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YDTech® Short Cylindrical Rollers 2 x 1.5mm (L/D 0.75) – G0 Grade In Stock

Name: Ultra-Short Cylindrical Rollers 2x1.5mm (L/D 0.75) – G0 Grade, 0.5µ Grouping
Brand: YDTech®
SKU: NR-2026-0721
Price: 9.80 USD
Availability: InStock
Rating: 4.8 (12 reviews)

we have over 20 years of manufacturing experience of precision rolelrs. we had most stock, delivery time: send to europe, USA, or canada only 3-5 work days .

As a specialized manufacturer of miniature high-precision rolling elements, we have dedicated our metallurgical expertise and sub-micron grinding capabilities to the production of ultra-short cylindrical rollers—specifically the critical 2mm (D) x 1.5mm (L) geometry with an optimized L/D ratio of 0.75. While standard bearing suppliers treat rollers as commodities, we approach them as precision metrological instruments. Our manufacturing philosophy is simple: when the industry demands zero margin for error, we deliver rolling elements that redefine the limits of geometric accuracy and batch consistency.

Precision Metrology: 1µm Cylindricity & 0.5µ Diameter Grouping

Our proprietary manufacturing and inspection protocols are benchmarked against a strict in-house G0-grade standard, which surpasses conventional bearing industry specifications. For every batch of 2x1.5mm ultra-short rollers, we guarantee a diameter grouping interval of 0.0005mm (0.5 microns). This extreme level of batch homogeneity ensures that when multiple rollers are assembled into a single bearing or linear guide, each rolling element carries an absolutely equal share of the preload—eliminating torque ripple and micro-vibration in high-precision rotary and linear motion systems.

Material Options: Si3N4 Ceramic, 52100, and 440C Stainless Steel

52100 (GCr15) Bearing Steel: It is the undisputed choice for ultra-high-pressure fuel pump tappets and heavy-load industrial robot joints where contact stress exceeds 4.5 GPa.

440C Stainless Steel: This grade is mandatory for cleanroom medical actuators and semiconductor handling equipment.

Si₃N₄ (Silicon Nitride) Ceramic: As a leading differentiator, we manufacture ceramic rollers that are non-magnetic, electrically insulating, and 40% lighter than steel.

technical parameters of cylindrical rollers


diameter tolerance	+0/-0.005, +0/-0.003, +0/-0.002, grouping for 0.001mm or 0.0005mm
length tolerance	+/-0.015, +/-0.01, +0/-0.015, +/-0.005,+0/-0.005
radius	R0.03-R0.3
parallelism	0.01, 0.005
perpendicularity	0.01, 0.005
circularity	0.001
cylindricity	0.001
roughness	Ra0.1

Our ultra-short L/D 0.75 rollers are engineered specifically to solve the most demanding motion control challenges. Their short geometry prevents torsional skewing under alternating loads, making them the preferred rolling elements for:

