ASTM A194 GR.8 ASTM A194 pecification covers a variety of carbon, alloy, and martensitic and austenitic stainless steel nuts. These nuts are intended for high-pressure or high-temperature service, or both. Bars from which the nuts are made shall be hot-wrought. According to ASTM A194 the material may be further processed by centerless grinding or by cold drawing. Austenitic stainless steel may be solution annealed or annealed and strain-hardened. Each alloy shall conform to the chemical composition requirements prescribed. Hardness tests, proof of load tests, and cone proof load tests shall be made to all nuts to meet the requirements specified. ASTM A194 stated in either inch-pound units or SI units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Within the text, the SI units are shown in brackets. ASTM A194 covers size range ? through 4 in. and metric M6 through M100 nominal. It also covers austenitic stainless steel nuts in the size range ? in. and M6 nominal and above. Unless otherwise specified, the American National Standard Heavy Hex Series (ANSI B 18.2.2) shall be used. Nuts up to and including 1 inch nominal size shall be UNC Series Class2B fit. Nuts over 1 inch nominal size shall be either UNC Series Class 2B fit or 8 UN Series Class 2B fit. High strength ASTM A194 grade 2H nuts are common in the marketplace海盐全丰紧固件有限公司成立于2001年，（原海盐新胜达紧固件厂）坐落于中国较大的紧固件生产基地-浙江省嘉兴市海盐县 本厂坐落于海盐开发区，地理环境优越，交通十分便利。本厂生产设备精良，技术力量雄厚，产品全部选用钢材，进行严格的质量控制，产品合格率均达，畅销全国。 海盐全丰紧固件有限公司是一家致力于高强度紧固件，集生产、销售、研发为一体的公司，本着“诚信经营、倡导规范”的经营理念，充分发挥地域和产业优势，服务全国各地的客户，提供具化的紧固件连接解决方案。 　我们整合制造、开发、和服务的各个环节，注重为客户提供全面配套服务。凭借卓越的创业精神，以及严格管理，量生产，高精度检验，高标准服务！ 我们始终秉承 “以人为本”的管理理念，并坚持将“服务、质高价优、供货快捷”作为自己的追求和对客户的承诺。为了更好的服务客户，提升公司的核心竞争力，我们不断吸收先进的技术和管理理念，力求创新，注重品质，精心打造每一件产品，以充分满足顾客的需求。 　　我厂主要生产的标准有：DIN，ANSI，BS，ISO，JIS，GB，UNI等标准、及非标产品：材质涉及：碳钢，合金钢，不锈钢，铜，尼龙等：产品种类包括各种螺钉，螺栓，螺母，华司，销类等。 生产设备：一摸二冲、多工位冷镦机、CNC车床大型红打设备及冲床。 另外我厂针对工程类行业提供解决方案，热镀锌、达克罗不锈钢螺栓螺帽等大批量定制，交期快，价格低，质量优！ 凭着的紧固件产品和真诚的服务赢得了社会各个领域客户的认可，产品运用在机械、新能源，环保设备、医疗设备、通讯设备、电力设施、电子产品、食品机械、石油化工、船舶装配、泵阀管道、建筑幕墙、露天场合等各种行业，产品受到广大客户一致好评。