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12 Point Flange Screw

Immediately place an order for the Xiaoguo® 12 Point Flange Screw in bulk. This product features a unique 12-point head design, and is made of 12.9-grade alloy steel that has undergone quenching and tempering processes, with an ultimate tensile strength exceeding 1200 MPa, which is suitable for use in heavy-duty parts of the engine.

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Product Description

The 12 Point Flange Screw is a high-performance fastener with a head featuring twelve corners and an enlarged flange support surface at the bottom. Its head shape adopts a double hexagonal design, combining the twelve-point drive and an integrated flange structure, specifically designed for high torque and resistance to vibration loosening.

This 12 Point Flange Screw is commonly used in automotive transmission systems, engine blocks, aircraft engines and high-strength industrial equipment. It is an ideal solution for replacing traditional hexagonal head bolts and internal hexagonal cylindrical head screws. The twelve-sided drive surface design allows the use of Ring spanner or twelve-sided sockets， enabling 30° repositioning operation in narrow spaces compared to standard hexagonal heads， resulting in higher installation efficiency.

12 Point Flange Screw

Core advantage

The core advantages of the 12 Point Flange Screw are mainly reflected in the following aspects:

（1）Twelve-point head type

More contact surfaces: The twelve-point head type has twice as many contact surfaces as the hexagonal head, enabling it to withstand higher tightening torque without damaging the head.

Sliding angle risk is low: The force distribution is more uniform, making it suitable for applications requiring high preload.

（2）Integrated Flange

Self-contained flange surface: No additional gaskets required. The serrated or embossed structure at the bottom of the flange cooperates with the surface of the workpiece, generating strong frictional force.

High vibration resistance: It can maintain the preload even in a vibrating environment, suitable for dynamic load areas.

（3）Easy installation, saves space

30°rotation: The twelve-point head can be rotated by 30° to insert into the wrench for repositioning. This saves half the space compared to the 60° rotation of the hexagonal head. Suitable for limited space.

（4）Large bearing area

The enlarged flange surface increases the contact area: effectively disperses pressure and prevents soft materials such as aluminum and cast iron from being deformed.

12 Point Flange Screw

Mon	M22	M24	M27	M30	M33	M36	M39	M42	M45	M48	M52
P	2.5	3	3	3.5	3.5	4	4	4.5	4.5	5	5
dc max	33.3	38.1	38.1	42.8	47.5	52.3	57	61.7	66.5	76	76
dc min	32.68	37.48	37.48	42.18	46.88	51.56	56.26	60.96	65.76	75.26	75.26
ds max	22	24	27	30	33.0	36	39	42.0	45.0	48	52
ds min	21.79	23.79	26.79	29.79	32.75	35.75	38.75	41.75	44.75	47.75	51.7
e min	25.4	27.7	27.7	34.6	36.90	41.60	47.30	47.30	53.10	57.70	57.70
h max	6.9	7.98	7.98	9.21	9.62	10.82	12.71	12.56	15.65	16.1	16.1
h min	6.54	7.35	7.35	8.78	9.19	10.39	12.28	12.13	15.13	15.58	15.58
k max	22.36	25.56	25.56	28.96	32.0	35.2	38.3	41.4	44.7	51.03	51.03
k min	22.04	25.24	25.24	28.54	31.6	34.80	37.90	41.00	44.30	50.57	50.57
r max	1	1.2	1.20	1.4	1.60	1.60	1.80	1.80	2.00	2.20	2.20
r min	0.75	0.95	0.95	1.15	1.35	1.35	1.55	1.55	1.75	1.82	1.82
s max	22	24	24	30	32.00	36.00	41.00	41.00	46.0	50.0	50.0
s min	21.79	23.79	23.79	29.79	31.75	35.75	40.75	40.75	45.75	49.75	49.75

（5）Alternative Hex Socket Screws

Head outer diameter compatibility: The 12 Point Flange Screw has the same hole size as the standard hexagonal cylindrical head screw, so it can be directly replaced without modifying the hole position, and it is also more durable.

（6）Complete range of high-strength grades

Covering 8.8 grade, 10.9 grade, 12.9 grade and stainless steel A2-70/A4-80, meeting the needs of all scenarios ranging from general machinery to extreme heavy loads.

（7）Rich corrosion-resistant solutions

Offer various surface treatments such as electro-galvanizing, hot-dip galvanizing, Dacromet coating, zinc-nickel alloy, and blackening, suitable for indoor, outdoor, marine, and chemical environments, etc.

（8）Wide range of application fields

Automobiles (engines, transmissions, chassis), aerospace (engine frames, landing gears), wind power, mining, petrochemicals, ships, general machinery, etc.