Steel Straight Bevel Gears Ratio 1:1 – 4:1 Straight Tooth System

Steel straight bevel gears with ratios from 1:1 to 4:1 are conical gears designed to transmit power between intersecting shafts, typically at a 90-degree angle. The straight tooth system features teeth cut parallel to the cone’s generators, resembling spur gears but conical in shape. The gear ratio, ranging from 1:1 (equal teeth on both gears, as in miter gears) to 4:1 (driven gear has four times the teeth of the pinion), determines speed and torque changes.

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For example, a 4:1 ratio reduces speed but increases torque fourfold. Made from materials like carbon or alloy steel (e.g., C45), these straight bevel gears are heat-treated for durability. They’re cost-effective, simple to manufacture, and ideal for low-speed, low-load applications like differential drives, but abrupt tooth engagement increases noise and limits high-speed use.

Steel Straight Bevel Gears

Steel Straight Bevel Gear Ratio 1.25:1

Module	Number of teeth	da	d	ND	NL	L1	L	S	b	BH7	E	Torque*	Weight
Module	Number of teeth	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
3	16	52,9	48	40	11,7	27	29,2	16,9	17	15	45	5,2	220
3	20	63,9	60	40	10,0	25	27,8	18,4	17	15	40	6,5	300
4	16	70,6	64	50	12,5	32	36,5	20,6	22	20	58	12,7	470
4	20	85,2	80	50	15,0	33	38,4	26,3	22	20	55	15,9	700
5	16	88,2	80	60	12,0	40	44,2	23,3	29	20	70	25,4	910
5	20	106,6	100	60	15,0	39	45,0	29,1	29	25	65	31,8	1300

Steel Straight Bevel Gear Ratio 1.5:1

Module	Number of teeth	da	d	ND	NL	L1	L	S	b	BH7	E	Torque*	Weight
Module	Number of teeth	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
0,5	20	11,0	10	8	3,5	6,5	7,1	4,7	3	4	11,9	0,014	2
0,5	30	15,4	15	10	4,0	6,0	7,0	5,4	3	4	10,1	0,021	4
1	16	18,1	16	13	6,9	11	12,0	8,7	4,3	5	20	0,066	10
1	24	24,8	24	20	8,8	13	14,8	12,6	4,3	5	20	0,099	32
1,5	16	27,1	24	20	8,7	14	16,1	11,0	6,5	8	28	0,023	34
1,5	24	37,2	36	20	12,0	17	20,2	16,9	6,5	10	28	0,035	55
1,5	20	33,1	30	20	9,0	17	18,9	12,5	8,1	8	34	0,43	52
1,5	30	46,2	45	30	12,0	20	22,1	17,9	8,1	10	32	0,65	133
2	16	35,5	32	20	8,0	21	22,6	13,1	12	10	36	0,57	60
2	24	50,3	48	30	8,0	18	21,5	15,7	12	10	30	0,86	151
2	20	43,5	40	30	7,5	20	22,3	11,2	14	10	40	1,15	119
2	30	62,3	60	40	15,0	25	28,7	21,7	14	15	40	1,73	301
2,5	16	44,3	40	30	11,7	26	28,2	16,4	14	10	45	3,3	150
2,5	24	62,9	60	30	12,0	26	29,4	22,1	14	10	40	5,0	300
2,5	20	54,3	50	30	10,0	27	30,2	16,0	18	10	52	6,8	230
2,5	30	77,9	75	50	14,0	27	31,1	22,2	18	15	45	10,2	550
3	16	53,2	48	40	13,2	30	32,7	17,7	19	15	52	5,9	250
3	24	75,5	72	50	8,0	24	27,8	18,6	19	15	40	8,9	490
3	20	65,2	60	40	10,0	33	35,8	16,8	24	15	60	12,4	390
3	30	93,5	90	50	15,0	33	37,6	25,7	24	20	53	18,6	860
4	16	71,0	64	50	12,5	36	38,9	19,3	25	20	65	14,3	500
4	24	100,7	96	60	12,0	31	35,6	23,5	25	20	52	21,5	1010
4	20	87,0	80	50	18,0	48	51,1	27,3	30	20	85	29,5	950
4	30	124,6	120	60	18,0	40	46,4	31,5	30	25	68	44,3	1900
5	20	108,7	100	60	12,0	50	54,7	22,9	40	25	95	60,6	1630
5	30	155,8	150	70	12,0	40	46,3	26,4	40	30	72	90,9	3070

