Author
Johnson Liu
Digital Communications, Canton Hyland
MA Digital Media, Johns Hopkins University
Writes the door hardware guides and factory news published on this site.
Guides (47)
- India HSN Codes for Door Hardware 2026: Every Eight-Digit Tariff Item Under 8301 and 8302, and How Locks, Hinges and Closers Are Classified
- Exit Device Locking Method 2026: Rim, Surface Vertical Rod, Concealed Vertical Rod or Mortise, and Where Each One Fits
- Fire Door Annual Inspection 2026: The Hardware Items That Fail, from Closers and Latches to Labels, Under NFPA 80 and the EN Standards
- Importing Door Hardware from China into Mexico 2026: Padrón de Importadores, Customs Broker, Pedimento, Tariff Classification and NOM Labeling
- Copper Hinges or Brass Hinges? What a Copper Hinge Is When You Order Door Hinges
- Cylindrical and Tubular Lock Comparison 2026: Four Families, Every Series, and What Heavy Duty Actually Changes
- Exit Device Comparison 2026: Every Push Bar in the Range by Length, Latching and Door
- Mortise Lock Case Comparison 2026: Every Published Backset and Center Distance, Side by Side
- Backset and Door Thickness Chart 2026: What 589 Published Models Actually Take
- Brass Hardware 2026: Which Brass, Why Lead Is In It, and the One Failure Mode That Decides Coastal Projects
- Validating a Hardware Certificate 2026: The Seven Parts, DoP and CE Marking, and the Six Red Flags
- Chrome, Satin Chrome and Satin Nickel 2026: Why Two Suppliers' "Polished Chrome" Do Not Match, and How to Specify One That Does
- Lock Function Selection 2026: A Decision Table by Room Type, and the Two Questions That Settle Every Opening
- Container Loading for Door Hardware 2026: Why a 40HQ Does Not Hold More Than a 40GP
- Corrosion Resistance 2026: EN 1670 Grades 0–5, Salt Spray Hours, and What the Test Does Not Tell You
- 200,000 Cycles: What a Durability Figure Means in EN 1906 and in ANSI/BHMA, and Why It Is Not the Same Number
- Dimensional Interchangeability 2026: The Seven Dimensions That Decide Whether a Lock Drops In, and How Many We Publish
- Door Closer Mounting 2026: Regular Arm, Top Jamb, Parallel Arm and Slide Track Compared
- Door Closer Power Size 2026: EN 1154 Sizes 1–7, A156.4, and How to Pick One from the Door
- Door Hardware HS Codes 2026: Headings 8301 and 8302 Decoded, and Where the Six Digits Stop
- Door Preparation 2026: The 161 Bore, the 86 Mortise Pocket, and What "Prepped For" Actually Guarantees
- Door Thickness to Cylinder Length 2026: The Arithmetic, a Lookup Table, and Why the Answer Is Often Rounded Up
- EN 1125 or EN 179 in 2026: Panic Bar or Emergency Lever, and the One Question About People That Decides It
- EN to ANSI/BHMA Cross-Reference 2026: What Maps, What Does Not, and Why
- Euro Cylinder Size Chart 2026: Every Length and Split, and How to Measure Yours
- Exit Device Outside Trim 2026: Every Trim Function Compared, Dogging Rules, and Why the Bar Is Never the Decision
- Finish Code Reference 2026: The 23 Codes, the BHMA Numbers, and the Four Pairs That Reverse
- Fire Door Hardware 2026: Which Components Must Be Rated, EN 1634-1 vs UL 10C and NFPA 252, and What a Certificate Covers
- Glass Door Hardware 2026: Thickness Ranges, Cut-Out Dimensions, and the One Step That Cannot Be Undone
- Door Hardware Refurbishment Survey 2026: The Fourteen Fields, What Needs a Screwdriver, and How to Sample a Building You Cannot Fully Open
- Door Hardware Warranty 2026: What "Ten Year" Actually Covers, the Five Exclusions That Do the Work, and How to Make a Claim Succeed
