DIN 916 Hexagon Socket Set Screw

AGICO supplies DIN 616 hexagon socket set screw thread sizes ranging from M1.4 to M24 Bolt grade grades including 45H, A2, A4, C3, CU2, CU3, and AL4
Din 916 Internal Hex Socket Screw Sizes

What is DIN 916 Hexagon Socket Set Screw

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DIN 916 internal hexagon socket set screws, also known as headless screws, feature a recessed end with a normal internal hexagon socket. The screw’s end is concave, commonly referred to as internal hexagon socket set screws or internal hexagon socket stop screws. While internal hexagon socket set screws are generally used to fix the relative positions of 2 lightly loaded components, internal hexagon socket set screws with a recessed end provide enhanced reliability and can withstand greater forces.

internal hexagon socket set screw AGICO Supply

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dimensions table for DIN 916 internal hexagon socket set screws:

Thread specification dPitch Pdpdf ≈e minstminL
maxminNominalmaxmin
M1.40.30.70.45Thread diameter0.8030.70.7110.7240.61.42.5-6
M1.60.350.80.550.8030.70.7110.7240.71.52.5-6
M1.80.350.90.650.8030.70.7110.7240.81.62.5-6
M20.410.751.0030.90.8890.9020.81.73-10
M2.50.451.20.951.4271.31.271.2591.223-10
M30.51.41.151.731.51.521.5451.224-20
M40.721.752.322.022.0451.52.54-20
M50.82.52.252.872.52.522.56235-25
M6132.753.4433.023.0823.56-35
M81.2554.74.5844.024.095358-40
M101.565.75.7255.025.0954612-40
M121.7587.646.8666.026.0954.8816-40
M14298.646.8666.026.0955.69 
M162109.649.1588.0258.1156.41020-40
M182.51211.5711.431010.02510.1157.211 
M202.51413.5711.431010.02510.11581220-40
M222.51615.5713.721212.03212.142913.5 
M2431615.5713.721212.03212.142101530-60
Except for M1.4, M1.6, M1.8, M2, and M2.5, emin = 1.14Smin.
tmin denotes the minimum engagement depth for short screws and long screws.

Nominal length L range:

L
Nominalminmax
21.82.2
2.52.32.7
32.83.2
3.53.263.74
43.764.24
54.765.24
65.766.24
87.718.29
109.7110.29
1211.6512.35
1413.6514.35
1615.6516.35
1817.6518.35
2019.5820.42
2221.5822.42
2524.5825.42
2827.5828.42
3029.5830.42
3534.535.5
4039.540.5
4544.545.5
5049.550.5
5554.455.6
6059.460.6

Marking Method of DIN 916 hexagon socket set screw :

For a screw with thread specification d = M6, nominal length L = 12mm, performance grade 45H, and surface oxidation treatment, the marking for an internal hexagon socket set screw is:
Internal Hexagon Socket Set Screw DIN 916-M6x12

Material and Performance of DIN 916 Hex Socket Screws:

  • Materials for DIN 916: carbon steel, stainless steel, and non-ferrous metals.
  • Performance grade of screws and bolts: DIN 916 hex socket screw tensile strength, such as 4.8, 8.8, 10.9, etc., while the performance grade of set screws is indicated by hardness, divided into four grades: 14H, 22H, 33H, and 45H.

chemical composition of carbon steel internal hexagon socket set screws

Performance levelMaterial heat treatmentchemical composition% 
CPS
maxminmaxmax
45Halloy steelQuenched and tempered0.50.190.050.05

Mechanical properties of DIN 916 carbon steel internal hexagon socket set screws

Performance levelVickers hardness HV10Brinell hardness HBRockwell hardness HRCMinimum height Emin of non-decarburized layer of threadSurface hardness HV0.3
minmaxminmaxminmax
45H45056042853245533/4H1580

Guaranteed torque for carbon steel internal hexagon socket set screws: Carbon steel internal hexagon socket set screws also require surface treatment, which is the process of forming a covering layer on the surface of the workpiece through certain methods to enhance aesthetics and achieve corrosion resistance. Surface treatment methods include oxidation, electroplating, and non-electrolytic zinc plating.

Thread nominal diameter d345681012162024
Minimum length of test screw mm5668101216202530
Guaranteed torque Nm0.92.558.5204065160310520

stainless steel internal hexagon socket set screw chemical composition

The material used for stainless steel internal hexagon socket set screws is austenitic stainless steel, commonly SUS304 and SUS316. The chemical composition is as follows:

categoryMaterialchemical composition%
CSiMnPSCrMoNiCu
austenite
SUS3040.1120.050.0315~208~194
SUS3160.08120.0450.0316~18.52~310~151

The performance grades for stainless steel hexagon socket screws are divided into 2 categories, also indicated by hardness: 12H and 21H. 12H indicates that the minimum Vickers hardness for soft austenitic steel is 125HV, while 21H indicates that the minimum Vickers hardness for cold-worked austenitic steel is 210HV. The performance grade of stainless steel internal hexagon socket set screws is 21H.

Guaranteed torque for stainless steel internal hexagon socket set screws:

Thread nominal diameter d1.622.5345681012162024
Minimum length of test screw mm2.5345668101216202530
Guaranteed torque Nm0.050.10.30.421.42.85122442105210332

Applications of DIN 916 Internal Hexagon Socket Set Screws:

DIN 916 internal hexagon socket set screws are commonly used in applications where the screw head must not protrude, suitable for machinery with high hardness or frequent positional adjustments. Due to the ease of sinking into components and providing a smooth surface, internal hexagon socket set screws find wide applications in industries such as mechanical equipment, electronic devices, communication equipment, hardware lighting, various precision machinery and instruments, electronics, communication products, locks, and more.

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