Steel Straight Bevel Gear Ratio 2:1

Module	Number of teeth	da	d	ND	NL	L1	L	S	b	BH7	E	Torque*	Weight
Module	Number of teeth	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
0,5	20	11,2	10	8	4,0	7,0	7,5	5,0	3	4	14,65	0,017	2
0,5	40	20,3	20	12	5,0	7,5	8,4	7,1	3	4	11,83	0,034	8
1	15	17,4	15	13	6,5	11	11,9	7,6	5	5	22	0,063	10
1	30	30,6	30	20	9,0	13	15,1	13,1	5	5	20	0,126	40
1,5	15	26,1	22,5	18	6,5	13	14,8	8,4	7,6	8	30	0,22	26
1,5	30	45,9	45	30	12,0	18	20,7	17,6	7,6	10	28	0,44	124
1,5	20	33,6	30	20	9,5	19	21,6	12,9	10,1	8	42	0,54	59
1,5	40	60,9	60	40	12,0	19	22,0	17,9	10,1	15	32	1,08	234
2	15	33,7	30	20	7,5	22	23,0	10,9	14	10	40	0,59	58
2	30	61,8	60	40	12,0	24	27,2	21,9	14	15	35	1,18	312
2	20	43,7	40	30	7,5	22	24,0	10,9	15	10	50	1,4	132
2	40	81,8	80	50	18,0	29	32,8	26,9	15	20	45	2,8	593
2,5	15	42,2	37,5	30	15,6	31	33,3	18,6	17	10	55	3,4	160
2,5	30	77,3	75	50	10,0	24	28,1	21,6	17	15	38	6,8	530
2,5	20	54,6	50	30	14,0	34	36,6	19,2	20	10	68	4,3	280
2,5	40	102,3	100	60	15,0	29	33,3	25,3	20	25	48	8,6	970
3	15	50,6	45	30	11,5	33	35,4	16,4	22	10	60	6,1	270
3	30	92,8	90	50	10	26	30,7	22,3	22	20	42	12,2	750
3	20	65,6	60	40	10	33	36,1	14,4	25	15	73	15,2	450
3	40	122,8	120	60	18	34	38,7	28,8	25	25	56	30,4	1400
4	15	67,5	60	40	10	38	41,0	16,9	28	20	75	14,6	410
4	30	123,8	120	60	15	33	39,4	28,8	28	25	55	29,2	1600
4	20	87,4	80	50	13	45	48,0	21,9	30	20	100	35,0	970
4	40	163,7	160	80	20	40	45,7	33,7	30	30	70	70,0	3300
5	15	84,4	75	60	15	50	54,1	21,4	38	20	94	30,2	980
5	30	154,7	150	70	15	40	46,7	32,2	38	30	65	60,4	3030
5	20	109,3	100	60	18	58	62,1	27,3	40	25	125	72,4	1890
5	40	204,7	200	90	20	48	55,6	39,7	40	35	85	144,8	6480
6	20	130,7	120	70	15	58	67	23,6	50	30	139,9	130,0	2960
6	40	245,3	240	100	20	50	58	37,7	50	40	92,3	260,0	9610

