (straight line), Phillips (cross-shaped), Torx (star-shaped), or hex socket (internal hexagonal for Allen keys).

对比

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Description
Technical Resources

Description

FASTENER TYPES

Wood Screw Screws with a smooth shank and tapered point for use in wood.	Machine / Metal Thread Screw Screws with threads for use with a nut or tapped hole.	Sheet Metal Screw Full thread, pointed, used in sheet metal.

Hex Bolt / Set Screw Bolts with a hexagonal head with threads for use with a nut or tapped hole.	Coach Bolt Bolts with a smooth rounded head that has a small square section underneath.	Tek Screw A Sheet metal screw with a self drilling point.

Socket Screw Socket screws, also known as Allen head are fastened with a hex Allen wrench.	Eye Bolt A bolt with a circular ring on the head end. Used for attaching rope or chain.	Coach Screw Bolts with a wood thread and pointed tip.	U-Bolt Bolts in U shape for attaching to pipe or other round surfaces. Also available with a square bend.

J-Bolt J shaped bolts are used for tie-downs or as an open eye bolt.	Lag Screw Hanger bolts have wood thread on one end and machine thread on the other end.	Screw Eye Similar to an eye bolt but with wood threads instead of machine thread.	Grub screw Machine screws with no head for screwing all the way into threaded holes.

Head Styles

Countersunk A countersunk head with a flat top.	Raised A countersunk head with a rounded top.	Pan A slightly rounded head with short vertical sides.	Mush An extra wide head with a rounded top.

Round A domed head.	Hex A hexagonal Head.	Hex Washer A hex head with built in washer.	Slotted Hex Washer A hex head with built in washer and a slot.

Socket Cap A small cylindrical head using a socket drive.	Button A low profile rounded head using a socket drive.

Drive Types

Phillips and Pozi An X shaped drive.	Slotted A slot in the head.	Combination A combination of slotted and Phillips drives. Abbreviated Combo	Socket, Hex or Allen A hexagonal hole for use with an Allen wrench.

Nut Types

Hex A six sided nut. Also referred to as a finished hex nut.	Nylon Insert Lock A nut with a nylon insert to prevent backing off. Also referred to as a Nylock	Jam / Lock A hex nut with a reduced height.	Nylon Insert Jam Lock A nyloc nut with a reduced height.

Wing A nut with 'wings' for hand tightening.	Dome A nut with a domed top over the end of the fastener.	Acorn Acorn nuts are a high crown type of cap nut, used for appearance.	Flange A nut with a built in washer like flange.

Tee A nut designed to be driven into wood to create a threaded hole.	Square A four sided nut.	Cone Lock A non-reversible lock nut used for high temperature applications	Keps A nut with an attached free-spinning external tooth lockwasher.

Coupling Coupling nuts are long nuts used to connect pieces of threaded rod or other male threaded fasteners.

Washer Types

Flat A flat washer used to distribute load.	Mudguard An oversize flat washer used to further distribute load especially on soft materials.	Cup A washer used to obtain a 'finished' look. Usually used with oval head screws.	Spring The most common style of washer used to prevent nuts and bolts from backing out.

External Tooth Lock A washer with external 'teeth' Used to prevent nuts and bolts from backing out.	Internal Tooth Lock A washer with internal 'teeth' Used to prevent nuts and bolts from backing out.	Square A square shaped washer.	Heavy Duty Dock washers have a larger outside diameter and are thicker than standard.

