THK BL8D Link Ball | THK BL8D Distributor

More about: THK BL8D Link Ball | THK BL8D Distributor

Note: Model BL-A is only available in size 4 and 5.
For more detailed specifications, please download the Product Catalog with the link in the Downloads section of this product page.

Model No.	Outer dimensions			Threaded S1 JIS Class 2	Holder dimensions						Ball shank dimensions						Ball diameter Da	Permissible tilt angles 2θ°	Applied static load Cs	Yield point strength Pk	Mass
	Length L	Diameter D	Height M		L1	l	L2	D1	D2	W 0 -0.3	d2 h9	M1	M2 ±0.3	l1	Hexagon B 0 -0.3	d4
																						mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	degree	N	N	g
	BL4DA	24.5	13		20	M4×0.7	18	8	4	7.5	9.5	8	4	15	7	6	7	8.1	7.938	40	4510	1370	7
BL5DA	34.5	15	26.7	M5×0.8	27	15	4	9	12	10	5	21	10	8	8	9.2	9.525	40	6470	2250	12
BL6D	38	16	32.6	M6×1	30	16	5	10	13	11	6	26	11	11	10	11.6	11.112	40	9900	3920	26
BL8D	45.5	19	38.6	M8×1.25	36	19	6	12.5	16	14	8	31	14	12	12	13.8	12.7	40	12500	6570	49
BL10D	55.5	25	46.3	M10×1.25	43	23	7	14.5	19	17	10	37	17	15	14	16.2	15.875	40	18300	11300	87
BL10BD	55.5	25	52.3	M10×1.5	43	23	7	14.5	19	17	10	43	17	21	14	16.2	15.875	40	18300	11300	90
BL12D	64.5	29	52.7	M12×1.25	50	26	8	17.5	22	19	12	42	19	17	17	19.6	19.05	40	26700	16400	143
BL12BD	64.5	29	59.7	M12×1.75	50	26	8	17.5	22	19	12	49	19	24	17	19.6	19.05	40	26700	16400	148
BL14D	74	34	68.4	M14×1.5	57	30	10	20	25	22	14	56	21.5	22	19	21.9	22.225	40	36400	19800	235
BL14BD	74	34	74.4	M14×2	57	30	10	20	25	22	14	62	21.5	28	19	21.9	22.225	40	36400	19800	245
BL16D	83	38	74	M16×1.5	64	34	11	22	27	24	16	60	23.5	23	22	25.4	22.225	30	36400	26900	315
BL16BD	83	38	80	M16×2	64	34	11	22	27	24	16	66	23.5	29	22	25.4	22.225	30	36400	26900	325

THK BL8D is an M8 × 1.25 Link Ball with a 12.7 mm ball diameter, 40° permissible tilt angle and 12,500 N applied static load. It is designed for compact radial-load linkage applications requiring angular movement between connected components.

Application of THK THK BL8D

THK BL8D is a compact Link Ball designed for mechanical linkage applications where radial load and angular movement are required. As part of the THK BL series, BL8D provides a compact and wear-resistant joint for connecting moving components while allowing smooth angular movement. With an M8 × 1.25 thread and a 12.7 mm ball diameter, BL8D is suitable for a variety of industrial, mechanical and control linkage applications.

1. Machine Tools and Mechanical Linkages

THK BL8D can be used in mechanical linkage mechanisms associated with machine tools and other industrial equipment. In these applications, the Link Ball connects moving components and allows angular movement between connected parts while transmitting mechanical motion.

2. Automation Equipment

BL8D is suitable for linkage mechanisms used in automation equipment and machinery. It can be used where two or more components need to move relative to each other while maintaining a compact and reliable mechanical connection.

3. Mechanical Control Mechanisms

THK BL8D can be used in control and actuation mechanisms where movement needs to be transferred through a mechanical linkage. The spherical joint allows the connected components to accommodate angular movement during operation while maintaining the required mechanical connection.

4. Automotive and Transportation Applications

THK identifies the BL series as suitable for applications such as automobile height sensors and transmission control mechanisms. THK has also conducted durability testing of BL-series Link Balls for transmission control joints used in automobiles, trucks and buses, as well as steering mechanisms for agricultural tractors.

5. Compact Articulated Mechanisms

BL8D is suitable for compact articulated mechanisms where a threaded Link Ball is required to connect moving components. Its spherical joint allows angular movement while maintaining smooth mechanical motion, making it suitable for mechanisms where installation space is limited.

6. Selection Considerations for BL8D

When selecting THK BL8D, the actual load direction, applied load, required angular movement, mounting dimensions and operating environment should be considered. Model BL is designed for radial load application, so the direction of the applied load should be checked carefully during mechanical design.

For applications requiring axial load or a different connection configuration, other THK Link Ball models may be more appropriate depending on the required load direction and installation conditions.