Hexagonal self-drilling screws, manufactured by Hebei Wotu Fastener Manufacturing Co., Ltd., operate under a modern enterprise system and strictly manage according to the ISO9001:2015 quality system. The company uses “Wotu” as its registered trademark.
The term “standard parts” in China is a shorthand for “standard fasteners,” a narrow definition. High- and medium-pressure standard parts refer to a type of fastener that can withstand certain pressure and is used in relatively special environments. The concept of high- and medium-pressure standard parts for blind rivets. The term “standard parts” in China is a shorthand for “standard fasteners,” a narrow definition. High- and medium-pressure standard parts refer to a type of fastener that can withstand certain pressure and is used in relatively special environments.
The concept of high- and medium-pressure standard parts for blind rivets. Standards and Grades for Commonly Used High and Medium Pressure Drill Self-Drilling Screws
1. ASTM A193/A193M-2009 “Alloy Steel and Stainless Steel Bolts for High Temperature Equipment”. This standard has many grades, commonly used ones include: Gr.B6, B7, B7M, B8, B8M, B8-2, B8M-2, B16, etc.
2. ASTM A194/A194M-2009 “Standard Specification for Nuts for High Temperature or High Pressure or High Temperature and High Pressure”. This standard has many grades, commonly used ones include: Gr.2H, 2HM, 4, 6, 7, 7M, 8, 8M, etc.
3. ASTM A320/A320M-2008 “Alloy Steel Bolts for Low Temperature Use”. This standard has many grades, commonly used ones include: Gr.L7, L7M, B8, B8M, B8-2, B8M-2, etc. 4. ASTM A453/A453M-2008 “High-Temperature Bolt Materials with Coefficients of Expansion Similar to Austenitic Steel and Yield Strengths of 50-120 Ksi (345-827 MPa)”. Common grades include Gr.660A and 660B.
5. ASTM A182/A182M-2007 “Forged or Rolled Alloy Steel and Stainless Steel Flanges, Forged Pipe Fittings, Valves, and Components for High-Temperature Applications”. Common fastener grades include F51, F53, and F55.
6. HG/T20634-2009 “Fasteners for Steel Pipe Flanges” (Class Series). This standard replaces the 1997 version, adding significant new content based on ASTM or ASME standards, and removing the clause on double-ended studs.
7. HG/T20613-2009 “Fasteners for Steel Pipe Flanges” (PN Series). This standard replaces the 1997 version and incorporates many new features based on ASTM or ASME standards.
8. ASME Series Standards. ASME standards typically reference ASTM standards, making appropriate modifications or additions to form a series of standards beginning with SA, such as: ASME SA193/SA193M; ASME SA194/SA194M; ASME SA320/SA320, etc.
Hebei Wotu Fastener Manufacturing Co., Ltd., a manufacturer of hexagonal self-drilling screws, sincerely cooperates with friends from all walks of life at home and abroad, working hand in hand to create a brilliant new century.
DIN 931-style half-thread and DIN 933-style full-thread hex bolts should not be selected from diameter and overall length alone. The practical choice depends on the joint stack, required grip, location of the thread transition, available nut engagement, mating hardware, material or property requirement, coating system and governing product specification. A half-thread bolt is not automatically […]
A bolt manufacturer should be evaluated against a defined joint, drawing and acceptance plan—not a product list or unit price alone. Buyers need to verify whether the supplier can manufacture the required geometry, control material and heat-treatment requirements where applicable, manage threads and coatings as one dimensional system, inspect critical characteristics, preserve batch traceability and […]
