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Database: 365,228(8 Aug 2026)
  1. HOME
  2. Standards for Aperture unit

Aperture unit

Aperture unit, Total:211 items.

The international standard classification for "Aperture unit" includes: Photographic equipment. Projectors , Analytical chemistry in general , Ceramic products , Geotextiles , Laboratory ware and related apparatus , Turning tools , Drills, countersinks, reamers , Drilling machines , Fiber and cables , Refractories , Screw threads in general .

The Chinese standard classification for "Aperture unit" includes: Lens , Measuring devices , Combination grippers , Separating machinery , Special ceramics , Other textile articles , Daily use glass products , Cutting tools , Optical communication equipment , Fireproof material in general , Length Measurement .

Group Standards of the People's Republic of China

Taiwan Provincial Standard of the People's Republic of China

  • CNS 7475-1981 Methods of Measurement for Effective Aperture, F - number, Aperture Ratio and T-number of Photographlc Lenses
  • CNS 211-1953 Diameters of Drill Heads (for Drilling Bolt Holes)
  • CNS 4245-1978 Clearance Holes for Metric Bolts (1.6 up to and Including 150 mm Thread Diameter)
  • CNS 3594-1988 Bore Diameter of Milling Cutters
  • CNS 7220-1983 Information Processing-Punched Paper Tape-Dimensions and Location of Feed Holes and Code Holes
  • CNS 5674-1980 Cutter Bore
  • CNS 5500-1985 Badial Self-aligning Ball Bearings, Parallel and Tapered Bore

Professional Standard - Machinery

Professional Standard - Aviation

  • HB 1744-1987 Screw Hole Rhombic Positioning Pin
  • HB 4207-1989 Vernier caliper for inner hole clearance groove diameter
  • HB 1471-1987 Middle Hole Position Plate
  • HB 1737-1987 Through-hole Cylindrical Positioning Pin
  • HB 6802-1993 Blind Hole Inside Diameter Measuring Head with Positioning Step for 10000 Times Pneumatic Micrometer Use (D≥8~14)
  • HB 3955-1987 Side-hole Position Plate
  • HB 1733-1987 Small Through-hole Cylindrical Positioning Pin
  • HB 1410-1987 Side-hole Position Plate
  • HB 2075-1974 Vernier caliper for bore diameter
  • HB 4535.31-1991 K type hole series combined clamp elements Adjustable hole position bearing
  • HB 6803-1993 Blind Hole Inside Diameter Measuring Head with Positioning Step for 10000 Times Pneumatic Micrometer Use (D>14~30)
  • HB 6797-1993 Blind Hole Inside Diameter Measuring Head with Positioning Step for 5000 Times Pneumatic Micrometer Use (D>14~30)
  • HB 1563-1987 Large Middle Hole Position Plate
  • HB 1734-1987 Small Screw Hole Cylindrical Positioning Pin
  • HB 2075-1989 Vernier caliper for inner hole clearance groove diameter
  • HB 2074-1974 Vernier caliper for bore diameter
  • HB 1739-1987 Countersink Cylindrical Positioning Pin
  • HB 1743-1987 Through-hole Rhombic Positioning Pin
  • HB 6796-1993 Blind Hole Inside Diameter Measuring Head with Positioning Step for 5000 Times Pneumatic Micrometer Use (D≥8~14)

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

  • GB/T 14300-2007 Straight flute drill with indexable inserts
  • GB/T 11415-1989 Laboratory sintered(fritted) filters-Porosity grading, classification and designation
  • GB/T 38949-2020 Determination of pore size for porous membranes—Standard particle method
  • GB/T 14300-1993 Straight flute drill with indexable inserts
  • GB/T 14799-1993 Geotextiles－Determining apparent opening size of a geotextile by sieving
  • GB 11415-1989 Laboratory Sintered (Porous) Filter Pore Size, Classification and Designation
  • GB/T 14297-1993 Boring bars for indexable inserts
  • GB/T 20330-2006 Drill diameter for use prior to tapping screw threads
  • GB/T 1967-1996 Test method for pore diameter of porous ceramic
  • GB/T 45528-2025 Nanotechnology—Measurement of pore size and pore size distribution of nanoporous materials—Fluorescence probe method