Technical Resources

Size	Spanner (mm)	Pitch		Width Across Flats (S)		Head Height (K)		Thread Length (B)
Size	Spanner (mm)	Coarse	Fine	Min	Max	Min	Max	L ≤ 125	125 < L ≤ 200	L > 200
M6	16	1.00p	N/A	9.78	10.00	3.85	4.15	18	24	N/A
M8	18	1.25p	1.00p	12.73	13.00	5.15	5.45	22	28	41
M10	21	1.50p	1.25p	16.73	17.00	6.22	6.58	26	32	45
M12	24	1.75p	1.25p / 1.50p	18.67	19.00	7.32	7.68	30	36	49
M14	27	2.00p	1.50p	21.67	22.00	8.62	8.98	34	40	53
M16	30	2.00p	1.50p	23.67	24.00	9.82	10.20	38	44	57
M18	34	2.50p	1.50p	26.67	27.00	11.28	11.70	42	48	61
M20	36	2.50p	1.50p / 2.00p	29.67	30.00	12.28	12.70	46	52	65
M22	41	2.50p	1.50p	31.61	32.00	13.78	14.20	50	56	69
M24	46	3.00p	2.00p	35.38	36.00	14.78	15.20	54	60	73
M27	50	3.00p	2.00p	40.00	41.00	16.65	17.40	60	66	79
M30	55	3.50p	2.00p	45.00	46.00	18.28	19.12	66	72	85
M33	65	3.50	N/A	49.00	50.00	20.58	21.42	72	78	91
M36	75	4.00p	N/A	53.80	55.00	22.08	22.92	78	84	97
M39	85	4.00p	N/A	58.80	60.00	24.58	25.42	84	90	103
M42	95	4.50p	N/A	63.10	65.00	25.58	26.42	90	96	109
M48	95	5.00p	N/A	73.10	75.00	29.58	30.42	102	108	121
M56	85	5.50p	N/A	82.80	85.00	34.50	35.50	N/A	124	137

Size	Spanner (mm)	Pitch		Width Across Flats (S)		Head Height (K)
Size	Spanner (mm)	Coarse	Fine	Min	Max	Min	Max
M6	16	1.00p	N/A	9.78	10.00	3.85	4.15
M8	18	1.25p	1.00p	12.73	13.00	5.15	5.45
M10	21	1.50p	1.25p	16.73	16.00 (ISO) / 17.00 (DIN)	6.22	6.58
M12	24	1.75p	1.25p / 1.50p	18.67	18.00 (ISO) / 19.00 (DIN)	7.32	7.68
M14	27	2.00p	1.50p	21.67	21.00 (ISO) / 22.00 (DIN)	8.62	8.98
M16	30	2.00p	1.50p	23.67	24.00	9.82	10.20
M18	34	2.50p	1.50p	26.67	27.00	11.28	11.70
M20	36	2.50p	1.50p / 2.00p	29.67	30.00	12.28	12.70
M22	41	2.50p	1.50p	31.61	34.00 (ISO) / 32.00 (DIN)	13.78	14.20
M24	46	3.00p	2.00p	35.38	36.00	14.78	15.20
M27	50	3.00p	2.00p	40.00	41.00	16.65	17.40
M30	55	3.50p	2.00p	45.00	46.00	18.28	19.12
M36	75	4.00p	N/A	53.80	55.00	22.08	22.92
M42	95	4.50p	N/A	63.10	65.00	25.58	26.42
M48	95	5.00p	N/A	73.10	75.00	29.58	30.42
M56	85	5.50p	N/A	82.80	85.00	34.50	35.50

Thread Size	Thread Pitch (TPI)		Major Diameter (in)		Head Height (in)		Across Flats (in)		Across Corners (in)		Thread Length (in)
Thread Size	UNC	UNF	Min	Max	Min	Max	Min	Max	Min	Max	L > 6	L ≤ 6
1/4"	20	28	0.2450	0.2500	0.163	0.150	0.428	0.438	0.488	0.505	1.000	0.750
5/16"	18	24	0.3065	0.3125	0.195	0.211	0.489	0.500	0.557	0.577	1.125	0.875
3/8"	16	24	0.3690	0.3750	0.226	0.243	0.551	0.562	0.628	0.650	1.250	1.000
7/16"	14	20	0.4305	0.4375	0.272	0.291	0.612	0.625	0.698	0.722	1.375	1.125
1/2"	13	20	0.4930	0.5000	0.302	0.323	0.736	0.750	0.840	0.866	1.500	1.250
9/16"	12	18	0.5545	0.5625	0.348	0.371	0.798	0.812	0.910	0.938	1.625	1.375
5/8"	11	18	0.6170	0.6250	0.378	0.403	0.922	0.938	1.051	1.083	1.750	1.500
3/4"	10	16	0.7410	0.7500	0.455	0.483	1.100	1.125	1.254	1.299	2.000	1.750
7/8"	9	14	0.8660	0.8750	0.531	0.563	1.285	1.312	1.465	1.516	2.250	2.000
1"	8	12	0.9900	1.0000	0.591	0.627	1.469	1.500	1.675	1.732	2.500	2.250
1-1/8"	7	12	1.1140	1.1250	0.658	0.718	1.631	1.688	1.859	1.949	2.750	2.500
1-1/4"	7	12	1.2390	1.2500	0.749	0.813	1.812	1.875	2.066	2.165	3.000	2.750
1-3/8"	6	12	1.3630	1.3750	0.810	0.878	1.994	2.062	2.273	2.382	3.250	3.000
1-1/2"	6	12	1.4880	1.5000	0.902	0.974	2.175	2.250	2.480	2.598	3.500	3.250
1-3/4"	5	12	1.7450	1.7500	1.036	1.100	2.400	2.500	2.800	2.900	3.750	3.500
2"	4.5	12	1.9900	2.0000	1.155	1.224	2.750	2.875	3.100	3.200	4.000	3.750

