400 Spine Arrows: 45–60 lb All-Rounder Buyer's Guide

What Are 400 Spine Arrows?

A 400 spine arrow is a shaft that measures 0.400 inches of deflection on the standard AMO static spine test — a 26-inch span of raw shaft supported at both ends, loaded with a 1.94 lb weight at center, bending exactly 0.400″. Lower numbers mean stiffer shafts (a 340 bends 0.340″, a 500 bends 0.500″), and the 400 grade sits one step softer than the 340 that big-draw hunting bows use, and one step stiffer than the 500 that light bows and short draws need. In practice, that puts 400 spine arrows at the exact center of the archery market: the 45–60 lb compound draw-weight band and the 40–55 lb recurve band, which is where the majority of adult bows are sold. When you browse 400 spine arrow shafts at any retailer, you are looking at the deepest-stocked, cheapest-per-dozen, most model-diverse grade in carbon — every manufacturer’s core hunting and target line includes a 400, from house-brand 400 spine carbon arrows to match-grade micro-diameter tournament shafts.

The phrase carbon arrows 400 spine dominates search because carbon is now effectively the only game in town for this grade. Aluminum shafts in the equivalent stiffness (a 2016 or 2018 XX75-class tube) still exist for indoor lines, but a carbon 400 gives you more spine-per-grain, better durability per dollar, and far wider component choice — inserts, outserts, and micro-diameter broadhead systems are all designed around carbon diameters first. Carbon also holds its spine over time: an aluminum shaft bends permanently when it takes a hard hit, quietly going softer, while a carbon shaft either survives or visibly fails. That predictability is why every chart, calculator, and tuning method on this site assumes the carbon spine scale.

The Number on the Shaft: Deflection, GPI, and Straightness

Three numbers describe any 400 spine shaft, and buyers who conflate them buy wrong. Spine (400) is stiffness — 0.400″ deflection, fixed by wall thickness and diameter. GPI (grains per inch) is weight — a 400-grade carbon runs roughly 8.0–11.0 GPI depending on construction, so the same-stiffness shaft can finish anywhere from about 355 to 440 grains at a 28″ cut with a 100 gr head. Straightness is manufacturing tolerance — budget shafts run ±.006″, mid-tier ±.003″, premium ±.001″. None of the three substitutes for another: you cannot fix a stiffness mismatch with weight, and straightness tolerance does not change how a shaft flexes around the riser. Match spine first (the checker above), then choose GPI for your weight target, then pay for straightness only if your accuracy demands it.

Where 400 Sits in the Carbon Spine Ladder

The consumer carbon ladder runs 300 → 340 → 400 → 500 → 600 and beyond, each step about 10 lb of compound draw weight apart at a 29″ arrow and 100 gr point. The 340 grade serves 65–70 lb bows and heavy-front elk builds; the 400 serves 45–60 lb compounds and 50–55 lb recurves; the 500 serves 35–45 lb compounds and 40–45 lb recurves; the 600 and below serve youth and traditional-light bows. The Arrow Spine Chart lays out every brand’s published table side by side, and the Arrow Spine Comparison guide explains how the same bow can legally land on two different grades depending on arrow length and front weight. That boundary behavior — where one grade ends and the next begins — is the entire subject of this page, because 400’s boundaries are the widest-traveled in archery.

The 400 Spine Draw Weight Window

Ask ten manufacturers for the 400 spine arrow draw weight and you will get four different tables — but they all overlap on one honest window. For a compound with a mechanical release, a 27–29″ arrow and a 100 gr point, 400 is the correct grade from roughly 45 lb up to 60 lb, with the 50–58 lb middle being the dead-center sweet spot where every published chart agrees. The edges are graded, not cliffed: a 45–48 lb setup drifts toward the 500 boundary as draw length shortens, and a 60–65 lb setup drifts toward the 340 boundary as draw length or point weight grows. For recurve and traditional shooters the window shifts up — finger release softens the arrow roughly half a grade — so the same 400 serves a 40–55 lb recurve across typical arrow lengths, centered on 50–55 lb.