- Hinge Grades and Hinge Count 2026: EN 1935 Grades 1–14, ANSI/BHMA A156.1, and How Many a Door Needs
- Key Blanks and Restricted Profiles 2026: Open, Restricted and Patented Keyways, and What Key Control Actually Buys
- Lever Return and EN 1906 2026: Why a Lever Must Curve Back, and What the Eight-Digit Classification Says
- Master Key Hierarchy Planning 2026: The Levels, What Cross-Keying Really Costs, and How to Leave Room for the Building You Will Have
- Material Traceability 2026: EN 10204 Types 2.1, 2.2, 3.1 and 3.2, Heat Numbers, and What a Hardware Factory Can Honestly Trace
- Powder Coating and RAL 2026: Why a Color Number Does Not Specify a Finish, What Pretreatment Decides, and What to Write on the Order
- Qualifying a Hardware Supplier 2026: Factory, Trader or Broker, the Five Questions That Separate Them, and What to Verify
- Samples and Incoming Inspection 2026: The Golden Sample, What to Measure, and What a Sample Cannot Tell You
- Writing Door Hardware Section 08 71 00 in 2026: The Three Parts, What Belongs in Each, and the Clauses That Cost Money
- Door Handle Spindle Sizes 2026: 8mm and 9mm Squares, Split Spindles, and How to Calculate the Length
- Stainless Grade Selection 2026: 201 vs 304 vs 316, What Each Costs, and Why "304/201" on a Spec Sheet Is the Real Problem
- Strike Plates and Keeps 2026: ANSI Strike vs T-Strike, Lip Length, and the Dimension Nobody Measures
- Door Hardware Submittal Package 2026: Every Document the Reviewer Needs, and the Four That Get It Rejected
- Door Hardware Drawings 2026: PDF, DWG, STEP and BIM Compared, and What a Factory Can Actually Give You
- Universal or Handed 2026: Which Hardware Is Reversible, Which Is Not, and the Four Products That Catch Projects Out
- Zinc Alloy Hardware 2026: What Zamak Actually Is, Where It Belongs, and the Four Ways a Bad Casting Fails
News (75)
- Door Closer Size Chart: EN 1154 Sizes 1 to 7 by Door Width and Weight
- Door Handing Chart: LH, RH, LHR, RHR and DIN Left or Right
- Door Lock Measurement Sheet: What to Measure Before You Order
- Master Keying a Campus: How a 5,000-Opening System Is Structured
- Top Pivots and Top Patches: What Holds the Top of a Floor-Spring Door
- Latch Guards, Cylinder Protectors and Security Hinges: Three Anti-Pry Parts
- Panic Bars for Glass Doors: Through-Bolted or VHB Tape, and Glass Thickness
- Barrel Bolts, Slide Bolts and Spring Latches: Which Surface Bolt for Which Door
- Double-Bit (Doble Paleta) Lock or Euro Cylinder: Which for an Entrance Door
- Door Guard or Door Chain: What a Swing-Bar Guard Does Differently
- Left or Right Opening Door in Brazil: Reading Abertura Direita and Esquerda
- Door Viewers: Door Thickness Range, Barrel Diameter and Viewing Angle
- Double-Action Doors: Spring Hinge or Floor Spring
- How to Read EN Classification Codes Digit by Digit: EN 1906, EN 12209, EN 1154, EN 1935 and EN 1303
- How a Euro Profile Cylinder Is Built: Body, Plug, Pins, Springs and Cam (Profilzylinder Aufbau)
- Key and Thumbturn Euro Cylinders: Which Side the Turn Goes, and How to Split the Length
- Fail-Safe vs Fail-Secure Electric Locks: What Happens When the Power Goes, and How to Specify It
- Floor Springs for Glass Doors: Door Weight, Door Width and EN 1154 Size
- Glass Door Pull Handles: Center Distance, Standoff, Tube Size and the Glass Hole
- Grab Bars and Fold-Down Shower Seats: Diameter, Wall Clearance and Length, and What Accessibility Codes Measure
- Grip Handle Sets: What the Thumb Latch, the Deadbolt and the 60/70 Backset Have to Agree On