sizes of cylindrical rollers elements

sizes	D_w	L_w	r_s_min	r_s_max	sizes	D_w	L_w	r_s_min	r_s_max
3x3	3	3	0.2	0.4	3x5	3	5	0.2	0.4
3.5x5	3.5	5	0.2	0.4	4x4	4	4	0.2	0.4
4x6	4	6	0.2	0.4	4x8	4	8	0.2	0.4
4.5x4.5	4.5	4.5	0.2	0.6	4.5x6	4.5	6	0.2	0.6
5x5	5	5	0.2	0.6	5x8	5	8	0.2	0.6
5x10	5	10	0.2	0.6	5.5x5.5	5.5	5.5	0.2	0.6
5.5x8	5.5	8	0.2	0.6	6x6	6	6	0.2	0.6
6x8	6	8	0.2	0.6	6x10	6	10	0.2	0.6
6x12	6	12	0.2	0.6	6.5x6.5	6.5	6.5	0.2	0.6
6.5x9	6.5	9	0.2	0.6	7x7	7	7	0.2	0.6
7x10	7	10	0.2	0.6	7x14	7	14	0.2	0.6
7.5x7.5	7.5	7.5	0.2	0.6	7.5x9	7.5	9	0.2	0.6
7.5x11	7.5	11	0.2	0.6	8x8	8	8	0.2	0.6
8x10	8	10	0.2	0.6	8x12	8	12	0.2	0.6
9x9	9	9	0.3	0.7	9x10	9	10	0.3	0.7
9x14	9	14	0.3	0.7	10x10	10	10	0.3	0.7
10x11	10	11	0.3	0.7	10x14	10	14	0.3	0.7
11x11	11	11	0.3	0.7	11x12	11	12	0.3	0.7
11x15	11	15	0.3	0.7	12x12	12	12	0.3	0.7
12x14	12	14	0.3	0.7	12x18	12	18	0.3	0.7
13x13	13	13	0.4	0.8	13x20	13	20	0.4	0.8
14x14	14	14	0.4	0.8	14x20	14	20	0.4	0.8
15x15	15	15	0.4	0.8	15x16	15	16	0.4	0.8
15x22	15	22	0.4	0.8	16x16	16	16	0.4	0.8
16x17	16	17	0.4	0.8	16x24	16	24	0.4	0.8
17x17	17	17	0.4	1.0	17x24	17	24	0.4	1.0
18x18	18	18	0.4	1.0	18x19	18	19	0.4	1.0
18x26	18	26	0.4	1.0	19x19	19	19	0.4	1.0
19x20	19	20	0.4	1.0	19x28	19	28	0.4	1.0
20x20	20	20	0.4	1.0	20x30	20	30	0.4	1.0
21x21	21	21	0.5	1.1	21x30	21	30	0.5	1.1
22x22	22	22	0.5	1.1	22x24	22	24	0.5	1.1
22x34	22	34	0.5	1.1	23x23	23	23	0.5	1.1
24x24	24	24	0.5	1.1	24x26	24	26	0.5	1.1
24x36	24	36	0.5	1.1	25x25	25	25	0.5	1.1
25x36	25	36	0.5	1.1	26x26	22	26	0.5	1.1
26x28	22	28	0.5	1.1	26x40	22	10	0.5	1.1
28x28	28	28	0.6	1.4	28x44	28	44	0.6	1.4
30x30	30	30	0.6	1.4	30x48	30	48	0.6	1.4
32x32	32	32	0.6	1.4	32x52	32	52	0.6	1.4
34x34	34	34	0.6	1.4	34x55	34	55	0.6	1.4
36x36	36	36	0.7	1.7	36x58	36	58	0.7	1.7
38x38	38	38	0.7	1.7	38x62	38	62	0.7	1.7
40x40	40	40	0.7	1.7	40x65	40	65	0.7	1.7
42x42	42	42	0.9	2.1	45x45	45	45	0.9	2.1

Semiconductor Lithography (DUV/EUV Wafer Stages): Our rollers (available in Si₃N₄ for vacuum compatibility) serve as high-stiffness spacing elements and air-bearing guidance components. The 0.5µ grouping ensures that wafer stages maintain Z-axis drift within ±0.5µm during high-speed step-and-scan movements, directly impacting overlay accuracy at 3nm/5nm nodes.

diameter and roundness of cylindrical rollers

grade	D_w/mm		V_{D_w}L	I_G	regulation values			��C_ir
grade	exceed	to	max	I_G	regulation values			max
G0	-	18	1	1	-10,...,-1	0	+1,...,+5	0.3
G0	18	30	1	1	-10,...,-1	0	+1,...,+5	0.4
G1	-	18	2	1	-10,...,-1	0	+1,...,+5	0.30.4
G1	18	30	2	1.5	-10.5,...,-1.5	0	+1.5,...,+6	0.5
G2	-	18	3	1	-10,...,-1	0	+1,...,+5	0.5
G2	18	30	3	1.5	-19.5,...,-1.5	0	+1.5,...,+6	1.0
G2	30	-	3	2	-20,...,-2	0	+2,...,+6	1.5
G3	-	18	1	1	-10,...,-1	0	+1,...,+5	1.0
G3	18	30	1	2	-20,...,-2	0	+2,...,+6	1.5
G3	30	-	5	3	-24,...,-3	0	+3,...,+6	2.5

Crossed Roller Bearings for Precision Rotary Tables and Collaborative Robots: The L/D 0.75 ratio is the "golden proportion" for V-groove crossed arrangements. Our rollers eliminate the "edge-loading" effect commonly found in longer rollers, guaranteeing smooth, zero-clearance rotation with torque fluctuation under ±2%—critical for DD motor direct-drive tables and force-controlled cobot joints.

V-block measurement for roundness of cylindrical rollers


angle	wave numbers
angle	3	5	7	9	11	13	15	17	19	21
60°C	3	-	-	3	-	-	3	-	-	3
90°C	2	2	-	-	2	2	-	-	2	2
120°C	1	2	2	1	-	-	1	2	2

Aerospace Fuel Metering Units and High-Pressure Pumps: Under extreme pressures (up to 500 Bar) and high-temperature jet fuel, our 52100 and 440C rollers provide exceptional durability against micropitting and white etching area (WEA) formation, ensuring the safety and reliability of critical flight-control and propulsion systems.