The two correction variables that move you inside the window are the ones the fit checker above manipulates: arrow length and front weight. Every inch of added arrow length softens dynamic spine by about half a grade, and every 50 grains of added point weight does the same. A 55 lb compound at a 28″ draw with a 100 gr field point is a textbook 400; the same bow at a 30″ draw with a 150 gr broadhead is a 340 candidate; the same bow at a 26″ draw with an 80 gr target point is a 500 candidate. Same bow, three grades — which is why “what spine for 55 lb?” has no single answer, only a window and corrections.

Arrow Spine for 50 lb Compound

Fifty pounds is the most-asked single number in the 400 grade, and the answer is a two-variable decision. A 50 lb compound at a 28–29″ draw with a 100 gr point is a 400 — the published charts converge there, and the fit checker returns “400 fits” across that whole input band. Drop the draw length to 26–27″ or the point to 75–85 gr and the same 50 lb bow drifts onto the 400/500 boundary: the arrow acts stiff because shorter-and-lighter arrows flex less, so a 500 tests better. Push instead — a 30″ draw or a 125–150 gr broadhead on 50 lb — and you drift toward the 400/340 boundary, where a 400 on the soft edge still works but a test shaft is the honest move. The practical rule for 50 lb shooters: buy 400 when arrow length is 27″ or more with a 100 gr head, and verify with one paper-tuned shaft before cutting a dozen. If you are tuning a 50 lb build for total weight and FOC rather than spine, the Arrow Weight Calculator handles the grain stack.

Recurve and Traditional Shooters: The 40–55 lb Window

Finger release changes the math. Letting the string roll off three fingers (versus a mechanical release) softens the arrow’s dynamic bend by roughly half a grade, so a recurve needs about the stiffness a compound of 5–10 lb more draw weight would need. That is why the arrow spine for 50 lb recurve shooters is a 400 — the same grade a 55–60 lb compound wants — and the arrow spine for 55 lb recurve bows is also 400, staying there until the arrow runs past 29″ or the front weight climbs past 150 gr, where 340 enters the conversation. The 40–55 lb recurve window this page is built around therefore splits into two buyers: 50–55 lb shooters are the 400 core, while 40–45 lb shooters sit on the 400/500 boundary and should let arrow length break the tie — 26–27″ arrows with 125 gr points keep 400 viable, 28″+ arrows with light points belong on 500. The 500 spine arrows page covers that softer grade in the same depth.

When a 60 or 70 Pound Bow Still Shoots 400

A 400 spine arrow on a 60 pound bow is not an exception — it is the definition of the grade. The 400 baseline was calibrated on exactly that bow: 60 lb, 29″ draw, 100 gr point, moderate cam. A 60 lb shooter stays on 400 through most real-world variations: 28–30″ arrows, 100–125 gr heads, both cam styles. The grade only breaks at the extremes — a 31″+ draw, a 150 gr+ broadhead, or an aggressive cam stacked together push a 60 lb bow onto the 340 boundary, and a 26″ draw with an 80 gr target point pushes it onto the 500 boundary. Between those extremes, the 60 lb / 400 pairing is the single most-published recommendation in archery, which is precisely why so many archers wrongly assume it generalizes upward.

A 400 spine arrow on a 70 pound bow is a different story, and it is the most common spine mistake in retail archery. At 70 lb, a 29″ draw and a 100 gr point, the correct grade is 340 — one full step stiffer, confirmed by every major published chart. A 400 on that bow over-flexes: paper tears go tail-left, broadheads plane, and field points group apart from hunting heads. Does a 70 lb bow ever shoot 400? Only when the arrow is shortened well below the draw-length norm or the front weight stays light — a 26″ cut with a 100 gr field point on a mild cam is a borderline test-shaft case, and even there 340 is the safer purchase. Every direction a 70 lb setup can move (longer draw, heavier head, harder cam) points further from 400, not toward it. If your bow is 70 lb, the answer is 340; the fit checker above will tell you the same thing with the sliders set to your real numbers.

The 28-Inch Cut Effect: 28 Inch 400 Spine Arrows

28 inch 400 spine arrows are the best-selling configuration in the grade, and the reason is arithmetic rather than marketing. The average adult male draw length lands between 27.5″ and 28.5″, and arrows are cut roughly 1–1.5″ ahead of the rest — so a 28″ arrow is what a 28″-draw shooter actually buys. At that cut, a standard-wall 400 (≈ 8.6 GPI) weighs about 240 grains bare and finishes near 370 grains with a 100 gr head and standard hardware: fast enough for flat 30-yard pins, heavy enough for deer, light enough that a 50 lb bow drives it cleanly. Spine-wise, 28″ sits one half-gradestiffer than the 29″ reference — which is why the 400 window extends lower (45 lb) for 28″ shooters than the raw draw-weight table suggests.