Thread Size	Thread Pitch (TPI)		Major Diameter (in)		Head Height (in)		Across Flats (in)		Across Corners (in)
Thread Size	UNC	UNF	Min	Max	Min	Max	Min	Max	Min	Max
1/4"	20	28	0.2450	0.2500	0.163	0.150	0.428	0.438	0.488	0.505
5/16"	18	24	0.3065	0.3125	0.195	0.211	0.489	0.500	0.557	0.577
3/8"	16	24	0.3690	0.3750	0.226	0.243	0.551	0.562	0.628	0.650
7/16"	14	20	0.4305	0.4375	0.272	0.291	0.612	0.625	0.698	0.722
1/2"	13	20	0.4930	0.5000	0.302	0.323	0.736	0.750	0.840	0.866
9/16"	12	18	0.5545	0.5625	0.348	0.371	0.798	0.812	0.910	0.938
5/8"	11	18	0.6170	0.6250	0.378	0.403	0.922	0.938	1.051	1.083
3/4"	10	16	0.7410	0.7500	0.455	0.483	1.100	1.125	1.254	1.299
7/8"	9	14	0.8660	0.8750	0.531	0.563	1.285	1.312	1.465	1.516
1"	8	12	0.9900	1.0000	0.591	0.627	1.469	1.500	1.675	1.732
1-1/8"	7	12	1.1140	1.1250	0.658	0.718	1.631	1.688	1.859	1.949
1-1/4"	7	12	1.2390	1.2500	0.749	0.813	1.812	1.875	2.066	2.165
1-3/8"	6	12	1.3630	1.3750	0.810	0.878	1.994	2.062	2.273	2.382
1-1/2"	6	12	1.4880	1.5000	0.902	0.974	2.175	2.250	2.480	2.598
1-3/4"	5	12	1.7450	1.7500	1.036	1.100	2.400	2.500	2.800	2.900
2"	4.5	12	1.9900	2.0000	1.155	1.224	2.750	2.875	3.100	3.200

Size	Pitch		Width Across Corners (min)	Height (K)		Width Across Flats (S)
Size	Coarse	Fine	Width Across Corners (min)	Min	Max	Min	Max
M1.6	0.35p	N/A	3.41	1.05	1.30	3.02	3.20
M2	0.40p	N/A	4.32	1.35	1.60	3.82	4.00
M2.5	0.45p	N/A	5.45	1.75	2.00	4.82	5.00
M3	0.50p	N/A	6.01	2.15	2.40	5.32	5.50
M4	0.70p	N/A	7.66	2.90	3.20	6.78	7.00
M5	0.80p	N/A	8.79	4.40	4.70	7.78	8.00
M6	1.00p	N/A	11.05	4.90	5.20	9.78	10.00
M8	1.25p	1.00p	14.38	6.44	6.80	12.73	13.00
M10	1.50p	1.25p	17.77	8.04	8.40	15.73	16.00
M12	1.75p	1.25p / 1.50p	20.03	10.37	10.80	17.73	18.00
M14	2.00p	1.50p	23.36	12.10	12.80	20.67	21.00
M16	2.00p	1.50p	26.75	14.10	14.80	23.67	24.00
M18	2.50p	1.50p	29.56	15.10	15.80	26.16	27.00
M20	2.50p	1.50p	32.95	16.90	18.00	29.16	30.00
M22	2.50p	1.50p	37.29	18.10	19.40	33.00	34.00
M24	3.00p	2.00p / 1.50p	39.55	20.20	21.50	35.00	36.00
M27	3.00p	N/A	45.20	22.50	23.80	40.00	41.00
M30	3.50p	N/A	50.85	24.30	25.60	45.00	46.00
M33	3.50p	N/A	55.37	27.40	28.70	49.00	50.00
M36	4.00p	N/A	60.79	29.40	31.00	53.80	55.00
M42	4.50p	N/A	71.30	32.40	34.00	63.10	65.00
M48	5.00p	N/A	82.60	36.40	38.00	73.10	75.00
M56	5.50p	N/A	93.56	43.40	45.00	82.80	85.00
M64	6.00p	N/A	104.86	49.10	51.00	92.80	95.00