Professional Standard-Ships

Professional Standard - Post and Telecommunication

  • YD/T 816-1996 Multimode optical fibre with large core diameter and large numerical aperture
  • YD/T 816-2003 Multimode optical fibre with large core diameter and large numerical aperture

Military Standard of the People's Republic of China-Commission of Science,Technology and Industry for National Defence

  • GJB 5089-2002 Calculation method for the resolution and the target's pixel position of satellite-borne synthetic aperture radar

Professional Standard - Electron

  • SJ 2691-1986 Rotary wafer switches (low current rating) with cental mounting and two-hole positioning,maximum number of position,maximum diameter 42mm,Type KX13

Professional Standard - Ferrous Metallurgy

  • YB/T 118-2020 Refractory products-Determination of pore size distribution
  • YB/T 118-1997 Test method for pore size distribution of refractory

Professional Standard - Railway

Heilongjiang Provincial Standard of the People's Republic of China

  • DB23/T 1524-2013 Technical regulations for small aperture measuring instruments with large depth-to-diameter ratio

Professional Standard - Ocean

Professional Standard - Chemical Industry

Professional Standard - Aerospace

  • QJ 2920-1997 Forward Underport Diameter of MJ Internal Thread Tapping
  • QJ/Z 19-1984 Screw Hole Blank Inner Diameter Smooth Plug Gauge

National Metrological Technical Specifications of the People's Republic of China

  • JJF(机械) 027-2008 Calibration Specifications for Relative Aperture Testers
  • JJF 1806-2020 Calibration Specification for Measuring Equipmentof Diameter of Micro and Small Hole

National Metrological Verification Regulations of the People's Republic of China

Association Francaise de Normalisation

  • NF G32-303:1981 Clothing - Clothing accessories - Shank buttons - Hole diameter and position
  • NF E81-061:1991 Punching and stamping. Aperture and pitch of perforated materiel with round holes and square holes.
  • NF L23-202/A1:1979 RETAINING RING FOR BORES.
  • NF L81-450:1954 Section of trimming for aperture edges (rech.).
  • NF G32-302:1981 Clothing - Clothing accessories - 2 or 4 hole buttons - Hole diameters and spacings

German Institute for Standardization

  • DIN 66139:2012-03 Pore size analysis - Representation of pore size distributions / Note: To be replaced by DIN 66139 (2022-12).
  • DIN 66139:2022-12 Pore size analysis - Representation of pore size distributions / Note: Date of issue 2022-11-18*Intended as replacement for DIN 66139 (2012-03).
  • DIN 66139:2012 Pore size analysis - Representation of pore size distributions
  • DIN 66139 E:2010-02 Pore size analysis - Representation of pore size distributions
  • DIN 66139 E:2022-12 Draft Document - Pore size analysis - Representation of pore size distributions
  • DIN 66139 E:2010 Draft Document - Pore size analysis - Representation of pore size distributions
  • DIN 3357-3:1981 Reduced bore steel ball valves
  • DIN 69104:1981 Grinding wheel outer diameter thickness hole
  • DIN 331:1924 Drill bits with a diameter of 2 mm
  • DIN 7952-2:1971-10 Sheet Metal Rim Holes with Screw Thread; Prepunch Hole Diameters
  • DIN 5256:1997 Pliers for retaining rings for bores
  • DIN 3357-5:1981 Reduced bore nonferrous metal ball valves
  • DIN 2245-1:2008-07 Geometrical product specifications (GPS) - Limit plug gauges - Part 1: For holes from 1 mm up to 40 mm nominal diameter
  • DIN 20311:2002 Drill tubes with diameters exceeding 100 mm for large hole boring in mining
  • DIN 7952-2:1971 Sheet Metal Rim Holes with Screw Thread; Prepunch Hole Diameters
  • DIN 20311:2002-11 Drill tubes with diameters exceeding 100 mm for large hole boring in mining
  • DIN 108-7:1988 Slide projectors and slides; overhead projectors; aperture area, location pins, projection screens, evaluation
  • DIN 49580:1985 Electrical communication engineering; jack strip 10 point with four-way jack

Japanese Industrial Standards Committee (JISC)

Institute of Interconnecting and Packaging Electronic Circuits (IPC)

