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ASME B107.44-2002 — Glaziers’ Chisels and Wood Chisels
🔪 ASME B107.44-2002 is the dedicated ASME B107 standard for glaziers’ chisels and wood chisels, descended from ANSI/HTI B209.6-1990 and continued by the B209 committee after its merger into B107. It provides performance and safety requirements for these tools, serving as a guide to selecting, testing, and using them, and as a basis for training manuals, posters, and safe-work instruction. Manufacturing details are deliberately left open, and the Standard may be referenced by regulators. Consistent with the B107 series, this edition’s principal change is the allowance of any material that meets the performance and safety requirements for the chisel body.
💡 A chisel is the intermediary that carries hammer energy to a cutting edge. The critical safety parameters are: a struck end that does not spall (chamfer plus hardness), a body that does not break (side force test), and an edge that neither rolls nor chips (edge heat treatment plus impact test).
1. Scope and Product Positioning 📌
Section 1 covers glaziers’ chisels and wood chisels. Glaziers’ chisels are used in glazing work to clean and dress wooden frames and rebates; wood chisels (including all-steel wood chisels) are used for mortising, grooving, and surface dressing in woodwork. The Standard serves as a guide for selecting, testing, and using these tools and as a basis for safety manuals and training.
⚠️ A chisel is a cutting struck tool — not a pry bar and not a cold chisel: never use a wood chisel to pry hard objects, strike metal, or act as a screwdriver. Doing so chips the edge, bends the body, and can shatter the struck end.
2. Structure and Terminology 📐
Section 3 defines the terms with Figures 1–3 (nomenclature for glaziers’ chisels, all-steel wood chisels, and wood chisels). Shared terms include:
| Term | Definition | Safety Significance |
|---|---|---|
| Struck face | The end that receives hammer blows | Chamfer to prevent spalling; moderate hardness |
| Chamfer | Angled flat surface or equivalent radius between the struck face and the body, encircling the struck-face perimeter | Reduces edge breakage and flying chips |
| Blade | The portion opposite the struck face, used for cutting | Cutting stiffness |
| Body | The metal portion extending from the blade | Overall strength |
| Bevel | The angular or curved portion adjacent to the cutting edge | Edge geometry and cutting efficiency |
| Cutting edge | The edge formed by the bevel directly opposite the struck face | Sharpness and chip resistance |
| Handle | The part attached to the body for holding | Joint strength (all-steel chisels are one-piece) |
All-steel wood chisels are one-piece designs whose handle end can take hammer blows directly (including alternate upset-head designs); handled wood chisels with wooden or composite handles must validate joint strength through the prescribed tests.
3. Material and Performance Requirements 🔧
Section 4 requires: the body may be made of any material that meets the performance and safety requirements (this edition’s core change); the struck face shall be heat-treated to the specified hardness range and carry a chamfer or equivalent radius; the body shall be free of cracks, laminations, and other safety-affecting defects; the cutting edge shall maintain the specified edge angle with adequate sharpness and chip resistance; and hardness is determined per ASTM E18 Rockwell methods.
⚠️ The hardness-toughness balance at the edge is the heart of chisel performance: too hard and the edge chips; too soft and it rolls. Sample-check struck-face and edge hardness per ASTM E18 at acceptance and visually inspect the chamfer and edge.
4. Test Methods 🧪
Section 5 defines two core tests:
- Side Force Test (Fig. 4): applies lateral loads to the blade of glaziers’ and wood chisels to verify bending resistance under prying/off-axis conditions and the strength of the body-to-handle joint.
- Impact Test (Fig. 5): repeated blows at prescribed energy against the struck end, with the standard dowel-pin grain orientation (Fig. 5, Impact Test Dowel Pin Grain Orientation), verifying the struck end and body resist cracking and chipping under impact.
✅ Acceptance criteria: after testing, no cracks, fractures, chipped edges, or significant deformation affecting safe use. Records should state the test clause, loading parameters, dowel-pin grain orientation, and sample count.
5. Safety Requirements and Engineering Practice 🛠️
Section 6 requires: wear eye protection per ANSI Z87.1 when working; mark products with safety messages per ANSI Z535.4; use chisels with suitable striking tools and strike the center of the struck face; and retire the tool at the first sign of a mushroomed struck end, a cracked body, or a chipped edge.
- 🔍 Match the type: glaziers’ chisels for glazing work; handled wood chisels for mortising and grooving; all-steel wood chisels for heavier dressing (one-piece construction resists blows better).
- 🔧 Edge maintenance: hone at the original edge angle with an oil stone to keep it keen; never “free-hand grind” on a high-speed wheel and anneal the edge.
- 📊 Struck-end care: dress mushroomed burrs behind a guard and keep the chamfer intact.
- 📋 Procurement and acceptance: request B107.44 side force and impact test reports plus hardness data, and verify markings.
🚨 Common chisel injuries are “hammer slip → struck-end chips in the eye” and “off-axis loading → body fracture”. Always use a hammer matched to the chisel size, aim at the center of the struck face, and keep hands clear of the cutting edge.
6. Frequently Asked Questions ❓
❓ Q: How do B107.44 and B107.410 relate?
A: B107.410-2018 (Struck Tools) lists glaziers’ chisels and wood chisels as Category 44; this article addresses the B107.44-2002 standalone edition, whose chisel clauses agree with the consolidated standard.
A: B107.410-2018 (Struck Tools) lists glaziers’ chisels and wood chisels as Category 44; this article addresses the B107.44-2002 standalone edition, whose chisel clauses agree with the consolidated standard.
❓ Q: Why does this edition allow “any material that meets the requirements”?
A: As elsewhere in the B107 series, the focus shifts from prescribing materials to prescribing performance: any body that passes the side force and impact tests and meets the hardness requirements is acceptable, leaving room for alloy steels and new heat treatments.
A: As elsewhere in the B107 series, the focus shifts from prescribing materials to prescribing performance: any body that passes the side force and impact tests and meets the hardness requirements is acceptable, leaving room for alloy steels and new heat treatments.
🔍 Q: Why does the impact test specify the dowel-pin grain orientation?
A: Grain orientation changes the stiffness and energy absorption of the backing block, which affects test results; specifying the grain direction (Fig. 5) is the key detail that makes the test reproducible.
A: Grain orientation changes the stiffness and energy absorption of the backing block, which affects test results; specifying the grain direction (Fig. 5) is the key detail that makes the test reproducible.
❓ Q: All-steel or handled wood chisel — which should I choose?
A: Choose one-piece all-steel for hammer-driven durability (the handle end takes blows directly); choose handled wood chisels for fine cutting feel and lighter weight, but validate the handle joint per the Standard and never use it as a striking tool.
A: Choose one-piece all-steel for hammer-driven durability (the handle end takes blows directly); choose handled wood chisels for fine cutting feel and lighter weight, but validate the handle joint per the Standard and never use it as a striking tool.