Steel Straight Bevel Gear Ratio 2.5:1

Module	Number of teeth	da	d	ND	NL	L1	L	S	b	BH7	E	Torque*	Weight
Module	Number of teeth	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
0,5	20	11,3	10	8	4,0	7	7,6	4,9	3	4	17,1	0,018	3
0,5	50	25,2	25	14	5,0	7	7,8	6,8	3	4	11,5	0,045	10
1	16	18,6	16	13	7,4	13	14,4	8,5	6,5	5	28	0,090	13
1	40	40,5	40	25	9,0	13	14,8	12,6	6,5	8	20	0,225	65
1,5	16	27,9	24	18	8,8	18	19,5	10,8	9,7	8	40	0,32	36
1,5	40	60,7	60	40	10,0	17	20,1	16,9	9,7	15	28	0,80	220
1,5	18	30,9	27	20	10,8	21	22,9	13,0	10,9	8	46	0,47	54
1,5	45	68,2	67,5	50	12,0	20	24,1	20,4	10,9	15	33	1,18	370
2	16	35,9	32	20	9,0	25	26,4	12,7	15	10	52	0,84	76
2	40	81,5	80	50	15,0	29	32,7	27,9	15	20	42	2,10	650
2	18	39,8	36	30	11,8	26	27,4	13,8	15	10	58	1,18	133
2	45	91,5	90	60	18,0	30	33,8	28,9	15	25	45	2,95	830
2,5	16	44,8	40	30	13,0	32	34,1	15,9	20	10	65	5,0	180
2,5	40	101,9	100	60	15,0	29	33,8	27,4	20	25	45	12,5	1000
2,5	18	49,8	45	30	15,75	36	37,9	19,7	20	10	75	7,1	240
2,5	45	114,4	112,5	70	15,0	28	33,4	26,9	20	25	47	17,8	1200
3	16	53,8	48	40	13,6	37	38,8	16,1	25	15	75	9,0	310
3	40	122,3	120	60	16,0	32	36,8	28,9	25	25	50	22,5	1400
3	18	59,8	54	40	11,7	36	38,4	15,7	25	15	82	12,8	380
3	45	137,3	135	70	18,0	34	39,0	30,9	25	30	55	32,0	1900
4	16	71,8	64	50	12,0	41	43,8	16,5	30	20	95	20,9	600
4	40	163,1	160	80	20,0	40	46,4	36,9	30	30	65	52,3	3400
4	18	79,7	72	50	13,8	44	46,8	19,5	30	20	108	29,3	800
4	45	183,0	180	90	20,0	43	49,6	39,9	30	30	72	73,3	4900
5	18	99,6	90	60	16,5	57	60,8	24,4	40	25	135	61,0	1560
5	45	228,8	225	100	20,0	50	57,8	44,8	40	40	85	152,5	9080

Steel Straight Bevel Gear Ratio 3:1

Module	Number of teeth	da	d	ND	NL	L1	L	S	b	BH7	E	Torque*	Weight
Module	Number of teeth	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
0,5	15	8,0	7,5	6	3,7	6,5	7,0	4,3	3	3	15,3	0,009	1
0,5	45	22,7	22,5	12	5,0	7,5	8,4	7,5	3	4	11,0	0,027	10
1	15	17,7	15	13	9,2	16	16,5	10,0	7,1	5	32	0,086	14
1	45	45,4	45	25	10	15	17,0	15,1	7,1	8	22	0,258	92
1,5	16	28	24	18	11	22	23,2	12,7	11,4	8	48	0,38	42
1,5	48	72,6	72	50	12	20	24,1	20,8	11,4	15	32	1,14	405
2	16	35,9	32	20	10	25	26,6	12,6	15	10	60	0,92	80
2	48	97,3	96	60	18	30	35,0	31,0	15	25	45	2,76	950
2,5	16	44,9	40	30	15,35	34	36,5	17,8	20	10	77	5,6	200
2,5	48	121,6	120	80	15	29	33,9	28,5	20	25	46	16,8	1600
3	16	53,9	48	40	12,5	36	38,3	15,0	25	15	86	10,0	310
3	48	145,9	144	70	18	34	38,7	32,0	25	30	53	30,0	2300
4	16	71,8	64	50	17	46	48,3	20,3	30	20	115	22,9	680
4	48	194,6	192	90	20	43	50,0	41,9	30	30	70	68,7	5700
5	15	84,9	75	60	15	53	56,4	19,1	40	20	130	39,3	1110
5	45	228,3	225	100	20	45	53,1	42,4	40	40	75	117,9	7920
5	16	89,8	80	60	16,5	55	59,0	21,6	40	20	140	47,7	1310
5	48	243,2	240	100	20	47	55,7	44,9	40	40	80	143,1	9640
6	15	101,4	90	70	20	67	73	26,2	50	30	159,2	70,7	1880
6	45	273,8	270	100	30	60	69	55,0	50	45	94,3	212,1	13170

