Bevel Gear Boxes GN 3971

Product description

Information

Bevel gear boxes GN 3971 can transmit high torque despite their very compact dimensions. They can readily be used for a multitude of applications, such as height adjustments or to change the direction of shaft rotation.

The numerous fastening holes allow for simple mounting in any orientation or position. The parallel keys can take any angular positions.

Specification

Housing

Aluminum
Sealed to prevent dust entry
Anodized finish, natural colorAN

Bevel gear wheels
Steel, case-hardened

Ball bearing

Steel
Sealed (sealing disks 2RS)

Temperature range:
-4 °F to +140 °F (-20 °C to +60 °C)

RoHS

Build & Price

Part Number	b₁	d₁ ±0.0002	b₂	d₂	d₃**	h	l₁	l₂	l₃	l₄	m₁	t₁	t₂

3971-18-L-6-AN	0.71	0.2362 ±0.0002	0.08	0.51	-	0.03	1.26	0.47	0.31	0.08	0.91	0.08	0.61
3971-20-L-8-AN	0.79	0.3150 ±0.0002	0.08	0.63	0.36	0.03	1.38	0.47	0.31	0.08	0.98	0.08	0.60
3971-24-L-10-AN	0.94	0.3937 ±0.0002	0.16	0.75	0.46	0.06	1.65	0.63	0.47	0.12	1.18	0.08	0.71
3971-26-L-12-AN	1.02	0.4724 ±0.0002	0.16	0.83	0.54	0.06	1.81	0.63	0.47	0.12	1.30	0.08	0.77
3971-30-L-12-AN	1.18	0.4724 ±0.0002	0.16	0.94	0.65	0.06	2.09	0.63	0.47	0.12	1.50	0.08	0.72
3971-32-L-12-AN	1.26	0.4724 ±0.0002	0.16	1.10	0.78	0.06	2.20	0.63	0.47	0.12	1.57	0.08	0.72
3971-35-L-12-AN	1.38	0.4724 ±0.0002	0.16	1.18	0.80	0.06	2.36	0.63	0.47	0.12	1.67	0.08	0.72

b₁	d₄	d₅***	d₆***	d₇****	m₂	m₃	m₄	m₅

0.71	0.12	M 3	M 3	M 3	0.24	0.33	0.51	0.43
0.79	0.12	M 3	M 3	M 3	0.28	0.39	0.59	0.39
0.94	0.16	M 4	M 4	M 4	0.31	0.47	0.71	0.63
1.02	0.16	M 4	M 4	M 5	0.35	0.51	0.79	0.63
1.18	0.16	M 4	M 4	M 5	0.43	0.59	0.87	0.63
1.26	0.16	M 4	M 4	M 5	0.47	0.67	0.94	0.63
1.38	0.16	M 4	M 4	M 5	0.53	0.69	1.02	0.63

b₁	d₁ ±0.0002	b₂	d₂	d₃**	h	l₁	l₂	l₃	l₄	m₁	t₁	t₂

0.71	0.2362	0.08	0.51	-	0.03	1.26	0.47	0.31	0.08	0.91	0.08	0.61
0.79	0.3150	0.08	0.63	0.36	0.03	1.38	0.47	0.31	0.08	0.98	0.08	0.60
0.94	0.3937	0.16*	0.75	0.46	0.06	1.65	0.63	0.47	0.12	1.18	0.08	0.71
1.02	0.4724	0.16	0.83	0.54	0.06	1.81	0.63	0.47	0.12	1.30	0.08	0.77
1.18	0.4724	0.16	0.94	0.65	0.06	2.09	0.63	0.47	0.12	1.50	0.08	0.72
1.26	0.4724	0.16	1.10	0.78	0.06	2.20	0.63	0.47	0.12	1.57	0.08	0.72
1.38	0.4724	0.16	1.18	0.80	0.06	2.36	0.63	0.47	0.12	1.67	0.08	0.72

b₁	d₄	d₅***	d₆***	d₇****	m₂	m₃	m₄	m₅

0.71	0.12	M 3	M 3	M 3	0.24	0.33	0.51	0.43
0.79	0.12	M 3	M 3	M 3	0.28	0.39	0.59	0.39
0.94	0.16	M 4	M 4	M 4	0.31	0.47	0.71	0.63
1.02	0.16	M 4	M 4	M 5	0.35	0.51	0.79	0.63
1.18	0.16	M 4	M 4	M 5	0.43	0.59	0.87	0.63
1.26	0.16	M 4	M 4	M 5	0.47	0.67	0.94	0.63
1.38	0.16	M 4	M 4	M 5	0.53	0.69	1.02	0.63

3D Product Configurator

Mechanical Features

Gear ratio i

1:1

Circumferential backlash at the drive shaft

3° ± 0.5°

Shaft direction of rotation

Any

Life expectancy (guide value)

1,000 hours under full load and rotational speed of 500 rpm,
assuming the gear box is operating for 20% of every 5 minutes
(1 minute of operation + 4 minutes break) at an ambient temperature of 68 °F (20 °C)

Maintenance

Permanent lubrication with grease, maintenance-free

Show / Hide columns

b₁	Max. torque in Nm at 100 rpm	at 500 rpm	at 1000 rpm	Max. radial force*	Max. axial force **

18	0.35	0.1	0.05	13.49 lbf (60 N)	13.49 lbf (60 N)
20	0.75	0.3	0.15	22.48 lbf (100 N)	22.48 lbf (100 N)
24	2.5	1	0.5	26.98 lbf (120 N)	26.98 lbf (120 N)
26	4	1.5	0.75	31.47 lbf (140 N)	31.47 lbf (140 N)
30	5	2	1	53.95 lbf (240 N)	53.95 lbf (240 N)
32	8	3	1.5	124 lbf (550 N)	124 lbf (550 N)
35	10	4	2	124 lbf (550 N)	124 lbf (550 N)

*at axial force = 0, **at radial force = 0

Assembly Instructions

Do not exert any forces onto the housing or into the bearings during assembly. Use of the threaded holes d₆ in the shaft is recommended.

The use of a corresponding coupling is recommended to compensate for manufacturing-related shaft offsets and runout tolerances as well as for damping vibrations and shocks.

Application Example

Selected Part

Part Number

Total US Dollars (net)

$270.80

In Stock: 2

In Stock

Quantity

Please note our quantity discounts (US Dollars).

Min	Max	Price
1	9	$270.80
10	24	$248.23
25	49	$225.67
≥ 50		$203.10

Prop 65: Not compliant

WARNING:
Cancer and Reproductive Harm - www.P65Warnings.ca.gov

RoHS: Compliant

This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).

Weight: 0.121 lbs

If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351

All Prices are in US Dollars. Taxes Not Included.