BS ISO 12261 标准规定了航空航天用螺钉的尺寸和技术要求。这些螺钉采用内六角、长螺纹、金属材料、涂层或未涂层，强度等级小于或等于1 100 MPa。该标准适用于内六角、带有偏移十字肋或无肋驱动的平头螺钉，其螺纹直径为MJ，长度为长螺纹。

BS ISO 12261 标准中规定了螺钉的尺寸和公差，包括螺纹直径、螺纹长度、头部直径、头部高度、内六角尺寸等。此外，该标准还规定了螺钉的材料、表面处理、强度等级和机械性能要求。螺钉的材料可以是钛合金、不锈钢、镍基合金等，表面处理可以是电镀、喷涂、阳极氧化等。

BS ISO 12261 标准中规定的螺钉适用于航空航天领域的各种应用，如飞机、卫星、导弹等。这些螺钉具有高强度、高精度、高可靠性等特点，能够满足航空航天领域对螺钉的严格要求。

相关标准
- BS EN 4163: Aerospace series. Screws, pan head, offset cruciform ribbed or unribbed drive, close tolerance shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa. Dimensions
- BS EN 4164: Aerospace series. Screws, pan head, offset cruciform ribbed or unribbed drive, close tolerance shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa. Dimensions
- BS EN 4165: Aerospace series. Screws, pan head, offset cruciform ribbed or unribbed drive, close tolerance shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa. Dimensions
- BS EN 4166: Aerospace series. Screws, pan head, offset cruciform ribbed or unribbed drive, close tolerance shank, long length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa. Dimensions
- BS EN 4167: Aerospace series. Screws, pan head, offset cruciform ribbed or unribbed drive, close tolerance shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa. Dimensions