United States Navy

American Society for Testing and Materials (ASTM)

  • ASTM UOP964-98 Surface Area, Pore Volume, Average Pore Diameter and Pore Diameter Distribution of Porous Materials
  • ASTM UOP964-11 Surface Area, Pore Volume, Average Pore Diameter, and Pore Size Distribution of Porous Materials by Nitrogen Adsorption
  • ASTM UOP578-11 Automated Pore Volume and Pore Size Distribution of Porous Substances by Mercury Porosimetry
  • ASTM UOP578-02 Automated Pore Volume and Pore Size Distribution of Porous Substances by Mercury Porosimetry
  • ASTM UOP578-84 Automated Pore Size Distribution of Porous Substances by Mercury Porosimetry
  • ASTM UOP425-86 Surface Area, Pore Volume and Pore Diameter of Porous Substances by Nitrogen Adsorption

Swedish Institute for Standards

Korean Agency for Technology and Standards (KATS)

  • KS B ISO 273:2010 Diameter of clearance holes and counterbores for bolts and screws
  • KS B 2305-2006 Nominal size and bore of valves
  • KS B 1006-1975 Hole Sizes Before Threading
  • KS B 5409-1982 Photographic lenses — Methods for the measurement of the effective aperture, F-number and relative aperture
  • KS B 5409-2013 Photographic lenses — Methods for the measurement of the effective aperture, F-number and relative aperture
  • KS B 5409-1998 Photographic lenses-Methods for the measurement of the effective aperture, F-number and relative aperture
  • KS B 5409-2023 Methods for the measurement of the effective aperture, F-number and relative aperture of photographic lenses
  • KS B 5409-2013(2018) Photographic lenses — Methods for the measurement of the effective aperture, F-number and relative aperture
  • KS X ISO 10549-2007(2022) Micrographics－A6 size aperture cards
  • KS B ISO 273-2020 Diameter of clearance holes and counterbores for bolts and screws
  • KS B 2305-2021 Nominal size and bore of valves
  • KS B ISO 273-2010(2020) Diameter of clearance holes and counterbores for bolts and screws
  • KS K 0754-2007 Test method for apparent opening size of geotextile-Dry method
  • KS K 0754-2015 Standard test method for determining apparent opening size of a geotextile
  • KS B 2305-2006(2021) Nominal size and bore of valves
  • KS B ISO 2541-2018(2023) Centre drills for centre holes with radius form — Type R
  • KS X 5302-2021 Information processing－Punched paper tape－Dimensions and location of feed holes and code holes

Spanish Association for Standardization (UNE)

Universal Oil Products Company (UOP)

  • UOP 964-2011 Surface Area, Pore Volume, Average Pore Diameter, and Pore Size Distribution of Porous Materials by Nitrogen Adsorption
  • UOP 821-1981 Automated Micro Pore Size Distribution of Porous Substances by Nitrogen Adsorption and/or Desorption Using a Micromeritics Analyzer
  • UOP 578-2011 Automated Pore Volume and Pore Size Distribution of Porous Substances by Mercury Porosimetry
  • UOP 425-1986 Surface Area, Pore Volume and Porosity Diameter of Porous Substances by Nitrogen Adsorption

U.S. Air Force

Gosstandart of Russia

  • GOST 21586-1976 Countersinks for machining holes diameters from 3 to 80 mm. Hole tolerance
  • GOST 14802-1985 Rivets (high precision). Hole diameters for rivets, urset head dimensions and length selection
  • GOST 19257-1973 Holes for threading metric thread. Diameters
  • GOST 21348-1975 Holes for threading pipe cylindrical thread. Diameters
  • GOST 21350-1975 Holes for threading pipe taper screw thread. Diameters

Bureau of Indian Standards

  • IS 7745-1975 Dimensions of lubrication holes, grooves and bores
  • IS 18061-2023 Selection Of Aperture Size Percentage Open Area And Wire Diameter Combination For Industrial Screens - Guidelines
  • IS 8526-1977 Cylinder Bore and Cylinder Port Dimensions

Standards Norway

Polski Komitet Normalizacyjny (PKN)

(U.S.) Telecommunications Industries Association

European Committee for Standardization (CEN)

Czech Standards Institute (UNMZ)