The cut effect runs in both directions, and it compounds with everything else. Cutting to 26″ makes the arrow a full grade stiffer in behavior — a 55 lb bow on 26″ 400s is over-spined into 500 territory. Letting the arrow run to 30″ does the opposite: the same 400 behaves half a grade softer, which is exactly how a 60 lb bow with a 150 gr elk head comes back into tune on 400 instead of 340. This is the single most under-used tuning lever buyers ignore: arrow length is a spine adjustment you can make with a saw. Buy the longest shaft your setup allows, tune the length on paper, then cut the dozen to the length that tears cleanest.

400 Spine Arrows for Recurve and Traditional Bows

400 spine arrows for recurve shooters occupy the forgiving middle of the traditional market. A 50–55 lb recurve with a 27–29″ arrow and a 100–125 gr point is squarely a 400 bow, and the grade tolerates the things finger release does to an arrow — slight torque, inconsistent follow-through, off-the-shelf rests — better than either neighbor. 400 spine traditional arrows for longbow and horse-bow shooters follow the same logic at slightly lower poundage: 45–50 lb longbows on 27″ arrows shoot 400 well, especially with the heavier 125–145 gr cut-on-contact heads traditional hunters favor, because the added front weight offsets the shorter cut. Screw-in field points or glue-in tapered heads both exist in 400-compatible weights, and classic carbon traditional lines (Easton Carbon One, Carbon Express Maxima Blue Select, Black Eagle Traditional) all stock the grade.

Two setup details matter more for traditional shooters than for compound hunters. First, point weight is your primary tuning dial: traditional risers are cut past center less aggressively, so moving between 100, 125, and 150 gr heads is often enough to bring a borderline 400 into tune without touching length. Second, feather fletching and larger vanes add drag that exaggerates a weak arrow’s porpoising — if a 400 tears tail-left on your recurve at 20 yards, it will look twice as bad at 40. Traditional shooters buying their first carbon dozen should also plan on the bare-shaft tuning method: shoot one unfletched shaft alongside fletched ones at 10–15 yards and match impact points before committing the rest of the dozen.

Target vs Hunting: Two Builds From the Same 400 Shaft

The same 400 spine shaft builds into two very different arrows, and the split is deliberate. A target build chases flat trajectory and tight groups: light 75–100 gr points, the lightest GPI the line offers (≈ 8.0–8.4), full-length or near-full cut, and small vanes. A 28″ target 400 finishes around 340–360 grains, keeps pin gaps tight, and — on a 50–55 lb bow — still sits inside the 400 window because the light front offsets nothing. A hunting build chases momentum and broadhead steering: 100–150 gr heads, standard or heavy-GPI shafts (≈ 8.6–11.0), and often a shorter cut for clearance. The same bow can legally need a 400 for the target arrow and a 340 for the heavy-hunting arrow, because 50 grains of extra front weight is half a grade of softness — that is not a contradiction, it is the correction table working as designed.

The practical buying advice: decide which job dominates before choosing your model inside the 400 grade. If you shoot 3D and summer leagues, prioritize the speed builds and straightness tolerance. If you hunt, prioritize wall thickness and broadhead-insert systems, and accept the 15–25 fps you donate to mass. Shooters who do both from one bow should buy two matched sets — one tuned target dozen, one tuned hunting dozen — rather than a compromise dozen that serves neither, and run the hunting set’s weight stack through the Arrow Weight Calculator before ordering points.

Budget vs Premium 400 Spine Shafts

The 400 grade is where every price tier lives, because every manufacturer’s volume line includes it. The honest differences between a $60 dozen and a $200 dozen are not spine accuracy — a budget 400 and a premium 400 both deflect 0.400″ — but tolerance and consistency: straightness (±.006″ vs ±.001″), weight-to-weight matching across the dozen (±2 gr vs ±0.5 gr), and wall-thickness uniformity that shows up after a season of hard impacts. For backyard practice and light-duty hunting, the budget tier is genuinely sufficient. For serious hunting or competition, the premium tier buys you a dozen that behaves like one arrow instead of twelve individuals. All figures below are manufacturer-published nominal values (≈, ±0.2 by production year) — confirm the current spec sheet before ordering.