- Durability Numbers on Institutional Door Hardware: How to Read Cycle Tests and Grades
- Lever on a Rose or on a Backplate: What the Door Decides
- Master Key Chart: How to Read and Draw One, With a Worked Example
- Mortise, Euro Profile or Rim Cylinder: Which One Your Lock Takes
- Parts of a Mortise Lock: Case, Forend, Latch, Deadbolt, Follower and Strike, Labeled
- Multipoint Locks: What to Measure, from Backset to Hook Positions
- NBR 11785 vs EN 1125: What Changes for a Panic Bar in Brazil
- Panic Hardware Types: EN 1125 Panic Bars, EN 179 Emergency Exit Devices and Panic Locks
- Reading a Butt Hinge Size: 4 × 3 × 2.5mm, and How to Measure the One You Are Replacing
- Replacing a Tubular Latch: 60/70 Adjustable or 90mm Backset, and Which Lock It Fits
- Rim Locks on Steel Doors and Gates: Welded or Screwed, and the Double Cylinder
- Sliding Door Locks: Why the Bolt Is a Hook (Hakenriegelschloss)
- Spring Hinges: Self-Closing Without an Overhead Closer, Tension Adjustment, and Where It Is Not Enough
- Stainless Washroom Accessories: Hooks, Roll Holders, Shelves and Dispensers, Room by Room
- Fire Rated Door Knobs and Levers: The Rating Is in the Latch, Not the Knob
- FB001 and FB005 Flush Bolts: Which Type, Which Length, Which Leaf
- How to Write a Keying Schedule, With a Blank Template
- Satin Chrome vs Satin Nickel: US26D/626 or US15/619, and How to Choose
- Why Every Key Bitting Must Be Unique: The Security Floor of a Master Key System
- NBR 11742 and NBR 11785: What a Brazilian Inspection Checks on Fire Door Hardware
- One Opening, One Order: The Hardware Set for a Double Fire Exit Door
- A Brass Piano Hinge Is Usually Not Brass
- Entrance, Privacy, Passage: Choosing Between Twelve Cylindrical Locks
- A 25mm Throw and a Collar That Spins: Deadbolts D101 and D102
- 45 to 90: Reading Our Euro Cylinder Range
- 650 to 1200mm: Which Push Bar Length Your Door Takes
- US26D, 626, 630: A Finish Code Is Not a Color
- 200,000 Cycles: What the LH Lever Range Is Actually Rated For
- Occupied or Vacant: What a Washroom Indicator Actually Has to Do
- The Rim Night Latch: What 564 and 1073 Actually Measure
- Lever Length, Rose Diameter, Projection: The Stainless 9000 Levers
- UL 305 Is a Listing, Not a Grade
- A Padlock Chained to a Knight in Germany
- Fitting a Euro Cylinder: Five Steps, and the Two Everyone Skips
- Why a Double Fire Door Needs a Coordinator, and How to Size One
- Which Exit Device Standard Your Project Is Actually Under
- How Many Levels Your Master Key System Actually Needs
- Cross-Referencing a Lock You Already Buy
- DS013 vs DS011: a Door Stop, a Cabinet Catch, and Why a Stop Is Not a Flush Bolt
- Cutsheets, CAD and BIM: What We Have and What We Do Not
- 70 Is the Total, Not the Split
- A Test Report Covers a Model, Not a Range
- What OEM Actually Changes, and What It Does Not
- Handing: The One-Letter Answer That Holds Up Orders
- The Six Values a Hardware Order Actually Needs
- Trim Handle or Panic Bar: What the Outside of a Fire Exit Door Needs
- ANSI Grade 1 or EN 1125: Which Standard Your Exit Device Has to Meet
- Why Aluminum Doors Drop, and What the Lock Case Has to Do With It
- Push Bar or Touch Bar: Which Panic Device Your Door Needs
- 304, 201 or 316: Which Stainless Steel You Are Actually Buying
- What One Frameless Glass Door Actually Needs
- The Door Schedule: How Hardware Is Actually Specified
- Backset and Center Distance: How to Read a Mortise Lock Case Number
- What the Letters After a Model Number Mean