The Institution of Engineering and Technology (IET)

American National Standards Institute （ANSI)

GCC Standardization Organization

  • GSO ISO/TS 19130-2:2015 Geographic information -- Imagery sensor models for geopositioning -- Part 2: SAR, InSAR, lidar and sonar
  • GSO ISO 2541:2013 Centre drills for centre holes with radius form -- Type R
  • GSO ISO 13542:2015 Paper and board -- Specification for internal diameters of cores for reels

Ente Nazionale Italiano di Unificazione

  • UNI 3220-1974 Center positioning hole
  • UNI 10481:1995 Filter paper. Determination of equivalent diameter of maximum, minimum and mean flow pore.
  • UNI 8108:2013 Thread forming screws - Hole diameters (for thread forming screws)
  • UNI EN ISO 10323:1996 Tental rotary instruments. Bore diameters for discs and wheels.

North Atlantic Treaty Organization Standards Agency

Society of Automotive Engineers (SAE)

Indonesia Standards

  • SNI ISO/TS 19130-2:2016 Geospatial information Image sensor models for geolocation Part 2: Synthetic Aperture Radar (SAR), Interferometric Synthetic Aperture Radar (InSAR), Light Detection and Ranging (lidar), and Sonar
  • SNI 08-4418-1997 Test method for pore size of geotextile

Internet Engineering Task Force (IETF)

Danish Standards Foundation

  • DS 2389:1993 Centre holes 60 degree. Determination of dimensions
  • DS 2390:1993 Centre holes 90 degree. Determination fo dimensions

COMMISSION FOR THE STANDARDS, METROLOGY AND QUALITY OF VIETNAM (STAMEQ)

National Standardisation Body (ASRO)

British Standards Institution (BSI)

  • BS EN 2309:1990 Specification for hole sizes for solid rivets
  • BS 5731-1:1979 Specification for apertures and mountings for controls for external equipments in protective cabs on agricultural tractors-Apertures
  • BS 7591-4:1993(1997) Porosity and pore size distribution of materials - Part 4: Method of evaluation by liquid expulsion
  • BS ISO 13319-1:2021 Determination of particle size distribution. Electrical sensing zone method. Aperture/orifice tube method

American Society of Mechanical Engineers (ASME)

  • ASME MFC-14M-1995 Measurement of fluid flow using small bore precision orifice meters
  • ASME MFC-14M-2003 Measurement of Fluid Flow Using Small Bore Precision Orifice Meters

International Organization for Standardization (ISO)

  • ISO 3017:1981 Abrasive discs; Designation, dimensions and tolerances; Selection of disc outside diameter/centre hole diameter combinations
  • ISO 3017:1973 Title missing - Legacy paper document
  • ISO/R 106:1959 Withdrawal of ISO/R 106-1959

Magyar Szabványügyi Testület

GM North America

European Association of Aerospace Industries

Association for Electrical, Electronic & Information Technologies (VDE)

Cuban Institute of Standards and Metrology

  • NC 99-51-1988 Compating. Perforated Tapes. Perforation Forms, Dimensions and Location

Swiss Association for Standardization (SNV)

  • SN EN 54 Teil 9-1984 Components of automatic fire detection SystemsPart 9: Fire sensitivity festOrganes constitutifs des systemes de detection automatique d'incendiePartie 9: Essais de sensibilite sur foyers types

Finnish Standards Institute

Society of Motion Picture and Television Engineers (SMPTE)

  • SMPTE ST 198-2003 Motion-Picture Film (8-mm Type S) - 50-ft Model 1 Sound Camera Cartridge - Aperture, Pressure Pad and Film Position

Netherlands Institute for Standardization

  • NEN 2835-1971 Gauges - Plug gauges for holes, diameters 1 up to and including 40 mm

Türk Standardları Enstitüsü

  • TS 511-1967 Light Metal Rivets for Shipbuilding Nominal Diameters, Rivet Hole Diameters and Clearances

Aerospace Industries Association/ANSI Aerospace Standards

  • NAS 618-2010(R2014) FASTENER, RECOMMENDED SHANK, HOLE, AND HEAD-TO-SHANK FILLET RADIUS LIMITS FOR NAS618

Aperture unit

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