DIN 931 Hex Head Bolts with Partially Threaded

What Is a DIN 931 Bolt?

DIN 931 is a German industrial standard that specifies hex head bolts with a threaded shank. These bolts are designed to enhance shear strength due to the smooth shank between the head and the threaded portion.

DIN 931 hexagonal head bolts are metric externally threaded fasteners with a hexagonal, chamfered head and a partially threaded shank. DIN 931 and DIN 933 (hexagonal head fully threaded bolts) are both commonly used German industrial standards. Beyond Fastener offers these fasteners in a variety of materials and finishes, available in both metric and inch sizes. Click on the link to view related products: hex head bolts.

Key Features

• Hexagonal head
• Partially threaded (unthreaded shank)
• Metric sizes (M1.6 to M160)
• Standardized dimensions and tolerances

DIN 931 vs DIN 933

Feature	DIN 931	DIN 933
Thread Type	Partial Thread	Full Thread
Strength Focus	Shear Strength	Clamping Force
Shank	Yes (unthreaded)	No
Application	Structural joints	General fastening
Standard Equivalent	ISO 4014	ISO 4017

DIN 931 Bolt Size Chart

Equivalent standard: ISO 4014.

Table 1: Dimensions

(mm)	P	da max	ds max	ds min	e min	k max	k min	r min	s max	s min
M1.6	0.35	2.0	1.6	1.46	3.41	1.22	0.98	0.10	3.20	3.02
M2	0.40	2.6	2.0	1.86	4.32	1.52	1.28	0.10	4.00	3.82
M2.5	0.45	3.1	2.5	2.36	5.45	1.82	1.58	0.10	5.00	4.82
M3	0.50	3.6	3.0	2.86	6.01	2.12	1.88	0.10	5.50	5.32
M3.5	0.60	4.1	3.5	3.32	6.58	2.52	2.28	0.10	6.00	5.82
M4	0.70	4.7	4.0	3.82	7.66	2.92	2.68	0.20	7.00	6.78
M5	0.80	5.7	5.0	4.82	8.79	3.65	3.35	0.20	8.00	7.78
M6	1.00	6.8	6.0	5.82	11.05	4.15	3.85	0.25	10.00	9.78
M7	1.00	7.8	7.0	6.78	12.12	4.95	4.65	0.25	11.00	10.73
M8	1.25	9.2	8.0	7.78	14.38	5.45	5.15	0.40	13.00	12.73
M10	1.50	11.2	10.0	9.78	18.90	6.58	6.22	0.40	17.00	16.73
M12	1.75	13.7	12.0	11.73	21.10	7.68	7.32	0.60	19.00	18.67
M14	2.00	15.7	14.0	13.73	24.49	8.98	8.62	0.60	22.00	21.67
M16	2.00	17.7	16.0	15.73	26.75	10.18	9.82	0.60	24.00	23.67
M18	2.50	20.2	18.0	17.73	30.14	11.72	11.28	0.60	27.00	26.67
M20	2.50	22.4	20.0	19.67	33.53	12.72	12.28	0.80	30.00	29.67
M22	2.50	24.4	22.0	21.67	35.72	14.22	13.78	0.80	32.00	31.61
M24	3.00	26.4	24.0	23.67	39.98	15.22	14.78	0.80	36.00	35.38
M27	3.00	30.4	27.0	26.48	45.20	17.35	16.65	1.00	41.00	40.00
M30	3.50	33.4	30.0	29.48	50.85	19.12	18.28	1.00	46.00	45.00
M33	3.50	36.4	33.0	32.38	55.37	21.42	20.58	1.00	50.00	49.00
M36	4.00	39.4	36.0	35.38	60.79	22.92	22.08	1.00	55.00	53.80
M39	4.00	42.4	39.0	38.38	66.44	25.42	24.58	1.00	60.00	58.80

Table 2: Dimensions

(mm)	P	da max	ds max	ds min	e min	k min	k max	r min	s max	s min
M68	6	75	68	67.26	110.51	42.5	43.5	2.0	100	97.8
M72	6	79	72	71.26	116.16	44.5	45.5	2.0	105	102.8
M76	6	83	76	75.26	121.81	47.5	48.5	2.0	110	107.8
M80	6	87	88	79.26	127.46	49.5	50.5	2.0	115	112.8
M90	6	97	90	89.13	144.08	56.4	57.6	2.5	130	127.5
M100	6	107	100	99.13	161.02	62.4	63.6	2.5	145	142.5
M110	6	117	110	109.13	172.32	68.4	69.6	2.5	155	152.5
M125	6	132	125	124.00	200.57	78.4	79.6	2.5	180	177.5
M140	6	147	140	139.00	220.80	87.3	88.7	2.5	200	195.4
M160	8	167	160	159.00	254.70	99.3	100.7	2.5	230	225.4

How to Choose DIN 931 Bolts?

Load

• Select the appropriate grade (8.8 / 10.9 / 12.9)

Environment

• Choose a corrosion-resistant coating or stainless steel

Applications

• Structure → DIN 931
• General Fasteners → DIN 933

Size and Length

• Ensure that the threads are properly engaged and that the shank is the correct length

Applications of DIN 931 Bolts

Architecture and Steel Structures

• Structural Connections
• Bridges and Buildings
• Load-bearing Frames

Automotive Industry

• Engine Components
• Suspension System
• Chassis Components

Heavy Machinery

• Industrial Equipment
• Mining Machinery
• Agricultural Machinery

Oil and Gas

• Pipeline Systems
• Drilling Equipment
• Offshore Platforms

Renewable Energy

• Wind Turbine Components
• Solar Installation Systems

Why Choose Us as Your DIN 931 Bolt Supplier

• Manufactured to ISO, DIN, and ASTM standards
• Available in various sizes and grades
• Rigorous quality control
• Highly competitive factory prices
• Fast global shipping
• Custom solutions available

FAQ

What is a DIN 931 bolt?

DIN 931 is a standard for partially threaded hex head bolts designed for structural and high-load applications.

What is the difference between DIN 931 and DIN 933?

DIN 931 has a partial thread and a smooth shank, whereas DIN 933 has a full thread.

Are DIN 931 bolts high-strength bolts?

Yes, especially in grades 8, 9, and 10.

What standard is DIN 931 equivalent to?

DIN 931 is equivalent to ISO 4014.