JR-2晶形完整，是兼顾切割效率和工具寿命的最佳选择。相比JR-1拥有更规则的晶形，强度更高，适用于高负荷切磨对工具寿命有更高要求的场合。
JR系列可供粒度表 —— JR Series Mesh Size Availabilit
US Mesh（FEPA) | 40/50 (D427) | 50/60 (D301) | 60/80 (D252) | 80/100 (D181) | 100/120 (D151) | 120/140 (D126) | 140/170 (D107) | 170/200 (D91) | 200/230 (D76) | 230/270 (D64) | 270/325 (D54) | 325/400 (D46) |
| BRD-1 | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
磨料粒度及尺寸对照表
ABRASIVE MATERIALS MESH SIZE COMPARISON LIST
贝斯科 BESCO | 国际标准 | 欧洲共同体 | 美国 U.S.A | 日本 JAPAN | 理论基准尺寸 | 俄罗斯 RUSSIA |
GB/T6406-1995 | ISO | FEPA | ANIS B74.16-1971 | JIS4130-1988 |
Theoretlcal Baslc Size | 9206-80 |
| 粒度 | 尺寸 | 粒度 1 | 粒度 2 | 尺寸 | 粒度 | 尺寸 | 粒度 | 尺寸 | 粒度 | 尺寸 | 英寸 | 毫米 | 粒度 | 尺寸 |
| 40/50 | 425/300 | 427 | 40/50 | 425/300 | B/427 | 355/300 | 40/50 | 425/300 | 40/50 | 425/300 | 0.015 | 0.378 | 500/400 | 500/400 |
| 50/60 | 300/250 | 301 | 50/60 | 300/250 | B/301 | 300/250 | 50/60 | 300/250 | 50/60 | 300/250 | 0.011 | 0.288 | 400/315 | 400/315 |
| 60/80 | 250/180 | 252 | 60/80 | 250/180 | B/252 | 250/180 | 60/80 | 250/180 | 60/80 | 250/180 | 0.009 | 0.226 | 250/200 | 250/200 |
| 80/100 | 180/150 | 181 | 80/100 | 180/150 | B/181 | 180/150 | 80/100 | 180/150 | 80/100 | 180/150 | 0.0069 | 0.174 | 200/160 | 200/160 |
| 100/120 | 150/125 | 151 | 100/120 | 150/125 | B/151 | 150/125 | 100/120 | 150/125 | 100/120 | 150/125 | 0.0058 | 0.148 | 160/125 | 160/125 |
| 120/140 | 125/106 | 126 | 120/140 | 125/106 | B/126 | 125/106 | 120/140 | 125/106 | 120/140 | 125/106 | 0.0048 | 0.123 | 125/100 | 125/100 |
| 140/170 | 106/90 | 107 | 140/170 | 106/90 | B/107 | 106/90 | 140/170 | 106/90 | 140/170 | 106/90 | 0.0041 | 0.103 | 100/80 | 100/80 |
| 170/200 | 90/75 | 91 | 170/200 | 90/75 | B/91 | 90/75 | 170/200 | 90/75 | 170/200 | 90/75 | 0.0034 | 0.086 | 80/63 | 80/63 |
| 200/230 | 75/63 | 76 | 200/230 | 75/63 | B/76 | 75/63 | 200/230 | 75/63 | 200/230 | 75/63 | 0.003 | 0.075 | 63/50 | 63/50 |
| 230/270 | 63/53 | 64 | 230/270 | 63/53 | B/64 | 63/53 | 230/270 | 63/53 | 230/270 | 63/53 | 0.0026 | 0.066 | 50/40 | 50/40 |
| 270/325 | 53/45 | 54 | 270/325 | 53/45 | B/54 | 53/45 | 270/325 | 53/45 | 270/325 | 53/45 | 0.0022 | 0.057 |
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| 325/400 | 45/38 | 46 | 325/400 | 45/38 | B/46 | 45/38 | 325/400 | 45/38 | 325/400 | 45/38 | 0.0019 | 0.048 |
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