Thread Diameter (D)	Pitch		Width Across Corners (min)	Nut Height Overall		Hex Height (min)	Width Across Flats
Thread Diameter (D)	Coarse	Fine	Width Across Corners (min)	Min	Max	Hex Height (min)	Min	Max
M3	0.50p	N/A	6.01	4.02	4.50	2.15	5.32	5.50
M4	0.70p	N/A	7.66	5.52	6.00	2.90	6.78	7.00
M5	0.80p	N/A	8.79	6.22	6.80	4.40	7.78	8.00
M6	1.00p	N/A	11.05	7.42	8.00	4.90	9.78	10.00
M8	1.25p	1.00p	14.38	8.92	9.50	6.44	12.73	13.00
M10	1.50p	1.25p	17.77	11.20	11.90	8.04	15.73	16.00
M12	1.75p	1.25p / 1.50p	20.03	14.20	14.90	10.37	17.73	18.00
M14	2.00p	1.50p	23.36	15.90	17.00	12.10	20.67	21.00
M16	2.00p	1.50p	26.75	17.80	19.10	14.10	23.67	24.00
M18 (DIN 985)	2.50p	1.50p	29.56	17.66	18.50	13.00	26.16	27.00
M20	2.50p	1.50p	32.95	20.70	22.80	16.90	29.16	30.00
M22 (DIN 985)	2.50p	1.50p	35.21	20.70	22.00	15.00	31.00	32.00
M24	3.00p	1.50p / 2.50p	39.55	25.00	27.10	20.20	35.00	36.00
M27 (DIN 985)	3.00p	2.00p	45.20	25.70	27.00	17.00	40.00	41.00
M30	3.50p	N/A	50.85	30.10	32.60	24.30	45.00	46.00
M33 (DIN 985)	3.50p	N/A	55.37	31.40	33.00	22.00	49.00	50.00
M36	4.00p	N/A	60.79	36.40	38.90	29.40	53.80	55.00
M42 (DIN 985)	4.50p	N/A	72.09	40.50	42.00	23.10	63.80	65.00

BOLTS & SCREWS

Screws can be classified according to Type, Shape Type, Groove Type.

FASTENER TYPES

Head Styles

Drive Types

Nut Types

Washer Types

Technical Resources - Fasteners

AS1110.1 High Tensile Metric Hex Bolts

Compliant with DIN 931/IS0 4014 Standards for Partially Threaded Hexagon Head Bolts

AS1110.2 High Tensile Metric Hex Set Screws

Compliant with DIN 933/IS0 4017 Standards for Fully Threaded Hexagon Head Bolts

AS2465 High Tensile Imperial Hex Bolts

Specifications for UNC and UNF High Tensile Partially Threaded Hexagon Head Bolts

AS2465 High Tensile Imperial Hex Set Screws

Specifications for UNC and UNF Fully Threaded High Tensile Hexagon Head Bolts

AS1112 Metric Hexagon Nuts

Compliant with AS1112/IS0 4032 Standards for Metric Hexagon Nuts

ISO 7040 Nylon Locking (Nyloc) Nuts

Compliant with AS 1214-1983/ISO 7040/DIN 985 Standards for Prevailing torque nuts with nonmetalic insert

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