DIN 912 Socket Head Cap Screw Technical Datasheet

DIN 912 Hexagon Socket Head Cap Screw (Allen Cap Screw)

DIN 912 Socket Head Cap Screws also known has Allen Cap Screws are precision-engineered high-strength fasteners featuring a cylindrical head with an internal hexagon (Allen) drive. They are widely used where high clamping force, compact head design, and easy installation in confined spaces are required.

DIN 912 screws are commonly manufactured in property class 12.9 alloy steel, stainless steel A2-70 and A4-70/A4-80, and titanium. Although DIN 912 has officially been superseded by ISO 4762, both standards remain interchangeable for most industrial applications and continue to be widely specified worldwide.

These screws are extensively used in machine building, automation, tooling, robotics, electronics, automotive assemblies, aerospace equipment, medical devices, and precision engineering applications.

Dimensions

Thread D x Pitch	M1.6 x 0.35	M2 x 0.4	M2.5 x 0.45	M3 x 0.5	M4 x 0.7	M5 x 0.8	M6 x 1.0	M8 x 1.25	M10 x 1.5	M12 x 1.75	M14 x 2.0	M16 x 2.0	M18 x 2.5	M20 x 2.5	M24 x 3.0
Dk	3	3.8	4.5	5.5	7	8.5	10	13	16	18	21	24	27	30	36
K	1.6	2	2.5	3	4	5	6	6	10	12	14	16	18	20	24
SW	1.5	1.5	2	2.5	3	4	5	6	8	10	12	14	14	17	19

all dimensions in mm

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Dimensions

d1	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	M14	M16	M20
d2	3.8	4.5	5.5	7	8.5	10	13	16	18	21	24	30
b	16	17	18	20	22	24	28	32	36	40	44	52
k	2	2.5	3	4	5	6	8	10	12	14	16	20
s	1.5	2	2.5	3	4	5	6	8	10	12	14	17
t min	1	1.1	1.3	2	2.5	3	4	5	6	7	8	10

Dimensions Tolerances:
General dimensional tolerances for standard metric fasteners—including thread diameter, overall length, head diameter, head height/thickness, across flats, and washer dimensions—are available in our Standard Dimensional Tolerances for Common Metric Fasteners guide.

Certain product-specific features, such as drive recess dimensions, socket depth, countersink geometry, under-head radii, and other special characteristics, are governed by the applicable DIN or ISO product standard and may not included in this datasheet.

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Mechanical Properties

Material / Property Class	Tensile Strength	Yield Strength	Standard
Steel 10.9	≥ 1,040 MPa	≥ 940 MPa	ISO 898-1
Steel 12.9	≥ 1,220 MPa	≥ 1,100 MPa	ISO 898-1
Stainless Steel A2-70	≥ 700 MPa	≥ 450 MPa	ISO 3506-1
Stainless Steel A4-70	≥ 700 MPa	≥ 450 MPa	ISO 3506-1
Stainless Steel A4-80	≥ 800 MPa	≥ 600 MPa	ISO 3506-1
Titanium Grade 2	Approx. 345 MPa	Approx. 275 MPa	ASTM B348
Titanium Grade 5	Approx. 895 MPa	Approx. 828 MPa	ASTM B348

Material Characteristics and Recommended Applications

Material	Characteristics	Typical Applications
Alloy Steel Class 12.9	Extremely high tensile strength, wear resistant	Machine tools, moulds, industrial machinery
Stainless Steel A2-70	Good corrosion resistance	Food processing, electronics, general industry
Stainless Steel A4-70	Excellent corrosion resistance	Marine, offshore, chemical plants
Titanium Grade 2	Lightweight, corrosion resistant	Medical, aerospace, chemical processing
Titanium Grade 5	Very high strength-to-weight ratio	Aerospace, motorsports, defence
Aluminium	Lightweight and corrosion resistant	Electronics, lightweight assemblies