Steel Straight Bevel Gear Ratio 3.5:1

Module	Number of teeth	da	d	ND	NL	L1	L	S	b	BH7	E	Torque*	Weight
Module	Number of teeth	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
1	16	18,7	16	13	7,6	16	16,6	8,4	8,7	5	36	0,127	16
1	56	56,3	56	30	10,0	14	16,7	14,6	8,7	8	22	0,445	130
1,5	16	28,1	24	18	12,2	24	26	13,6	13,1	8	55	0,45	48
1,5	56	84,5	84	50	12	24	27,1	23,8	13,1	15	35	1,58	634
2	16	35,9	32	20	10	25	26,8	12,5	15	10	68	0,99	82
2	56	113,1	112	60	18	31	35,5	31,9	15	25	46	3,47	1200
2,5	16	44,9	40	30	16,5	36	37,7	18,7	20	10	88	6,0	220
2,5	56	141,4	140	80	18	32	37,2	32,4	20	25	50	21,0	2300
3	16	53,9	48	40	15	39	40,6	16,8	25	15	100	10,9	340
3	56	169,7	168	80	18	33	39,8	34,0	25	30	55	38,2	3100
4	16	71,9	64	50	13	42	44,6	16,1	30	20	127	24,7	660
4	56	226,3	224	90	20	40	49,0	42,0	30	30	70	86,5	6900

Steel Straight Bevel Gear Ratio 4:1

Module	Number of teeth	da	d	ND	NL	L1	L	S	b	BH7	E	Torque*	Weight
Module	Number of teeth	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	Ncm	g
1	15	17,8	15	13	7,7	17,3	17,3	8,4	9,3	5	38	0,117	15
1	60	60,3	60	30	10,0	15	17,1	15,1	9,3	8	22	0,468	160
1,5	15	26,7	22,5	18	14,45	28	28,9	15,5	13,9	8	60	0,41	42
1,5	60	90,4	90	50	12,0	25	27,6	24,6	13,9	15	35	1,64	745
2	15	34,0	30	20	13,5	29	29,9	15,5	15	10	75	1,02	80
2	60	120,9	120	60	20,0	35	40,1	37,0	15	25	50	4,08	1600
2,5	15	42,5	37,5	30	16,1	35	36,8	17,6	20	10	92	5,3	190
2,5	60	151,2	150	80	18,0	33	37,8	33,8	20	25	50	21,2	2600
3	15	51,0	45	30	13,15	38	39,7	15,7	25	10	105	9,6	270
3	60	181,5	180	80	18,0	35	40,6	35,5	25	30	55	38,4	3800
4	15	68,0	60	40	12,5	43	44,8	16,0	30	20	135	21,7	520
4	60	242,0	240	90	20,0	41	50,1	44,0	30	30	70	86,8	8300

Steel Straight Bevel Gear Design Features

Conical Geometry
Steel straight bevel gears have a conical shape, allowing power transmission between intersecting shafts, typically at 90 degrees. The geometry ensures efficient torque transfer, with teeth cut straight along the cone’s surface, resembling spur gears but adapted for angular motion.
Straight Tooth Configuration
The teeth are cut parallel to the cone’s generators, creating a straightforward, cost-effective design. This configuration simplifies manufacturing and maintenance but results in abrupt tooth engagement, leading to higher noise levels compared to spiral bevel gears, especially in high-speed applications.
Material Strength
Typically made from high-strength carbon or alloy steels like C45 or 4140, these straight bevel gears undergo heat treatment (e.g., quenching or case hardening) to enhance durability. This ensures resistance to wear and fatigue, making them suitable for demanding industrial applications.
Gear Ratios (1:1 to 4:1)
The steel bevel gears support ratios from 1:1 (equal teeth, as in miter gears) to 4:1 (driven gear has four times the teeth). This range allows flexibility in adjusting speed and torque, critical for applications like differential systems or machinery drives.
Load Distribution
Straight teeth engage fully across their width, distributing loads evenly during operation. While this ensures reliable power transmission in low-speed settings, it can cause stress concentration at contact points, necessitating precise alignment to prevent premature wear or failure.
Compact Design
The compact conical structure allows integration into space-constrained systems, such as automotive differentials or small machinery. Their design balances strength and size, providing efficient power transfer while maintaining a robust profile suitable for moderate-load industrial environments.