How to read the table: finished weights assume a 28″ cut, 100 gr point, and ≈ 25 gr of nock, insert, and fletching hardware. The premium tier’s Easton FMJ 400 is the outlier — its aluminum jacket adds roughly 65 grains over a same-stiffness carbon, converting the 400 grade into a 430+ grain hunting arrow without changing spine. The mid tier is where most 45–60 lb buyers should land: Easton 6.5 or Gold Tip Hunter tolerances are tight enough to tune, and the price leaves budget for good broadheads. The budget tier’s honest role is practice volume — buy them in bulk, expect a few outliers per dozen, and spin-test every shaft before fletching.

The Lightest 400 Spine Arrows

If your goal is the lightest 400 spine arrow — flat trajectory, minimal pin-gap change, maximum speed retention — the micro-diameter speed builds are the answer. The Victory VAP 400 (≈ 8.2 GPI, manufacturer-published nominal) finishes near 355 grains at a 28″ cut with a 100 gr head, and big-box house brands commonly run 8.0–8.4 GPI. Below about 8 GPI the class floor arrives: walls get too thin to reliably seat broadhead inserts and survive hard impacts, which is why no serious manufacturer lists a 400 lighter than ≈ 8.0. Know the trade — the light builds give up durability and front-of-center flexibility, so they suit 3D and western whitetail styles, while heavy-bone hunting wants the 8.6–11.0 GPI side of the table. And “lightest” only matters inside a correctly matched spine: a light, over-spined arrow is worse than a heavy, tuned one in every metric that hits the target.

How to Shop 400 Spine Arrows for Sale Like a Pro

Because 400 spine arrows for sale are everywhere — every big-box rack, every online clearance page, every pro-shop used bin — the risk is not availability but inconsistency. The buying checklist that separates a good dozen from a frustrating one: (1) the spine number must be printed on the shaft itself or its factory box, not inferred from a shelf tag or a seller’s listing title; (2) buy all twelve from one production batch — mixed batches can vary 3–5 grains shaft-to-shaft, which is enough to open groups at 40 yards; (3) check the straightness tolerance printed on the box matches the tier you paid for; (4) weigh one finished arrow on a grain scale and compare it to published GPI × cut length plus components — a batch more than ~5 grains off nominal is worth returning; (5) spin-test every shaft on glass or a flat table before fletching and cull anything that wobbles. Clearance 400s are fine for practice volume; a hunting dozen deserves full-price batch consistency.

Two ownership habits protect the investment. Never shoot a shaft that has taken a hard impact until it has been flex-checked and spin-tested — a cracked carbon shaft can fail on release, which is hard on the bow (a dry-fire-class event that usually is not covered under bow manufacturer warranty) and unsafe for the shooter. And re-check your arrows each season: aluminum goes soft quietly after hits, carbon either passes or visibly fails, and a five-minute inspection in March prevents a lost hunting arrow in October.

Frequently Asked Questions

From Diagnosis to Purchase: Your 400 Spine Workflow

Run the workflow in order and the 400 grade stops being a guess. Step one: set the fit checker at the top of this page to your real bow type, draw weight, draw length, point weight, and cam style, and read the four-step diagnosis — 400 fits, borderline, or a step to 340/500. Step two: if the verdict says borderline, buy one uncut shaft of each neighboring grade and paper-tune them; one afternoon settles what no chart can. Step three: pick your tier from the budget-vs-premium table based on the arrow’s job — practice volume, tuned hunting dozen, or competition tolerance. Step four: buy one batch, weigh and spin-test, build, and only then cut to your tuned length. The full model-by-model specification matrix for this grade — GPI tables, component compatibility, and per-model tolerances — lives on the 400 Spine Arrows guide, this page’s sister reference for buyers who have already confirmed their grade.

For the numbers behind every correction on this page, the Arrow Spine Calculator computes the full spine prediction from any input combination, and the homepage calculator hub puts the speed, weight, FOC, and trajectory tools one click away. When your draw weight sits below the 400 window, the 500 spine arrows page picks up the ladder from there — same methodology, one grade softer.