Technical Specifications

Property	Specification
Standard	DIN 912
ISO Equivalent	ISO 4762
Head Style	Cylindrical Socket Head
Drive Type	Hexagon Socket (Allen)
Thread Type	Metric Coarse Thread
Thread Direction	Right Hand
Thread Style	Fully Threaded (short lengths may have thread limitations depending on size)
Sizes Available	M1.6 – M64 (depending on manufacturer)
Length Range	2 mm – 500 mm
Product Grade	A
Strength Class	12.9, A2-70, A4-70, A4-80
Finish Options	Plain, Black Oxide, Zinc Plated, Hot Dip Galvanized (special), Zinc Flake, Nickel Plated
RoHS Compliant	Yes (selected finishes)
REACH Compliant	Yes

DIN 912 Socket Head Cap Screw Weight Chart

Weight in kgs. per 1,000 pcs. All weights are approximations.

Diameter	M2	M2.5	M3	M4	M5	M6	M8	M10	M12	M14	M16	M18	M20	M24
3	0.155
4	0.175	0.345
5	0.195	0.375	0.7
6	0.215	0.405	0.7	1.5
8	0.255	0.465	0.8	1.7	2.5
10	0.295	0.525	0.9	1.8	2.7	4.7
12	0.355	0.585	1	2	3	5.1	10.9
16	0.415	0.705	1.2	2.3	3.5	5.8	12.1	20.9
20	0.495	0.825	1.4	2.7	4	6.5	13.4	22.9	32.1
25		0.975	1.6	3.2	4.8	7.6	15	25.4	35.7	48	71.3
30			1.9	3.7	5.6	8.3	16.9	27.9	39.3	53	77.8	111	128
35				4.2	6.3	9.9	18.9	30.4	42.9	58	84.4	120	139
40				4.7	7.1	11	20.9	32.9	46.5	63	91	129	150	270
45					7.9	12.1	22.9	36.1	50.1	68	97.6	138	161	285
50					8.6	13.2	24.9	39.3	54.5	73	106	147	172	300
55						14.3	26.9	42.5	58.9	78	114	156	183	316
60						15.4	28.9	45.7	63.4	84	122	165	194	330
65							31	48.9	67.8	90	130	174	205	345
70							33	52.1	71.3	96	138	183	216	363
80							37	58.5	80.2	108	154	203	241	399
90								64.9	89.1	120	170	223	266	435
100								71.2	98	132	186	243	291	471
110									107	144	202	263	316	507
120									116	156	218	283	341	543
130										168	234	303	366	579
140										180	250	323	391	615
150											266	343	416	651
160											282	363	441	687
180												403	491	759
200													541	831
220														903
240														975

Fully Threaded vs. Partially Threaded DIN 912 Screws

Both fully threaded and partially threaded DIN 912 socket head cap screws are available in the market. The choice depends on the application, material, and manufacturer.

Fully Threaded	Partially Threaded
Threads run the entire length of the shank.	A plain shank is provided between the head and threaded portion.
Maximum thread engagement.	Better shear strength due to the unthreaded shank.
Suitable when clamping thinner components or where full thread engagement is required.	Preferred where the screw is subjected to transverse loads or where precise alignment is important.
Commonly supplied in stainless steel in the Indian market, even for longer lengths.	More commonly available in alloy steel (Class 12.9) from many manufacturers.

Applications

DIN 912 Socket Head Cap Screws are commonly used in:

• Machine tools
• Industrial automation
• Robotics
• CNC machines
• Tool and die manufacturing
• Hydraulic equipment
• Pneumatic systems
• Electric motors
• Medical equipment
• Aerospace assemblies
• Automotive manufacturing
• Industrial fixtures
• Electronics enclosures
• Printing machinery
• Packaging equipment

Advantages

• High clamping force due to internal hex drive
• Compact cylindrical head suitable for recessed installations
• Ideal where external wrench clearance is limited
• Excellent torque transmission with minimal risk of cam-out
• Available in high-strength property class 12.9
• Suitable for precision machinery and tooling
• Wide availability in corrosion-resistant stainless steel grades
• Compatible with automated assembly systems
• Available in numerous materials and finishes
• Standardized dimensions ensure global interchangeability

Frequently Asked Questions

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