Steel Straight Bevel Gear Features

Straight Bevel Gears vs. Spiral Bevel Gears

Feature	Straight Bevel Gear	Spiral Bevel Gear
Teeth Profile	Teeth are straight and cut along the gear axis on a cone.	Teeth have a spiral curve profile cut on the pitch cone.
Contact Between Teeth	Two teeth come into sudden contact, and the contact is a line equal to the face width of the teeth.	Teeth come into contact gradually, starting with a point and progressing to a line.
Loading	Teeth are subjected to sudden impact or shock loading.	Teeth experience gradual loading, minimizing impact.
Operational Noise	Sudden contact causes significant noise during operation.	Gradual engagement results in quieter operation.
Vibration	Shock loading induces noticeable vibration, making operation less smooth.	Vibration is minimal due to gradual load application, ensuring smoother operation.
Ease of Manufacturing	Easier to design and manufacture, leading to lower costs.	Complex design and manufacturing process make it more expensive.
Thrust Force on Bearings	Exerts less thrust force on bearings compared to spiral bevel gears.	Exerts higher thrust force on bearings due to the spiral tooth profile.
Cost	More affordable due to simpler manufacturing and design.	Higher cost due to complex manufacturing and finishing requirements.
Speed and Power Transmission	Limited speed and power capacity due to vibration and noise constraints.	Capable of handling higher speeds and power loads due to smoother operation.
Applications	Suitable for applications requiring simplicity and lower costs.	Ideal for high-performance applications where smoothness and quiet operation are critical.


Straight Bevel Gears	Spiral Bevel Gears

Steel Straight Bevel Gear Examples and Applications

1. Automotive Industry
Straight bevel gears are integral to the automotive industry, enhancing performance and efficiency. In differential systems, they distribute torque smoothly for stable cornering. In steering systems, they provide precise motion for better control. For transmissions, they enable seamless gear shifts with reduced noise and vibration. Additionally, in electric and hybrid vehicles, they minimize drivetrain noise, ensuring quiet, efficient operation. Their durability and adaptability make them essential in modern automotive designs.

2. Industrial Machinery
Steel bevel gears are essential in industrial machinery, providing smooth, efficient power transmission with reduced noise and vibration. They are widely used in gearboxes for heavy-duty equipment, ensuring reliable torque transfer under high loads. Additionally, straight bevel gears enhance performance in conveyors and material handling systems, ensuring durability and consistent operation in demanding industrial environments. Their adaptability supports various machinery designs.

3. Power Tools
Straight bevel gears are crucial in power tools, offering efficient torque transfer with minimal noise and vibration. In cordless drills and angle grinders, they ensure smooth power delivery for precise and reliable performance. Their durability and ability to handle high torque make them ideal for heavy-duty tools, extending tool life. Additionally, their compact design supports ergonomic and space-efficient tool configurations, enhancing functionality and user comfort in a wide range of applications.

4. Robotics
Bevel gears are vital in robotics, enabling precise motion control and efficient power transmission. They are widely used in robotic arms and joints, ensuring smooth and accurate movements with minimal noise and vibration. Their compact, durable design supports space-constrained robotic systems, making them ideal for advanced automation in manufacturing, healthcare, and logistics, where precision and reliability are critical.

5. Agricultural Machinery
Steel bevel gears play a key role in agricultural machinery by providing reliable, efficient power transmission under heavy loads. In tractors and harvesters, they ensure smooth torque transfer to drive systems, improving performance. For rotary tillers and mowers, they enable precise, durable operation, enhancing cutting and tilling efficiency. Their robust design and noise-reducing capabilities make them ideal for grain conveyors and fertilizer spreaders, ensuring consistent performance in demanding agricultural applications.


Straight Bevel Gear for Automotive Industry	Straight Bevel Gear for Industrial Machinery

Straight Bevel Gear for Robotics	Straight Bevel Gear for Agricultural Machinery