DIN 914 Dimensions

Technical Summary of DIN 914: Hexagon Socket Set Screws with Cone Point

Standard: DIN 914 (December 1980), a modified national adoption of ISO 4027:1977.
Product: Grade A hexagon socket set screws with a cone (pointed) end.
Application: For precise positional locking where the cone point engages with a matching center hole or indentation in the mating part.
Scope: Covers metric screw threads from M1.4 up to and including M24. Sizes in parentheses (e.g., M1.8, M14, M22) should be avoided where possible.

Thread Sizes: M1.4, M1.6, (M1.8), M2, M2.5, M3, M4, M5, M6, M8, M10, M12, (M14), M16, (M18), M20, (M22), M24.
Cone Point Diameter (d_t): Specified with max and min values for thread sizes M6 and larger. A key change from the previous edition; see Important Notes.
Socket Size (s): Nominal hexagon key size (e.g., 1.5 for M3, 3 for M6, 10 for M20) with min/max tolerances.
Socket Depth (t): Minimum depth specified. For very short screws (above the dotted stepped line), the depth is reduced, and reduced tightening capability must be considered.
Cone Angle: Varies by length:
- Short screws (lengths above dotted line): Cone angle is 120°.
- Longer screws (lengths below dotted line): Cone angle is 90°.
Nominal Length (l): Ranges from 2 mm to 60 mm (depending on thread size), provided with min/max limits.
Weights: Provided per 1000 pieces for reference (based on 7.85 kg/dm³ density).

Steel: Primary material.
- Strength/Hardness Category: Standard category is 45H (as per DIN ISO 898 Part 5).
- Other Categories: Other categories (e.g., 22H) can be supplied upon request and must be specified in the designation.
Stainless Steel:
- Grades: A2 (304 type), A4 (316 type), C3.
- Strength Class: For A2, A2-70 for sizes ≤ M20, A2-50 for sizes > M20.
Non-Ferrous Metal: Materials according to DIN 267 Part 18 (no specific alloy specified for set screws in this standard).
Thread Tolerance:
- Steel, category 45H: 5g6g
- All other materials/categories: 6g
Product Grade: A.

General Requirements: According to DIN 267 Part 1.
Surface Finish:
- Steel: Thermally or chemically blackened (black oxide).
- Stainless Steel & Non-Ferrous: Bright (plain).
- Electroplating or other coatings can be agreed upon at the time of order (ref. DIN 267 Part 9).
Acceptance Inspection: According to DIN 267 Part 5.

Standard Designation: Set screw DIN 914 – M6 × 12 – 45H
- d = M6
- l = 12 mm
- 45H = Strength category
For Product Grade F (Precision, sizes ≤ M2.5 only): Add "- F" (e.g., Set screw DIN 914 – M2 × 4 – 45H – F).
Alternative ISO Designation (for international communication): Set screw ISO 4027 – M6 × 12 – 45H (Note: Only applies to non-shaded, pure ISO specifications in the standard).

Cone Diameter Change: This edition modified the cone point diameters (d_t) for sizes M6 and larger compared to the 1973 edition (see comparison table on page 5). While general interchangeability is maintained, individual case review is recommended.
This DIN standard includes national amendments/additions to ISO 4027, including additional sizes and the allowance for strength categories other than 45H.
For sizes up to M2.5, a higher precision Product Grade F (per DIN 267 Part 6) is available for precision engineering applications.
The cone point design is ideal for applications requiring precise alignment and positive location against a prepared center hole.

DIN 914 Hexagon Socket Set Screws with Cone Point - Dimensions (mm)
Parameter	Description	Type	M1.4	M1.6	(M1.8)
DIN 914 Hexagon socket set screws with cone point - DIN 914 dimensions (mm)

Screw Thread			M1.4	M1.6	(M1.8)
d			M1.4	M1.6	(M1.8)
P	Pitch		0.3	0.35	0.35
dt	max		-	-	-
dt	min		-	-	-
e	min		0.803	0.803	0.803
s	Nominal Size		0.7	0.7	0.7
	max		0.724	0.724	0.724
	min		0.711	0.711	0.711
t	min	short	0.6	0.7	0.8
t	min	long	1.4	1.5	1.6

DIN 914 Hexagon Socket Set Screws with Cone Point - Dimensions (mm)
Parameter	Description	Type	M2	M2.5	M3
DIN 914 Hexagon socket set screws with cone point - DIN 914 dimensions (mm)

Screw Thread			M2	M2.5	M3
d			M2	M2.5	M3
P	Pitch		0.4	0.45	0.5
dt	max		-	-	-
dt	min		-	-	-
e	min		1.003	1.427	1.73
s	Nominal Size		0.9	1.3	1.5
	max		0.902	1.295	1.545
	min		0.889	1.27	1.52
t	min	short	0.8	1.2	1.2
t	min	long	1.7	2	2

DIN 914 Hexagon Socket Set Screws with Cone Point - Dimensions (mm)
Parameter	Description	Type	M4	M5	M6
DIN 914 Hexagon socket set screws with cone point - DIN 914 dimensions (mm)

Screw Thread			M4	M5	M6
d			M4	M5	M6
P	Pitch		0.7	0.8	1
dt	max		-	-	1.5
dt	min		-	-	0.9
e	min		2.3	2.87	3.44
s	Nominal Size		2	2.5	3
	max		2.045	2.56	3.08
	min		2.02	2.52	3.02
t	min	short	1.5	2	2
t	min	long	2.5	3	3.5

DIN 914 Hexagon Socket Set Screws with Cone Point - Dimensions (mm)
Parameter	Description	Type	M8	M10	M12
DIN 914 Hexagon socket set screws with cone point - DIN 914 dimensions (mm)

Screw Thread			M8	M10	M12
d			M8	M10	M12
P	Pitch		1.25	1.5	1.75
dt	max		2	2.5	3
dt	min		1.4	1.9	2.4
e	min		4.58	5.72	6.86
s	Nominal Size		4	5	6
	max		4.095	5.095	6.095
	min		4.02	5.02	6.02
t	min	short	3	4	4.5
t	min	long	5	6	8

DIN 914 Hexagon Socket Set Screws with Cone Point - Dimensions (mm)
Parameter	Description	Type	(M14)	M16	(M18)
DIN 914 Hexagon socket set screws with cone point - DIN 914 dimensions (mm)

Screw Thread			(M14)	M16	(M18)
d			(M14)	M16	(M18)
P	Pitch		2	2	2.5
dt	max		4	4	5
dt	min		3.25	3.25	4.25
e	min		6.86	9.15	11.43
s	Nominal Size		6	8	10
	max		6.095	8.115	10.115
	min		6.02	8.025	10.025
t	min	short	5.6	6.4	7.2
t	min	long	9	10	11

DIN 914 Hexagon Socket Set Screws with Cone Point - Dimensions (mm)
Parameter	Description	Type	M20	(M22)	M24
DIN 914 Hexagon socket set screws with cone point - DIN 914 dimensions (mm)

Screw Thread			M20	(M22)	M24
d			M20	(M22)	M24
P	Pitch		2.5	2.5	3
dt	max		5	6	6
dt	min		4.25	5.25	5.25
e	min		11.43	13.72	13.72
s	Nominal Size		10	12	12
	max		10.115	12.142	12.142
	min		10.025	12.032	12.032
t	min	short	8	9	10
t	min	long	12	13.5	15