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ASME B107.42M-1997 (2004) — Hatchets: Safety Requirements
🪓 ASME B107.42M-1997 (2004) is the ASME B107 safety standard for hatchets, descended from ANSI/HTI B173.7-1990 and developed with technical representatives of the Hand Tools Institute Striking/Struck Tools Standards Committee. It sets safety requirements for the design, construction, testing, and use of hatchets. A hatchet has a striking face on one end of the head for driving common (unhardened) nails and/or striking wood products, and a blade or bit on the opposite end for cutting, notching, and shaping wood or wallboard products, cutting spacing and aligning soft roofing products, and — where a nail slot is provided — pulling common nails.
💡 A hatchet is a hammer and a blade in one head: the striking face and the cutting edge sit at opposite ends. B107.42M brings both functions under safety control through steel chemistry, chamfer geometry, hardness, and static/striking tests.
1. Positioning and Technical Language 📌
Section 1 (General) states the Standard’s role as a guide to selecting, testing, and using hatchets; Section 3 defines the key parts — striking face, bell, neck, poll, crown, chamfer, cutting edge, bit, eye, handle, nail slot, safety message, and more — so that the subsequent requirements are interpreted consistently.
| Part | Definition | Related Safety Clause |
|---|---|---|
| Striking face | The striking portion opposite the bit, exclusive of bell, neck, poll, and chamfer | Smooth or serrated; convex or flat |
| Chamfer | Approximate 45-deg bevel or equivalent radius around the striking-face perimeter | Width about one-tenth of bell/poll diameter |
| Cutting edge | The sharpened edge formed by the bit | Edge geometry and sharpness |
| Nail slot | V-shaped opening in a noncutting edge of the bit | Nail-pulling function |
| Head and handle | Free of burrs, sharp edges, roughness; handle validated by test | Seams, laps, cold shuts prohibited |
2. Head Material and Chemistry 🔧
Para. 4.2 requires hatchet heads to be made from special-quality, fine-grain, hot-rolled carbon steel bars conforming to the chemical requirements of Table 1 and to ASTM A 29/A 29M or A 576 (or an equivalent material). Heads shall be free of manufacturing and material defects that jeopardize sound construction — seams, laps, pipes, and cold shuts. The material must also meet the mechanical property requirements of para. 4.3 and withstand the striking test of para. 4.4.3.
⚠️ Head steel chemistry governs the hardness-toughness balance after hardening: too little carbon and the face dents; too much and it becomes brittle and chips. At acceptance, verify the material test certificate (MTC) and heat number, and re-check chemistry if in doubt.
3. Design and Test Requirements 🧪
Para. 4.1 requires: the striking face shall have a smooth or serrated surface and a convex or flat shape; the striking-face perimeter shall carry an approximate 45-deg chamfer (or equivalent radius) whose width is about one-tenth of the bell or poll diameter — e.g., a 1.00 in (25.4 mm) bell/poll diameter corresponds to a chamfer width of about 0.100 in (2.54 mm); for square or rectangular striking faces, the chamfer width is about one-tenth of the lesser dimension. Handles may be of any design, including ergonomic, provided they withstand the tests of paras. 4.4.3 and 4.4.4; the head and handle shall be free of nonfunctional sharp edges, points, and surface roughness.
- Static Force Test: applies loads to the head per the typical arrangement of Fig. 2 to verify head-to-handle connection strength and head deformation.
- Striking Test: repeated blows in the prescribed manner verify the head neither cracks nor separates.
✅ Acceptance criteria: after testing, no cracks, separation, or significant deformation affecting safe use. Records should cite the test clauses, loading parameters, and sample counts.
4. Safety Requirements and Limitations of Use 🚧
Section 5 requires: wear eye protection per ANSI Z87.1 when working; mark products with safety messages per ANSI Z535.4; use a hatchet only for driving/pulling unhardened nails, cutting/notching wood and wallboard, and working soft roofing products; do not chop hard metals or use it beyond its design purpose; retire the tool at the first sign of head cracks, chipped edges, or a loose handle.
🚨 A hatchet is a scaled-down chopping tool — short swing radius but concentrated force. Confirm no one is in the swing path, and always set the edge down or sheath it to prevent accidental contact injuries.
5. Engineering Practice Essentials 🛠️
- 🔍 Choose by task: general carpentry favors a model with a nail slot; roofing work favors a shingle/soft-roof hatchet; light dressing favors models with a marking gauge.
- 🔧 Edge care: sharpen at the original edge angle with an oil stone or fine grinder, keeping the edge keen; avoid heavy grinding that anneals the edge.
- 📊 Face inspection: periodically check the face chamfer and crown; stop using when the chamfer is gone or the face is dented.
- 📋 Procurement and acceptance: request B107.42M-conforming chemistry evidence (Table 1) and static/striking test reports; verify markings.
6. Frequently Asked Questions ❓
❓ Q: How do B107.42M and B107.400 relate?
A: B107.400-2018 incorporates hatchets and axes as Category 42; this article addresses the B107.42M-1997 (2004) standalone edition, whose hatchet clauses agree with the consolidated standard.
A: B107.400-2018 incorporates hatchets and axes as Category 42; this article addresses the B107.42M-1997 (2004) standalone edition, whose hatchet clauses agree with the consolidated standard.
❓ Q: Why is the chamfer width written as “one-tenth of the diameter”?
A: A chamfer proportional to face size works for both small and large hatchets: a 1.00 in (25.4 mm) bell/poll diameter corresponds to about 0.100 in (2.54 mm) of chamfer; an undersized chamfer does not prevent edge spalling.
A: A chamfer proportional to face size works for both small and large hatchets: a 1.00 in (25.4 mm) bell/poll diameter corresponds to about 0.100 in (2.54 mm) of chamfer; an undersized chamfer does not prevent edge spalling.
🔍 Q: How hard should a hatchet edge be?
A: The Standard does not set a single hardness value; it relies on chemistry, heat treatment, and the striking test together to ensure “hard enough, not brittle.” In practice the edge is somewhat softer than a cold chisel, trading a little wear resistance for chip resistance.
A: The Standard does not set a single hardness value; it relies on chemistry, heat treatment, and the striking test together to ensure “hard enough, not brittle.” In practice the edge is somewhat softer than a cold chisel, trading a little wear resistance for chip resistance.
❓ Q: What does the 2004 reaffirmation mean?
A: The committee reviewed the 1997 edition and found its requirements still valid without technical revision; the edition remains current until a new revision is published.
A: The committee reviewed the 1997 edition and found its requirements still valid without technical revision; the edition remains current until a new revision is published.
